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Sample records for pomacea canaliculata gastropoda

  1. Pomacea canaliculata (Mollusca, Gastropoda) in Patagonia: potential role of climatic change in its dispersion and settlement / Pomacea canaliculata (Mollusca, Gastropoda) na Patagônia: o papel potencial da mudança climática em sua dispersão e estabelecimento

    Scientific Electronic Library Online (English)

    G., Darrigran; C., Damborenea; A., Tambussi.

    2011-02-01

    Full Text Available Pomacea canaliculata (Lamarck, 1822) (Mollusca Gastropoda) mostra um grande alcance de distribuição natural na América do Sul, chegando até os 37º S (Buenos Aires, Argentina). Esta espécie foi introduzida propositalmente no sudeste da Ásia, por volta de 1980 e, mais tarde, se submeteu a uma dispersã [...] o de forma rápida intencional ou acidental em muitos países da região. Também foi introduzido na América do Norte, América Central e Havaí. Nesta contribuição se confere a presença de P. canaliculata na Patagônia e se considera a influência das alterações climáticas no novo estabelecimento desta espécie no local referido. Três coletas (entre setembro de 2004 até abril de 2005) foram realizadas (38º 58' 20.2" S and 68º 11' 27.3" W). Nelas encontraram-se dois exemplares adultos de P. canaliculada e numerosas desovas. P. canaliculata distribui-se naturalmente nas regiões das Bacias do Prata e Amazonas. O limite sul desta espécie foi estabelecido nas isotermas de 14 ºC e 16 ºC na província de Buenos Aires, com precipitações de 900 a 600 mm. Também são analisadas as variações na temperatura anual e a precipitação na Patagônia. As médias de temperatura mostram um aumento no decorrer de dois anos. Modificações importantes no regime de precipitação no norte da Patagônia poderiam ser benéficas para o estabelecimento das populações de P. canaliculata nesta nova área, onde as precipitações aumentaram o suficiente até atingir os valores similares aos da região mais austral citada para a distribuição desta espécie. Abstract in english Pomacea canaliculata (Lamarck, 1822) (Mollusca Gastropoda) shows a large native distribution range in South America, reaching as far south as 37º S (Buenos Aires, Argentina). This species was deliberately introduced into Southeast Asia around 1980 and subsequently underwent a rapid intentional or ac [...] cidental dispersal into many countries in the region. It was also introduced into North and Central America and Hawaii. In this contribution we record the presence of P. canaliculata in Patagonia, assessing the possible influence of climatic change in the new establishment of this species there. Three samplings (between September 2004 and April 2005) were carried out at 38º 58' 20.2" S-68º 11' 27.3" W. In the sampling we found two adult specimens of P. canaliculata and numerous egg clutches. Pomacea canaliculata is naturally distributed in the Plata and Amazon Basins. The southern boundary of this species has been established as the isotherms of 14 ºC and 16 ºC in Buenos Aires province, and precipitations of 900 to 600 mm/year. This study also analysed variations in annual temperature and precipitation in Patagonia. Average temperatures show an increase over the years, although not constantly. Important modifications in precipitation regime in northern Patagonia, triggered by global climatic changes, could be beneficial for the settlement of populations of P. canaliculata in this new area, where precipitation increased enough to reach values similar to those in the southernmost area of distribution of this species.

  2. Anatomia e histologia do conduto genital feminino de Pomacea canaliculata (Lamarck, 1822) (Mollusca, Gastropoda, Pilidae)

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    Eliana de Fátima Marques de Mesquita; Arnaldo Campos dos Santos Coelho; Jefferson Andrade dos Santos

    1990-01-01

    In this paper the authors give an anatomical and histological analysis of the genital duct in mature and immature females of Pomacea canaliculata (Lamarck, 1822). Anatomically, the vagina has an equal dimension in its extension, varying in form and volume, according to the maturation period. In the immaturity, it has a smaller diameter and volume. In the maturity, the vagina increases in volume, having the aspect of a tumescent organ, and in certain specimens shows an albuminous pink thread i...

  3. Anatomia e histologia do aparelho reprodutor masculino de Pomacea canaliculata (Lamarck, 1822 (Mollusca, Gastropoda, Pilidae

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    Eliana de Fátima Marques de Mesquita

    1990-01-01

    Full Text Available In this paper the authors give an anatomical and histological analysis of the male reproductive system of Pomacea canaliculata (Lamarck, 1822. Anatomically, the testis is better evidentiated than the ovary. In the structure of the testis a great number of very small channels converges to a single one. The male copulatory organs result of transformations that take place in the inner surface on the palial membrane. Histologically, the testis of immature males shows seminiferous ducts with round egg-shaped forms. In their lumens we could notice masses of cells that will originate spermatozoids. The penis has a conjunctive muscular sheath that can be seen in van Gieson's coloured preparations.

  4. Anatomia e histologia do conduto genital feminino de Pomacea canaliculata (Lamarck, 1822) (Mollusca, Gastropoda, Pilidae)

    Scientific Electronic Library Online (English)

    Eliana de Fátima Marques de, Mesquita; Arnaldo Campos dos Santos, Coelho; Jefferson Andrade dos, Santos.

    Full Text Available [...] Abstract in english In this paper the authors give an anatomical and histological analysis of the genital duct in mature and immature females of Pomacea canaliculata (Lamarck, 1822). Anatomically, the vagina has an equal dimension in its extension, varying in form and volume, according to the maturation period. In the [...] immaturity, it has a smaller diameter and volume. In the maturity, the vagina increases in volume, having the aspect of a tumescent organ, and in certain specimens shows an albuminous pink thread in its lumen. Histologically, the calcigenic activity of the gland is evidentiated by the presence of an amorphous and basophilic mass, without nuclear material. This material has a fragmented aspect in the vagina lumen that reacts positively in van Kossa's coloured preparations for calcareous salts.

  5. Anatomia e histologia do conduto genital feminino de Pomacea canaliculata (Lamarck, 1822 (Mollusca, Gastropoda, Pilidae

    Directory of Open Access Journals (Sweden)

    Eliana de Fátima Marques de Mesquita

    1990-01-01

    Full Text Available In this paper the authors give an anatomical and histological analysis of the genital duct in mature and immature females of Pomacea canaliculata (Lamarck, 1822. Anatomically, the vagina has an equal dimension in its extension, varying in form and volume, according to the maturation period. In the immaturity, it has a smaller diameter and volume. In the maturity, the vagina increases in volume, having the aspect of a tumescent organ, and in certain specimens shows an albuminous pink thread in its lumen. Histologically, the calcigenic activity of the gland is evidentiated by the presence of an amorphous and basophilic mass, without nuclear material. This material has a fragmented aspect in the vagina lumen that reacts positively in van Kossa's coloured preparations for calcareous salts.

  6. Primer registro del caracol manzano exótico Pomacea canaliculata (Gastropoda: Ampullariidae) en México, con comentarios sobre su propagación en el bajo río Colorado / First record of the exotic apple snail Pomacea canaliculata (Gastropoda: Ampullariidae) in Mexico, with remarks on its spreading in the Lower Colorado River

    Scientific Electronic Library Online (English)

    Ernesto, Campos; Gorgonio, Ruiz-Campos; José, Delgadillo.

    2013-06-01

    Full Text Available Se registra por primera vez para México el caracol manzano Pomacea canaliculata (Lamarck, 1822). La especie fue descubierta en varias localidades vecinas a la presa derivadora Matamoros-1950, Algodones, Baja California. La propagación de P. canaliculata en aguas mexicanas fue a través de los afluent [...] es del río Colorado de la población inicialmente introducida en las vecindades de Yuma, Arizona, EUA en el 2005. Hasta el momento no han sido detectados efectos dañinos sobre los cultivos agrícolas del valle de Mexicali, sobre la vegetación o fauna nativa del río Colorado en el lado mexicano. Abstract in english The apple snail Pomacea canaliculata (Lamarck, 1822) is for the first time reported for Mexico. The species was discovered in several locations adjacent to the Matamoros-1950 dam, Algodones, Baja California. The spread of P. canaliculata in Mexican waters was through the tributaries of the Colorado [...] River from a population originally introduced in Yuma, Arizona, USA, around 2005. To date, no harmful effects have been detected on native vegetation, fauna of the Colorado River or agricultural crops in the Mexicali Valley, Baja California.

  7. Catadiscus pomaceae sp. n. (Trematoda, Paramphistomatidae) from Pomacea canaliculata (Lamarck, 1801) (Prosobranchia, Ampullariidae)

    Scientific Electronic Library Online (English)

    Monika Inés, Hamann.

    1992-03-01

    Full Text Available Catadiscus pomaceae sp. n. from the intestine of the prosobranch mollusc Pomacea canaliculata (Lamarck, 1801), is described. The host snail was collected from a lenitic biotope belonging to the Riachuelo basin (Corrientes province, Argentina) during 1985-1986. So far the species of the genus Catadis [...] cus Cohn, 1904 have been recorded in amphibians and reptiles. This is the first instance of a species of that genus parasitizing a mollusc.

  8. Toxicity of botanical insecticides on golden apple snail (Pomacea canaliculata).

    Science.gov (United States)

    Ruamthum, W; Visetson, S; Milne, J R; Bullangpoti, V

    2010-01-01

    The molluscicidal activity of crude extracts from five highly potential plants, Annona squamosa seed, Nerium indicum Leaves, Stemona tuberose root, Cyperus rotundus corm and Derris elliptica root was assessed to Pomacea canaliculata. D. elliptica root and C. rotundus corm extracts showed the highest toxicity against 3-month old snails which have LC50 as 23.68 +/- 2.96 mg/l and 133.20 +/- 7.94 mg/l, respectively. The C. rotundus corm extracts were chosen for detoxification enzyme in vivo assay which shows esterase and glutathione S-transferase activity in stomach, intestinal tracts and digestive glands of survival treated P. canaliculata were inhibited. PMID:21542482

  9. REGISTRO DE POMACEA CANALICULATA (LAMARCK, 1822 (AMPULLARIIDAE, MOLUSCO EXOTICO PARA EL NORTE DE CHILE RECORD OF POMACEA CANALICULATA (LAMARCK, 1822 (AMPULLARIIDAE, EXOTIC MOLLUSK FOR TO NORTH CHILE

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    Douglas Jackson

    2009-01-01

    Full Text Available En este trabajo informamos acerca de la presencia en la costa de Choapa (IV Región de Coquimbo, Chile, de un molusco de agua dulce Pomacea canaliculata (Lammarck, 1822 (Ampullariidae. Se describe la morfología, habitat y relaciones con otros moluscos de agua dulce. Se discute su potencial rol con relación a la zoonosis parasitaria.In this paper we inform about the presence in the coast of Choapa (IV Region of Coquimbo, Chile, of a non-local freshwater mollusk -Pomacea canaliculata (Lamarck, 1822 (Ampullariidae. We describe its morphology, habitat and relations with other freshwater mollusks. We also discuss its potential role as link to the zoonosis parasitaria.

  10. REGISTRO DE POMACEA CANALICULATA (LAMARCK, 1822) (AMPULLARIIDAE), MOLUSCO EXOTICO PARA EL NORTE DE CHILE / RECORD OF POMACEA CANALICULATA (LAMARCK, 1822) (AMPULLARIIDAE), EXOTIC MOLLUSK FOR TO NORTH CHILE

    Scientific Electronic Library Online (English)

    Douglas, Jackson; Donald, Jackson.

    Full Text Available En este trabajo informamos acerca de la presencia en la costa de Choapa (IV Región de Coquimbo, Chile), de un molusco de agua dulce Pomacea canaliculata (Lammarck, 1822) (Ampullariidae). Se describe la morfología, habitat y relaciones con otros moluscos de agua dulce. Se discute su potencial rol con [...] relación a la zoonosis parasitaria. Abstract in english In this paper we inform about the presence in the coast of Choapa (IV Region of Coquimbo, Chile), of a non-local freshwater mollusk -Pomacea canaliculata (Lamarck, 1822) (Ampullariidae). We describe its morphology, habitat and relations with other freshwater mollusks. We also discuss its potential r [...] ole as link to the zoonosis parasitaria.

  11. Naididae (Annelida, Oligochaeta) associated with Pomacea bridgesii (Reeve) (Gastropoda, Ampullaridae) Naididae (Annelida: Oligochaeta) associados a Pomacea bridgesii (Reeve) (Gastropoda, Ampullaridae)

    OpenAIRE

    Guilherme R. Gorni; Roberto da G. Alves

    2006-01-01

    The family Amplullaridae belongs to this class Gastropoda and is made up of freshwater organisms with a wide geographical distribution in tropical regions. Oligochaeta worms can be found in association with snails of this family, inhabiting the umbilicus of their shells. Due to the lack of information on the ecology of these worms, this work focused on investigating which kind of Oligochaeta species associate with the mollusk Pomacea bridgesii (Reeve, 1856). Samples were collected during wint...

  12. Isolation and Characterization of Sixteen Polymorphic Microsatellite Loci in the Golden Apple Snail Pomacea canaliculata

    OpenAIRE

    Yan Liu; Hui Ding; Jun Wu; Hong Li; Haigen Xu; Lian Chen

    2011-01-01

    We report the characterization of 16 polymorphic microsatellite markers in the golden apple snail, Pomacea canaliculata, a pest registered in the list of “100 of the world’s worst invasive alien species”. The fast isolation by AFLP (Amplified Fragment Length Polymorphism) of sequences containing repeats (FIASCO) method was used to isolate microsatellite loci, and polymorphism was explored with 29 individuals collected in an invasive region from China. These primers showed a number of al...

  13. On Pomacea canaliculata (Lamarck, 1822 (Mollusca; Pilidae: Ampullariidae

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    Silvana C. Thiengo

    1993-03-01

    Full Text Available This paper deals with the morphology of Pomacea caniculata (Lamarck, 1822 collected at Corrientes, Argentina. Comparison is made with Pomacea lineata (Spix, 1827 and Pomacea sordida (Swainson, 1823. The shell is globose, heavy, with greenish or horn-colored periostracum and dark spiral bands; apex subelevated, 5-6 whorls increasing rather rapidly and separated by very deep suture. Aperture large, rounded to subelongated; lip sometimes reddish; umbilicus large and deep; operculum corneous, entirely closing the aperture. Ratios: shell width/shell length = 0.78-0.96 (mean 0.86; aperture length/shell length = 0.68-0.77 (mean 0.72. Radula similar to other congeneric species. Testis and spermiduct as in P. lineata and P. sordida; prostate cylindric and short, cream in color as the testis. Penial sheath straight bearing a central outer gland deeply embedded in the tissue of its basal portion and a large wrinkled gland occupying 2/3 of the distal tip of its inner surface; the rigth margin of the sheath overlaps the left one until 2/3 of its proximal end. Female reproductive apparatus similar to that P. lineata; vestigial male copulatory apparatus (penis and its sheath present in all females examined.

  14. Isolation and Characterization of Sixteen Polymorphic Microsatellite Loci in the Golden Apple Snail Pomacea canaliculata

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    Yan Liu

    2011-09-01

    Full Text Available We report the characterization of 16 polymorphic microsatellite markers in the golden apple snail, Pomacea canaliculata, a pest registered in the list of “100 of the world’s worst invasive alien species”. The fast isolation by AFLP (Amplified Fragment Length Polymorphism of sequences containing repeats (FIASCO method was used to isolate microsatellite loci, and polymorphism was explored with 29 individuals collected in an invasive region from China. These primers showed a number of alleles per locus ranging from three to 13. The ranges of observed and expected heterozygosity were 0.310–0.966 and 0.523–0.898, respectively. These microsatellite markers described here will be useful for population genetic studies of P. canaliculata.

  15. Naididae (Annelida, Oligochaeta associated with Pomacea bridgesii (Reeve (Gastropoda, Ampullaridae Naididae (Annelida: Oligochaeta associados a Pomacea bridgesii (Reeve (Gastropoda, Ampullaridae

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    Guilherme R. Gorni

    2006-12-01

    Full Text Available The family Amplullaridae belongs to this class Gastropoda and is made up of freshwater organisms with a wide geographical distribution in tropical regions. Oligochaeta worms can be found in association with snails of this family, inhabiting the umbilicus of their shells. Due to the lack of information on the ecology of these worms, this work focused on investigating which kind of Oligochaeta species associate with the mollusk Pomacea bridgesii (Reeve, 1856. Samples were collected during winter and spring 2003 and summer 2004. From a total of 209 snails collected, the presence of Oligochaeta worms was observed in only 58 of them (27.75%. In these infected snails, 89 Oligochaeta worms were found, all belonging to the family Naididae. The species Haemonais waldvogeli Bretscher, 1900, Dero (Dero nivea Aiyer, 1929 and Dero (Dero sawayai Marcus, 1943 were the most abundant (43.68%, 12.32% and 10.08%, respectively. Haemonais waldvogeli was found in all of the seasons studied, what demonstrates its affinity for this kind of substrate. The results indicate that several Naididae species find in the umbilicus of these snails's shells (which contains fine detritus a favorable habitat for establishing themselves.A família Ampullaridae, pertencente à classe Gastropoda, é caracterizada por organismos de água doce com ampla distribuição na região tropical. Vermes Oligochaeta associados a esses caracóis podem ser encontrados habitando o umbílico de suas conchas. Devido à carência de informação sobre a ecologia desses vermes, o presente trabalho centrou-se em um levantamento de espécies de Oligochaeta associadas ao molusco Pomacea bridgesii (Reeve, 1856. Em amostragens realizadas no inverno e na primavera de 2003 e no verão de 2004, foram observados 209 caracóis, sendo que somente em 58 deles foi detectada a presença de vermes Oligochaeta, correspondendo a uma incidência de 27,75%. Foram encontrados, no total, 89 oligoquetos, todos da família Naididae. As espécies Haemonais waldvogeli Bretscher, 1900, Dero (Dero nivea Aiyer, 1929 e Dero (Dero sawayai Marcus, 1943 apresentaram a maior abundância relativa (43,68%, 12,32% e 10,08%, respectivamente. Espécimes de Haemonais waldvogeli foram encontrados em todos os períodos sazonais, o que demonstra sua afinidade com este tipo de substrato. Os resultados indicam que várias espécies de Naididae encontram no umbílico da concha (que contém detrito fino um habitat favorável para seu estabelecimento.

  16. Naididae (Annelida, Oligochaeta) associated with Pomacea bridgesii (Reeve) (Gastropoda, Ampullaridae) / Naididae (Annelida: Oligochaeta) associados a Pomacea bridgesii (Reeve) (Gastropoda, Ampullaridae)

    Scientific Electronic Library Online (English)

    Guilherme R., Gorni; Roberto da G., Alves.

    2006-12-01

    Full Text Available A família Ampullaridae, pertencente à classe Gastropoda, é caracterizada por organismos de água doce com ampla distribuição na região tropical. Vermes Oligochaeta associados a esses caracóis podem ser encontrados habitando o umbílico de suas conchas. Devido à carência de informação sobre a ecologia [...] desses vermes, o presente trabalho centrou-se em um levantamento de espécies de Oligochaeta associadas ao molusco Pomacea bridgesii (Reeve, 1856). Em amostragens realizadas no inverno e na primavera de 2003 e no verão de 2004, foram observados 209 caracóis, sendo que somente em 58 deles foi detectada a presença de vermes Oligochaeta, correspondendo a uma incidência de 27,75%. Foram encontrados, no total, 89 oligoquetos, todos da família Naididae. As espécies Haemonais waldvogeli Bretscher, 1900, Dero (Dero) nivea Aiyer, 1929 e Dero (Dero) sawayai Marcus, 1943 apresentaram a maior abundância relativa (43,68%, 12,32% e 10,08%, respectivamente). Espécimes de Haemonais waldvogeli foram encontrados em todos os períodos sazonais, o que demonstra sua afinidade com este tipo de substrato. Os resultados indicam que várias espécies de Naididae encontram no umbílico da concha (que contém detrito fino) um habitat favorável para seu estabelecimento. Abstract in english The family Amplullaridae belongs to this class Gastropoda and is made up of freshwater organisms with a wide geographical distribution in tropical regions. Oligochaeta worms can be found in association with snails of this family, inhabiting the umbilicus of their shells. Due to the lack of informati [...] on on the ecology of these worms, this work focused on investigating which kind of Oligochaeta species associate with the mollusk Pomacea bridgesii (Reeve, 1856). Samples were collected during winter and spring 2003 and summer 2004. From a total of 209 snails collected, the presence of Oligochaeta worms was observed in only 58 of them (27.75%). In these infected snails, 89 Oligochaeta worms were found, all belonging to the family Naididae. The species Haemonais waldvogeli Bretscher, 1900, Dero (Dero) nivea Aiyer, 1929 and Dero (Dero) sawayai Marcus, 1943 were the most abundant (43.68%, 12.32% and 10.08%, respectively). Haemonais waldvogeli was found in all of the seasons studied, what demonstrates its affinity for this kind of substrate. The results indicate that several Naididae species find in the umbilicus of these snails's shells (which contains fine detritus) a favorable habitat for establishing themselves.

  17. Loop-mediated isothermal amplification: rapid detection of Angiostrongylus cantonensis infection in Pomacea canaliculata

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    Zhuo MingMing

    2011-10-01

    Full Text Available Abstract Background Angiostrongylus cantonensis is a zoonotic parasite that causes eosinophilic meningitis in humans. The most common source of infection with A. cantonensis is the consumption of raw or undercooked mollusks (e.g., snails and slugs harbouring infectious third-stage larvae (L3. However, the parasite is difficult to identify in snails. The purpose of this study was to develop a quick, simple molecular method to survey for A. cantonensis in intermediate host snails. Findings We used a loop-mediated isothermal amplification (LAMP assay, which was performed using Bst DNA polymerase. Reactions amplified the A. cantonensis 18S rRNA gene and demonstrated high sensitivity; as little as 1 fg of DNA was detected in the samples. Furthermore, no cross-reactivity was found with other parasites such as Toxoplasma gondii, Plasmodium falciparum, Schistosoma japonicum, Clonorchis sinensis, Paragonimus westermani and Anisakis. Pomacea canaliculata snails were exposed to A. cantonensis first-stage larvae (L1 in the laboratory, and L3 were observed in the snails thirty-five days after infection. All nine samples were positive as determined by the LAMP assay for A. cantonensis, which was identified as positive by using PCR and microscopy, this demonstrates that LAMP is sensitive and effective for diagnosis. Conclusions LAMP is an appropriate diagnostic method for the routine identification of A. cantonensis within its intermediate host snail P. canaliculata because of its simplicity, sensitivity, and specificity. It holds great promise as a useful monitoring tool for A. cantonensis in endemic regions.

  18. Characteristics of Feeding Preference and Nutrients Utilization of Golden Apple Snail (Pomacea canaliculata) on Macrophytes in Paddy Fields

    OpenAIRE

    Benliang Zhao; Wei Dai, Jia-en Zhang; Chaogang Cheng; Gen Li

    2012-01-01

    Golden apple snail was a harmful invasive gastropod in Asian wetlands. In order to clarify the effect of Pomacea canaliculata on macrophytes in paddy fields, feeding preference and nutrients utilization of snail were studied. Feeding preference of snail was Alternanthera philoxenoides>Monochoria vaginalis>Oryza sativa L. Snail showed a higher approximate digestion coefficient on Oryza sativa L. than that on Monochoria vaginalis. Nitrogen utilization coefficient of snail on Alternanthera philo...

  19. Variation in worm assemblages associated with Pomacea canaliculata (Caenogastropoda, Ampullariidae in sites near the Río de la Plata estuary, Argentina

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    C. Damborenea

    2006-12-01

    Full Text Available Pomacea canaliculata is a common gastropod in freshwater habitats from Central and Northern Argentina, extending northwards into the Amazon basin. Several Platyhelminthes have been reported associated to P. canaliculata, sharing an intimate relationship with this gastropod host. The objectives of this study were to describe the symbiotic species assemblages associated to P. canaliculata in the study area, and to disclose differences among them. Samples were taken in three typical small streams and one artificial lentic lagoon, all connected with the Río de la Plata estuary. The 81.53% were infested with different symbiotic (sensu lato species. Among the Platyhelminthes, the commensal Temnocephala iheringi Haswell, 1893 was highly prevalent in all samples, always in the mantle cavity. Four trematode taxa were recognized: (a metacercariae of Echinostoma parcespinosum Lutz, 1924 in the mantle cavity and sporocysts in the digestive gland; (b metacercariae of Dietziella egregia (Dietz, 1909 in the pericardial cavity; (c unidentified xiphidiocercariae and (d unidentified sporocysts and furcocercariae in the digestive gland. Nematode larvae and oligochaetes were found in two localities in the mantle cavity. Among the Annelida, Helobdella ampullariae Ringuelet, 1945 was found in the mantle cavity and lung of snails only from one locality. Our results show that although some of the symbionts are present in all localities, others are restricted to some particular ones, whether in their absolute numbers or in their relative abundance. Thus, each hosting population at the studied localities may be defined by the particular combination of symbionts that bears.

  20. Variation in worm assemblages associated with Pomacea canaliculata (Caenogastropoda, Ampullariidae) in sites near the Río de la Plata estuary, Argentina

    Scientific Electronic Library Online (English)

    C., Damborenea; F., Brusa; A., Paola.

    2006-12-01

    Full Text Available Pomacea canaliculata is a common gastropod in freshwater habitats from Central and Northern Argentina, extending northwards into the Amazon basin. Several Platyhelminthes have been reported associated to P. canaliculata, sharing an intimate relationship with this gastropod host. The objectives of th [...] is study were to describe the symbiotic species assemblages associated to P. canaliculata in the study area, and to disclose differences among them. Samples were taken in three typical small streams and one artificial lentic lagoon, all connected with the Río de la Plata estuary. The 81.53% were infested with different symbiotic (sensu lato) species. Among the Platyhelminthes, the commensal Temnocephala iheringi Haswell, 1893 was highly prevalent in all samples, always in the mantle cavity. Four trematode taxa were recognized: (a) metacercariae of Echinostoma parcespinosum Lutz, 1924 in the mantle cavity and sporocysts in the digestive gland; (b) metacercariae of Dietziella egregia (Dietz, 1909) in the pericardial cavity; (c) unidentified xiphidiocercariae and (d) unidentified sporocysts and furcocercariae in the digestive gland. Nematode larvae and oligochaetes were found in two localities in the mantle cavity. Among the Annelida, Helobdella ampullariae Ringuelet, 1945 was found in the mantle cavity and lung of snails only from one locality. Our results show that although some of the symbionts are present in all localities, others are restricted to some particular ones, whether in their absolute numbers or in their relative abundance. Thus, each hosting population at the studied localities may be defined by the particular combination of symbionts that bears.

  1. Characteristics of Feeding Preference and Nutrients Utilization of Golden Apple Snail (Pomacea canaliculata on Macrophytes in Paddy Fields

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    Benliang Zhao

    2012-10-01

    Full Text Available Golden apple snail was a harmful invasive gastropod in Asian wetlands. In order to clarify the effect of Pomacea canaliculata on macrophytes in paddy fields, feeding preference and nutrients utilization of snail were studied. Feeding preference of snail was Alternanthera philoxenoides>Monochoria vaginalis>Oryza sativa L. Snail showed a higher approximate digestion coefficient on Oryza sativa L. than that on Monochoria vaginalis. Nitrogen utilization coefficient of snail on Alternanthera philoxenoides was significantly higher than that on Oryza sativa L. Snail exhibited a higher calcium utilization coefficient on Alternanthera philoxenoides and Monochoria vaginalis than that on Oryza sativa L. Oryza sativa L. was not preferred among three plants under the same available and exposure condition.

  2. First report of Temnocephala haswelli (Platyhelminthes: Temnocephalida) in Pomacea canaliculata (Mollusca: Ampullariidae) from Brazil: description update based on specimens from the state of Rio Grande do Sul, Brazil

    OpenAIRE

    Samantha A. Seixas; José F. R. Amato; Suzana B Amato

    2010-01-01

    The impact of the discovery of Temnocephala haswelli Ponce de Léon, 1989, described as ectosymbionts of ampullariid apple snails outside of Uruguay, motivated us to collect a large number of specimens of Pomacea canaliculata (Lamarck, 1822) from several localities in the southern portion of the state of Rio Grande do Sul. This species was recorded three times after its description: in a study of chromosomes, in a study about the ultrastructure of the collar receptor cells, and in a study of ...

  3. Development beyond the gastrula stage and digestive organogenesis in the apple-snail Pomacea canaliculata (Architaenioglossa, Ampullariidae)

    Scientific Electronic Library Online (English)

    E., Koch; B.C., Winik; A., Castro-Vazquez.

    2009-04-01

    Full Text Available Development of Pomacea canaliculata from the gastrula stage until the first day after hatching is described. Trochophore embryos are developed after gastrulation, showing the prototroch as a crown of ciliated orange-brownish cells. However, no true veliger embryos are formed, since the prototroch do [...] es not fully develop into a velum. Afterward, the connection between the fore- and midgut is permeated and the midgut becomes full of the pink-reddish albumen, which is stored into a central archenteron's lake, from where it is accumulated into the large cells forming the midgut wall ("giant cells"). Electron microscopy of giant cells in late embryos showed that albumen is engulfed by large endocytic vesicles formed between the irregular microvilli at the top of these cells. By the end of intracapsular development, giant cells become gradually replaced by two new epithelial cell types which are similar to those found in the adult midgut gland: the pre-columnar and the pre-pyramidal cells. Pre-columnar cells have inconspicuous basal nuclei and are crowned by stereocilia, between which small endocytic vesicles are formed. Pre-pyramidal cells have large nuclei with 2-3 nucleoli and show a striking development of the rough endoplasmic reticulum. The genesis of the three cell lineages (giant, pre-columnar and pre-pyramidal cells) is hypothetically attributed to epithelial streaks that occur at both sides of the midgut since early stages of development.

  4. A study of chlorophyll-like and phycobilin pigments in the C endosymbiont of the apple- snail Pomacea canaliculata

    Scientific Electronic Library Online (English)

    Israel A., Vega; Federico A., Dellagnola; Jorge A., Hurst; Martín S., Godoy; Alfredo, Castro-Vazquez.

    2012-08-01

    Full Text Available Pigments present in the brown-greenish C morph of an intracellular endosymbiont of Pomacea canaliculata were investigated. Acetone extracts of the endosymbiotic corpuscles showed an absorption spectrum similar to that of chlorophylls. Three fractions obtained from silica gel column chromatography of [...] the acetone extracts (C I, C II and C III), were studied by positive ion fast atom bombardment-mass spectrometry (FAB-MS) and hydrogen-nuclear magnetic resonance (H-NMR). Results indicated the presence of (1) a sterol in the yellow colored C I fraction; (2) a mixture of pheophorbides a and b in the major green fraction, C II; and (3) a modified pheophorbide a in the smaller green fraction, C III. Aqueous extracts of the C endosymbiont did not show evidence of the occurrence of C-phycocyanin, allophycocyanin or phycoerithrin (light absorption, fluorescence emission, and electrophoresis of the protein moieties) while cyanobacterial cells (Nostoc sp.) showed evidence of C-phycocyanin and allophycocyanin. The possible phylogenetic and functional significance of the pigments present in the C endosymbiont is discussed.

  5. New approaches to the management of golden apple snail, Pomacea canaliculata (Lamarck): An invasive alien pest species of rice

    International Nuclear Information System (INIS)

    Full text: Golden apple snail (GAS), Pomacea canaliculata (Lamarck) is native to South America. It was introduced to farmers in the Philippines in the 1980s from Argentina via Taiwan, and to other countries in Asia to increase their income and to enrich the protein intake in their diet, and also as an aquarium pet. The Global Invasive Species (IAS) FAO report that it causes 1.2 billion USD losses to aquatic crops particularly rice, taro and morning glory in Asian countries and the USA. Aside from being a serious agricultural pest, it is also an environmental pest. In an attempt to control GAS resource-poor-farmers resort to 'shot-gun approach' of using toxic and non specific agrochemicals thereby aggravating ecosystem pollution, risking their health and causing loss of aquatic biodiversity. GAS is expanding its distribution westwards in Asia and poses new threats of its invasion in Australia, India, Bangladesh and Pakistan. At the Philippine Rice Research Institute (PhilRice), my team focuses on two approaches. First we have to understand the field ecology of the GAS and identify weak-links in their life cycle. Then we use this basic information to manage GAS at the village level within the community in an ecologically sustainable socially acceptable and economically viable ways. I shall discuss how this LAS in transplanted lowland irrigated rice ecologies can be managed using locally available attractants during the vulnerable stage(s) of rice crop growth. New approae stage(s) of rice crop growth. New approaches will highlight the innovative and applied techniques on how to prevent the rampant abuse/misuse of agrochemicals, as well as GAS utilisation in weed management in rice fields and as aqua feed. In future, it is necessary to develop collaborative exploratory research with the IAEA and the Philippine Nuclear Research Institute (PNRI) to develop an effective area-wide management of GAS in direct-seeded rice systems that will capitalise on an integrated approach and environment-friendly technologies. (author)

  6. Immune Defenses of the Invasive Apple Snail Pomacea canaliculata (Caenogastropoda, Ampullariidae): Phagocytic Hemocytes in the Circulation and the Kidney.

    Science.gov (United States)

    Cueto, Juan A; Rodriguez, Cristian; Vega, Israel A; Castro-Vazquez, Alfredo

    2015-01-01

    Hemocytes in the circulation and kidney islets, as well as their phagocytic responses to microorganisms and fluorescent beads, have been studied in Pomacea canaliculata, using flow cytometry, light microscopy (including confocal laser scanning microscopy) and transmission electron microscopy (TEM). Three circulating hemocyte types (hyalinocytes, agranulocytes and granulocytes) were distinguished by phase contrast microscopy of living cells and after light and electron microscopy of fixed material. Also, three different populations of circulating hemocytes were separated by flow cytometry, which corresponded to the three hemocyte types. Hyalinocytes showed a low nucleus/cytoplasm ratio, and no apparent granules in stained material, but showed granules of moderate electron density under TEM (L granules) and at least some L granules appear acidic when labeled with LysoTracker Red. Both phagocytic and non-phagocytic hyalinocytes lose most (if not all) L granules when exposed to microorganisms in vitro. The phagosomes formed differed whether hyalinocytes were exposed to yeasts or to Gram positive or Gram negative bacteria. Agranulocytes showed a large nucleus/cytoplasm ratio and few or no granules. Granulocytes showed a low nucleus/cytoplasm ratio and numerous eosinophilic granules after staining. These granules are electron dense and rod-shaped under TEM (R granules). Granulocytes may show merging of R granules into gigantic ones, particularly when exposed to microorganisms. Fluorescent bead exposure of sorted hemocytes showed phagocytic activity in hyalinocytes, agranulocytes and granulocytes, but the phagocytic index was significantly higher in hyalinocytes. Extensive hemocyte aggregates ('islets') occupy most renal hemocoelic spaces and hyalinocyte-like cells are the most frequent component in them. Presumptive glycogen deposits were observed in most hyalinocytes in renal islets (they also occur in the circulation but less frequently) and may mean that hyalinocytes participate in the storage and circulation of this compound. Injection of microorganisms in the foot results in phagocytosis by hemocytes in the islets, and the different phagosomes formed are similar to those in circulating hyalinocytes. Dispersed hemocytes were obtained after kidney collagenase digestion and cell sorting, and they were able to phagocytize fluorescent beads. A role for the kidney as an immune barrier is proposed for this snail. PMID:25893243

  7. Immune Defenses of the Invasive Apple Snail Pomacea canaliculata (Caenogastropoda, Ampullariidae): Phagocytic Hemocytes in the Circulation and the Kidney

    Science.gov (United States)

    Vega, Israel A.; Castro-Vazquez, Alfredo

    2015-01-01

    Hemocytes in the circulation and kidney islets, as well as their phagocytic responses to microorganisms and fluorescent beads, have been studied in Pomacea canaliculata, using flow cytometry, light microscopy (including confocal laser scanning microscopy) and transmission electron microscopy (TEM). Three circulating hemocyte types (hyalinocytes, agranulocytes and granulocytes) were distinguished by phase contrast microscopy of living cells and after light and electron microscopy of fixed material. Also, three different populations of circulating hemocytes were separated by flow cytometry, which corresponded to the three hemocyte types. Hyalinocytes showed a low nucleus/cytoplasm ratio, and no apparent granules in stained material, but showed granules of moderate electron density under TEM (L granules) and at least some L granules appear acidic when labeled with LysoTracker Red. Both phagocytic and non-phagocytic hyalinocytes lose most (if not all) L granules when exposed to microorganisms in vitro. The phagosomes formed differed whether hyalinocytes were exposed to yeasts or to Gram positive or Gram negative bacteria. Agranulocytes showed a large nucleus/cytoplasm ratio and few or no granules. Granulocytes showed a low nucleus/cytoplasm ratio and numerous eosinophilic granules after staining. These granules are electron dense and rod-shaped under TEM (R granules). Granulocytes may show merging of R granules into gigantic ones, particularly when exposed to microorganisms. Fluorescent bead exposure of sorted hemocytes showed phagocytic activity in hyalinocytes, agranulocytes and granulocytes, but the phagocytic index was significantly higher in hyalinocytes. Extensive hemocyte aggregates ('islets') occupy most renal hemocoelic spaces and hyalinocyte-like cells are the most frequent component in them. Presumptive glycogen deposits were observed in most hyalinocytes in renal islets (they also occur in the circulation but less frequently) and may mean that hyalinocytes participate in the storage and circulation of this compound. Injection of microorganisms in the foot results in phagocytosis by hemocytes in the islets, and the different phagosomes formed are similar to those in circulating hyalinocytes. Dispersed hemocytes were obtained after kidney collagenase digestion and cell sorting, and they were able to phagocytize fluorescent beads. A role for the kidney as an immune barrier is proposed for this snail. PMID:25893243

  8. Selektivitas fraksi R f < 0,5 ekstrak etil asetat (EtOAc biji putat air (Barringtonia racemosaterhadap keong mas (Pomacea canaliculata dan ikan lele lokal (Clarias batrachus

    Directory of Open Access Journals (Sweden)

    Musri Musman

    2012-08-01

    Full Text Available Penelitian untuk mengetahui selektivitas fraksi Rf < 0,5 ekstrak EtOAc biji putat air (Barringtonia racemosa terhadap keong mas (Pomacea canaliculata dan lele lokal (Clarias batrachus telah dilakukan pada bulan Februari 2012 di Laboratorium Kimia Fakultas Keguruan dan Ilmu Pendidikan dan Laboratorium Kimia Laut Koordinatorat Kelautan dan Perikanan Universitas Syiah Kuala. Kromatografi lapis tipis digunakan sebagai teknik pemisahan komponen senyawaan dalam ekstrak cuplikan, dan pengujian keaktifan biologi didasarkan pada kaedah yang dianjurkan oleh FAO. Data mortalitas keong mas dan lele lokal yang diperoleh karena pemberian fraksi Rf < 0,5 ekstrak EtOAc biji B. racemosa dianalisa dengan program Probit, dan harga selektivitas (S diolah berdasarkan formula Feng dan Wang. Harga LC50 fraksi Rf< 0,5 ekstrak EtOAc biji B. racemosa terhadap P. canaliculata dan C.batracus masing-masing adalah 29,26 ppm dan 44,47 ppm. Nilai selektivitas fraksi Rf< 0,5 ekstrak EtOAc biji B.racemosa terhadap organisme uji adalah 1.51. Penelitian ini menunjukkan bahwa fraksi Rf < 0,5 ekstrak EtOAc biji putat air memiliki bioaktif sebagai moluskosida keong mas.

  9. The effect of stocking density on the growth of apple snails native Pomacea bridgesii and exotic Pomacea lineata (Mollusca, Gastropoda)

    Scientific Electronic Library Online (English)

    ESMAR SOUZA, JUNIOR; JOSE CARLOS N. DE, BARROS; KARLA, PARESQUE; RODRIGO R. DE, FREITAS.

    2013-06-01

    Full Text Available The demand for alternative food sources is currently in evidence in the world and, therefore, the culture of animal species considered not conventional makes this theme relevant and appropriate. In the present study, the species Pomacea lineata and Pomacea bridgesii, each with three stowage densitie [...] s (0.5 [T1], 1 [T2], and 1.5 [T3] animal/L), were tested. They were analyzed regarding growth rate, weight gain, final biomass, feed conversion and percentage of survival. There was not any statistically significant difference between the different densities for both species. The final average weight in the three waterworks did not differ significantly in P. bridgesii. In P. lineata, T1 (22.3 ± 1.80g) was significantly higher than T2 and T3. On the other hand, the absolute gain of weight in P. lineata and P. bridgesii was significantly higher in T1 (21.9 ± 1.80g and 37.2 ± 6.34g) than in T2 and T3 respectively. In contrast, the gain of biomass of P. lineata and P. bridgesii was significantly higher in T3 (276.3 ± 33.16g and 431.4 ± 37.20g) than in T1 and T2, respectively. Based on the results obtained, all species studied presented potential for aquaculture, mainly P. bridgesii, distinguished for showing a better development even in waterworks with higher densities.

  10. The effect of stocking density on the growth of apple snails native Pomacea bridgesii and exotic Pomacea lineata (Mollusca, Gastropoda

    Directory of Open Access Journals (Sweden)

    ESMAR SOUZA JÚNIOR

    2013-06-01

    Full Text Available The demand for alternative food sources is currently in evidence in the world and, therefore, the culture of animal species considered not conventional makes this theme relevant and appropriate. In the present study, the species Pomacea lineata and Pomacea bridgesii, each with three stowage densities (0.5 [T1], 1 [T2], and 1.5 [T3] animal/L, were tested. They were analyzed regarding growth rate, weight gain, final biomass, feed conversion and percentage of survival. There was not any statistically significant difference between the different densities for both species. The final average weight in the three waterworks did not differ significantly in P. bridgesii. In P. lineata, T1 (22.3 ± 1.80g was significantly higher than T2 and T3. On the other hand, the absolute gain of weight in P. lineata and P. bridgesii was significantly higher in T1 (21.9 ± 1.80g and 37.2 ± 6.34g than in T2 and T3 respectively. In contrast, the gain of biomass of P. lineata and P. bridgesii was significantly higher in T3 (276.3 ± 33.16g and 431.4 ± 37.20g than in T1 and T2, respectively. Based on the results obtained, all species studied presented potential for aquaculture, mainly P. bridgesii, distinguished for showing a better development even in waterworks with higher densities.

  11. The effect of stocking density on the growth of apple snails native Pomacea bridgesii and exotic Pomacea lineata (Mollusca, Gastropoda).

    Science.gov (United States)

    Souza Júnior, Esmar; De Barros, José Carlos N; Paresque, Karla; De Freitas, Rodrigo R

    2013-01-01

    The demand for alternative food sources is currently in evidence in the world and, therefore, the culture of animal species considered not conventional makes this theme relevant and appropriate. In the present study, the species Pomacea lineata and Pomacea bridgesii, each with three stowage densities (0.5 [T1], 1 [T2], and 1.5 [T3] animal/L), were tested. They were analyzed regarding growth rate, weight gain, final biomass, feed conversion and percentage of survival. There was not any statistically significant difference between the different densities for both species. The final average weight in the three waterworks did not differ significantly in P. bridgesii. In P. lineata, T1 (22.3 ± 1.80g) was significantly higher than T2 and T3. On the other hand, the absolute gain of weight in P. lineata and P. bridgesii was significantly higher in T1 (21.9 ± 1.80g and 37.2 ± 6.34g) than in T2 and T3 respectively. In contrast, the gain of biomass of P. lineata and P. bridgesii was significantly higher in T3 (276.3 ± 33.16g and 431.4 ± 37.20g) than in T1 and T2, respectively. Based on the results obtained, all species studied presented potential for aquaculture, mainly P. bridgesii, distinguished for showing a better development even in waterworks with higher densities. PMID:23828367

  12. First report of Temnocephala haswelli (Platyhelminthes: Temnocephalida) in Pomacea canaliculata (Mollusca: Ampullariidae) from Brazil: description update based on specimens from the state of Rio Grande do Sul, Brazil

    Scientific Electronic Library Online (English)

    Samantha A., Seixas; José F. R., Amato; Suzana B., Amato.

    2010-06-01

    Full Text Available The impact of the discovery of Temnocephala haswelli Ponce de Léon, 1989, described as ectosymbionts of ampullariid apple snails outside of Uruguay, motivated us to collect a large number of specimens of Pomacea canaliculata (Lamarck, 1822) from several localities in the southern portion of the stat [...] e of Rio Grande do Sul. This species was recorded three times after its description: in a study of chromosomes, in a study about the ultrastructure of the collar receptor cells, and in a study of the Haswell glands, all conducted in Uruguay. A total of 301 specimens of P. canaliculata were collected from 1999 to 2007. Temnocephalans found in the pallial cavity were identified as T. haswelli, which occurred in single infestations or concurrently with Temnocephala iheringi Haswell, 1893. Helminths usually showed a light-orange body pigmentation and conspicuous, intense red-eye pigment. Many taxonomic characters evidenced by several techniques were documented photographically for the first time. The typical curved cirrus, approximately 90°, typical of the species, showed some variation in the width of the shaft base, whereas the first longitudinal row of spines of the introvert appeared with shorter spines. The vagina was found to be thick-walled, but not very muscular, and to have a single, large and slightly asymmetrical sphincter, with the posterior portion of slightly larger diameter. Eggs were observed in the umbilicus and along the suture, but predominantly in the body whorl of the shell. Egg peduncles were found to be very short or, most of the time, the eggs were sessile, always with a long apical filament. The rounded shape of the dorsolateral 'excretory' syncytial epidermal plates had external margins reaching the ventrolateral region of the body and eccentric nephridiopores. This is the first record of the species outside Uruguay and in Brazil.

  13. First report of Temnocephala haswelli (Platyhelminthes: Temnocephalida in Pomacea canaliculata (Mollusca: Ampullariidae from Brazil: description update based on specimens from the state of Rio Grande do Sul, Brazil

    Directory of Open Access Journals (Sweden)

    Samantha A. Seixas

    2010-06-01

    Full Text Available The impact of the discovery of Temnocephala haswelli Ponce de Léon, 1989, described as ectosymbionts of ampullariid apple snails outside of Uruguay, motivated us to collect a large number of specimens of Pomacea canaliculata (Lamarck, 1822 from several localities in the southern portion of the state of Rio Grande do Sul. This species was recorded three times after its description: in a study of chromosomes, in a study about the ultrastructure of the collar receptor cells, and in a study of the Haswell glands, all conducted in Uruguay. A total of 301 specimens of P. canaliculata were collected from 1999 to 2007. Temnocephalans found in the pallial cavity were identified as T. haswelli, which occurred in single infestations or concurrently with Temnocephala iheringi Haswell, 1893. Helminths usually showed a light-orange body pigmentation and conspicuous, intense red-eye pigment. Many taxonomic characters evidenced by several techniques were documented photographically for the first time. The typical curved cirrus, approximately 90°, typical of the species, showed some variation in the width of the shaft base, whereas the first longitudinal row of spines of the introvert appeared with shorter spines. The vagina was found to be thick-walled, but not very muscular, and to have a single, large and slightly asymmetrical sphincter, with the posterior portion of slightly larger diameter. Eggs were observed in the umbilicus and along the suture, but predominantly in the body whorl of the shell. Egg peduncles were found to be very short or, most of the time, the eggs were sessile, always with a long apical filament. The rounded shape of the dorsolateral 'excretory' syncytial epidermal plates had external margins reaching the ventrolateral region of the body and eccentric nephridiopores. This is the first record of the species outside Uruguay and in Brazil.

  14. First report of Temnocephala rochensis (Platyhelminthes: Temnocephalida from Pomacea canaliculata (Mollusca: Ampullariidae outside Uruguay: description update based on specimens from the state of Rio Grande do Sul, Brazil

    Directory of Open Access Journals (Sweden)

    Samantha A. Seixas

    2010-10-01

    Full Text Available Temnocephala rochensis Ponce de Léon, 1979, was the second of four species of Temnocephala Blanchard, 1849 to be described as ectosymbiont of ampullariid apple snails, Pomacea canaliculata (Lamarck, 1822. There have been no records of this Uruguayan species after its initial description. As part of the present study, 111 specimens of P. canaliculata were collected between 2003 and 2009. Temnocephalans found in the pallial cavity were identified as T. rochensis, occurring in single infestations, or concurrently with Temnocephala haswelli Ponce de Léon, 1989. Specimens of T. rochensis showed a conspicuous red eye pigment which faded after ethanol fixation. Important taxonomic characters of the reproductive system were evidenced by several techniques, and documented photographically for the first time for this species: 1 the typical curved cirrus of the species showing very short and stout spines; 2 the vagina with the proximal portion dilated, forming a "vesicula intermedia"; and 3 the distal portion very muscular, as well as the large and symmetrical vaginal sphincter were documented in detail with Nomarski's DIC microscopy. Eggs were observed in the suture, in the spire, and in the umbilicus of the shell; they had a short peduncle or were sessile, always with short and curved, sometimes straight apical filaments. The rounded shape of the dorsolateral 'excretory' syncytial epidermal plates had central nephridiopores. This is the first record of this species outside of Uruguay and in the State of Rio Grande do Sul, Brazil. Even with extended sampling efforts in the eastern region of Rio Grande do Sul, T. rochensis has not been found, showing a geographical distribution restricted to the southern region, close to its type locality of Laguna Negra, Uruguay.

  15. First report of Temnocephala rochensis (Platyhelminthes: Temnocephalida) from Pomacea canaliculata (Mollusca: Ampullariidae) outside Uruguay: description update based on specimens from the state of Rio Grande do Sul, Brazil

    Scientific Electronic Library Online (English)

    Samantha A., Seixas; José F. R., Amato; Suzana B., Amato.

    2010-10-01

    Full Text Available Temnocephala rochensis Ponce de Léon, 1979, was the second of four species of Temnocephala Blanchard, 1849 to be described as ectosymbiont of ampullariid apple snails, Pomacea canaliculata (Lamarck, 1822). There have been no records of this Uruguayan species after its initial description. As part of [...] the present study, 111 specimens of P. canaliculata were collected between 2003 and 2009. Temnocephalans found in the pallial cavity were identified as T. rochensis, occurring in single infestations, or concurrently with Temnocephala haswelli Ponce de Léon, 1989. Specimens of T. rochensis showed a conspicuous red eye pigment which faded after ethanol fixation. Important taxonomic characters of the reproductive system were evidenced by several techniques, and documented photographically for the first time for this species: 1) the typical curved cirrus of the species showing very short and stout spines; 2) the vagina with the proximal portion dilated, forming a "vesicula intermedia"; and 3) the distal portion very muscular, as well as the large and symmetrical vaginal sphincter were documented in detail with Nomarski's DIC microscopy. Eggs were observed in the suture, in the spire, and in the umbilicus of the shell; they had a short peduncle or were sessile, always with short and curved, sometimes straight apical filaments. The rounded shape of the dorsolateral 'excretory' syncytial epidermal plates had central nephridiopores. This is the first record of this species outside of Uruguay and in the State of Rio Grande do Sul, Brazil. Even with extended sampling efforts in the eastern region of Rio Grande do Sul, T. rochensis has not been found, showing a geographical distribution restricted to the southern region, close to its type locality of Laguna Negra, Uruguay.

  16. Biological control of golden apple snail, Pomacea canaliculata by Chinese soft-shelled turtle, Pelodiscus sinensis in the wild rice, Zizania latifolia field

    Scientific Electronic Library Online (English)

    Shengzhang, Dong; Guowan, Zheng; Xiaoping, Yu; Changhuan, Fu.

    2012-04-01

    Full Text Available The wild rice, Zizania latifolia Turcz, used to be one of the important aquatic vegetables cultivated in China. Recently, the golden apple snail - GAS (Pomacea canaliculata (Lamarck)) was found to be a major invasive pest attacking Z. latifolia. To control efficiently GAS, predation by the Chinese s [...] oft-shelled turtles (Pelodiscus sinensis) on GAS was evaluated in laboratory and field trials. P. sinensis had a strong predatory capacity and selectivity for GAS both in laboratory and field conditions. All the sizes of P. sinensis prefer to capture smaller snails. The optimum number of P. sinensis released in Z. latifolia field was dependent on the density of over-wintered GAS, and varied between 30 and 50 turtles per 666.7 m². The number of GAS declined in the fields with turtles as compared to turtle-free field. A pattern of releasing P. sinensis in Z. latifolia fields was developed and widely adopted by farmers because of much more benefit besides biologically controlling GAS.

  17. Biological control of golden apple snail, Pomacea canaliculata by Chinese soft-shelled turtle, Pelodiscus sinensis in the wild rice, Zizania latifolia field

    Directory of Open Access Journals (Sweden)

    Shengzhang Dong

    2012-04-01

    Full Text Available The wild rice, Zizania latifolia Turcz, used to be one of the important aquatic vegetables cultivated in China. Recently, the golden apple snail - GAS (Pomacea canaliculata (Lamarck was found to be a major invasive pest attacking Z. latifolia. To control efficiently GAS, predation by the Chinese soft-shelled turtles (Pelodiscus sinensis on GAS was evaluated in laboratory and field trials. P. sinensis had a strong predatory capacity and selectivity for GAS both in laboratory and field conditions. All the sizes of P. sinensis prefer to capture smaller snails. The optimum number of P. sinensis released in Z. latifolia field was dependent on the density of over-wintered GAS, and varied between 30 and 50 turtles per 666.7 m². The number of GAS declined in the fields with turtles as compared to turtle-free field. A pattern of releasing P. sinensis in Z. latifolia fields was developed and widely adopted by farmers because of much more benefit besides biologically controlling GAS.

  18. Freshwater snail Pomacea bridgesii (Gastropoda: Ampullariidae), life history traits and aquaculture potential

    OpenAIRE

    Ana R. A. Coelho; Gonçalo J. P. Calado; Maria T. Dinis

    2012-01-01

    Investigations on the reproductive biology, life cycle and feeding habits of Pomacea bridgesiihave been undertaken to assess its potential as a cultured species for the ornamental trade. The speciesis dioecious and, under optimal culture conditions of temperature and food supply, it can breed all yearround. The total developmental period at 23±1ºC varied from 15 to 24 days after oviposition. Hatchingcan last for up to 20 hours in the same egg cluster. Hatching success was very high (mean94....

  19. Freshwater snail Pomacea bridgesii (Gastropoda: Ampullariidae, life history traits and aquaculture potential

    Directory of Open Access Journals (Sweden)

    Ana R. A. Coelho

    2012-07-01

    Full Text Available Investigations on the reproductive biology, life cycle and feeding habits of Pomacea bridgesiihave been undertaken to assess its potential as a cultured species for the ornamental trade. The speciesis dioecious and, under optimal culture conditions of temperature and food supply, it can breed all yearround. The total developmental period at 23±1ºC varied from 15 to 24 days after oviposition. Hatchingcan last for up to 20 hours in the same egg cluster. Hatching success was very high (mean94.56±0.62% and no significant differences were observed in hatching rates between different clutchsizes. Development is direct and juveniles hatch at shell length (SL = 2.4±0.25 mm. Maturity is reached192±1.5 days after hatching and at SL = 32.80±2.03 mm. Two feeding experiments were undertaken toassess the impact of food type on juvenile survival during the first 8 days post-hatching and subsequentgrowth until 90 days post-hatching. Compatibility between other fish and plants fresh-water aquariumspecies were performed. A combination of environmental tolerance, moderately amphibious behavior,fast growth, short development and hatching at an advanced stage, compatibility with other aquariumspecies (fishes or other invertebrates, and simple low cost diet, make P. bridgesii highly suitable forintensive culture for the ornamental trade.

  20. Redescription of Temnocephala iheringi (Platyhelminthes: Temnocephalida) based on specimens from Pomacea canaliculata (Mollusca: Ampullariidae) of the state of Rio Grande do Sul, Brazil: the possible type host and type locality

    Scientific Electronic Library Online (English)

    Samantha A., Seixas; José F. R., Amato; Suzana B., Amato.

    2010-04-01

    Full Text Available The original description of Temnocephala iheringi Haswell, 1893 was based on specimens collected by Hermann von Ihering from undetermined ampullariid apple snails, which at that time were identified as Ampullaria sp., and sent to William H. Haswell, with the type locality simply indicated as Brazil. [...] The type specimens studied by Haswell were not found in the scientific collections of Brazil, Europe or Australia, and should be considered lost. In 1941, Pereira & Cuocolo collected specimens from apple snails, identified as Pomacea lineata (Spix in Wagner, 1827), at two localities (Guaicurús and Salobra) in the state of Mato Grosso do Sul, central Brazil. These specimens could not be located either and should, thus, be considered lost as well. Pomacea canaliculata (Lamarck, 1822), the main host of T. iheringi in southern Brazil, is known to have a geographical distribution that reaches Uruguay and 400 km beyond the province of Buenos Aires, Argentina. Three hundred and one mollusks were collected from 1999 to 2007. Temnocephalans found in the pallial cavity presented a greenish body pigmentation (adults) and lacked eye pigment of any color, including the red-eye pigment, typical of Neotropical species of Temnocephala Blanchard, 1849; straight cirrus, with a thick band at base of the introvert' swelling; and a single, circular, asymmetric vaginal sphincter, wider in diameter in the posterior portion. As the species occurs concurrently with two other species, at least in P. canaliculata from Rio Grande do Sul, the eggs of T. iheringi could not be reliably distinguished. A redescription of the species is provided. A comparison of data from the present work with those of earlier papers published on T. iheringi from Argentina showed that the Argentinean specimens had the smallest measurements.

  1. Redescription of Temnocephala iheringi (Platyhelminthes: Temnocephalida based on specimens from Pomacea canaliculata (Mollusca: Ampullariidae of the state of Rio Grande do Sul, Brazil: the possible type host and type locality

    Directory of Open Access Journals (Sweden)

    Samantha A. Seixas

    2010-04-01

    Full Text Available The original description of Temnocephala iheringi Haswell, 1893 was based on specimens collected by Hermann von Ihering from undetermined ampullariid apple snails, which at that time were identified as Ampullaria sp., and sent to William H. Haswell, with the type locality simply indicated as Brazil. The type specimens studied by Haswell were not found in the scientific collections of Brazil, Europe or Australia, and should be considered lost. In 1941, Pereira & Cuocolo collected specimens from apple snails, identified as Pomacea lineata (Spix in Wagner, 1827, at two localities (Guaicurús and Salobra in the state of Mato Grosso do Sul, central Brazil. These specimens could not be located either and should, thus, be considered lost as well. Pomacea canaliculata (Lamarck, 1822, the main host of T. iheringi in southern Brazil, is known to have a geographical distribution that reaches Uruguay and 400 km beyond the province of Buenos Aires, Argentina. Three hundred and one mollusks were collected from 1999 to 2007. Temnocephalans found in the pallial cavity presented a greenish body pigmentation (adults and lacked eye pigment of any color, including the red-eye pigment, typical of Neotropical species of Temnocephala Blanchard, 1849; straight cirrus, with a thick band at base of the introvert' swelling; and a single, circular, asymmetric vaginal sphincter, wider in diameter in the posterior portion. As the species occurs concurrently with two other species, at least in P. canaliculata from Rio Grande do Sul, the eggs of T. iheringi could not be reliably distinguished. A redescription of the species is provided. A comparison of data from the present work with those of earlier papers published on T. iheringi from Argentina showed that the Argentinean specimens had the smallest measurements.

  2. The effect of stocking density on the growth of apple snails native Pomacea bridgesii and exotic Pomacea lineata (Mollusca, Gastropoda)

    OpenAIRE

    ESMAR SOUZA JÚNIOR; JOSÉ CARLOS N. DE BARROS; KARLA PARESQUE; Rodrigo R. Freitas

    2013-01-01

    The demand for alternative food sources is currently in evidence in the world and, therefore, the culture of animal species considered not conventional makes this theme relevant and appropriate. In the present study, the species Pomacea lineata and Pomacea bridgesii, each with three stowage densities (0.5 [T1], 1 [T2], and 1.5 [T3] animal/L), were tested. They were analyzed regarding growth rate, weight gain, final biomass, feed conversion and percentage of survival. There was not any statist...

  3. Morphometric study of a Brazilian strain of Carchesium polypinum (Ciliophora: Peritrichia) attached to Pomacea figulina (Mollusca: Gastropoda), with notes on a high infestation

    Scientific Electronic Library Online (English)

    Roberto Júnio P., Dias; Adalgisa F., Cabral; Isabel C. V., Siqueira-Castro; Inácio D. da, Silva-Neto; Marta, D' Agosto.

    2010-06-01

    Full Text Available During an ecological study of the epibiotic relationship between ciliate protists and Pomacea figulina (Spix, 1827) (Gastropoda, Ampullariidae), originating from an urban stream in southeast Brazil, a high infestation by the peritrich ciliate Carchesium polypinum (Linnaeus, 1758) Ehrenberg, 1830 (Ci [...] liophora, Peritrichia) associated to the shell of one mollusc among 23 was observed. We provided a morphological and morphometric study of C. polypinum using observations of specimens in vivo, after protargol staining, and examined using scanning electron microscopy. The Brazilian-population of C. polypinum is characterized by: size of zooid in vivo 89 µm x 57 µm on average; colony regularly dichotomously branched with usually up to 40 zooids; macronucleus usually J-shaped; single contractile vacuole located in the upper third of body; myoneme not continuous throughout the colony; stalks contract despite the discontinuity of their individual myonemes; polykinety comprises three peniculi, each consisting of three kineties. The high infestation showed here could be related to the preference for eutrophic environments showed by C. polypinum and suggested that ciliate epibionts may be ecologically important in aquatic habitats.

  4. Agglutinating Activity and Structural Characterization of Scalarin, the Major Egg Protein of the Snail Pomacea scalaris (d’Orbigny, 1832)

    OpenAIRE

    Ituarte, Santiago; Dreon, Marcos S.; Ceoli?n, Marcelo Rau?l; Heras, Horacio

    2012-01-01

    Apple snail perivitellins are emerging as ecologically important reproductive proteins. To elucidate if the protective functions of the egg proteins of Pomacea canaliculata (Caenogastropoda, Ampullariidae), involved in embryo defenses, are present in other Pomacea species we studied scalarin (PsSC), the major perivitellin of Pomacea scalaris. Using small angle X-ray scattering, fluorescence and absorption spectroscopy and biochemical methods, we analyzed PsSC structural stability, agglutinati...

  5. Mollusks (Gastropoda and Bivalvia) of the Multiple-Use Reserve Martín García Island, Río de la Plata River: biodiversity and ecology.

    Science.gov (United States)

    César, I I; Martín, S M; Rumi, A; Tassara, M

    2012-02-01

    The Island of Martin Garcia is located in the Upper Río de la Plata, to the south of mouth the Uruguay River. The aim of the present study was to analyse the biodiversity of the island freshwater mollusks and their relationships to environmental variables. Twelve sampling sites were selected, five were along the littoral section of the island and seven were Inland ponds. Seven major environmental variables were measured: water and air temperature, percentage of oxygen saturation, dissolved oxygen, electrical conductivity, total dissolved solids and pH. Twenty-seven mollusk species were found, Antillorbis nordestensis, Biomphalaria tenagophila tenagophila , B. t. guaibensis, B. straminea, B. peregrina, Drepanotrema kermatoides, D. cimex, D. depressissimum, Chilina fluminea, C. rushii, C. megastoma, Uncancylus concentricus, Hebetancylus moricandi, Stenophysa marmorata, Heleobia piscium, H. parchappii, Potamolithus agapetus, P. buschii, P. lapidum, Pomacea canaliculata, P. megastoma, Asolene platae, Corbicula fluminea, Eupera platensis, Pisidium sterkianum, P. taraguyense and Limnoperna fortunei. UPGMA clustering of species based on their occurrence in different ecological conditions revealed two main species groups. The Canonical Correspondence Analysis suggests that the species distribution is related to the physico-chemical condition of water. Axis two of the ordination diagram displayed the approximately 95.6% of the correlation between species and environmental variables. Dissolved oxygen, conductivity, water temperature and pH showed the highest fluctuations during the sampling period. The species richness (S) showed relationships mainly with water temperature and conductivity. The biodiversity of the gastropods and bivalves from Martín García Island amounts to up to 26 species. Among the Gastropoda, the Planorbidae family made the most sizeable contribution. The Lithogliphidae P. agapetus (26.28%) and P. buschii (9.50%) showed the highest relative frequencies of occurrence within the littoral environments, while the Planorbidae D. cimex (23.83%) and D. kermatoides (11.59%) likewise did so in the inland ponds. PMID:22437392

  6. Mollusks (Gastropoda and Bivalvia of the Multiple-Use Reserve Martín García Island, Río de la Plata River: biodiversity and ecology Moluscos (Gastropoda e Bivalvia da Reserva Natural de Usos Múltiplos Ilha Martín García, Rio de La Plata: biodiversidade e ecologia

    Directory of Open Access Journals (Sweden)

    II César

    2012-02-01

    Full Text Available The Island of Martin Garcia is located in the Upper Río de la Plata, to the south of mouth the Uruguay River. The aim of the present study was to analyse the biodiversity of the island freshwater mollusks and their relationships to environmental variables. Twelve sampling sites were selected, five were along the littoral section of the island and seven were Inland ponds. Seven major environmental variables were measured: water and air temperature, percentage of oxygen saturation, dissolved oxygen, electrical conductivity, total dissolved solids and pH. Twenty-seven mollusk species were found, Antillorbis nordestensis, Biomphalaria tenagophila tenagophila , B. t. guaibensis, B. straminea, B. peregrina, Drepanotrema kermatoides, D. cimex, D. depressissimum, Chilina fluminea, C. rushii, C. megastoma, Uncancylus concentricus, Hebetancylus moricandi, Stenophysa marmorata, Heleobia piscium, H. parchappii, Potamolithus agapetus, P. buschii, P. lapidum, Pomacea canaliculata, P. megastoma, Asolene platae, Corbicula fluminea, Eupera platensis, Pisidium sterkianum, P. taraguyense and Limnoperna fortunei. UPGMA clustering of species based on their occurrence in different ecological conditions revealed two main species groups. The Canonical Correspondence Analysis suggests that the species distribution is related to the physico-chemical condition of water. Axis two of the ordination diagram displayed the approximately 95.6% of the correlation between species and environmental variables. Dissolved oxygen, conductivity, water temperature and pH showed the highest fluctuations during the sampling period. The species richness (S showed relationships mainly with water temperature and conductivity. The biodiversity of the gastropods and bivalves from Martín García Island amounts to up to 26 species. Among the Gastropoda, the Planorbidae family made the most sizeable contribution. The Lithogliphidae P. agapetus (26.28% and P. buschii (9.50% showed the highest relative frequencies of occurrence within the littoral environments, while the Planorbidae D. cimex (23.83% and D. kermatoides (11.59% likewise did so in the inland ponds.A Ilha de Martín García está localizada na parte alta do Rio de la Plata, ao sul da desembocadura do Rio Uruguay. Este estudo tem como objetivo analisar a biodiversidade dos moluscos de água doce da ilha e sua relação com variáveis ambientais. Doze pontos de amostragem foram selecionados: cinco foram ao longo da seção litoral da ilha e sete em lagunas interiores. Sete variáveis ambientais foram medidas: temperatura da água e do ar, porcentagem de saturação de oxigênio, oxigênio dissolvido, condutividade elétrica, sólidos totais dissolvidos e pH. Vinte e seis espécies de moluscos foram encontrados: Antillorbis nordestensis, Drepanotrema kermatoides, D. cimex, D. depressissimum, Biomphalaria tenagophila tenagophila, B. t. guaibensis, B. straminea, B. peregrina, Chilina fluminea, C. rushii, C. megastoma, Uncancylus concentricus, Hebetancylus moricandi, Stenophysa marmorata, Heleobia piscium, H. parchappii, Potamolithus agapetus, P. buschii, P. lapidum, Pomacea canaliculata, P. megastoma, Asolene platae, Corbicula fluminea, Eupera platensis, Pisidium sterkianum, P. taraguyense e Limnoperna fortunei. A análise de agrupamento das espécies com base em sua ocorrência em diferentes condições ecológicas revelou dois grupos principais de espécies. A Análise de Correspondência Canônica sugere que a distribuição das espécies é relacionada com a condição físico-química da água. No eixo dois do diagrama de ordenação apresentado, há cerca de 96% de correlação entre as espécies e as variáveis ambientais. O oxigênio dissolvido, a condutividade, a temperatura da água e pH apresentaram as maiores oscilações durante o período de amostragem. A riqueza de espécies (S apresentou relações principalmente com a temperatura da água e a condutividade. A biodiversidade de gastrópodes e bivalves da Ilha Martín García é de 26 espécies. Entre os Gastropoda, a família Pl

  7. Mollusks (Gastropoda and Bivalvia) of the Multiple-Use Reserve Martín García Island, Río de la Plata River: biodiversity and ecology / Moluscos (Gastropoda e Bivalvia) da Reserva Natural de Usos Múltiplos Ilha Martín García, Rio de La Plata: biodiversidade e ecologia

    Scientific Electronic Library Online (English)

    II, César; SM, Martín; A, Rumi; M, Tassara.

    2012-02-01

    Full Text Available A Ilha de Martín García está localizada na parte alta do Rio de la Plata, ao sul da desembocadura do Rio Uruguay. Este estudo tem como objetivo analisar a biodiversidade dos moluscos de água doce da ilha e sua relação com variáveis ambientais. Doze pontos de amostragem foram selecionados: cinco fora [...] m ao longo da seção litoral da ilha e sete em lagunas interiores. Sete variáveis ambientais foram medidas: temperatura da água e do ar, porcentagem de saturação de oxigênio, oxigênio dissolvido, condutividade elétrica, sólidos totais dissolvidos e pH. Vinte e seis espécies de moluscos foram encontrados: Antillorbis nordestensis, Drepanotrema kermatoides, D. cimex, D. depressissimum, Biomphalaria tenagophila tenagophila, B. t. guaibensis, B. straminea, B. peregrina, Chilina fluminea, C. rushii, C. megastoma, Uncancylus concentricus, Hebetancylus moricandi, Stenophysa marmorata, Heleobia piscium, H. parchappii, Potamolithus agapetus, P. buschii, P. lapidum, Pomacea canaliculata, P. megastoma, Asolene platae, Corbicula fluminea, Eupera platensis, Pisidium sterkianum, P. taraguyense e Limnoperna fortunei. A análise de agrupamento das espécies com base em sua ocorrência em diferentes condições ecológicas revelou dois grupos principais de espécies. A Análise de Correspondência Canônica sugere que a distribuição das espécies é relacionada com a condição físico-química da água. No eixo dois do diagrama de ordenação apresentado, há cerca de 96% de correlação entre as espécies e as variáveis ambientais. O oxigênio dissolvido, a condutividade, a temperatura da água e pH apresentaram as maiores oscilações durante o período de amostragem. A riqueza de espécies (S) apresentou relações principalmente com a temperatura da água e a condutividade. A biodiversidade de gastrópodes e bivalves da Ilha Martín García é de 26 espécies. Entre os Gastropoda, a família Planorbidae exibe a contribuição mais importante. O Lithogliphidae P. agapetus. (26,28%) e P. buschii (9,50%) apresentaram as maiores frequências relativas de ocorrência dentro dos ambientes costeiros, enquanto o Planorbidae D. cimex (23,83%) e D. kermatoides (11,59%) também apresentaram frequências expressivas nas lagunas interiores. Abstract in english The Island of Martin Garcia is located in the Upper Río de la Plata, to the south of mouth the Uruguay River. The aim of the present study was to analyse the biodiversity of the island freshwater mollusks and their relationships to environmental variables. Twelve sampling sites were selected, five w [...] ere along the littoral section of the island and seven were Inland ponds. Seven major environmental variables were measured: water and air temperature, percentage of oxygen saturation, dissolved oxygen, electrical conductivity, total dissolved solids and pH. Twenty-seven mollusk species were found, Antillorbis nordestensis, Biomphalaria tenagophila tenagophila , B. t. guaibensis, B. straminea, B. peregrina, Drepanotrema kermatoides, D. cimex, D. depressissimum, Chilina fluminea, C. rushii, C. megastoma, Uncancylus concentricus, Hebetancylus moricandi, Stenophysa marmorata, Heleobia piscium, H. parchappii, Potamolithus agapetus, P. buschii, P. lapidum, Pomacea canaliculata, P. megastoma, Asolene platae, Corbicula fluminea, Eupera platensis, Pisidium sterkianum, P. taraguyense and Limnoperna fortunei. UPGMA clustering of species based on their occurrence in different ecological conditions revealed two main species groups. The Canonical Correspondence Analysis suggests that the species distribution is related to the physico-chemical condition of water. Axis two of the ordination diagram displayed the approximately 95.6% of the correlation between species and environmental variables. Dissolved oxygen, conductivity, water temperature and pH showed the highest fluctuations during the sampling period. The species richness (S) showed relationships mainly with water temperature and conductivity. The biodiversity of the gastropods and bivalves from Martín

  8. Scientific Opinion on the evaluation of the pest risk analysis on Pomacea insularum, the island apple snail, prepared by the Spanish Ministry of Environment and Rural and Marine Affairs : Scientific Opinion, EFSA Panel on Plant Health (PLH)

    DEFF Research Database (Denmark)

    Baker, R.; Candresse, T.

    2012-01-01

    The Panel considers the Spanish pest risk analysis (PRA) to be clear and to provide appropriate supporting evidence. However, (i) the environmental impact assessment is incomplete and (ii) the estimates for the potentially endangered area are too limited. The Panel points out that large areas of the European Union have climatic conditions, that are very similar to those of the areas of native distribution of Pomacea spp. snails, and suitable host plants are available. The Panel agrees with the Spanish PRA on the following points with regard to the risk assessment area: (i) the potential consequences of the organism for rice crops are major; (ii) the probability for establishment of the organism is very likely and (iii) the probability of spread is estimated as likely. The Panel disagrees with the Spanish PRA on the following points and considers (i) the effects on the environment to be massive under suitable environmental conditions in the PRA area and (ii) the probability of entry of the organism to be high.Regarding risk reduction options the Panel agrees with the Spanish PRA that no single risk reduction method is sufficient to halt the introduction and spread of Pomacea spp. snails in the PRA area. However, a legislative ban on import of Pomacea spp. is the only risk reduction option identified that can reduce the probability of entry. The many other risk reduction options listed will help to reduce the probability of spread within the PRA area. The Panel considers that the risk reduction options should target the canaliculata complex, as Pomacea insularum and P. canaliculata, as well as other species from the complex, are almost indistinguishable. This is of particular importance for risk reduction options addressing both breeding and trade of the organism.

  9. Effect of temperature on the predation rate of the pearl cichlid (Geophagus brasiliensis) on the channeled applesnail (Pomacea canaliculata) / Efecto de la temperatura en la tasa de depredación de la castañeta (Geophagus brasiliensis) sobre el caracol manzana (Pomacea canaliculata)

    Scientific Electronic Library Online (English)

    Ariany, Rabello da Silva; Mário Roberto, Chim Figueiredo.

    1056-10-01

    Full Text Available Se realizó un experimento para evaluar el efecto de la temperatura sobre la intensidad de depredación de caracoles. Las pruebas experimentales se realizaron durante 60 días, dentro de 15 estanques de cemento llenas con agua a diferentes temperaturas, 18, 22, 26, 30 y 34°C, en un diseño de distribuci [...] ón completamente aleatorio, con tres réplicas. Las castañetas (n = 4 por estanque) fueron distribuidas en estanques con calentadores, lo que aumentó la temperatura del agua en 1°C h-1, en una habitación a 17°C. También, se seleccionaron los caracoles (hasta 3 mm) y fueron distribuidos en los estanques (n = 32 por estanque). El período de exposición a la depredación fue de 18 h, observándose que, el índice de depredación fue significativamente inferior a una temperatura de 18°C, mientras que a temperaturas entre 26 y 34°C no se encontraron diferencias significativas. Se concluye que las castañetas se alimentan de manera eficiente de los caracoles a temperaturas de 26°C o más. Abstract in english An experiment was conducted to evaluate the effect of temperature on the intensity of predation upon snails. The experiment was run for 60 days using 15 cement tanks with water temperatures of 18, 22, 26, 30 and 34°C in a completely randomized design with three replications. The pearl cichlids (n = [...] 4 per tank) were distributed in tanks with heaters, which increased the water temperature by 1°C h-1, in a room held at 17°C. The snails were selected (up to 3 mm) and distributed among the tanks (n = 32 per tank). The period of exposure to predation was 18 h, and the index of predation was significantly lower at 18°C. Temperatures between 26 and 34 did not result in significant differences in predation. It was conclude that the pearl cichlids prey efficiently on snails at temperatures of 26°C and above.

  10. Inhibition of Acetylcholinesterase Activity in the Golden Apple Snail (Pomacea canaliculata Lamarck) Exposed to Chlorpyrifos, Dichlorvos or Carbaryl Insecticides

    OpenAIRE

    Sunisa Putkome; Voravit Cheevaporn

    2008-01-01

    Long-acting inhibitors of acetylcholinesterase (AChE) are used in large amounts as insecticides in agriculture, and are thereby introduced into the evironment. By incubating golden apple snails in chlorpyrifos, dichlorvos, or carbaryl, we determined the LD50’s to 3.7, 4.5 and 49 µM, respectively. AChE activities were measured in several organs; the highest activity was found in the gills. Following incubation in either of the three insecticides, the ED50’s for AChE inhibition in the gill...

  11. Inhibition of Acetylcholinesterase Activity in the Golden Apple Snail (Pomacea canaliculata Lamarck Exposed to Chlorpyrifos, Dichlorvos or Carbaryl Insecticides

    Directory of Open Access Journals (Sweden)

    Sunisa Putkome

    2008-07-01

    Full Text Available Long-acting inhibitors of acetylcholinesterase (AChE are used in large amounts as insecticides in agriculture, and are thereby introduced into the evironment. By incubating golden apple snails in chlorpyrifos, dichlorvos, or carbaryl, we determined the LD50’s to 3.7, 4.5 and 49 µM, respectively. AChE activities were measured in several organs; the highest activity was found in the gills. Following incubation in either of the three insecticides, the ED50’s for AChE inhibition in the gills were 0.37 µM, 0.22 µM, and 14 µM, respectively; there were no sex differences, but AChE inhibition was more marked in larger snails than in smaller ones, and incubation at 32 °C brought about a higher AChE inhibition than at 27 °C. The time course of AChE inhibition was studied in snails incubated at ED50 with either of the inhibitors. There was a 50% enzyme inhibition after about 6 min, 5 min, and 7 min, respectively. After 96 h incubation, enzyme inhibiton reached about 90% in all three groups. Following this exposure to inhibitor, the snails were transferred to fresh water; after 30 days there was virtually no recovery of AChE actvity in the snails exposed to chlorpyrifos or dichlorovos, whereas about 20% was recovered in snails exposed to carbaryl.

  12. Desarrollo morfológico e histológico del sistema reproductor de Pomacea patula catemacensis (Baker 1922) (Mollusca, Caenogastropoda: Ampullariidae) / Morphological and histological development of the reproductive system of Pomacea patula catemacensis (Baker 1922) (Mollusca, Caenogastropoda: Ampullariidae)

    Scientific Electronic Library Online (English)

    AURA, CARREÓN-PALAU; ESTHER, URIA-GALICIA; FÉLIX, ESPINOSA-CHÁVEZ; FERNANDO, MARTÍNEZ-JERÓNIMO.

    2003-12-01

    Full Text Available El "tegogolo" Pomacea patula catemacensis es un gasterópodo dulceacuícola comestible, endémico del Lago de Catemaco en Veracruz, México. En los últimos años las poblaciones naturales se han visto diezmadas debido a que su captura se realiza sin control, a lo que se suma el alto grado de deterioro am [...] biental que presenta el lago, producto del "azolvamiento", así como por la contaminación por plaguicidas y detergentes. El objetivo del presente estudio fue caracterizar histológica y morfológicamente el sistema reproductor de P. patula catemacensis y determinar las etapas de madurez gonádica en condiciones de laboratorio. Se determinó que la maduración depende de la talla y no de la edad de los organismos, y se identificaron cuatro etapas principales en el desarrollo de machos y hembras: Los estadios y sus longitudes promedio ± intervalo de confianza del 95 %) son (1) inmadura o indiferenciada (talla de 0,72 a 7 mm), (2) maduración temprana (18,95 ± 1,96 mm), (3) maduración intermedia (29,29 ± 4,9 mm) y (4) madurez total (35,89 ± 3,92 mm). En este molusco los sexos están separados, la fertilización es interna y el desarrollo es ovovivíparo. En las hembras la secreción de albúmina y de carbonato de calcio se realiza en la glándula de la albúmina, característica en la que difiere de otras especies como P. paludosa y P. canaliculata, las cuales poseen además glándula de la cápsula. Es posible identificar el grado de madurez de los caracoles utilizando criterios anatómicos visuales, como la glándula de la albúmina, en el caso de la hembra, y el órgano copulador en el macho Abstract in english The "apple snail" Pomacea patula catemacensis is an edible freshwater mollusc, endemic to the Catemaco Lake in Veracruz, Mexico. During the past few years, the natural populations of this species have been depleted mainly by uncontrolled fishery, and because of environmental degradation and pollutio [...] n by pesticides and detergents. In the present study, we carried out the histological and morphological characterization of the reproductive system of P. patula catemacensis under laboratory conditions. We found that the reproductive development of this snail depended more on the size than on the age the animals, and identified four development main stages, both for males and females. The main stages and their mean lengths ± confidence interval at P

  13. Desarrollo morfológico e histológico del sistema reproductor de Pomacea patula catemacensis (Baker 1922 (Mollusca, Caenogastropoda: Ampullariidae Morphological and histological development of the reproductive system of Pomacea patula catemacensis (Baker 1922 (Mollusca, Caenogastropoda: Ampullariidae

    Directory of Open Access Journals (Sweden)

    AURA CARREÓN-PALAU

    2003-12-01

    Full Text Available El "tegogolo" Pomacea patula catemacensis es un gasterópodo dulceacuícola comestible, endémico del Lago de Catemaco en Veracruz, México. En los últimos años las poblaciones naturales se han visto diezmadas debido a que su captura se realiza sin control, a lo que se suma el alto grado de deterioro ambiental que presenta el lago, producto del "azolvamiento", así como por la contaminación por plaguicidas y detergentes. El objetivo del presente estudio fue caracterizar histológica y morfológicamente el sistema reproductor de P. patula catemacensis y determinar las etapas de madurez gonádica en condiciones de laboratorio. Se determinó que la maduración depende de la talla y no de la edad de los organismos, y se identificaron cuatro etapas principales en el desarrollo de machos y hembras: Los estadios y sus longitudes promedio ± intervalo de confianza del 95 % son (1 inmadura o indiferenciada (talla de 0,72 a 7 mm, (2 maduración temprana (18,95 ± 1,96 mm, (3 maduración intermedia (29,29 ± 4,9 mm y (4 madurez total (35,89 ± 3,92 mm. En este molusco los sexos están separados, la fertilización es interna y el desarrollo es ovovivíparo. En las hembras la secreción de albúmina y de carbonato de calcio se realiza en la glándula de la albúmina, característica en la que difiere de otras especies como P. paludosa y P. canaliculata, las cuales poseen además glándula de la cápsula. Es posible identificar el grado de madurez de los caracoles utilizando criterios anatómicos visuales, como la glándula de la albúmina, en el caso de la hembra, y el órgano copulador en el machoThe "apple snail" Pomacea patula catemacensis is an edible freshwater mollusc, endemic to the Catemaco Lake in Veracruz, Mexico. During the past few years, the natural populations of this species have been depleted mainly by uncontrolled fishery, and because of environmental degradation and pollution by pesticides and detergents. In the present study, we carried out the histological and morphological characterization of the reproductive system of P. patula catemacensis under laboratory conditions. We found that the reproductive development of this snail depended more on the size than on the age the animals, and identified four development main stages, both for males and females. The main stages and their mean lengths ± confidence interval at P < 0.05 were (1 immature or not differenced (from 0.72 to 7 mm, (2 early maturation (from 18.95 ± 1.96 mm, (3 intermediate maturation (from 29.29 ± 4.9 mm, and (4 full maturity (from 35.89 ± 3.92 mm. This species is ovoviviparous, both sexes are separated, and fertilization is internal. Albumin and calcium carbonate secretion in females are performed through the albumin gland, a trait that distinguishes this species from others, such as P. paludosa and P. canaliculata. The stage of development can be identified by means of using anatomical traits, such as the albumin gland (in the case of females, or the intromittent organ (in males

  14. RESPIRATORY METABOLISM OF THE AMPHYBIOUS MOLLUSC Pomacea lineata (SPIX, 1827: INFLUENCE OF ALIMENTARY CONDITION ON THE OXYGEN CONSUMPTION OF WHOLE ANIMAL AND ITS RADULAR MUSCLE = METABOLISMO RESPIRATÓRIO DO MOLUSCO ANFÍBIO Pomacea lineata (SPIX, 1827: INFLUÊNCIA DA CONDIÇÃO ALIMENTAR NO CONSUMO DE OXIGÊNIO DO ANIMAL TOTAL E DE SEU MÚSCULO RADULAR

    Directory of Open Access Journals (Sweden)

    Gláucia Maria Tech dos Santos

    2002-01-01

    Full Text Available The present work aimed to investigate the respiratory metabolism of the amphibious gastropoda Pomacea lineata, and to measure the oxygen-consumption of both whole animal and its radular muscle in different alimentary conditions (whether fed or starved. The species is interesting in a physioecologic aspect, because it is an important snail as a bioindicator of ecosystem quality. It was observed that respiratory metabolism obtained from respiratory rate variation was significantly reduced (P< 0,05 under starvation effect in the whole animals (0,473 in whether fed and 0,317 in starved, as well as in the respective radular muscles (0,884 in whether fed and 0,521 in starved. The respiratory rate average of the radular muscles was significantly greater (P<0,05 than respiratory rate average of the whole animals (whether fed and starved as a result of the myoglobin quantity from these muscles. These results are in accordance with the morphofunctional characteristics of P. lineata. Its radular muscle works out actively for getting feed and constitutes the animal scraping bucal organ . This muscle needs enormous quantity of oxygen obtained from water or air environment, in order to justify the important role played for these amphibious gastropoda as a bioindicator of ecosystem quality. = A finalidade do presente trabalho foi estudar o metabolismo respiratório de Pomacea lineata, um gastrópode anfíbio, e determinar o consumo de oxigênio do animalinteiro e seu respectivo músculo radular em diferentes condições alimentares (jejunos e alimentados. Essa espécie é interessante no seu aspecto fisioecológico, pois trata-se de um molusco importante como bioindicador da qualidade de um ecossistema. Verificou-se que o metabolismo respiratório, estimado em termos de variação da taxa respiratória, diminuiu significativamente (P < 0,05 sob o efeito de jejum nos animais inteiros (0,473 nos alimentados e 0,317 nos jejunos, assim como nos respectivos músculos radulares (0,884 nos alimentados e 0,521 nos jejunos. A taxa respiratória média dos músculos radulares foi significativamente maior (P < 0,05, que a taxa respiratória média dos animais inteiros (alimentados e jejunos devido à grande quantidade de mioglobina presente nesses músculos.Os resultados obtidos estão em conformidade com as característicasmorfofuncionais de P. lineata. Seu músculo radular é usado ativamente na obtenção do alimento e faz parte do órgão raspador do animal. Esse músculo necessita de grandes quantidades de oxigênio que o animal retira da água ou do meio aéreo, justificando a posição destacada desse gastrópodo anfíbio como bioindicador da qualidade de umecossistema.

  15. Diospyrone, a new coumarinylbinaphthoquinone from Diospyros canaliculata (Ebenaceae: structure and antimicrobial activity

    Directory of Open Access Journals (Sweden)

    J.G. Tangmouo

    2005-06-01

    Full Text Available A new binaphthoquinone bearing two 4-hydroxy-5-methylcoumarin-3-yl units has been isolated from the stem bark of Diospyros canaliculata De Wildeman in addition to five known compounds: lupenone, betulinic acid, gerberinol, plumbagin and canaliculatin. Their structures were established on the basis of 1D (1H, 13C and DEPT and 2D (1H-1H COSY, HMQC and HMBC NMR experiments. Some of the above compounds showed a significant antimicrobial activity against bacteria and yeasts.

  16. Assessment of Toxic Metals and feed habits of the snail Pomacea specie from the Amatitlan Lake

    International Nuclear Information System (INIS)

    In the present thesis an assesment of cadmium, cooper, cromium VI, and lead was made in samples of snail pomacea specie from the Amatitlan Lake. We conclude that the comsuption of this mollusk is toxic for human health. The concentration of heavy metals like cadmium, cooper shows that are not recomended for human comsuption according to Spanish and FAO/PAHO standards

  17. Assessment of Nutrient Value and Microbiological Safety of Pomacea lineata.

    Science.gov (United States)

    Pessôa, Hilzeth de Luna Freire; da Conceição, Maria Lúcia; da Paz, Andrea Maria Rolim; da Silva, Bagnólia Araújo; Costa, Maria José de Carvalho

    2015-07-01

    Pomacea lineata is a fresh water shellfish that is utilized as food, medicinal portions, or licking remedies. The objective of this study was to evaluate the nutritional and microbiological aspects of P. lineata and spawning. The samples were collected in the Jaguaribe River (Paraíba, Brazil) during the rainy and dry seasons. The biochemical composition, mineral composition, total mesophilic bacteria (TMB), total coliforms (TC), fecal coliforms (FC), Salmonella sp., Staphylococcus aureus, and Vibrio presence were determined. Each 100?g of P. lineata presented 3.1?g of ashes; 9.4?g of proteins; 2.7?g of lipids; 0.6?g of carbohydrates; 1800.0?mg of calcium; 78.0?mg of phosphorus, and 58.4?mg of iron. Each 100?g of spawning presented 10.4?g of ashes; 4.5?g of proteins; 2.8?g of lipids; 1.3?g of carbohydrates; 3633.0?mg of calcium; 39.4?mg of phosphorus; and 4.6?mg of iron. Each 100?g of P. lineata provided 65.7?kcal and spawning 48.3?kcal. In the dry season P. lineata and spawning showed no TMB and TC, FC, S. aureus, Salmonella, or Vibrio. In the rainy season P. lineata and spawning presented increase in TMB and TC, FC, S. aureus, and Salmonella. The presence of Vibrio was not detected. P. lineata presented proteins, low lipid, and carbohydrate content, energy values close to those of lean meats, high contents of calcium and iron, and presented low contamination level with pathogenic bacteria. Since P. lineata substances may be useful in the treatment of respiratory and gastrointestinal diseases without presenting toxic or cytotoxic effects already described in the literature, it may be considered as a potential functional food. PMID:25602497

  18. Karyological and electrophoretic differences between Pomacea flagellata and P. patula catemacensis: Caenogastropoda: Ampullariidae

    Scientific Electronic Library Online (English)

    María Esther, Diupotex-Chong; Néstor J, Cazzaniga; Manuel, Uribe-Alcocer.

    2007-12-01

    Full Text Available The widespread Mexican apple snail Pomacea flagellata (Say 1827) and the strictly endemic "tegogolo" P. patula catemacensis (Baker 1922) (restricted to Lake Catemaco), are the only known American Ampullariidae that have haploid complements n=13. Pomacea patula catemacensis has suffered a critical re [...] duction in abundance due to immoderate fishing for human consumption. Chromosome slides were obtained from colchicine-injected Pomacea snails collected from nine locations along the coastal zone of the Gulf of Mexico, including Lake Catemaco, for use in principal component analysis (PCA). Total proteins in foot homogenates were analyzed through isoelectric focusing (IEF) and native-PAGE electrophoresis on polyacrylamide gels. The chromosome number 2n=26 was confirmed for snails from all locations, with a uniform 9 m + 4 sm formula. However, P. patula catemacensis showed significantly larger chromosomes (absolute size) than any population of P. flagellata. Pomacea patula catemacensis also differed from all populations of P. flagellata in a PCA with standardized data, i.e., independently of the absolute size difference between species. Proteins with an acid isoelectric point were dominant in the foot of both species. The electrophoresis analysis showed that P. flagellata has 17 protein bands, with an upper bound at IEF=7.6, while P. patula catemacensis has only 15 bands, with an upper bound at IEF=7 and a more evenly spaced band pattern. Molecular weights ranged from 40 to approximately 130 kDa in both species. Proteins with high values (>94 kDa) were the most abundant. Pomacea patula catemacensis showed a band of 93 kDa, which was absent from all specimens of P. flagellata. Samples of P. flagellata did not cluster according to any geographical pattern in the statistical analyses, nor did they show any taxonomically useful differences in their electrophoretic patterns that merit sub-specific discrimination.

  19. Genome Sequence of the Ethanol-Producing Zymomonas mobilis subsp. pomaceae Lectotype Strain ATCC 29192?

    OpenAIRE

    Kouvelis, Vassili N.; Davenport, Karen W.; Brettin, Thomas S.; Bruce, David; Detter, Chris; Han, Cliff S.; Nolan, Matt; Tapia, Roxanne; Damoulaki, Agni; Kyrpides, Nikos C.; Typas, Milton A.; Pappas, Katherine M.

    2011-01-01

    Zymomonas mobilis is an alphaproteobacterium studied for bioethanol production. Different strains of this organism have been hitherto sequenced; they all belong to the Z. mobilis subsp. mobilis taxon. Here we report the finished and annotated genome sequence of strain ATCC 29192, a cider-spoiling agent isolated in the United Kingdom. ATCC 29192 is the lectotype of the second-best-characterized subspecies of Z. mobilis, Z. mobilis subsp. pomaceae. The nucleotide sequence of ATCC 29192 deviates...

  20. Gender-based differences in Florida apple snail (Pomacea paludosa) movements

    Science.gov (United States)

    Valentine-Darby, P. L.; Darby, P.C.; Percival, H.F.

    2011-01-01

    Gastropod movements have been studied in the context of habitat selection, finding food and mates, and avoiding predation. Many of these studies were conducted in the laboratory, where constraints on spatial scale influence behavior. We conducted a field study of Florida apple snail (Pomacea paludosa) movements using telemetry. We hypothesized that Florida apple snail movements were driven by reproductive activity, and that gender differences would be evident. We documented male and female directions and distances traveled. We also conducted a trapping study that included conspecific bait to test if the presence of females attracted more males as measured by M:F ratios in traps. The greatest distances traveled were by males, and males were more likely to maintain a consistent bearing compared to females. Male distances peaked in what typically corresponds to peak breeding season. M:F ratios in traps were positively associated with reproductive activity in the study population as measured by egg cluster counts. Conspecific bait had no effect on the number of males or females captured. However, if a female crawled into the trap, we observed greater numbers of males compared to those with no trapped females. Males may have tracked females to increase mating encounters, following slime trails, as seen in other aquatic (including other Pomacea) snails. The capacity for mate finding has implications for reproductive success in the relatively low density populations often seen for Pomacea paludosa.

  1. Queue up, please! Spermathecal filling in the rove beetle Drusilla canaliculata (Coleoptera, Staphylinidae).

    Science.gov (United States)

    Werner, Michael; Gack, Claudia; Speck, Thomas; Peschke, Klaus

    2007-10-01

    Most studies on insect sperm motility have been conducted in vitro using artificial environments outside the animal's body. Only little is known about the function of motile insect sperm at different sites within the male or female genital tracts. We dissected genital tracts of female rove beetles (Drusilla canaliculata) to show that spermatozoa use their own motility to migrate from the spermatophore into the spermatheca. Our dissection method allowed direct observation and filming of the spermathecal filling process inside the female's genital tract. Spermatozoa were found to enter the spermatheca individually, sometimes in groups of two or three. Although exhibiting only weak motility and no progressive motion in buffer solution, the spermatozoa inside the female show vigorous lashing and reach an average velocity of 47.5 microm s(-1). To gain mobility and speed, the spermatozoa likely utilize the relatively small diameter of the spermathecal duct to push themselves off the duct walls, rather than swimming freely in seminal fluid. The spermatozoa (approximately 1,250 microm) are considerably longer than the distance they have to travel along the spermathecal duct (approximately 800 microm). Our study provides the first direct observation of active sperm migration within the female of an insect stressing the importance of the genital tract as a prerequisite for functional sperm motility. PMID:17508193

  2. Subulina octona (Bruguière, 1798) – a new greenhouse species for the Czech Republic (Mollusca: Gastropoda: Subulinidae)

    OpenAIRE

    Lucie Ju?i?ková

    2006-01-01

    The occurrence of land snail Subulina octona (Bruguière 1798) (Gastropoda: Subulinidae) is reported from the Czech Republic greenhouse for the first time. Molluscan communities of two new Bohemian greenhouses are characterized.

  3. Redescription of Temnocephala iheringi (Platyhelminthes: Temnocephalida) based on specimens from Pomacea canaliculata (Mollusca: Ampullariidae) of the state of Rio Grande do Sul, Brazil: the possible type host and type locality

    OpenAIRE

    Samantha A. Seixas; José F. R. Amato; Suzana B Amato

    2010-01-01

    The original description of Temnocephala iheringi Haswell, 1893 was based on specimens collected by Hermann von Ihering from undetermined ampullariid apple snails, which at that time were identified as Ampullaria sp., and sent to William H. Haswell, with the type locality simply indicated as Brazil. The type specimens studied by Haswell were not found in the scientific collections of Brazil, Europe or Australia, and should be considered lost. In 1941, Pereira & Cuocolo collected specimens fro...

  4. Ocorrência de Lymnaea columella (Gastropoda: Lymnaeidae), hospedeiro intermediário da Fasciola hepatica, para o Estado da Paraíba, Brasil Occurrence of Lymnaea columella (Gastropoda: Lymnaeidae), first intermediate host of Fasciola hepatica, for the state of Paraíba, Brazil

    OpenAIRE

    Francisco José Pegado Abílio; Takako Watanabe

    1998-01-01

    Foi registrada a ocorrência de Lymnaea columella (Gastropoda: Lymnaeidae), primeiro hospedeiro intermediário da Fasciola hepatica, para o Estado da Paraíba, Brasil, associado a macrófitas aquáticas.The occurrence of Lymnaea Columella (Gastropoda: Lymnaeidae), first intermediate host of Fasciola hepatica, is recorded for the first time in the state of Paraíba, Brazil, associeted with aquatic macrophytes.

  5. Dry down impacts on apple snail (Pomacea paludosa) demography: Implications for wetland water management

    Science.gov (United States)

    Darby, P.C.; Bennetts, R.E.; Percival, H.F.

    2008-01-01

    Florida apple snails (Pomacea paludosa Say) are prey for several wetland-dependent predators, most notably for the endangered Florida snail kite (Rostrhamus sociabilis Vieillot). Management concerns for kites have been raised regarding the impacts of wetland dry downs on snails, but little data exists to validate these concerns. We simulated drying events in experimental tanks, where we observed that snail survival patterns, regardless of hydrology, were driven by a post-reproductive die off. In contrast to earlier reports of little to no dry down tolerance, we found that 70% of pre-reproductive adult-sized snails survived a 12-week dry down. Smaller size classes of snails exhibited significantly lower survival rates (apple snail populations, and illustrate why multiple characteristics of dry down events should be considered in developing target hydrologic regimes for wetland fauna. ?? 2008, The Society of Wetland Scientists.

  6. Check list of the Bulgarian minor freshwater snails (Gastropoda: Risooidea with some ecological and zoogeographical notes

    Directory of Open Access Journals (Sweden)

    DILIAN GEORGIEV

    2011-08-01

    Full Text Available A synopsis and critical overview of all the literature on the freshwater minor snails (Gastropoda: Risooidea of Bulgaria was made. A check list of 49 species known till now in the country with the ecological and zoogeorgraphical categories to which the species belong was provided.

  7. Spatial and temporal structure of the trematode component community in Valvata macrostoma (Gastropoda, Prosobranchia).

    Czech Academy of Sciences Publication Activity Database

    Faltýnková, Anna; Valtonen, E. T.; Karvonen, A.

    2008-01-01

    Ro?. 135, ?. 14 (2008), s. 1691-1699. ISSN 0031-1820 R&D Projects: GA ?R GP524/07/P086 Institutional research plan: CEZ:AV0Z60220518 Keywords : community ecology * spatiotemporal dynamics * Trematoda * Gastropoda * Valvata macrostoma Subject RIV: GJ - Animal Vermins ; Diseases, Veterinary Medicine Impact factor: 2.071, year: 2008

  8. Activation of violaxanthin cycle in darkness is a common response to different abiotic stresses: a case study in Pelvetia canaliculata

    Directory of Open Access Journals (Sweden)

    Fernández-Marín Beatriz

    2011-12-01

    Full Text Available Abstract Background In the violaxanthin (V cycle, V is de-epoxidized to zeaxanthin (Z when strong light or light combined with other stressors lead to an overexcitation of photosystems. However, plants can also suffer stress in darkness and recent reports have shown that dehydration triggers V-de-epoxidation in the absence of light. In this study, we used the highly stress-tolerant brown alga Pelvetia canaliculata as a model organism, due to its lack of lutein and its non-photochemical quenching independent of the transthylakoidal-?pH, to study the triggering of the V-cycle in darkness induced by abiotic stressors. Results We have shown that besides desiccation, other factors such as immersion, anoxia and high temperature also induced V-de-epoxidation in darkness. This process was reversible once the treatments had ceased (with the exception of heat, which caused lethal damage. Irrespective of the stressor applied, the resulting de-epoxidised xanthophylls correlated with a decrease in Fv/Fm, suggesting a common function in the down-regulation of photosynthetical efficiency. The implication of the redox-state of the plastoquinone-pool and of the differential activity of V-cycle enzymes on V-de-epoxidation in darkness was also examined. Current results suggest that both violaxanthin de-epoxidase (VDE and zeaxanthin-epoxidase (ZE have a basal constitutive activity even in darkness, being ZE inhibited under stress. This inhibition leads to Z accumulation. Conclusion This study demonstrates that V-cycle activity is triggered by several abiotic stressors even when they occur in an absolute absence of light, leading to a decrease in Fv/Fm. This finding provides new insights into an understanding of the regulation mechanism of the V-cycle and of its ecophysiological roles.

  9. Cargols terrestres (Gastropoda, Stylommatophora) del Parc Natural de la Muntanya de Montserrat (Barcelona, NE península ibèrica)

    OpenAIRE

    Bros, V.

    2006-01-01

    Land snails (Gastropoda, Stylommatophora) in the Natural Park of Montserrat (Barcelona, NE Iberian peninsula) The inventory of 73 land snails in the Natural Park of Montserrat was updated following the review of 130 publications. Planned field study was also conducted in areas of different habitats on the Montserrat mountain to provide a preliminary description of the communities of land snails in the study area. A total of 342 samples of land snails were studied and 50 species were identi...

  10. Presence of argyrophilic cytoplasmic and nuclear proteins in the spermatic cells of Nucella lapillus (Gastropoda, Prosobranchia).

    Science.gov (United States)

    Azevedo, C; Oliveira, E

    1988-01-01

    The technique for ultrastructural localization of argyrophilic proteins was modified and NOR-Silver staining methods were applied to the study of the distribution of these proteins in the spermatic cells of Nucella lapillus (Gastropoda, Prosobranchia). Two types of selective silver deposits were found during the different phases of spermiogenesis and in mature spermatozoa. Argyrophilic nuclear, nucleolar and cytoplasmic proteins were simultaneously detected by improvement of a modified one-step silver technique. PMID:2453266

  11. Applying weight gain in Pomacea lineata (Spix 1824) (Mollusca: Prosobranchia) as a measure of herbicide toxicity / Aplicando o ganho de peso em Pomacea lineata (Spix, 1824) (Mollusca: Prosobranchia) como uma medida de toxicidade a herbicida

    Scientific Electronic Library Online (English)

    R. A., Coler; R. R., Coler; E. K. G., Felizardo; T., Watanabe.

    2005-11-01

    Full Text Available Pomacea lineata, um molusco amplamente distribuído e considerado como peste em plantações de arroz no Oriente, pode ser considerado como um valioso recurso para monitorar a qualidade da água no Nordeste do Brasil. Neste trabalho, apresentamos dados que demonstram que o incremento de peso em moluscos [...] neonatos é uma medida consistente que responde eficientemente ao estresse imposto por concentrações tóxicas subletais dos herbicidas Paraquat e Round-up. Os resultados de crescimento para avaliar a toxicidade crônica foram obtidos em experimentos de quatro e quatro, oito, doze e dezesseis dias para Paraquat e Round-up, respectivamente. A maior concentração de efeito não observado (NOEC) e a menor concentração de efeito observado (LOEC) para Paraquat, após 96 horas, foram respectivamente de 0,12 e 0,25 mg/L. Para o Round-up, os valores de NOEC e LOEC estimados foram respectivamente de 0,25 e 0,5 mg/L. Todas as concentrações de Round-up testadas após 192 horas de exposição provocaram diminuições nas taxas de crescimento, sendo significativamente diferentes do controle. Conseqüentemente não pode ser estimado o valor de NOEC. O valor de LOEC foi menor do que 0,12 mg/L. Além disso, não houve nenhuma mortalidade durante o teste. Por conseguinte, nenhum NOEC pôde ser derivado e o LOEC era Abstract in english Pomacea lineata, an extremely ubiquitous snail and pest to rice farmers throughout Asia, holds promise as a valuable resource for monitoring water quality in northeast Brazil. In this paper, we present data demonstrating the rate of weight gain in P. lineata neonates as a consistent measure of the s [...] tress imposed by sublethal concentrations of the herbicides Paraquat and Round-up. Our secondary agenda is to demonstrate the feasibility of incorporating bioassay into the standard municipal and state procedure of monitoring water quality. Growth data to assess chronic toxicity were generated in experiments of four and four, eight, twelve and sixteen days for Paraquat and Round-up, respectively. We estimated a 96 h no observed effect concentration (NOEC) and lowest observed effect concentration (LOEC) for Paraquat of 0.12 and 0.25 mg/L. The 96 h Round-up data yielded NOEC and LOEC values, respectively, of 0.25 and 0.5 mg/L. All concentrations of Round-up tested for the 192 h exposure yielded significantly lower growth than the control. Consequently, no NOEC could be derived. The LOEC was

  12. Estudio Histológico del Tubo Digestivo y Aparato Venenoso de Gemmula periscelida (Gastropoda: Turridae) / Histologic Study of Digestive Tract and Venom Apparatus of Gemmula periscelida (Gastropoda: Turridae)

    Scientific Electronic Library Online (English)

    Norma Angélica, Santibañez Aguascalientes; Esperanza, Ortíz Ordóñez; Andrés, Falcón Alcántara; Edgar P, Heimer de la Cotera.

    2013-03-01

    Full Text Available En el presente trabajo se describe anatómica e histológicamente el tubo digestivo y aparato venenoso de Gemmula periscelida (Gastropoda: Turridae) en ejemplares colectados al Noroeste de la Plataforma Continental Yucateca. Se determinó que el tipo de epitelio que reviste a cada una de las zonas del [...] tubo digestivo (probóscide, esófago anterior, medio y posterior, estómago, glándula digestiva e intestino) y al aparato venenoso, es diferente a lo reportado para otros túrridos; por lo que se infiere el posible mecanismo de alimentación para esta especie. Abstract in english In this paper we realized anatomical and histologically description of the digestive tract and venom apparatus of Gemmula periscelida (Gastropoda: Turridae) specimens collected northwest of the Yucatan Shelf. Results of analysis show that there are differences in the type of epithelium coating each [...] of the areas of the digestive tract (proboscis, anterior, middle and posterior esophagus, stomach, digestive gland and intestine) and of a venom apparatus with respect to that reported for other turrid snails. This suggests the possible feeding mechanism for this species.

  13. Avaliação da toxicidade aguda, efeitos citotóxico e espasmolítico de Pomacea lineata (Spix, 1827) (Mollusca, Caenogastropoda) / Evaluation of the acute toxicity, cytotoxic and spasmolytic effects of Pomacea lineata (Spix, 1827) (Mollusca, Caenogastropoda)

    Scientific Electronic Library Online (English)

    Hilzeth L.F., Pessôa; Rita C.M., Oliveira; Joelmir L.V., Silva; Rosimeire F., Santos; José C., Duarte; Maria J.C., Costa; Bagnólia A., Silva.

    2007-03-01

    Full Text Available Pomacea sp. e sua desova têm uso popular para tratar diarréia e doenças respiratórias. Este trabalho objetivou avaliar a toxicidade aguda e os efeitos citotóxico e espasmolítico dos liófilos de Pomacea lineata e de sua desova. Os liófilos não apresentaram toxicidade aguda (até 2 g/kg v.o.) ou efeito [...] citotóxico (até 1 mg/mL). P. lineata relaxou a traquéia pré-contraída com CCh na presença (Emax = 48,8 ± 6,4%) e na ausência (Emax = 47,3 ± 9,1%) de epitélio, já a desova relaxou apenas na presença (Emax = 36,3 ± 2,5%) de epitélio. Os liófilos foram ineficazes sobre o tônus espontâneo da traquéia. P. lineata foi mais potente em inibir as contrações do íleo induzidas por ACh (logCI50 = 2,5 ± 0,04 µg/mL) que por hist. (logCI50 = 2,7 ± 0,04 µg/mL). A desova inibiu igualmente as contrações induzidas por ACh (logCI50 = 2,5 ± 0,02 µg/mL) e hist. (logCI50 = 2,5 ± 0,06 µg/mL). P. lineata foi mais potente em relaxar o íleo pré-contraído com ACh (logCE50 = 1,7 ± 0,12 µg/mL) do que com KCl (logCE50 = 2,4 ± 0,06 µg/mL) ou hist. (logCE50 = 2,2 ± 0,18 µg/mL). A desova relaxou equipotentemente o íleo pré-contraído com KCl (logCE50 = 2,3 ± 0,15 µg/mL), ACh (logCE50 = 1,9 ± 0,14 µg/mL) ou hist. (logCE50 = 2,2 ± 0,16 µg/mL), sugerindo um bloqueio dos CaV. P. lineata e sua desova apresentam efeito espasmolítico justificando a sua utilização no tratamento de diarréia e de doenças respiratórias. Abstract in english Pomacea sp. and its eggs are used against diarrhea and respiratory diseases in folk medicine. The aim of this study was to investigate acute toxicity, cytotoxic and spasmolytic activity of lyophilized Pomacea lineata and its eggs. P. lineata and its eggs present no acute toxicity (until 2 g/kg p.o.) [...] or cytotoxic effect (until 1 mg/mL). P. lineata and its eggs have no effect on guinea-pig trachea spontaneous tonus. P. lineata relaxed trachea pre-contracted with CCh in the presence (Emax = 48.8 ± 6,4 %) and absence (Emax = 47.3 ± 9,1 %) of epithelium, the eggs relaxed only in the presence (Emax = 36.3 ± 2.5 %) P. lineata was more potent to inhibit contractions induced by ACh (logIC50 = 2.5 ± 0.04 µg/mL) than histamine (logIC50 = 2.7 ± 0.04 µg/mL). The eggs inhibited contractions induced by ACh (logIC50 = 2.5 ± 0.02 µg/mL) and histamine (logIC50 = 2.5 ± 0.06 µg/mL) in a non-selective manner. P. lineata was more potent in relax ileum pre-contracted with ACh (logEC50 = 1.7 ± 0.12 µg/mL) than KCl (logEC50 = 2.4 ± 0.06 µg/mL) or histamine (logEC50 = 2.2 ± 0.18 µg/mL). The eggs were equipotent in relax ileum pre-contracted with of KCl (logEC50 = 2.3 ± 0.15 µg/mL), ACh (logEC50 = 1.9 ± 0.14 µg/mL) or histamine (logEC50 = 2.2 ± 0.16 µg/mL), that is suggestive of the blockade of the voltage-operated calcium channels. Collectively, the results validate folk use of P. lineata and its eggs to treat diarrhea and respiratory diseases.

  14. New taxa of terrestrial molluscs from Turkey (Gastropoda, Pristilomatidae, Enidae, Hygromiidae, Helicidae

    Directory of Open Access Journals (Sweden)

    Burçin Gümüs

    2012-02-01

    Full Text Available This paper reports on results of several collecting trips of the authors in Turkey. In the course of this research, a long-lasting question was addressed. It could be proven that the nominal species Bulimus frivaldskyi L. Pfeiffer, 1847 is closely related to Meijeriella canaliculata Bank, 1985, and thus this species is shifted from the genus Ena Turton, 1831, to the genus Meijeriella Bank, 1985. Meijeriella canaliculata Bank, 1985, could be recorded from Turkey for the first time. The nomenclatural situation of the species Euchondrus septemdentatus (Roth, 1839 vs. its replacement name Euchondrus borealis (Mousson, 1874 is discussed. A new arrangement of the species formely comprised in the genus Zebrina Held, 1837 is presented, and the genera Rhabdoena Kobelt & Moellendorff, 1902, and Leucomastus A. Wagner, 1927 are re-established. The following species and subspecies new to science could be described: Vitrea gostelii sp. n. (Pristilomatidae, Turanena demirsoyi sp. n., Euchondrus paucidentatus sp. n., Rhabdoena gostelii sp. n. (all Enidae, Metafruticicola kizildagensis sp. n. (Hygromiidae, and Assyriella thospitis menkhorsti ssp. n. (Helicidae. For several other species, new distribution records are listed.

  15. Efecto de la depuración en la biomasa del caracol Pomacea patula [Baker, 1922] usando el índice de condición

    Directory of Open Access Journals (Sweden)

    M. Garc\\u00EDa-Ulloa

    2006-01-01

    Full Text Available La depuración de organismos acuáticos en cultivo es una práctica común. El tiempo de exposición de los animales al agua tratada es uno de los factores más importantes para su eficiencia, pudiendo afectar su biomasa. Se evaluó el efecto de la depuración en adultos de Pomacea patula mediante la aplicación del índice de condición (IC, bajo condiciones de laboratorio. Caracoles adultos obtenidos en cultivo se mantuvieron en peceras (Grupo 1 expuestos a un flujo de agua constante, tratada con radiación ultravioleta y limpieza diaria y en condiciones normales de mantenimiento (Grupo 2, con 5 réplicas por grupo. Se obtuvo el peso húmedo y longitud total individualmente, al inicio y después de una depuración de 10 días. El valor promedio del coeficiente de correlación (animales iniciales y de los Grupos 1 y 2 fue mayor a 0.90. El IC entre el valor inicial (771.81 ± 40.41 y los Grupos 1 y 2 (763.527 ± 25.24 y 765.465 ± 38.59, respectivamente, no mostró diferencias significativas (P > 0.05 al final del experimento. Los resultados sugieren que el proceso de depuración usado no afectó la biomasa de adultos de P. patula. El IC se mostró como una herramienta práctica de evaluación sin considerar la diferencia inicial de tallas de caracoles adultos

  16. Temperature and light intensity affecting egg production and growth performance of the Apple Snail Pomacea patula [Baker, 1922

    Directory of Open Access Journals (Sweden)

    A. O. Meyer-Willerer

    2006-01-01

    Full Text Available Se efectuaron experimentos de desove del caracol dulceacuícola [Pomacea patula Baker, 1922] en tanques exteriores durante un año. Las observaciones incluyeron el desove de 30 hembras, total de huevos depositados y la eclosión de pequeños caracoles, todos por triplicado. Otros experimentos en el laboratorio con 30 hembras ovopositoras y sus respectivas masas de huevos bajo condiciones controladas (temperatura e intensidad luminosa fueron registrados por triplicado. Se comparan datos a diferentes temperaturas de agua y aire, entre 20 y 32°C, y a dos intensidades luminosas (60 y 300 lux en los sitios de desove. Una tercer serie de experimentos fueron llevados a cabo para determinar la tasa de crecimiento con 100 caracoles recién eclosionados por experimento con temperatura controlada (22 a 32°C y condiciones naturales de intensidad luminosa. Los resultados muestran, que el caracol tegogolo desovó principalmente de agosto a noviembre, cuando la temperatura del agua fue de 26°C o superior. La eficiencia de eclosión del huevo fue favorecida con temperatura media del aire. La ovoposición fue también afectada por la intensidad luminosa, ya que las hembras desovaron en lugares más intensamente iluminadas, cuando la temperatura del aire fue más baja; a 26°C o mayor, la preferencia se invirtió. Bajo condiciones de clima tropical, el tiempo de incubación de la larva tendió a ser menor y el desarrollo de los caracoles pequeños hasta adultos sexualmente maduros fue mayor; sin embargo, la supervivencia de la población utilizada para dicho estudio decreció

  17. Výsledky pr?zkumu m?kkýš? (Mollusca: Gastropoda, Bivalvia) v okolí m?sta Blatná v jihozápadních ?echách.

    Czech Academy of Sciences Publication Activity Database

    Bogusch, P.; Dvo?ák, L.; Hlavá?, Jaroslav

    2008-01-01

    Ro?. 7, - (2008), s. 33-46. ISSN 1336-6939 Institutional research plan: CEZ:AV0Z30130516 Keywords : Mollusca * Gastropoda * Bivalvia * faunistics * Blatná, Bohemia Subject RIV: EG - Zoology http://mollusca.sav.sk/pdf/7/7.Bogusch.pdf

  18. Trophic relationships between macroinvertebrates and fish in a pampean lowland stream (Argentina) / Relaciones tróficas entre los macroinvertebrados y peces en un arroyo de la llanura pampeana (Argentina)

    Scientific Electronic Library Online (English)

    María V., López van Oosterom; Carolina S., Ocón; Florencia, Brancolini; Miriam E., Maroñas; Eduardo D., Sendra; Alberto, Rodrigues Capítulo.

    2013-03-01

    Full Text Available Se evaluó la dieta y las relaciones tróficas entre los macroinvertebrados Phyllogomphoides joaquini Rodrigues Capítulo, 1992 y Coenagrionidae (Odonata), Chironomidae (Diptera), Diplodon delodontus (Lamarck, 1919) (Bivalvia: Hyriidae), Pomacea canaliculata (Lamarck, 1822) (Gastropoda: Ampulariidae) y [...] los peces Pimelodella laticeps Eigenmann, 1917 (Heptapteridae) y Bryconamericus iheringii (Boulenger, 1887) (Characidae) en un ecosistema lótico pampásico, sobre la base del contenido estomacal y el análisis de isótopos estables. La estrategia alimentaria fue analizada mediante el método de AMUNDSEN. La contribución relativa de cada categoría alimenticia para los taxa estudiados indicó que la estrategia predominante fue de tipo generalista. En general, en los macroinvertebrados, los valores de los isótopos estables confirmaron los resultados obtenidos por el análisis del contenido estomacal. En los peces, los isótopos estables demostraron que ambas especies son depredadores, aunque B. iheringii tiene un comportamiento más omnívoro. Además, el estudio de la alimentación, nos permitió establecer las conexiones tróficas entre los taxa estudiados. La principal fuente de alimento para los macroinvertebrados estudiados fueron el detritus y las diatomeas. En el arroyo La Choza la materia orgánica particulada es una fuente de recursos ilimitada con influencia significativa en toda la comunidad. Abstract in english The diet and trophic relationships between the macroinvertebrates Phyllogomphoides joaquini Rodrigues Capítulo, 1992 and Coenagrionidae (Odonata), Chironomidae (Diptera), Diplodon delodontus (Lamarck, 1919) (Bivalvia: Hyriidae), and Pomacea canaliculata (Lamarck, 1822) (Gastropoda: Ampulariidae) and [...] the fishes Pimelodella laticeps Eigenmann, 1917 (Heptapteridae) and Bryconamericus iheringii (Boulenger, 1887) (Characidae) in a temperate lowland lotic system in Argentina were assessed on the basis of gut contents and stable-isotope analyses. The feeding strategies were analyzed by the AMUNDSEN method. Relative food items contribution for the taxa studied indicated a generalist-type trophic strategy. In macroinvertebrates, in general, the values of stable isotope confirmed the result of the analysis of gut contents. With the fish, stable-isotope analysis demonstrated that both species are predators, although B. iheringii exhibited a more omnivorous behaviour. These feeding studies allowed us to determine the trophic relationships among taxa studied. Detritus and diatoms were a principal source of food for all the macroinvertebrates studied. In La Choza stream the particulate organic matter is a major no limited food resource, has a significant influence upon the community.

  19. Trophic relationships between macroinvertebrates and fish in a pampean lowland stream (Argentina Relaciones tróficas entre los macroinvertebrados y peces en un arroyo de la llanura pampeana (Argentina

    Directory of Open Access Journals (Sweden)

    María V. López van Oosterom

    2013-03-01

    Full Text Available The diet and trophic relationships between the macroinvertebrates Phyllogomphoides joaquini Rodrigues Capítulo, 1992 and Coenagrionidae (Odonata, Chironomidae (Diptera, Diplodon delodontus (Lamarck, 1919 (Bivalvia: Hyriidae, and Pomacea canaliculata (Lamarck, 1822 (Gastropoda: Ampulariidae and the fishes Pimelodella laticeps Eigenmann, 1917 (Heptapteridae and Bryconamericus iheringii (Boulenger, 1887 (Characidae in a temperate lowland lotic system in Argentina were assessed on the basis of gut contents and stable-isotope analyses. The feeding strategies were analyzed by the AMUNDSEN method. Relative food items contribution for the taxa studied indicated a generalist-type trophic strategy. In macroinvertebrates, in general, the values of stable isotope confirmed the result of the analysis of gut contents. With the fish, stable-isotope analysis demonstrated that both species are predators, although B. iheringii exhibited a more omnivorous behaviour. These feeding studies allowed us to determine the trophic relationships among taxa studied. Detritus and diatoms were a principal source of food for all the macroinvertebrates studied. In La Choza stream the particulate organic matter is a major no limited food resource, has a significant influence upon the community.Se evaluó la dieta y las relaciones tróficas entre los macroinvertebrados Phyllogomphoides joaquini Rodrigues Capítulo, 1992 y Coenagrionidae (Odonata, Chironomidae (Diptera, Diplodon delodontus (Lamarck, 1919 (Bivalvia: Hyriidae, Pomacea canaliculata (Lamarck, 1822 (Gastropoda: Ampulariidae y los peces Pimelodella laticeps Eigenmann, 1917 (Heptapteridae y Bryconamericus iheringii (Boulenger, 1887 (Characidae en un ecosistema lótico pampásico, sobre la base del contenido estomacal y el análisis de isótopos estables. La estrategia alimentaria fue analizada mediante el método de AMUNDSEN. La contribución relativa de cada categoría alimenticia para los taxa estudiados indicó que la estrategia predominante fue de tipo generalista. En general, en los macroinvertebrados, los valores de los isótopos estables confirmaron los resultados obtenidos por el análisis del contenido estomacal. En los peces, los isótopos estables demostraron que ambas especies son depredadores, aunque B. iheringii tiene un comportamiento más omnívoro. Además, el estudio de la alimentación, nos permitió establecer las conexiones tróficas entre los taxa estudiados. La principal fuente de alimento para los macroinvertebrados estudiados fueron el detritus y las diatomeas. En el arroyo La Choza la materia orgánica particulada es una fuente de recursos ilimitada con influencia significativa en toda la comunidad.

  20. Izolované populace praménky Bythinella austriaca (Frauenfeld, 1857 (Gastropoda: Hydrobiidae v okolí Prahy Isolated populations of Bythinella austriaca (Frauenfeld, 1857 (Gastropoda: Hydrobiidae in Prague surroundings (Czech Republic

    Directory of Open Access Journals (Sweden)

    Luboš Beran

    2010-03-01

    Full Text Available This paper completes the knowledge of an occurrence of Bythinella austriaca (Frauenfeld, 1857 (Gastropoda: Hydrobiidae in surroundings of Prague – capital of the Czech Republic. However, this species is not rare in the eastern part of the Czech Republic, sites on north-western otskirts of Prague are isolated far from the main distribution area. Altogether, 63 sites potentially suitable for B. austriaca were investigated in this area, and occurrence of this species was confirmed in 11 of them. B. austriaca was found in springs, rivulets and small brooks, more numerous populations were found in springs. Historical occurrence data in this area were compared with results of research done in 2003, 2006 and 2010. Actual situation of this species in Prague surroundings is problematic and survival of some populations is not guaranteed.

  1. LARVAS DE DIGENEA EN Melanoides tuberculata (GASTROPODA: THIARIDAE EN MEDELLÍN, COLOMBIA Larval stages of digenea from Melanoides tuberculata (Gastropoda: Thiaridae in Medellín, Colombia

    Directory of Open Access Journals (Sweden)

    DANIELA VERGARA

    Full Text Available Se describen las larvas de digeneos que se obtuvieron en Melanoides tuberculata (Gastropoda: Thiaridae, molusco dulceacuícola del que se colectaron 125 especímenes en el lago del Jardín Botánico Joaquín Antonio Uribe de Medellín. En el laboratorio se individualizaron y se estimuló la emisión cercariana con una fuente luminosa. El 9,6 % de los caracoles emitió cercarias. Los moluscos emisores se sacrificaron para obtener los demás estadios larvarios. Las larvas se montaron al microscopio, se midieron y luego se dibujaron. Los caracteres morfológicos permitieron establecer la presencia de Centrocestus formosanus (Heterophyidae y de dos Philophthalmidae. Uno de estos es primer registro para Colombia. Se confirma la sensibilidad de M. tuberculata a infecciones por digeneos, así como la especificidad de los filoftálmidos por moluscos hospedadores de la superfamilia Cerithioidea.The larvae of two trematodes found in the freshwater mollusk Melanoides tuberculata (Gastropoda: Thiaridae are described. 125 snails from the Medellin’s Botanical Garden Joaquín Antonio Uribe were collected. In the laboratory, each individual was placed alone and stimulated with light in order to have cercaria emission. 9.6% of the snails released cercariae. These were separated in three morphologies. From each one, 15 individuals were measured and drawn. Photographs were taken. Based on their morphological characteritics the presence of Centrocestus formosanus (Heterophyidae was determined. The other two morphologies were classified in the family Philophthalmidae. One of them constitutes the first register for Colombia. The sensibility of M. tuberculata to infections by digeneans, and the specificity of the family Philophthalmidae to mollusk hosts of the superfamily Cerithioidea are confirmed

  2. LARVAS DE DIGENEA EN Melanoides tuberculata (GASTROPODA: THIARIDAE) EN MEDELLÍN, COLOMBIA / Larval stages of digenea from Melanoides tuberculata (Gastropoda: Thiaridae) in Medellín, Colombia

    Scientific Electronic Library Online (English)

    DANIELA, VERGARA; LUZ ELENA, VELÁSQUEZ.

    2009-04-30

    Full Text Available Se describen las larvas de digeneos que se obtuvieron en Melanoides tuberculata (Gastropoda: Thiaridae), molusco dulceacuícola del que se colectaron 125 especímenes en el lago del Jardín Botánico Joaquín Antonio Uribe de Medellín. En el laboratorio se individualizaron y se estimuló la emisión cercar [...] iana con una fuente luminosa. El 9,6 % de los caracoles emitió cercarias. Los moluscos emisores se sacrificaron para obtener los demás estadios larvarios. Las larvas se montaron al microscopio, se midieron y luego se dibujaron. Los caracteres morfológicos permitieron establecer la presencia de Centrocestus formosanus (Heterophyidae) y de dos Philophthalmidae. Uno de estos es primer registro para Colombia. Se confirma la sensibilidad de M. tuberculata a infecciones por digeneos, así como la especificidad de los filoftálmidos por moluscos hospedadores de la superfamilia Cerithioidea. Abstract in english The larvae of two trematodes found in the freshwater mollusk Melanoides tuberculata (Gastropoda: Thiaridae) are described. 125 snails from the Medellin’s Botanical Garden Joaquín Antonio Uribe were collected. In the laboratory, each individual was placed alone and stimulated with light in order to h [...] ave cercaria emission. 9.6% of the snails released cercariae. These were separated in three morphologies. From each one, 15 individuals were measured and drawn. Photographs were taken. Based on their morphological characteritics the presence of Centrocestus formosanus (Heterophyidae) was determined. The other two morphologies were classified in the family Philophthalmidae. One of them constitutes the first register for Colombia. The sensibility of M. tuberculata to infections by digeneans, and the specificity of the family Philophthalmidae to mollusk hosts of the superfamily Cerithioidea are confirmed

  3. Statement on the identity of apple snails : Scientific Opinion, EFSA Panel on Plant Health (PLH)

    DEFF Research Database (Denmark)

    Baker, R.; Candresse, T.

    2012-01-01

    Following a request by the European Commission, EFSA’s Panel on Plant Health was asked to deliver a statement to clarify the current scientific knowledge regarding the identity of the apple snails in the context of the evaluation of the pest risk analysis prepared by the Spanish Ministry of Environment and Rural and Marine Affairs (EFSA Panel on Plant Health (PLH), 2012). The Panel concludes on the risk to plant health posed by Pomacea species in the ‘canaliculata complex’, that out of the around 50 species in the genus of Pomacea, four species P. canaliculata, P. insularum, P. lineata and P. maculata belong to the ‘canaliculata complex’, where P. insularum and P. maculata are recently considered to be synonyms. Current methods of identification imply high uncertainty if risk reduction options are applied at the Pomacea single species level. The Spanish pest risk analysis identifies important plant health risks connected to Pomacea species. The available scientific evidence indicates that other Pomacea species may pose similar risks to plant health as identified for P. insularum. The Panel clarifies that risk reduction options should not be targeted to single species of the genus Pomacea considering: (i) the dynamical situation in the current study on the systematics of the Ampullariidae species and the genus Pomacea in particular; (ii) the uncertainties and the possible unexpected evolution of the invasive potential of species of Pomacea other than P. insularum and P. canaliculata; (iii) the poor knowledge on the trophic habits of many species of the genus Pomacea, with possible overlaps in the trophic niche (macrophytes); (iv) the high uncertainty on the identification of the different Pomacea species.

  4. Larval trematodes (Digenea) of planorbid snails (Gastropoda: Pulmonata) in Central Europe: a survey of species and key to their identification.

    Czech Academy of Sciences Publication Activity Database

    Faltýnková, Anna; Našincová, Vanda; Kablásková, Lenka

    2008-01-01

    Ro?. 69, ?. 3 (2008), s. 155-178. ISSN 0165-5752 R&D Projects: GA AV ?R IAA6022404; GA ?R GD524/03/H133; GA ?R GP524/07/P086; GA MŠk LC522 Institutional research plan: CEZ:AV0Z60220518 Keywords : Planorbidae * Digenea * cercariae * Gastropoda * Pulmonata * Central Europe Subject RIV: EG - Zoology Impact factor: 0.927, year: 2008

  5. Divergencia intraespecífica y código de barras de ADN en Systrophia helicycloides (Gastropoda, Scolodontidae) / Intraspecific divergence and DNA barcodes in Systrophia helicycloides (Gastropoda, Scolodontidae)

    Scientific Electronic Library Online (English)

    Pedro, Romero; Rina, Ramírez.

    2011-08-01

    Full Text Available El DNA barcoding es un análisis que se basa en la comparación de distancias genéticas para identificar especies utilizando principalmente un segmento del gen Citocromo C Oxidasa I (COI). Los retos para la identificación surgen al estudiar grupos que presentan gran diversidad genética como los molusc [...] os. Por ello, los objetivos de nuestra investigación fueron estimar la divergencia intraespecífica en el molusco terrestre amazónico Systrophia helicycloides (Gastropoda, Scolodontidae) y evaluar la utilización de los códigos de barras de ADN en la identificación molecular de esta especie. Las secuencias de nucleótidos fueron comparadas con las bases de datos Genbank y BOLD (Barcode of Life Data Systems). Se realizó un análisis de distancia genética mediante Neighbour Joining. Systrophia helicycloides presentó dos grupos de haplotipos con distancias genéticas intraespecíficas mayores a 4%. También se observó una superposición entre las distancias intraespecíficas y las interespecíficas. La gran divergencia intraespecífica puede estar relacionada a la rápida variación del genoma mitocondrial, la distribución poblacional de los moluscos la cual permite el aislamiento y diferenciación genética, y la presencia de polimorfismos ancestrales. Los perfiles COI enviados a la base de datos BOLD son los primeros registros para esta especie y permitieron diferenciar a Systrophia helicycloides de otras especies. Estos perfiles corroboran la gran variación que ocurre en el genoma mitocondrial de moluscos terrestres por lo que la asignación de especies en este grupo precisa de la combinación entre los valores de divergencia genética, la evaluación de sitios informativos y los estudios de taxonomía convencional. Abstract in english DNA barcoding analysis is based on the comparison of genetic distances to identify species using a segment of Cytochrome C Oxidase I (COI) gene. Species identification through DNA barcoding challenges problems in groups with high genetic diversity as molluscs. Thus, our aim was to estimate intraspec [...] ific divergence in the Amazonian land snail Systrophia helicycloides (Gastropoda, Scolodontidae) and evaluate the use of DNA barcoding in molecular identification of this land snail. Nucleotide sequences were compared with Genbank and BOLD (Barcode of Life Data Systems) databases. We conducted distance analyses using the Neighbour Joining method. Systrophia helicycloides showed two groups of haplotypes and intraspecific genetic distances higher than 4%. We observed an overlap between intraspecific and interspecific distances. The high divergence may be related to rapid mutation rate in the snail mitochondrial genome, to population distribution that influences genetic isolation and differentiation, and to ancestral DNA polymorphisms. COI profiles uploaded in BOLD are the first records of this species and can identify Systrophia helcycloides from other species. These profiles corroborated the high variation in the land snail genome. Therefore, species identification in this group needs a combined analysis of genetic distances, informative sites, and conventional taxonomy.

  6. Biogeographic and species richness patterns of Gastropoda on the southwestern Atlantic

    Directory of Open Access Journals (Sweden)

    FLOETER S. R.

    1999-01-01

    Full Text Available Patterns of richness and biogeography of Gastropoda molluscs were determined based on lists of species from five sites along the southwestern Atlantic. The analysis of the distribution patterns of these sites confirmed the existence of a broader transition zone between southern Espírito Santo State (21°S and Rio Grande do Sul State (32°S. This zone is very heterogeneous, presenting a low endemism rate and a significant number of species common to the near provinces, and does not show enough consistency to be considered as an independent biogeographic province as proposed by Palacio (1980. Observing the distribution of species along the southwestern Atlantic we find an increase in the proportion of species with greatest latitudinal ranges (occurring from the tropics to Patagonia from lowest to highest latitudes, following Rappoport's rule.

  7. Effects of diet on the carotenoid pigment and lipid content of Pomacea bridgesii as determined by quantitative high performance thin layer chromatography.

    Science.gov (United States)

    Jarusiewicz, Jamie A; Fried, Bernard; Sherma, Joseph

    2006-02-01

    High performance thin layer chromatography was used to quantify the concentrations of beta-carotene and lutein in the whole bodies and digestive gland-gonad complexes of Pomacea bridgesii fed on a lettuce diet and a hen's egg yolk diet, and snails starved for one week. beta-carotene and lutein concentrations were determined in the fecal matter of cultures on the lettuce and yolk diets as well. Significantly higher amounts of beta-carotene were found in the whole bodies of snails fed lettuce compared with those starved for a week. beta-carotene was not detected in the whole bodies and digestive gland-gonad complexes of snails fed hen's egg yolk. Neutral and polar lipid levels were also quantified in P. bridgesii fed lettuce and yolk. Significantly higher amounts of triacylglycerols were detected in the digestive gland-gonad complexes of snails maintained on the egg yolk diet. PMID:16377225

  8. LARVAS DE DIGENEA EN Melanoides tuberculata (GASTROPODA: THIARIDAE EN MEDELLÍN, COLOMBIA

    Directory of Open Access Journals (Sweden)

    VELÁSQUEZ LUZ ELENA

    2009-04-01

    Full Text Available

    RESUMEN

    Se describen las larvas de digeneos que se obtuvieron en Melanoides tuberculata (Gastropoda: Thiaridae, molusco dulceacuícola del que se colectaron 125 especímenes en el lago del Jardín Botánico Joaquín Antonio Uribe de Medellín. En el laboratorio se individualizaron y se estimuló la emisión cercariana con una fuente luminosa. El 9,6 % de los caracoles emitió cercarias. Los moluscos emisores se sacrificaron para obtener los demás estadios larvarios. Las larvas se montaron al microscopio, se midieron y luego se dibujaron. Los caracteres morfológicos permitieron establecer la presencia de Centrocestus formosanus (Heterophyidae y de dos Philophthalmidae. Uno de estos es primer registro para Colombia. Se confirma la sensibilidad de M. tuberculata a infecciones por digeneos, así como la especificidad de los filoftálmidos por moluscos hospedadores de la superfamilia Cerithioidea.

    Palabras claves: cercarias, digenea, Melanoides tuberculata, Philophthalmidae, Redias.


    ABSTRACT

    The larvae of two trematodes found in the freshwater mollusk Melanoides tuberculata (Gastropoda: Thiaridae are described. 125 snails from the Medellin’s Botanical Garden Joaquín Antonio Uribe were collected. In the laboratory, each individual was placed alone and stimulated with light in order to have cercaria emission. 9.6% of the snails released cercariae. These were separated in three morphologies. From each one, 15 individuals were measured and drawn. Photographs were taken. Based on their morphological characteritics the presence of Centrocestus formosanus (Heterophyidae was determined. The other two morphologies were classified in the family Philophthalmidae. One of them constitutes the first register for Colombia. The sensibility of M. tuberculata to infections by digeneans, and the specificity of the family Philophthalmidae to mollusk hosts of the superfamily Cerithioidea are confirmed.

    Key words: Cercariae, Digenea, Melanoides tuberculata, Philophthalmidae, Rediae.


  9. Effects of thermal effluents on the population dynamics of Physa gyrina Say (Mollusca: Gastropoda) at Lake Wabamun, Alberta

    International Nuclear Information System (INIS)

    Effects of thermal effluents on the population dynamics of Physa gyrina Say (Gastropoda: Pulmonata) were studied at Lake Wabamun, Alberta, from May 1971 to August 1973. Thermal effluent increased the rate of development of eggs and the growth of P. gyrina, and allowed continuous reproductive activity throughout the year. These changes, and the increased period of growth of aquatic macrophytes, resulted in increased population densities of P. gyrina in the heated area during summer. Temperatures below 10 deg C or small amounts of vegetation appear to limit the population of P. gyrina in winter. (author)

  10. Nanoindentations on conch shells of Gastropoda and Bivalvia molluscs reveal anisotropic evolution against external attacks.

    Science.gov (United States)

    Bignardi, Cristina; Petraroli, Michele; Pugno, Nicola M

    2010-10-01

    Nanoindentation method has been used to explore, at the nanoscale, the mechanical properties of four different representative types of conch shells belonging to the two biggest classes of molluscs, Gastropoda and Bivalvia, in order to compare nanohardness and Young's modulus with respect to the microstructural anisotropic architectures. For the experimental tests a Nano Indenter XP (MTS Nano Instruments, Oak Ridge TN) has been used. The mechanical tests have been carried out on the inner and outer surfaces of the shells, as well as on their cross-section, near to the inner/outer surfaces and in the middle layer. The results confirm the three layered anisotropic architecture of the investigated conchs. On each of these 5 surfaces, 2 x 5 indentations have been performed at different maximum depth: from 250 nm to 4 microm, with a step of 250 nm, for a total of 3200 tests. The numerous observations have been analysed applying an ad hoc modification of the Weibull Statistics, suggesting a natural evolution of the shells against external attacks. PMID:21137746

  11. Divergencia intraespecífica y código de barras de ADN en Systrophia helicycloides (Gastropoda, Scolodontidae

    Directory of Open Access Journals (Sweden)

    Pedro Romero

    2011-08-01

    Full Text Available El DNA barcoding es un análisis que se basa en la comparación de distancias genéticas para identificar especies utilizando principalmente un segmento del gen Citocromo C Oxidasa I (COI. Los retos para la identificación surgen al estudiar grupos que presentan gran diversidad genética como los moluscos. Por ello, los objetivos de nuestra investigación fueron estimar la divergencia intraespecífica en el molusco terrestre amazónico Systrophia helicycloides (Gastropoda, Scolodontidae y evaluar la utilización de los códigos de barras de ADN en la identificación molecular de esta especie. Las secuencias de nucleótidos fueron comparadas con las bases de datos Genbank y BOLD (Barcode of Life Data Systems. Se realizó un análisis de distancia genética mediante Neighbour Joining. Systrophia helicycloides presentó dos grupos de haplotipos con distancias genéticas intraespecíficas mayores a 4%. También se observó una superposición entre las distancias intraespecíficas y las interespecíficas. La gran divergencia intraespecífica puede estar relacionada a la rápida variación del genoma mitocondrial, la distribución poblacional de los moluscos la cual permite el aislamiento y diferenciación genética, y la presencia de polimorfismos ancestrales. Los perfiles COI enviados a la base de datos BOLD son los primeros registros para esta especie y permitieron diferenciar a Systrophia helicycloides de otras especies. Estos perfiles corroboran la gran variación que ocurre en el genoma mitocondrial de moluscos terrestres por lo que la asignación de especies en este grupo precisa de la combinación entre los valores de divergencia genética, la evaluación de sitios informativos y los estudios de taxonomía convencional.

  12. Cargols terrestres (Gastropoda, Stylommatophora del Parc Natural de la Muntanya de Montserrat (Barcelona, NE península ibèrica

    Directory of Open Access Journals (Sweden)

    Bros, V.

    2006-11-01

    Full Text Available Land snails (Gastropoda, Stylommatophora in the Natural Park of Montserrat (Barcelona, NE Iberian peninsula The inventory of 73 land snails in the Natural Park of Montserrat was updated following the review of 130 publications. Planned field study was also conducted in areas of different habitats on the Montserrat mountain to provide a preliminary description of the communities of land snails in the study area. A total of 342 samples of land snails were studied and 50 species were identified. The most frequent were Pomatias elegans, Helicigona lapicida, Pseudotachea splendida, Abida polyodon and Otala punctata. In this region of the prelittoral Catalan mountain range, the level of endemism was high for Abida secale bofilli, Montserratina bofilliana and Xerocrassa montserratensis.The results of the field work extend the faunistic catalogue of the Natural Park of Montserrat to include references to Hygromia cinctella, Microxeromagna lowei, Paralaoma servilis and Punctum pygmaeum in the area. Finally, investigation and conservation programmes are suggested for the endemic species Xerocrassa montserratensis, protected by the Plan for Areas of Natural Interest (PEIN approved by Decree 328/1992.

  13. Influence of water quality on zinc toxicity to the Florida apple snail (Pomacea paludosa) and sensitivity of freshwater snails to zinc.

    Science.gov (United States)

    Hoang, Tham C; Tong, Xin

    2015-03-01

    The present study characterized the influence of water-quality characteristics on zinc (Zn) toxicity to the Florida apple snail (Pomacea paludosa) and the sensitivity of freshwater snails to Zn. Standard 96-h renewal acute toxicity tests were conducted with Zn and juvenile P. paludosa under 3 conditions of pH and alkalinity, water hardness, and dissolved organic carbon (DOC). Median lethal effect concentrations (96-h LC50s), no-observed- effect concentrations, lowest-observed-effect concentrations, LC10s, and LC20s were determined for each test. The results showed that Zn toxicity to P. paludosa decreased linearly with increasing hardness, pH, and DOC. A multiple linear regression model based on pH, hardness, and DOC was able to explain 99% of the observed variability in LC50s. These results are useful for the development of a biotic ligand model (BLM) for P. paludosa and Zn. Zinc acute toxicity data were collected from the literature for 12 freshwater snail species in a wide range of water-quality characteristics for species sensitivity distribution analysis. The results showed that P. paludosa is the second most sensitive to Zn. The present study also suggested that aqueous ZnCO3 and ZnHCO3 (-) can be bioavailable to P. paludosa. Therefore, bioavailability models (e.g., BLM) should take these Zn species into consideration for bioavailability when applied to snails. PMID:25475172

  14. A new land snail from the Quaternary of Mallorca (Balearic Islands, Western Mediterranean): Darderia bellverica n. gen., n. sp. (Gastropoda Pulmonata, Helicodontidae)

    OpenAIRE

    Altaba, C.R.

    2006-01-01

    A new land snail from the Quaternary of Mallorca (Balearic Islands, Western Mediterranean): Darderia bellverica n. gen., n. sp. (Gastropoda Pulmonata, Helicodontidae A new genus and species of land snail is described from pre-human paleosoils at Bellver hill in the island of Mallorca. It is a medium-sized helicodontid with 6 tight coils, dome-shaped spire, obtuse peripheral keel, eccentric umbilicus, narrow aperture inclined forward, sinuous reflected peristome, a low angular tooth, 5 infrapa...

  15. Climate and pH predict the potential range of the invasive apple snail (Pomacea insularum) in the southeastern United States.

    Science.gov (United States)

    Byers, James E; McDowell, William G; Dodd, Shelley R; Haynie, Rebecca S; Pintor, Lauren M; Wilde, Susan B

    2013-01-01

    Predicting the potential range of invasive species is essential for risk assessment, monitoring, and management, and it can also inform us about a species' overall potential invasiveness. However, modeling the distribution of invasive species that have not reached their equilibrium distribution can be problematic for many predictive approaches. We apply the modeling approach of maximum entropy (MaxEnt) that is effective with incomplete, presence-only datasets to predict the distribution of the invasive island apple snail, Pomacea insularum. This freshwater snail is native to South America and has been spreading in the USA over the last decade from its initial introductions in Texas and Florida. It has now been documented throughout eight southeastern states. The snail's extensive consumption of aquatic vegetation and ability to accumulate and transmit algal toxins through the food web heighten concerns about its spread. Our model shows that under current climate conditions the snail should remain mostly confined to the coastal plain of the southeastern USA where it is limited by minimum temperature in the coldest month and precipitation in the warmest quarter. Furthermore, low pH waters (pH swamps, especially Okefenokee Swamp in southern Georgia (with a pH below 4 in many areas), which are predicted to preclude the snail's establishment even though many of these areas are well matched climatically. Our results elucidate the factors that affect the regional distribution of P. insularum, while simultaneously presenting a spatial basis for the prediction of its future spread. Furthermore, the model for this species exemplifies that combining climatic and habitat variables is a powerful way to model distributions of invasive species. PMID:23451090

  16. Diversidad genética de dos poblaciones del caracol Strombus gigas (Gastropoda: Strombidae en Yucatán, México, con microsatélite

    Directory of Open Access Journals (Sweden)

    Roberto Zamora-Bustillos

    2011-09-01

    Full Text Available El caracol rosado S. gigas, es una especie de gran importancia pesquera en la región del Caribe que incluye la Península de Yucatán, en la cual, se analizó la diversidad y estructura genética de dos poblaciones (Arrecife Alacranes y Banco Chinchorro mediante el uso de cinco marcadores moleculares del tipo microsatélites. Los resultados indican que las dos poblaciones analizadas se encuentran en el mismo rango de diversidad genética (He de 0.613 a 0.692. En ambas poblaciones también se observó una desviación significativa al equilibrio H-WE, la cual fue atribuida a factores como la endogamia a consecuencia de una sobre-explotación pesquera. Sin embargo otra explicación posible es que se deba a una mezcla de individuos de dos o más poblaciones, y la existencia de alelos nulos. Los niveles de estructura genética indican la existencia de una sola población homogénea en la península de Yucatán (F ST de 0.003, p=0.49 y el flujo genético fue significativo (2.3 individuos entre las dos poblaciones. Los resultados de este estudio aceptan la hipótesis de que las poblaciones S. gigas forman parte de una sola población panmíctica en la Península de Yucatán, por lo tanto, el recurso pesquero debe regularse de igual manera en ambas regiones.Genetic diversity in two populations of the snail Strombus gigas (Gastropoda: Strombidae from Yucatan, Mexico, using microsatellite. The pink conch Strombus gigas is an important fisheries resource in the Caribbean region, including the Yucatán Peninsula. We analyzed the genetic diversity and genetic structure of two populations (Alacranes Reef and Chinchorro Bank with the use of five microsatellite molecular markers. The results indicate that the two populations are in the same rank of genetic diversity (He, from 0.613 to 0.692. Significant deviation from H-WE was observed in the both populations due to deficit to heterozygotes, this was attributed to inbreeding as a consequence of over- fishing; nevertheless, other possible causes considered are mixing of individuals from two or more populations, and the existence of null alleles. Levels of genetic differentiation indicated the existence of a single homogenous population in the Yucatan Peninsula (F ST de 0.003, p=0.49, which fits with highest levels of gene flow is significant (2.3 individuals between both populations. Results from this study support the hypothesis that S. gigas is part of a single panmictic population in the Yucatan Peninsula; therefore, this fishery resource should be regulated the same way for both areas. Rev. Biol. Trop. 59 (3: 1127-1134. Epub 2011 September 01.

  17. Los moluscos terrestres (Mollusca: Gastropoda) de Costa Rica: clasificación, distribución y conservación

    Scientific Electronic Library Online (English)

    Zaidett, Barrientos Llosa.

    1165-11-01

    Full Text Available Los moluscos terrestres son un grupo muy poco estudiado a nivel mundial. Hay 183 especies reportadas para Costa Rica, 30% son endémicas y 7% posiblemente están extintas. Se espera que en el país haya alrededor de 400 especies, de más del 95% se desconoce su biología, ecología, distribución, genética [...] y otros campos de estudio. En Costa Rica las familias con mayor número de especies son Spiraxidae, Orthalicidae y Subulinidae. No obstante, es posible que Euconulidae sea aun más diversa, pues habitan las zonas altas del país que es en donde menos trabajo se ha hecho. El estudio de regiones altas aumentará el porcentaje de endemismo. Los futuros trabajos malacológicos taxonómicos, biológicos y ecológicos deben considerar la poca movilidad de este grupo, su tendencia a formar especies nuevas en simpatría, la especificidad de requerimientos de microhábitat, el hermafroditismo, la alta tasa de evolución (10% por millón de años) y la divergencia entre especies (2-30%). Para proteger adecuadamente la biodiversidad de la malacofauna costarricense, se requiere de estudios que determinen la distribución y abundancia de las especies y el efecto del uso de la tierra y del climático. Abstract in english Terrestrial mollusks (Mollusca: Gastropoda) of Costa Rica: classification, distribution and conservation. Terrestrial mollusks are poorly known worldwide. The country has 183 reported species, 30% endemic and 7% are probably extinct. About 400 species are expected to inhabit the country. Biology, ec [...] ology, distribution, genetics and other areas of research are unknown for more than 95% of the species. The most diverse families are Spiraxidae, Orthalicidae and Subulinidae. However, the family that may have more species is Euconulidae. Euconulids inhabit the highlands, where less work has been done. The study of species of highlands will also rise the endemism rate. Future taxonomic, biological and ecological work should consider their low vagility, tendency to produce new taxa in sympatry, specific microhabitat requirements, hermaphroditism, high evolutionary rate (10% per million years), and divergence between species (2 to 30%). Urgent studies to protect the Costa Rican malacofauna include: distribution, abundance, effect of land use and climate changes on populations. Rev. Biol. Trop. 58 (4): 1165-1175. Epub 2010 December 01.

  18. Cariotipos de los caracoles de tinte Plicopurpura pansa y Plicopurpura columellaris (Gastropoda: Muricidae)

    Scientific Electronic Library Online (English)

    Lenin, Arias-Rodriguez; Juan P, González-Hermoso; Horacio, Fletes-Regalado; Luz Estela, Rodríguez-Ibarra; Gabriela Del Valle, Pignataro.

    2007-12-01

    Full Text Available El cariotipo de Plicopurpura pansa y P. columellaris fue determinado a partir de 17 y 13 especímenes adultos respectivamente. Adicionalmente, se utilizaron ocho cápsulas de P. pansa. Contamos 186 campos mitóticos en P. pansa: 59 en los adultos y 127 en los embriones; y 118 campos en P. columellaris. [...] En ambas especies se observaron números cromosómicos desde 30 hasta 42. Las variaciones en número cromosómico fueron identificadas en cada individuo, no habiendo ninguna relación con los tejidos (branquias, músculo y estómago) empleados. El número modal diploide típico fue de 2n=36 cromosomas en ambas especies. En los especímenes adultos seleccionamos cinco de las mejores dispersiones cromosómicas para armar el cariotipo. Calculamos los estadísticos citogenéticos clásicos, longitudes relativas, proporción de brazos, índice centromérico y la diferencia entre brazos. Identificamos en ambas especies tres pares de cromosomas metacéntricos y quince pares de cromosomas telocéntricos. Esta clasificación no fue suficientemente robusta, por lo que dividimos el complemento cromosómico de cada especie en cuatro grupos ("a", "b", "c" y "d") utilizando como criterio las longitudes relativas (p+q). Hubo diferencias significativas entre grupos cromosómicos por especie y entre especies, los tres primeros pares de cromosomas (grupo "a" birrámeos) y los dos últimos pares (grupo "d" monorrámeos menores) (análisis de varianza de dos vías, p Abstract in english Karyotypes of the purple snails Plicopurpura pansa and Plicopurpura columellaris (Gastropoda: Muricidae). The karyotypes of the purple snails Plicopurpura pansa (Gould, 1853) and P. columellaris (Lamarck, 1816) were established from 17 and 13 adults, respectively; and from eight capsules with embryo [...] s of P. pansa. In P. pansa were counted 59 mitotic fields in the adults and 127 in embryos; and 118 fields in P. columellaris. Chromosome numbers from 30 to 42 were observed in both species. Such a variation was notorious in each sample and there was no evidence of any relationship with tissue (gill, muscle and stomach). Both species has a typical modal number of 2n=36 chromosomes. Five good quality chromosome spreads were selected from adults of each species to assemble the karyotype. Classic cytogenetics statistics like relative lengths, arm ratio, centromeric index and the difference between long and short arms are presented. There were three pairs of metacentric and fifteen pairs of telocentric chromosomes in both species. This classification was not strong enough, so the chromosome complement by species was divided in four groups ("a", "b", "c" and "d") on the basis of relative lengths (p+q). A comparison of p+q in each chromosome pair was estimated within and between species by two ways analysis of variance and Tukey tests (P

  19. Influence of processing on the quality of pomaceas juice (Pyrus communis and Malus domestica) / Influência do processamento na qualidade do suco de pomáceas (Pyrus communis e Malus domestica)

    Scientific Electronic Library Online (English)

    Andressa Schaia, Rocha; Acácio Antonio Ferreira, Zielinski; Suelen, Ávila; Alessandro, Nogueira; Gilvan, Wosiacki.

    2013-03-01

    Full Text Available A pera (Pyrus communis), terceira fruta cultivada em climas temperados e subtropicais e somente superada pela maçã e o pêssego, guardam semelhanças físicas e químicas enquanto pomaceas. Somente há processamento de pera na falta de maçã enquanto matéria prima, o que sugere que a mesma linha tecnológi [...] ca possa ser usada. São compatíveis, sendo permitida a adição de suco de pera no suco de maçã pela legislação. Os indicadores de qualidade mais acentuados no suco de pera foram acidez, o teor de compostos fenólicos totais e a capacidade antioxidante. Na distribuição de açúcares os teores de frutose foram expressivamente mais acentuados no suco de pera, com menores valores quando era empregado o método enzimático. A intensidade de cor, determinada instrumentalmente, foi mais expressiva no suco de pera, em especial no despolpamento, enquanto que no de maçã, no enzimático. Os resultados indicam de forma clara que a pera se comporta como matéria-prima aos processos com aptidão ao processamento de maçã, todavia cada fruta tem o seu próprio perfil de qualidade. Os resultados claramente apontam para os procedimentos mais adequados para obter bons produtos eis que as etapas de moagem e a de extração seguramente contribuem para a modificação da qualidade dos sucos de pera e de maçã. Abstract in english Pear (Pyrus communis), which is intensively cultivated in subtropical and temperate climates, has recently attained the 3rd position in the world fruit ranking, just after apple and peach. This fruit exhibits certain similarities to apple with respect to the pulp, but pear is used as a raw material [...] only when apple is no longer available, which suggests that the same technology line may be utilized. Both fruits do have processing compatibilities, and it is permissible to add pear juice to apple juice at levels defined by law. Quality indicators, such as pH, total acidity, total phenolic compounds and antioxidant activity were used. The simple sugar analysis clearly defines fructose as the main component in pear juice, and lower figures were found when enzymatic processing was used. Color intensity measured instrumentally was much greater in pear juice with all processing methods and in apple juice when an enzymatic method was used. The results clearly indicate proper ways of processing pear and apple, aiming to have better products, as the grinding and extraction processing steps surely affect the fruit juice quality.

  20. Los moluscos (Pelecypoda, Gastropoda, Cephalopoda, Polyplacophora y Scaphopoda) recolectados en el SE del golfo de California durante las campañas SIPCO a bordo del B/O "El Puma": Elenco faunístico / Mollusks (Pelecypoda, Gastropoda, Cephalopoda, Polyplacophora and Scaphopoda) collected in the SE Gulf of California during the SIPCO cruises aboard the R/V "El Puma": Faunistic catalog

    Scientific Electronic Library Online (English)

    Michel E., Hendrickx; José, Salgado-Barragán; Arturo, Toledano-Granados; Mercedes, Cordero-Ruiz.

    Full Text Available Un total de 202 especies (122 géneros entre 62 familias) y 4 979 ejemplares de moluscos se recolectó en 24 arrastres de fondo que se realizaron en la plataforma continental frente a las costas de Sinaloa, en el SE del golfo de California, México. Los arrastres se efectuaron entre 27 y 117 m de profu [...] ndidad, durante las Campañas SIPCO I, II y III, a bordo del buque oceanográfico "El Puma", de la Universidad Nacional Autónoma de México, en abril y agosto de 1981 y en enero de 1982. El material obtenido se reparte entre las diversas clases de moluscos como sigue: Pelecypoda, 55 especies; Gastropoda, 140; Cephalopoda, 3; Polyplacophora, 3; Scaphopoda, 1 especie. Algunas especies no pudieron ser identificadas (2 Bivalvia; 4 Gastropoda; 1 Cephalopoda), pero se reconocieron como distintas a las demás. El listado presentado incluye la lista del material examinado, así como la distribución geográfica de cada especie. Además, se incluye una ilustración de cada una de las especies recolectadas. Abstract in english A total of 202 species (122 genera in 62 families) and 4 979 specimens of mollusks was collected in 24 bottom trawls on the continental shelf off the coast of Sinaloa, in the SE Gulf of California, Mexico. The trawls were made between 27 and 117 m depth during the SIPCO I, II and III cruises aboard [...] the research vessel "El Puma" of the Universidad Nacional Autónoma de México in April and August 1981, and in January 1982. The material obtained belongs to five classes of mollusks: Pelecypoda, 55 species, Gastropoda, 140; Cephalopoda, 3; Polyplacophora, 3; Scaphopoda, 1 species. Some species (2 Bivalvia; 4 Gastropoda; 1 Cephalopoda) could not be identified but were recognized as distinct. The check list presented includes the material examined and the geographic distribution of all species. In addition, an illustration of each collected species is provided.

  1. A associação entre Crepidula aculeata (Gastropoda, Calyptraeidae) a alga calcárea Amphiroa beauvoisii, na Baía de Santos, São Paulo, Brasil

    Scientific Electronic Library Online (English)

    Setuko, Masunari.

    Full Text Available [...] Abstract in english Association Crepidula aculeata - Amphiroa beauvoisii. Population study of Crepidula aculeata Gmelin, 1791) (Gastropoda Calyptraeidae) and analysis of protocooperative association between the mollusc and the alga were carried out in the phytal of calcareous alga Amphiroa beauvoisii Lamouroux, 1816 at [...] Ilha das Palmas, Santos Bay (24º00'S - 46º19'W). Samples were collected at three sites of different degree of water movement in the intertidal zone and sublittoral fringe during 1975 and 1976. From 93,916 organisms belonging to 172 species, 5,331 were Crepidula, the most abundant among sessile species. Also, Crepidula constitutes a substratum to attachment of Amphiroa, accounting for 30% of total phytal area. There was a positive correlation between the growth of shell and epizoic alga. Higher level of the phytal belt was more suitable for attachment and/or growth of the epizoic alga, without influence from water movement or season of the year. This association depends on the external morphology of the shell, filter-feeding habit, high adhesive power and lacking of mechanisms avoiding attachment of epizoics of Crepidula. Exuberant growth of the epizoic tuft over Crepidula female shell would constitute camouflage and protection of offsprings against predators.

  2. Occurrence of Chaetogaster limnaei K. von Baer, 1927 (Oligochaeta, Naididae) associated with Gastropoda mollusks in horticultural channels in Southeastern Brazil / Ocorrência de Chaetogaster limnaei K. von Baer, 1927 (Oligochaeta, Naididae) associado com moluscos Gastropoda em canais de horticultura no sudeste do Brasil

    Scientific Electronic Library Online (English)

    RT., Martins; RG., Alves.

    1055-10-01

    Full Text Available O objetivo deste estudo foi avaliar a presença de Chaetogaster limnaei K. von Baer, 1927 em quatro espécies de moluscos coletadas em canais de irrigação de uma horticultura no município de Juiz de Fora, Minas Gerais, sudeste do Brasil. As coletas foram realizadas de junho de 2005 a janeiro de 2006. [...] Dentre as quatro espécies de moluscos analisadas, apenas em Pomacea lineata (Spix, 1827) não foi detectada a presença de C. limnaei. Foram registrados 320 espécimes de C. limnaei associadas a Aplexa rivalis Mastou & Rackett, 1898, Lymnaea columella Say, 1818 e Biomphalaria sp., sendo esta última a espécie de molusco com o maior número de Naididae associados. Abstract in english The aim of this study was to evaluate the presence of Chaetogaster limnaei K. von Baer, 1927 in four species of mollusks collected in irrigation channels of a horticultural garden in the city of Juiz de Fora, Minas Gerais State, Southeastern Brazil. The collections were made from June 2005 to Januar [...] y 2006. Of the four species of mollusks analysed, we could not detect the presence of C. limnaei in Pomacea lineata (Spix, 1827). There were recorded 320 specimens of C. limnaei in association with Aplexa rivalis Mastou & Rackett, 1898, Lymnaea columella Say, 1818 and Biomphalaria sp., the latter having the highest number of associated Naididae.

  3. Strepsodiscus austrinus Pinilla et al. (Gastropoda, Bellerophontoidea) y faunas asociadas del Cámbrico tardío del Angosto de la Quesera, provincia de Salta / Strepsodiscus austrinus Pinilla et al. (Gastropoda, Bellerophontoidea) y faunas asociadas del Cámbrico tardío del Angosto de la Quesera, Provincia de Salta

    Scientific Electronic Library Online (English)

    Karina, Pinilla; Nora, Sabattini; Guillermo F, Aceñolaza; M. Franco, Tortello; Susana B, Esteban.

    2009-06-01

    Full Text Available En el presente trabajo se realiza un estudio paleontológico en la Formación Lampazar que aflora en la localidad Angosto de La Quesera, franja oeste de la Cordillera Oriental, provincia de Salta. En dicha unidad se ha registrado el género Strepsodiscus Knight (Gastropoda, Bellerophontoidea), el cual [...] ha reforzado anteriores investigaciones que revelan una edad cámbrica tardía para la asociación fosilífera y los estratos portadores. En esta oportunidad se realiza un diagnóstico de la morfología funcional de la especie Strepsodicus austrinus Pinilla et al., la cual se documenta asociada a trilobites característicos de la Biozona de Parabolina frequens argentina [Parabolina (Neoparabolina) frequens (Barrande), Olenidae indet., Micragnostus sp.], Hyolitha gen et sp. indet., placas de crinoideos y trazas fósiles de la ichnofacies de Cruziana. Abstract in english A paleontological study on the Lampazar Formation outcropping at Angosto de la Quesera locality, western Cordillera Oriental, Salta Province, is achieved. The occurrence of the genus Strepsodiscus Knight (Gastropoda, Bellerophontoidea) supports a latest Cambrian age for the formation. This paper inc [...] ludes an analysis of the functional morphology of Strepsodiscus austrinus Pinilla et al., which is associated with some characteristic trilobites of the Parabolina frequens argentina Zone [Parabolina (Neoparabolina) frequens (Barrande), Olenidae indet., Micragnostus sp.], Hyolitha gen et sp. indet, crinoid plates, and trace fossils of the archetypical Cruziana Ichnofacies.

  4. Gastropoda (Mollusca) associated to Sargassum sp. beds in São Sebastião Channel - São Paulo, Brazil / Gastropoda (Mollusca) associados a bancos deSargassum sp. no Canal de São Sebastião - São Paulo, Brasil

    Scientific Electronic Library Online (English)

    Pedro Augusto dos Santos, Longo; Marjorie Cattaneo, Fernandes; Fosca Pedini Pereira, Leite; Flávio Dias, Passos.

    2014-12-01

    Full Text Available O fital é caracterizado pela formação de bancos de algas marinhas e uma grande diversidade de espécies associadas, estando a malacofauna entre seus principais componentes. Com o objetivo de registrar as assembleias de gastrópodes associadas è alga parda Sargassum C. Agardh, 1820, este estudo foi rea [...] lizado no Canal de São Sebastião, litoral norte do estado de São Paulo, e áreas próximas. Um total de 13945 indivíduos foram identificados, pertencentes a 35 famílias e 62 espécies. Em termos de abundância, Cerithiidae, Phasianellidae e Columbellidae foram as famílias mais representativas, com 34, 33 e 17% do total de indivíduos coletados, respectivamente. Bittiolum varium (Pfeiffer, 1840) (Cerithiidae) e Eulithidium affine (C. B. Adams, 1850) (Phasianellidae) foram as espécies dominantes, seguidas pelos columbelídeos Mitrella dichroa (G. B. Sowerby I, 1844), Anachis fenneli Radwin, 1968 e Costoanachis sertulariarium (d'Orbigny, 1839). Entre as espécies pouco abundantes, algumas podem ser consideradas como de ocorrência ocasional, enquanto outras parecem ser típicas deste ambiente, porém raras. A presença de formas juvenis mostrou-se muito recorrente para a maioria das espécies, o que parece indicar que a alga pode atuar como berçário. Os valores expressivos encontrados, tanto para a abundância de indivíduos como para o número de espécies, ilustram a grande importância ecológica apresentada por este ambiente para as espécies de gastrópodes. Abstract in english The phytal is characterized by the formation of seaweed beds and a great diversity of associated species, the malacofauna being one of its main components. Aiming to record the species of Gastropoda associated to the brown algae Sargassum sp. C. Agardh, 1820, this study was carried out in São Sebast [...] ião Channel, northern coast of São Paulo, and nearby areas. A total of 13945 individuals were identified, belonging to 35 families and 62 species. Cerithiidae, Phasianellidae and Columbellidae were the most abundant families, represented by 34, 33 and 17% of the total collected individuals, respectively. Bittiolum varium (Pfeiffer, 1840) (Cerithiidae) and Eulithidium affine (C. B. Adams, 1850) (Phasianellidae) are the dominant species, followed by the columbelids Mitrella dichroa (G. B. Sowerby I, 1844), Anachis fenneli Radwin, 1968 and Costoanachis sertulariarium (d'Orbigny, 1839). Among the least abundant species, some of them may be considered as of fortuitous occurrences, while others seem to be typical in those habitats, although rare. The presence of juvenile specimens was recurrent, this indicating that the algae can function as a nursery for most of these species. The expressive values found, for both abundance and number of species, illustrate the great ecological importance of the phytal habitats for the gastropod species.

  5. Daños por depredación y tamaño de concha del caracol diádromo Neritina virginea (Gastropoda: Neritidae en el Río Mameyes, Puerto Rico

    Directory of Open Access Journals (Sweden)

    Juan Felipe Blanco-Libreros

    2009-12-01

    Full Text Available Se compararon las abundancias y tamaños de conchas del gasterópodo Neritina virginea de acuerdo a los daños presentados en especimenes vivos y muertos (n= 5066 recolectados en el río Mameyes, Puerto Rico (Antillas Mayores. Se observaron daños por depredación de aves y camarones, y signos de erosión por la acción del raspado de la rádula por parte de otros individuos de la misma especie. La depredación fue aparentemente baja (Predator damage and shell size on the diadromous snail Neritina virginea (Gastropoda: Neritidae in the Mameyes River, Puerto Rico. We compared predators’ damage with shell size in live individuals and empty shells (n=5066 of the snail Neritina virginea in the Mameyes River (Puerto Rico, Greater Antilles. According to the literature and direct observations, damages on empty shells were attributed to predation by aquatic birds (e.g. Gallinula chloropus and decapods (e.g. Macrobrachium spp., while damages on live individuals were due to rasping by co-specifics and erosion. Predation by decapods and birds, as estimated by the proportion of empty shells, was low (2 and 0.36%, respectively. Shell size was significantly different between types of predators (range: decapods: 3.5-15.0mm, birds: 8.1-19.4mm. By comparing sizes of the empty shells and the live individuals, we concluded that decapods specialize on large groups of small migratory juveniles, while birds specialize on the largest resident individuals. Worn shells were highly frequent in both empty shells and live individuals, and sizes did not differ between samples. A comparison by slow-flow and fast-flow habitats showed that predators do not discriminate shell sizes between environments. However, the frequency of damage by birds and decapods was greater under slow-flow conditions. Despite of the little contribution of predation to the population dynamics in this species, predation might be an important driver of size-dependent behavioral responses such as upstream migration and microhabitat selection. Rev. Biol. Trop. 57 (4: 1069-1080. Epub 2009 December 01.

  6. Daños por depredación y tamaño de concha del caracol diádromo Neritina virginea (Gastropoda: Neritidae) en el Río Mameyes, Puerto Rico

    Scientific Electronic Library Online (English)

    Juan Felipe, Blanco-Libreros; Andrea, Arroyave-Rincón.

    1069-10-01

    Full Text Available Se compararon las abundancias y tamaños de conchas del gasterópodo Neritina virginea de acuerdo a los daños presentados en especimenes vivos y muertos (n= 5066) recolectados en el río Mameyes, Puerto Rico (Antillas Mayores). Se observaron daños por depredación de aves y camarones, y signos de erosió [...] n por la acción del raspado de la rádula por parte de otros individuos de la misma especie. La depredación fue aparentemente baja ( Abstract in english Predator damage and shell size on the diadromous snail Neritina virginea (Gastropoda: Neritidae) in the Mameyes River, Puerto Rico. We compared predators’ damage with shell size in live individuals and empty shells (n=5066) of the snail Neritina virginea in the Mameyes River (Puerto Rico, Greater An [...] tilles). According to the literature and direct observations, damages on empty shells were attributed to predation by aquatic birds (e.g. Gallinula chloropus) and decapods (e.g. Macrobrachium spp.), while damages on live individuals were due to rasping by co-specifics and erosion. Predation by decapods and birds, as estimated by the proportion of empty shells, was low (2 and 0.36%, respectively). Shell size was significantly different between types of predators (range: decapods: 3.5-15.0mm, birds: 8.1-19.4mm). By comparing sizes of the empty shells and the live individuals, we concluded that decapods specialize on large groups of small migratory juveniles, while birds specialize on the largest resident individuals. Worn shells were highly frequent in both empty shells and live individuals, and sizes did not differ between samples. A comparison by slow-flow and fast-flow habitats showed that predators do not discriminate shell sizes between environments. However, the frequency of damage by birds and decapods was greater under slow-flow conditions. Despite of the little contribution of predation to the population dynamics in this species, predation might be an important driver of size-dependent behavioral responses such as upstream migration and microhabitat selection. Rev. Biol. Trop. 57 (4): 1069-1080. Epub 2009 December 01.

  7. Novel Animal Defenses against Predation: A Snail Egg Neurotoxin Combining Lectin and Pore-Forming Chains That Resembles Plant Defense and Bacteria Attack Toxins

    OpenAIRE

    Dreon, Marcos S.; Frassa, Mari?a Victoria; Ceoli?n, Marcelo Rau?l; Ituarte, Santiago; Qiu, Jian-wen; Sun, Jin; Ferna?ndez, Patricia Elena; Heras, Horacio

    2013-01-01

    Although most eggs are intensely predated, the aerial egg clutches from the aquatic snail Pomacea canaliculata have only one reported predator due to unparalleled biochemical defenses. These include two storage-proteins: ovorubin that provides a conspicuous (presumably warning) coloration and has antinutritive and antidigestive properties, and PcPV2 a neurotoxin with lethal effect on rodents. We sequenced PcPV2 and studied whether it was able to withstand the gastrointestinal environment and ...

  8. Human Angiostrongyliasis Outbreak in Dali, China

    OpenAIRE

    Lv, Shan; Zhang, Yi; Chen, Shao-rong; Wang, Li-Bo; Fang, Wen; Chen, Feng; Jiang, Jin-Yong; Li, Yuan-Lin; Du, Zun-Wei; Zhou, Xiao-nong

    2009-01-01

    Angiostrongyliasis, caused by the rat lungworm Angiostrongylus cantonensis, is a potentially fatal food-borne disease. It is endemic in parts of Southeast Asia, the Pacific Islands, Australia, and the Caribbean. Outbreaks have become increasingly common in China due to the spread of efficient intermediate host snails, most notably Pomacea canaliculata. However, infections are difficult to detect since the disease has a rather long incubation period and few diagnostic clinical symptoms. Reliab...

  9. Verspreiding van Burnupia capensis (Walker, 1912 en Burnupia stenochorias (Melvill & Ponsonby, 1903 (Gastropoda: Ancylidae in Suid-Afrika

    Directory of Open Access Journals (Sweden)

    Kenné de Kock

    2009-09-01

    Full Text Available Die voorkoms van verteenwoordigers van die Ancylidae in Suid-Afrika is reeds in 1848 gerapporteer. Die eerste omvattende studie van hierdie familie in Suid-Afrika is egter eers in 1923 gepubliseer. Alhoewel verskeie bydraes sedertdien gepubliseer is, is verskeie outeurs van mening dat bestaande kennis oor die Ancylidae steeds gebrekkig is en dat hersiening nie net op spesievlak nie maar ook op genus-vlak nodig is. Tans is daar 14 Burnupia spesies op rekord in die databasis van die Nasionale Varswaterslakversameling (NVWSV. Hierdie bydrae handel oor die geogra? ese verspreiding en habitats van B. capensis en B. stenochorias die twee Ancylidae spesies waarvan die meeste versamelpunte in die databasis van die NVWSV op rekord is en wat ook die mees wydverspreide geogra? ese verspreiding van hierdie familie vertoon. Alhoewel beide spesies in die meerderheid van die verskeidenheid van waterliggame wat in die databasis vermeld word, aangetref is, is die grootste getal monsters van albei in standhoudende riviere en spruite en op ’n klipperige substraat versamel. Albei spesies is nie gerapporteer uit die droër streke van Suid-Afrika nie waarskynlik as gevolg van ’n beperkte vermoë om desikkasie te kan oorleef in gebiede waar standhoudende habitats ’n uitsondering is. Resultate dui daarop dat hoogte bo seevlak en aard van die substraat ’n belangrike rol gespeel het in die daarstelling van hul gedokumenteerde geogra? ese verspreiding soos weerspieël deur die rekords in die NVWSV. Min is oor die bewaringstatus van die Ancylidae van Suid-Afrika bekend, maar die karige inligting wat wel tot ons beskikking is, dui op rede tot kommer. Om sinvolle uitsprake oor die bewaringstatus en spesiediversiteit van die Mollusca van Suid-Afrika te kan maak, word aanbeveel dat van die versamelpunte op rekord weer besoek behoort te word waarna die resultate met die bestaande rekords in die databasis van die NVWSV vergelyk kan word.

     

     

    Abstract
    Distribution of Burnupia capensis (Walker, 1912 and Burnupia stenochorias (Melvill & Ponsonby, 1903 (Gastropoda: Ancylidae in South Africa The presence of Ancylidae in South Africa was established as early as 1848 but the ?rst comprehensive study on this family was reported in 1923. This author came to the conclusion that extensive work still had to be done before it could be declared that knowledge pertaining to the South African representatives of this family could be considered as satisfactory. Another important contribution on South African Ancylidae was published in 1939. After a detailed morphological and histological study on Burnupia mooiensis three decades later the authors stated that the axonomy of the Ancylidae still remained unsatisfactory, a view that was supported by authors as recently as 2002. The National Freshwater Snail Collection (NFSC was established in 1956 but he oldest sample of Ancylidae on record dates back to 1954 and at present 14 species of Burnupia are represented in the database of the NFSC. This contribution deals with the geographical distribution and speci?c characteristics of the habitats of B. capensis and B. stenochorias the two most widespread species of this genus in South Africa. Very little is known of the conservation status of the Ancylidae of this country but some results pertaining to this subject are brie?y discussed. Burnupia species are relatively inconspicuous organisms that are usually attached to solid objects on the substratum or aquatic vegetation and need to be speci? cally looked for during surveys. Personnel of government authorities and municipalities who made substantial contributions to the number of samples in the NFSC therefore received special training in sampling echniques during workshops. Identi?cation of the specimens was largely based on shell and radula characteristics and on he location of the site of collection. Only samples of which the sampling sites could be located on the 1:250 000 topo cadastral map se

  10. Present status of the endangered limpet Cymbula nigra (Gastropoda, Patellidae in Ceuta: how do substrate heterogeneity and area accessibility affect population structure?

    Directory of Open Access Journals (Sweden)

    Rivera–Ingraham, G. A.

    2011-12-01

    Full Text Available Cymbula nigra (Gastropoda, Patellidae is a threatened giant patellid limpet found on the North African coast from Namibia to Algeria. The objective of this study was to estimate the total number of individuals present in Ceuta (Strait of Gibraltar and to determine the effect of certain physical parameters on population structure and abundance. Between 2006 and 2010 we conducted an exhaustive census in the area. Results indicate that Ceuta could be home to 48,473 individuals. The most important populations were recorded on the North Bay, characterized by its Atlantic influence. While for other similar species, such as Patella ferruginea, human accessibility to the area plays an important role in determining the structure of populations, we found that substrate roughness (small scale topographic heterogeneity is the main determining factor in this species. Populations located on medium to low topographic heterogeneity substrates showed higher percentages of medium and large size individuals. However, recruitment rates did not differ between substrata of different roughness. Finally, and through the analysis of the C. nigra populations located on some recently constructed jetties, we obtained interesting new data regarding individual growth rates, thus contributing to our knowledge of the population structure of the species.

  11. Relationship between anti-oxidant capacity and manganese accumulation in the soft tissues of two freshwater molluscs: Unio pictorum mancus (Lamellibranchia, Unionidae and Viviparus ater (Gastropoda, Prosobranchia

    Directory of Open Access Journals (Sweden)

    Oscar RAVERA

    2005-08-01

    Full Text Available Manganese is an element of great importance in the life cycle of plants and animals. For example, it plays an essential role as an activator of various enzymatic systems such as isoenzymes of superoxide dismutase. Freshwater Unionidae concentrate relatively large amounts of manganese in their tissues, but little is known about the physiological role of this metal. The aim of this research is to acquire a better knowledge of the role of manganese in molluscs which accumulate large amounts of this metal and in those with low manganese concentrations. As manganese is one of the metals present in the superoxide molecule, the possible relationship between manganese concentration in the soft tissues of molluscs and the antioxidant capacity of the metal can usefully be tested. To this end two species of molluscs were analysed: Unio pictorum mancus (Lamellibranchia, Unionidae, which is very rich in manganese, and Viviparus ater (Gastropoda, Prosobranchia which has a low manganese content. The adults of both species were analysed for manganese concentration by ICP, and for antioxidant capacity as RAC (Relative Antioxidant Capacity by a superoxide dismutase method. The results clearly demonstrate the active role played by manganese against free radicals and consequently the important role of the metal in protecting Unio against oxidative stress. The low concentration of manganese in Viviparus may be the result of the effective excretion of this metal, as was found for ruthenium.

  12. An integrative taxonomic investigation of the diversity of digenean parasites infecting the intertidal snail Austrolittorina unifasciata Gray, 1826 (Gastropoda: Littorinidae) in Australia.

    Science.gov (United States)

    O'Dwyer, Katie; Faltýnková, Anna; Georgieva, Simona; Kostadinova, Aneta

    2015-06-01

    We investigated for the first time the digenean parasites of Austrolittorina unifasciata Gray (Gastropoda: Littorinidae), a periwinkle snail inhabiting the rocky shores of Australia. Here we present detailed morphological descriptions and molecular data (sequences for the mitochondrial cox1 and the nuclear 28S rRNA gene) for the cercariae and intramolluscan stages of the digenean parasites found. Five species, one each of the families Notocotylidae Lühe, 1909, Gorgocephalidae Manter, 1966 and Philophthalmidae Looss, 1899, and two of the family Renicolidae Dollfus, 1939, were recorded and characterised molecularly. Phylogenetic analyses at the superfamily level provided evidence for the familial and generic affiliation of the species and their relationships with congeners. This study is the first to provide data on the life cycle of a species of the family Gorgocephalidae, a parasite of kyphosid fish for which only adult stages had, thus far, been described. The relatively high prevalence of this species allowed mapping of the cox1 haplotype distribution of Gorgocephalus sp. Aus along the southern coast of New South Wales. PMID:25866083

  13. Patterns of larval distribution and settlement of Concholepas concholepas (Bruguiere, 1789) (Gastropoda, Muricidae) in fjords and channels of southern Chile / Patrones de distribución de larvas y asentamiento de Concholepas concholepas (Bruguiere, 1789) (Gastropoda, Muricidae) en fiordos y canales del sur de Chile

    Scientific Electronic Library Online (English)

    CARLOS, MOLINET; ALEJANDRA, ARÉVALO; MARÍA TERESA, GONZÁLEZ; CARLOS A., MORENO; JAVIER, ARATA; EDWIN, NIKLITSCHEK.

    2005-09-01

    Full Text Available Concholepas concholepas (Mollusca, Gastropoda, Muricidae) se distribuye entre las costas del sur de Perú y extremo sur de Chile. Prácticamente todos los estudios sobre este gastrópodo han sido realizados en costas expuestas, sin considerar los fiordos y canales del sur de Chile, a pesar de que estos [...] representan aproximadamente el 95 % de la línea costera de este país. Aunque se ha publicado un importante volumen de literatura sobre C. concholepas, existen escasos antecedentes acerca de su desarrollo larval temprano en condiciones naturales, principalmente debido a que estos estadios han sido escasamente recolectados en la naturaleza. Este estudio es el primer intento por determinar los patrones de abundancia espacial y temporal de larvas de C. concholepas a través de su desarrollo hasta el asentamiento, en su ambiente natural. Para ello, fueron recolectadas muestras de plancton semanalmente en superficie y 8 m de profundidad en cuatro canales del sur de Chile. Temperatura y salinidad fueron registradas simultáneamente en cada sector. El asentamiento fue cuantificado usando un sustrato artificial en los cuatro sectores. En este estudio se observó que el desarrollo larval de C. concholepas ocurre durante todo el año en las aguas interiores del sur de Chile, observándose estados tempranos principalmente entre agosto y marzo, estados competentes entre junio y agosto, y asentamiento entre julio y agosto. Así, C. concholepas parece tener un largo periodo de desarrollo larval cuya duración fue estimada entre 6 a 12 meses en este estudio. Finalmente se sugiere que la hidrología local puede afectar el desarrollo larval de C. concholepas en esta región. Nuevas investigaciones oceanográficas y ecológicas son necesarias para responder las interrogantes e hipótesis surgidas de este estudio Abstract in english The distribution of Concholepas concholepas (Mollusca, Gastropoda, Muricidae) is limited to the coasts of Chile and southern Peru. Almost all studies of this gastropod have been carried out in open coastal systems, rather than the fjords and channels of southern Chile, despite the fact that this are [...] a represents ca. 95 % of the total coastline in this country. Although there is a large volume of background literature on C. concholepas, almost nothing is published about early larval development under natural conditions, mostly because early veligers have rarely been found in nature. This study is the first attempt to determine the spatial and temporal abundance and size patterns of C. concholepas larvae in their natural environment throughout all of their developmental stages until they settle. Weekly plankton samples were obtained at the surface and at 8 m depth in four locations in southern Chile in combination with temperature and salinity records in each location. Settlement was quantified using artificial substrates in all locations. We have observed that C. concholepas larval development occurs throughout the entire year in Chilean inland seas, with early veliger larvae being released mostly from August to March, reaching the competent stage around June to August, and settling between July and August. Thus, larvae appear to have a long planktonic development that can last between 6 and 12 months. Differences in local hydrology could affect larval development of C. concholepas in this region. Further oceanographic and ecological investigation is necessary in order to answer the questions and hypotheses originated from this study

  14. Patterns of larval distribution and settlement of Concholepas concholepas (Bruguiere, 1789 (Gastropoda, Muricidae in fjords and channels of southern Chile Patrones de distribución de larvas y asentamiento de Concholepas concholepas (Bruguiere, 1789 (Gastropoda, Muricidae en fiordos y canales del sur de Chile

    Directory of Open Access Journals (Sweden)

    CARLOS MOLINET

    2005-09-01

    Full Text Available The distribution of Concholepas concholepas (Mollusca, Gastropoda, Muricidae is limited to the coasts of Chile and southern Peru. Almost all studies of this gastropod have been carried out in open coastal systems, rather than the fjords and channels of southern Chile, despite the fact that this area represents ca. 95 % of the total coastline in this country. Although there is a large volume of background literature on C. concholepas, almost nothing is published about early larval development under natural conditions, mostly because early veligers have rarely been found in nature. This study is the first attempt to determine the spatial and temporal abundance and size patterns of C. concholepas larvae in their natural environment throughout all of their developmental stages until they settle. Weekly plankton samples were obtained at the surface and at 8 m depth in four locations in southern Chile in combination with temperature and salinity records in each location. Settlement was quantified using artificial substrates in all locations. We have observed that C. concholepas larval development occurs throughout the entire year in Chilean inland seas, with early veliger larvae being released mostly from August to March, reaching the competent stage around June to August, and settling between July and August. Thus, larvae appear to have a long planktonic development that can last between 6 and 12 months. Differences in local hydrology could affect larval development of C. concholepas in this region. Further oceanographic and ecological investigation is necessary in order to answer the questions and hypotheses originated from this studyConcholepas concholepas (Mollusca, Gastropoda, Muricidae se distribuye entre las costas del sur de Perú y extremo sur de Chile. Prácticamente todos los estudios sobre este gastrópodo han sido realizados en costas expuestas, sin considerar los fiordos y canales del sur de Chile, a pesar de que estos representan aproximadamente el 95 % de la línea costera de este país. Aunque se ha publicado un importante volumen de literatura sobre C. concholepas, existen escasos antecedentes acerca de su desarrollo larval temprano en condiciones naturales, principalmente debido a que estos estadios han sido escasamente recolectados en la naturaleza. Este estudio es el primer intento por determinar los patrones de abundancia espacial y temporal de larvas de C. concholepas a través de su desarrollo hasta el asentamiento, en su ambiente natural. Para ello, fueron recolectadas muestras de plancton semanalmente en superficie y 8 m de profundidad en cuatro canales del sur de Chile. Temperatura y salinidad fueron registradas simultáneamente en cada sector. El asentamiento fue cuantificado usando un sustrato artificial en los cuatro sectores. En este estudio se observó que el desarrollo larval de C. concholepas ocurre durante todo el año en las aguas interiores del sur de Chile, observándose estados tempranos principalmente entre agosto y marzo, estados competentes entre junio y agosto, y asentamiento entre julio y agosto. Así, C. concholepas parece tener un largo periodo de desarrollo larval cuya duración fue estimada entre 6 a 12 meses en este estudio. Finalmente se sugiere que la hidrología local puede afectar el desarrollo larval de C. concholepas en esta región. Nuevas investigaciones oceanográficas y ecológicas son necesarias para responder las interrogantes e hipótesis surgidas de este estudio

  15. Scientific Opinion on the assessment of the potential establishment of the apple snail in the EU

    Directory of Open Access Journals (Sweden)

    EFSA Panel on Plant Health (PLH

    2013-12-01

    Full Text Available EFSA requested the PLH Panel to review the current state of the art of the biology and ecology of apple snails, reported in this opinion, and to perform an environmental risk assessment for validation of the Plant Health environment guidance document, which will be provided in a second opinion. The Panel presents in this opinion the current state of the art of the biology of apple snails, and develops and uses a population dynamics model to assess the potential establishment of apple snails in the EU. A thorough review of the literature on the biology of Pomacea canaliculata and P. maculata was performed to collect information and data on life history characteristics related to temperature, which was used in the population dynamics model. Although uncertainties on the systematics and taxonomy of the genus Pomacea remain, it is now acknowledged that Pomacea insularum is a synonym of P. maculata and can be undoubtedly differentiated from P. canaliculata. Natural spread occurs via rivers and canals, in which the snails crawl, drift, float and raft. Flooding increases spread. In addition, attachment to animals (e.g. birds, cattle, horses, deer and aquatic invertebrates results in spread. Human assistance results in spread through cultivation transport of rice seedlings, aquaculture, aquaria, boats, and agricultural field machinery. The potential distribution of P. canaliculata in Europe was obtained by calculating with the population dynamics model, the average snail abundance per year in each node of a grid of 0.25 ×  0.25 degrees covering Europe, which resulted in the following conclusions: (1 the area of potential establishment comprises wetlands of southern Europe (i.e. Spain, southern France, most of Italy and Greece and the Balkans up to the latitude of the Danube river, (2 the potential area of establishment includes the rice production areas in Europe.

  16. Fatal bacteremia due to immotile Vibrio cholerae serogroup O21 in Vientiane, Laos - a case report

    OpenAIRE

    Moore Catrin E; Lattana Olay; Vongsouvath Manivanh; Davong Viengmone; Arakawa Eiji; Nakatsu Masami; Phetsouvanh Rattanaphone; Nakamura Satoshi; Newton Paul N

    2008-01-01

    Abstract Background Human infections with non-O1, non-O139 V. cholerae have been described from Laos. Elsewhere, non cholera-toxin producing, non-O1, non-O139 V. cholerae have been described from blood cultures and ascitic fluid, although they are exceedingly rare isolates. Case presentation We describe a farmer who died with Vibrio cholerae O21 bacteremia and peritonitis in Vientiane, Laos, after eating partially cooked apple snails (Pomacea canaliculata) and mussels (Ligumia species). The c...

  17. Freshwater snails and schistosomiasis mansoni in the State of Rio de Janeiro, Brazil: I - metropolitan mesoregion

    Scientific Electronic Library Online (English)

    Silvana C, Thiengo; Monica A, Fernandez; M Fernanda, Boaventura; Carlos E, Grault; Heucler FR, Silva; Aline C, Mattos; Sonia B, Santos.

    2001-09-01

    Full Text Available In order to elaborate a planorbid chart of the State of Rio de Janeiro a survey of freshwater gastropods in the Metropolitan Mesoregion of this State was performed and revealed the occurrence of 20 species: Antillorbis nordestensis (Lucena, 1954); Biomphalaria glabrata (Say, 1818); Biomphalaria schr [...] ammi (Crosse, 1864); Biomphalaria straminea (Dunker, 1848); Biomphalaria tenagophila (Orbigny, 1835); Burnupia sp.; Drepanotrema anatinum (Orbigny, 1835); Drepanotrema cimex (Moricand, 1839); Drepanotrema lucidum (Pfeiffer, 1839); Ferrissia sp.; Gundlachia ticaga (Marcus & Marcus, 1962); Heleobia davisi Silva & Thomé, 1985; Lymnaea columella Say, 1817; Melanoides tuberculatus (Müller, 1774); Physa cubensis Pfeiffer, 1839; Physa marmorata Guilding, 1828; Pomacea sp.; Pomacea canaliculata (Lamarck, 1822); Pomacea lineata (Spix, 1827) and Pomacea sordida (Swainson, 1823). Among the planorbid species B. tenagophila was the most frequent, occurring in all municipalities surveyed. The present study extends the distribution of B. straminea in the State of Rio de Janeiro and reports new records for A. nordestensis, B. schrammi, G. ticaga, H. davisi and the genera Burnupia and Ferrissia. An account about the current transmission areas of schistosomiasis mansoni in this Mesoregion is presented as well.

  18. Preliminary Screening a Potential AChE Inhibitor in Thai Golden Shower (Leguminosae mimosoideae Extracts

    Directory of Open Access Journals (Sweden)

    Jakkaphun Nanuam

    2013-07-01

    Full Text Available Pesticides are used to control pests of agriculture products in many countries including Thailand. Since they can exert harmful effects not only on target pests but also on other useful organisms, alternative agents are investigated. We studied the capacity of the Thai golden shower (Leguminosae mimosoideae extracts (root and pod to inhibit acetyl cholinestarese (AChE in the golden apple snail (Pomacea canaliculata as a pest representative. The results showed that the percentage of AChE inhibition increased with increasing in exposure times. The inhibition expressed the same trend in both male and female apple snails. AChE inhibition was higher in extracts from root than from pod. Chromatography-Mass Spectrometer (GC-MS chromatograms demonstrated anthraquinone, an AChE inhibitor, in extracts of golden shower. Our data indicate that a potential AChE inhibitor tends to accumulate more in the root part than in the pod.

  19. The family Calyptraeidae in Peru (Gastropoda: Caenogastropoda

    Directory of Open Access Journals (Sweden)

    Carlos Paredes

    2008-12-01

    Full Text Available Rev. peru. biol. número especial 13(3: 177 - 184 (Julio 2007Error en la figura 1 y 2: las imágenes de las fotos se encuentran volteadas en 180°, es decir las fotos son imágenes especulares.Error in Figure 1 and 2: the images of the photos are turned 180°, ie. each photo is the mirror image.

  20. Monacha cartusiana (Gastropoda: Hygromiidae in South Bohemia

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    Pavel Pech

    2009-08-01

    Full Text Available The first record of non-indigenous expanding mollusc species Monacha cartusiana (O.F. Müller, 1774 is reported – the species was found on a dam of a coal-ash settling basin near ?eské Bud?jovice.

  1. Plesiophysa dolichomastix sp. n. (Gastropoda: Planorbidae)

    Scientific Electronic Library Online (English)

    W Lobato, Paraense.

    2002-06-01

    Full Text Available A new species of planorbid mollusc, Plesiophysa dolichomastix (Greek dolichos = long, mastix = flagellum), collected from Lagoa da Pedra, municipality of Santa Rosa, state of Goiás, Brazil (15°01'S, 47°13'W) is described. It is indistinguishable by the shell characters from the five congeneric speci [...] es described so far: P. striata (Orbigny, 1841), P. granulata ("Shuttleworth" Sowerby, 1873), P. guadeloupensis ("Fischer" Mazé, 1883), P. ornata (Haas, 1938) and P. hubendicki Richards & Ferguson, 1962. It differs from the anatomically studied species in the following characters: about 50 ovotestis diverticula, against 12 in granulata, 100 in ornata, unstated in hubendicki; and length of flagella - about as long as the penial complex -, against about 1/3 to 1/6 in the other three.

  2. Malacological assessment and natural infestation of Biomphalaria straminea (Dunker, 1848) by Schistosoma mansoni (Sambon, 1907) and Chaetogaster limnaei (K. von Baer, 1827) in an urban eutrophic watershed / Levantamento malacológico e infestação natural de Biomphalaria straminea (Dunker, 1848) por Schistosoma mansoni (Sambon, 1907) e Chaetogaster limnaei (K. von Baer, 1827) em uma bacia hidrográfica eutrofizada urbana (MG, Brasil)

    Scientific Electronic Library Online (English)

    M., Callisto; P., Moreno; J. F. Jr., Gonçalves; W. R., Ferreira; C. L. Z., Gomes.

    2005-05-01

    Full Text Available O objetivo deste estudo foi realizar um levantamento malacológico na bacia do reservatório de Ibirité, na região metropolitana de Belo Horizonte (Minas Gerais), e avaliar a taxa de infestação natural de Biomphalaria straminea (Gastropoda: Planorbidae)por Schistosoma mansoni (Platyhelminthes: Tremato [...] da) e Chaetogaster limnaei (Oligochaeta: Naididae). As amostragens foram realizadas de julho a agosto de 2002. Os espécimes de B. straminea coletados foram levados para o laboratório e as avaliações da taxa de infestação foram realizadas semanalmente. O levantamento malacológico identificou cinco espécies de moluscos presentes na bacia do reservatório: B. straminea, Physa marmorata, Lymnea sp., Melanoides tuberculatus e Pomacea austrum. As observações em laboratório mostraram que os espécimes de B. straminea estavam infectados somente por C. limnaei. Apesar de não ter sido encontrado S. mansoni, a presença desse planorbídeo deve ser vista com atenção, em decorrência da possibilidade de infecção com esquistossomose humana para a população local. Abstract in english The objective of this study was to perform a malacological assessment at the Ibirité reservoir watershed in the metropolitan region of Belo Horizonte (Minas Gerais) and to evaluate the natural infestation rate of Biomphalaria straminea (Gastropoda: Planorbidae)by Schistosoma mansoni (Platyhelminthes [...] : Trematoda) and Chaetogaster limnaei (Oligochaeta: Naididae). The samples were collected from July to August 2002. The B. straminea individuals collected were kept in the laboratory; the natural infestation rate by S. mansoni and C. limnaei was assessed weekly. The malacological assessment identified fivemollusk species present in the Ibirité reservoir watershed: B. straminea, Physa marmorata, Lymnea sp., Melanoides tuberculatus,and Pomacea austrum. Laboratory observations showed that the B. straminea individuals were infected by C. limnaei rather than S. mansoni. Although there was no infection of B. straminea by S. mansoni,presence of B. straminea in itself merits close attention due to possible risk of human schistosomiasis by the local population.

  3. Pseudosuccinea columella (Mollusca: Gastropoda: Lymnaeidae) en Camagüey / Pseudosuccinea columella (Mollusca: Gastropoda: Lymnaeidae) in Camagüey

    Scientific Electronic Library Online (English)

    Raisa, Vázquez Capote; Lorenzo, Diéguez Fernández; Ubaldo, del Risco Barrios; Rigoberto, Fimia Duarte; Antonio Alejandro, Vázquez Perera.

    2013-09-01

    Full Text Available Introduccion: la fasciolosis es una enfermedad emergente en el mundo, tiene un comportamiento esporádico en Cuba y afecta seriamente al ganado vacuno. Objetivo: reportar la presencia y distribución de Pseudosuccinea columella en la provincia de Camagüey, Cuba. Metodos: se encuestaron 455 criaderos n [...] aturales o potenciales de moluscos dulceacuícolas de la provincia Camagüey, mediante un colador de bronce de 15 cm con 1 mm de paso de malla durante 30 min, removiendo el sustrato fangoso y la vegetación colindante, sin reposición de los ejemplares capturados. Resultados: se reporta la especie en 23 cuerpos de agua del total encuestado (5,05 %), que son 15 lagunas (65,21 %), 4 arroyos (17,39 %), 3 ríos (13,04 %) y 1 micropresa (4,36 %). El municipio con mayor positividad resultó Camagüey con 16 en total (69,56 %). Pseudosuccinea columella se encontró relacionada únicamente con Physa acuta en 5 de los acuatorios positivos a la especie (21,73 %), siempre en bajas densidades. Conclusiones: la limitada distribución de Pseudosuccinea columella, disminuye su relevancia en comparación con Galba cubensis, considerada el más importante hospedero intermediario de Fasciola hepatica en Cuba. La acción de las diferentes variables abióticas, como probables factores limitantes o dispersivos de Pseudosuccinea columella en los diferentes acuatorios camagüeyanos, está siendo objeto de investigación. Abstract in english Introduction: fascioliasis is an emerging disease worldwide. In Cuba its occurrence is sporadic, seriously affecting cattle. Objective: report the presence and distribution of Pseudosuccinea columella in the province of Camagüey, Cuba. Methods: a survey was conducted of 455 actual or potential fresh [...] water mollusk breeding sites in the province of Camagüey, using a 1-mm-mesh bronze sieve 15 cm in diameter for 30 min. Both the muddy substratum and the adjoining vegetation were removed without replacing the specimens captured. Results: the species was found in 23 of the water bodies surveyed (5.05 %), namely 15 inland lagoons (65.21 %), 4 streams (17.39 %), 3 rivers (13.04 %) and 1 micro-dam (4.36 %). The municipality with the highest positivity rate was Camagüey with 16 (69.56 %). Pseudosuccinea columella was found to be related only to Physa acuta in 5 of the positive water bodies (21.73 %), and in all cases its density was low. Conclusions: the limited distribution of Pseudosuccinea columella lowers its relevance in comparison with Galba cubensis, which is considered to be the main intermediary host of Fasciola hepatica in Cuba. Research is currently in progress into the role of the various abiotic variables as probable factors limiting or dispersing Pseudosuccinea columella in Camagüey water bodies.

  4. The Use of Golden Snail (Pomacea sp. as Animal Feed in the Philippines

    Directory of Open Access Journals (Sweden)

    Serra, AB.

    1997-01-01

    Full Text Available The golden snail is introduced to the Philippines in early 80's for culture as food source. This herbivorous snail, a voracious feeder of live and fresh plant materials become a serious rice pest. Its elimination in the ecosystems is impossible. To use them as animal feed is much better alternative for their control and more environmentally friendly than the use of chemicals. Thus, this mini review paper aimed to collate any existing information on the use of golden snail as animal feed. The different meal forms that can be extracted are golden snail meal (30 % calcium and 15 % crude protein, golden snail meat meal (62 % crude protein and 3336 kcal/kg and golden shell meal (35 % calcium. Feeding trials indicate that golden snail meal can be a part of swine and chicken layer diets up to 15 %. Golden snail meat meal can be a part of broiler chicken diet up to 12 %. Feeding fresh and ground golden snail to ducks can replace 50 % of their diet under total confinement system. Whereas, golden snail meat meal (75 % of the diet plus rice bran can be beneficially fed to tilapia. With the information collated, golden snail can be a promising animal feed in the Philippines.

  5. The Use of Golden Snail (Pomacea sp.) as Animal Feed in the Philippines

    OpenAIRE

    Serra, Ab

    1997-01-01

    The golden snail is introduced to the Philippines in early 80's for culture as food source. This herbivorous snail, a voracious feeder of live and fresh plant materials become a serious rice pest. Its elimination in the ecosystems is impossible. To use them as animal feed is much better alternative for their control and more environmentally friendly than the use of chemicals. Thus, this mini review paper aimed to collate any existing information on the use of golden snail as animal feed. The ...

  6. Composição das espécies de moluscos bentônicos nos reservatórios do baixo rio Tietê (São Paulo, Brasil) com uma avaliação do impacto causado pelas espécies exóticas invasoras / Species composition of benthic molluscs in the reservoirs of Low Tietê River (São Paulo, Brazil) with an evaluation of the impact of exotic invader species

    Scientific Electronic Library Online (English)

    Roberta S., França; Ana L., Suriani; Odete, Rocha.

    2007-03-01

    Full Text Available A composição taxonômica, a densidade e a distribuição espacial de moluscos bentônicos nos reservatórios do baixo rio Tietê (São Paulo) foram analisadas. A amostragem dos moluscos foi realizada em novembro de 2002 e agosto de 2003. As características físicas e químicas dos reservatórios também foram [...] avaliadas buscando-se correlacioná-las à composição taxonômica e à distribuição dos táxons através da Análise de Correspondência Canônica (ACC). A espécie exótica Melanoides tuberculata esteve distribuída em todas as porções amostradas e foi a espécie mais abundante, correspondendo a 65,9% ou mais da abundância total, sendo dominante em todos os reservatórios, com densidade máxima de 23753 ind.m-2 registrada na profundidade de 2 m da porção superior do reservatório de Nova Avanhandava. As demais espécies exóticas, Corbicula fluminea e Helisoma sp., foram bem menos abundantes e não foram registradas em todas as porções dos reservatórios. As espécies nativas foram Aylacostoma tenuilabris, Biomphalaria glabrata, B. intermedia, Physa cubensis e Pomacea canaliculata. Essas espécies representaram menos de 20% das espécies presentes nos reservatórios, ocorreram em abundância baixa e em densidades bem inferiores àquelas das espécies exóticas, principalmente em relação a M. tuberculata, podendo indicar o impacto das espécies exóticas invasoras sobre as populações nativas. Abstract in english The taxonomic composition, density and the spatial distribution of benthic molluscs in low Tietê, São Paulo reservoirs were analyzed in November 2002 and August 2003. The exotic species Melanoides tuberculata was distributed in all portions sampled and was the most abundant species, corresponding to [...] 65.9% or more of the total abundance, being dominant in all reservoirs, with a maximum density of 23,753 ind.m-2 recorded in the depth of 2 m, at the superior portion of Nova Avanhandava reservoir.The other exotic species, Corbicula fluminea and Helisoma sp., were much less abundant and they were not registered in all portions of the reservoirs. The native species were Aylacostoma tenuilabris, Biomphalaria glabrata, B. intermedia, Physa cubensis and Pomacea canaliculata. These species contributed with less than 20% of the total abundance of molluscs in the reservoirs, occurring in low densities, much inferior to those of the exotic species, mainly regarding M. tuberculata, possibly indicating the impact of the exotic invader species on the native populations.

  7. Reproduction of Omalonyx matheroni (Gastropoda: Succineidae) under laboratory conditions

    Scientific Electronic Library Online (English)

    Lângia, Montresor; Ana, Teixeira; Adriano, Paglia; Teofânia, Vidigal.

    2012-06-01

    Full Text Available The life histories of succineids have received relatively little attention. To evaluate life history characteristics of Omalonyx matheroni, we studied a Brazilian population (Reserva Particular do Patrimônio Natural Feliciano Miguel Abdala, in Caratinga, Minas Gerais, Brazil) under laboratory condit [...] ions. The aims of the present study were (1) to describe in detail an appropriate rearing method; (2) to investigate the effects of different temperature and photoperiod conditions; and (3) to assess the effects of self and cross-fertilization on the reproductive biology of these mollusks. We studied the oviposition site, the time to sexual maturity and the influences of photoperiod and temperature on reproductive parameters of O. matheroni reared under laboratory conditions. We tested three combinations of temperature and photoperiod, designated A, B and C (A: 25ºC, 24 hours of light; B: environmental conditions of temperature and photoperiod, characterized as follows: average máximum temperature=27.1ºC, average minimum temperature=18.3ºC, average day length=12.06 hours; and C: 25ºC, zero hours of light) and two rearing densities (I: isolated and G: grouped) on reproductive parameters (number of eggs per egg mass, number of unviable eggs per mass, egg mass incubation period, and duration of the hatching period). A total of 186 individuals and 565 egg masses were studied. Data were analyzed by Student’s t-test, two-way ANOVA and Chi-Square test. Eight generations were produced (March/2004-March/2006), from 35 field specimens, 91% of 3 197 eggs hatched. The time to sexual maturity was approximately three months for individuals reared in groups or in isolation (Student’s t-test: t=1.41, df=31, p=0.16); however, they differed significantly in weight (Student’s t-test: t=3.6, df=31, p

  8. Phylogenetic analysis of Biomphalaria tenagophila (Orbigny, 1835) (Mollusca: Gastropoda)

    Scientific Electronic Library Online (English)

    Liana K, Jannotti-Passos; Jeronimo C, Ruiz; Roberta L, Caldeira; Silvane MF, Murta; Paulo Marcos Z, Coelho; Omar S, Carvalho.

    2010-07-01

    Full Text Available Mitochondrial DNA of Biomphalaria tenagophila, a mollusc intermediate host of Schistosoma mansoni in Brazil, was sequenced and characterised. The genome size found for B. tenagophila was 13,722 bp and contained 13 messenger RNAs, 22 transfer RNAs (tRNA) and two ribosomal RNAs (rRNA). In addition to [...] sequencing, the mitochondrial DNA (mtDNA) genome organization of B. tenagophila was analysed based on its content and localization of both coding and non-coding regions, regions of gene overlap and tRNA nucleotide sequences. Sequences of protein, rRNA 12S and rRNA 16S nucleotides as well as gene organization were compared between B. tenagophila and Biomphalaria glabrata, as the latter is the most important S. mansoni intermediate host in Brazil. Differences between such species were observed regarding rRNA composition. The complete sequence of the B. tenagophila mitochondrial genome was deposited in GenBank (accession EF433576). Furthermore, phylogenetic relationships were estimated among 28 mollusc species, which had their complete mitochondrial genome deposited in GenBank, using the neighbour-joining method, maximum parsimony and maximum likelihood bootstrap. B. tenagophila was positioned at a branch close to B. glabrata and Pulmonata molluscs, collectively comprising a paraphyletic group, contrary to Opistobranchia, which was positioned at a single branch and constituted a monophyletic group.

  9. Familia Ellobiidae (Gastropoda: Archaeopulmonata en el litoral peruano

    Directory of Open Access Journals (Sweden)

    Carlos Paredes

    2013-05-01

    Full Text Available Se reportan 8 especies de Ellobiidae para la Costa Peruana, pertenecientes a las subfamilias Ellobiinae: Ellobium stagnale (Orbigny, 1835 y Sarnia frumentum Petit, 1842; Melampodinae: Melampus carolianus (Lesson, 1842, Melampus olivaceus Carpenter, 1857 y Detracia graminea Morrison, 1846; y Pedipedinae: Marinula acuta (Orbigny, 1835, Marinula concinna (C.B Adams, 1852 y Marinula pepita King, 1831. Seis especies viven asociadas al bosque de manglar en el departamento de Tumbes, y dos en las playas de canto rodado en los límites de la Provincia Peruana. Cuatro especies tropicales se registran por primera vez para el mar peruano: E. stagnale, M. olivaceus, D. graminea y M. acuta.

  10. Biomphalaria molluscs (Gastropoda: Planorbidae) in Rio Grande do Sul, Brazil

    OpenAIRE

    Michele Soares Pepe; Roberta Lima Caldeira; Omar dos Santos Carvalho; Gertrud Muller; Liana Konovaloff Jannotti-Passos; Alice Pozza Rodrigues; Hugo Leonardo Amaral; Maria Elisabeth Aires Berne

    2009-01-01

    The present study was aimed at characterising Biomphalaria species using both morphological and molecular (PCR-RFLP) approaches. The specimens were collected in 15 localities in 12 municipalities of the southern region of the state of Rio Grande do Sul, Brazil. The following species were found and identified: Biomphalaria tenagophila guaibensis, Biomphalaria oligoza and Biomphalaria peregrina. Specimens of the latter species were experimentally challenged with the LE Schistosoma mansoni strai...

  11. Biomphalaria molluscs (Gastropoda: Planorbidae) in Rio Grande do Sul, Brazil.

    Science.gov (United States)

    Pepe, Michele Soares; Caldeira, Roberta Lima; Carvalho, Omar dos Santos; Muller, Gertrud; Jannotti-Passos, Liana Konovaloff; Rodrigues, Alice Pozza; Amaral, Hugo Leonardo; Berne, Maria Elisabeth Aires

    2009-08-01

    The present study was aimed at characterising Biomphalaria species using both morphological and molecular (PCR-RFLP) approaches. The specimens were collected in 15 localities in 12 municipalities of the southern region of the state of Rio Grande do Sul, Brazil. The following species were found and identified: Biomphalaria tenagophila guaibensis, Biomphalaria oligoza and Biomphalaria peregrina. Specimens of the latter species were experimentally challenged with the LE Schistosoma mansoni strain, which showed to be refractory to infection. PMID:19820842

  12. Biomphalaria molluscs (Gastropoda: Planorbidae) in Rio Grande do Sul, Brazil

    Scientific Electronic Library Online (English)

    Michele Soares, Pepe; Roberta Lima, Caldeira; Omar dos Santos, Carvalho; Gertrud, Muller; Liana Konovaloff, Jannotti-Passos; Alice Pozza, Rodrigues; Hugo Leonardo, Amaral; Maria Elisabeth Aires, Berne.

    2009-08-01

    Full Text Available The present study was aimed at characterising Biomphalaria species using both morphological and molecular (PCR-RFLP) approaches. The specimens were collected in 15 localities in 12 municipalities of the southern region of the state of Rio Grande do Sul, Brazil. The following species were found and i [...] dentified: Biomphalaria tenagophila guaibensis, Biomphalaria oligoza and Biomphalaria peregrina. Specimens of the latter species were experimentally challenged with the LE Schistosoma mansoni strain, which showed to be refractory to infection.

  13. First records of Cecilioides tumulorum (Gastropoda: Ferussaciidae in Bulgaria

    Directory of Open Access Journals (Sweden)

    Dilian Georgiev

    2013-10-01

    Full Text Available First records of Cecilioides tumulorum (Bourguignat, 1956 in Bulgaria were reported: 1. deposits of Karabaiska River, near village of Sladun, Sakar Mountain; 2. deposits of Stara Reka River, near Peshtera town, Western Rhodopes Mountain; 3. deposits of Byala Reka River, near village of Mandritza, Eastern Rhodopes Mountain; 4. Ivaylovgrad town, Eastern Rhodopes Mountain. After this report, the known species from the genus Cecilioides in Bulgaria are: C. acicula, C. janii, C. spelaeus and C. tumulorum.

  14. Localities of valvatiform hydrobiids (Gastropoda: Hydrobiidae in Bulgaria

    Directory of Open Access Journals (Sweden)

    Dilian Georgiev

    2013-06-01

    Full Text Available In this paper three new localities of unidentified valvatiform hydrobiids are reported in Bulgaria: Glava Panega Spring (Zlatna Panega Town, Rushovata Cave (near Glogovo Village, and Mandrata Cave (near Chavdartsi Village.

  15. Histologia das glândulas salivares dos Limacoidea e Milacidae (Gastropoda, Pulmonata)

    OpenAIRE

    Leal-Zanchet Ana Maria

    2003-01-01

    The histology of the salivary glands of six species of Limacoidea, Boettgerilla pallens Simroth, 1912, Deroceras laeve (Müller, 1774), Deroceras reticulatum (Müller, 1774), Deroceras rodnae Grossu & Lupu, 1965, Malacolimax tenellus (Müller, 1774) and Lehmannia marginata (Müller, 1774), and a species of Milacidae, Tandonia budapestensis (Hazay, 1881) is comparatively described herein. In the glandular parenchyme four to five secretory cell types are distinguished and characterised, besides a c...

  16. Biomphalaria molluscs (Gastropoda: Planorbidae in Rio Grande do Sul, Brazil

    Directory of Open Access Journals (Sweden)

    Michele Soares Pepe

    2009-08-01

    Full Text Available The present study was aimed at characterising Biomphalaria species using both morphological and molecular (PCR-RFLP approaches. The specimens were collected in 15 localities in 12 municipalities of the southern region of the state of Rio Grande do Sul, Brazil. The following species were found and identified: Biomphalaria tenagophila guaibensis, Biomphalaria oligoza and Biomphalaria peregrina. Specimens of the latter species were experimentally challenged with the LE Schistosoma mansoni strain, which showed to be refractory to infection.

  17. The phylogeography of Indoplanorbis exustus (Gastropoda: Planorbidae in Asia

    Directory of Open Access Journals (Sweden)

    Diaz Jose L

    2010-07-01

    Full Text Available Abstract Background The freshwater snail Indoplanorbis exustus is found across India, Southeast Asia, central Asia (Afghanistan, Arabia and Africa. Indoplanorbis is of economic importance in that it is responsible for the transmission of several species of the genus Schistosoma which infect cattle and cause reduced livestock productivity. The snail is also of medical importance as a source of cercarial dermatitis among rural workers, particularly in India. In spite of its long history and wide geographical range, it is thought that Indoplanorbis includes only a single species. The aims of the present study were to date the radiation of Indoplanorbis across Asia so that the factors involved in its dispersal in the region could be tested, to reveal potential historical biogeographical events shaping the phylogeny of the snail, and to look for signs that I. exustus might be polyphyletic. Results The results indicated a radiation beginning in the late Miocene with a divergence of an ancestral bulinine lineage into Assam and peninsular India clades. A Southeast Asian clade diverged from the peninsular India clade late-Pliocene; this clade then radiated at a much more rapid pace to colonize all of the sampled range of Indoplanorbis in the mid-Pleistocene. Conclusions The phylogenetic depth of divergences between the Indian clades and Southeast Asian clades, together with habitat and parasitological differences suggest that I. exustus may comprise more than one species. The timescale estimated for the radiation suggests that the dispersal to Arabia and to Southeast Asia was facilitated by palaeogeographical events and climate change, and did not require human involvement. Further samples from Afghanistan, Africa and western India are required to refine the phylogeographical hypothesis and to include the African Recent dispersal.

  18. Description of the ootheca of Turbinella laevigata (Mollusca, Gastropoda)

    Scientific Electronic Library Online (English)

    Helena, Matthews-Cascon; Cristina de Almeida, Rocha-Barreira; Carlos, Meirelles; Gregorio, Bigatti; Pablo, Penchaszadeh.

    2009-04-01

    Full Text Available Turbinella laevigata é encontrada desde a zona entre marés até 40 m de profundidade, sendo endêmica do Brasil onde ocorre desde o Estado do Amapá até o Espírito Santo. O objetivo deste estudo foi descrever a ooteca de Turbinella laevigata. Quinze amostras foram coletadas na Praia de Olho d'Água, Mun [...] icípio de Icapuí e na Praia de Flexeiras, Município do Trairí, ambos no Estado do Ceará, Nordeste do Brasil, foram estudadas. As desovas de T. laevigata foram compostas por 15 +/- 1.4 SD cápsulas e mediram 63 +/- 6.4 SD mm de comprimento e 41 +/- 2.5 SD mm de largura. Todas as cápsulas estavam fixadas pela membrana basal, a qual tinha a extremidade modificada para se prender ao substrato. Elas possuem uma superfície concava e outra convexa, apresentando margens pregueadas, que se prolongavam até a membrana basal, à qual se uniam formando uma prega. Esta espécie aparentemente produz uma grande quantidade de ovos nutritivos. A concha dos juvenis mediu 6.4 +/- 0.7 SD mm de comprimento e apresentou uma protoconcha com 3 voltas. Abstract in english Turbinella laevigata is found since the intertidal zone up to 40 m depth, being endemic of Brazil where it occurs from the state of Amapá to the state of Espirito Santo. The objective of this study was to describe the ootheca of this species. Fifteen samples collected in the Olho d'Água Beach, City [...] of Icapuí and Fleixeiras Beach, City of Trairí, both in Ceará State, Northeast Brazil, were studied. The spawns were composed by 15 +/- 1.4 SD capsules and had 63 +/- 6.4 SD mm of length with 41 +/- 2.5 SD mm of width. They had a convex and a concave surface, and plaited edges that drew out until the basal membrane, to which they joined forming a medial ridge. This species apparently produced a high amount of nurse eggs. The early juveniles measured 6.4 +/- 0.7 SD mm of length and they presented a protoconch with three whorls.

  19. Description of the ootheca of Turbinella laevigata (Mollusca, Gastropoda

    Directory of Open Access Journals (Sweden)

    Helena Matthews-Cascon

    2009-04-01

    Full Text Available Turbinella laevigata is found since the intertidal zone up to 40 m depth, being endemic of Brazil where it occurs from the state of Amapá to the state of Espirito Santo. The objective of this study was to describe the ootheca of this species. Fifteen samples collected in the Olho d'Água Beach, City of Icapuí and Fleixeiras Beach, City of Trairí, both in Ceará State, Northeast Brazil, were studied. The spawns were composed by 15 +/- 1.4 SD capsules and had 63 +/- 6.4 SD mm of length with 41 +/- 2.5 SD mm of width. They had a convex and a concave surface, and plaited edges that drew out until the basal membrane, to which they joined forming a medial ridge. This species apparently produced a high amount of nurse eggs. The early juveniles measured 6.4 +/- 0.7 SD mm of length and they presented a protoconch with three whorls.Turbinella laevigata é encontrada desde a zona entre marés até 40 m de profundidade, sendo endêmica do Brasil onde ocorre desde o Estado do Amapá até o Espírito Santo. O objetivo deste estudo foi descrever a ooteca de Turbinella laevigata. Quinze amostras foram coletadas na Praia de Olho d'Água, Município de Icapuí e na Praia de Flexeiras, Município do Trairí, ambos no Estado do Ceará, Nordeste do Brasil, foram estudadas. As desovas de T. laevigata foram compostas por 15 +/- 1.4 SD cápsulas e mediram 63 +/- 6.4 SD mm de comprimento e 41 +/- 2.5 SD mm de largura. Todas as cápsulas estavam fixadas pela membrana basal, a qual tinha a extremidade modificada para se prender ao substrato. Elas possuem uma superfície concava e outra convexa, apresentando margens pregueadas, que se prolongavam até a membrana basal, à qual se uniam formando uma prega. Esta espécie aparentemente produz uma grande quantidade de ovos nutritivos. A concha dos juvenis mediu 6.4 +/- 0.7 SD mm de comprimento e apresentou uma protoconcha com 3 voltas.

  20. Neuromuscular development of Aeolidiella stephanieae Valdéz, 2005 (Mollusca, Gastropoda, Nudibranchia)

    DEFF Research Database (Denmark)

    Kristof, Alen; Klussmann-Kolb, Annette

    2010-01-01

    ABSTRACT: BACKGROUND: Studies on the development of the nervous system and the musculature of invertebrates have become more sophisticated and numerous within the last decade and have proven to provide new insights into the evolutionary history of organisms. In order to provide new morphogenetic data on opisthobranch gastropods we investigated the neuromuscular development in the nudibranch Aeolidiella stephanieae Valdéz, 2005 using immunocytochemistry as well as F-actin labelling in conjunction with confocal laser scanning microscopy (cLSM). RESULTS: The ontogenetic development of Aeolidiella stephanieae can be subdivided into 8 stages, each recognisable by characteristic morphological and behavioural features as well as specific characters of the nervous system and the muscular system, respectively. The larval nervous system of A. stephanieae includes an apical organ, developing central ganglia, and peripheral neurons associated with the velum, foot and posterior, visceral part of the larva. The first serotonergic and FMRFamidergic neural structures appear in the apical organ that exhibits an array of three sensory, flask-shaped and two non-sensory, round neurons, which altogether disappear prior to metamorphosis. The postmetamorphic central nervous system (CNS) becomes concentrated, and the rhinophoral ganglia develop together with the anlage of the future rhinophores whereas oral tentacle ganglia are not found. The myogenesis in A. stephanieae begins with the larval retractor muscle followed by the accessory larval retractor muscle, the velar or prototroch muscles and the pedal retractors that all together degenerate during metamorphosis, and the adult muscle complex forms de novo. CONCLUSIONS: Aeolidiella stephanieae comprises features of the larval and postmetamorphic nervous as well as muscular system that represent the ground plan of the Mollusca or even the Trochozoa (e. g. presence of the prototrochal or velar muscle ring). On the one hand, A. stephanieae shows some features shared by all nudibranchs like the postmetamorphic condensation of the CNS, the possession of rhinophoral ganglia and the lack of oral tentacle ganglia as well as the de novo formation of the adult muscle complex. On the other hand, the structure and arrangement of the serotonergic apical organ is similar to other caenogastropod and opisthobranch gastropods supporting their sister group relationship.

  1. Familia Ellobiidae (Gastropoda: Archaeopulmonata) en el litoral peruano

    Scientific Electronic Library Online (English)

    Carlos, Paredes; Aldo, Indacochea; Franz, Cardoso; Kelly, Ortega.

    2005-01-01

    Full Text Available Se reportan 8 especies de Ellobiidae para la Costa Peruana, pertenecientes a las subfamilias Ellobiinae: Ellobium stagnale (Orbigny, 1835) y Sarnia frumentum Petit, 1842; Melampodinae: Melampus carolianus (Lesson, 1842), Melampus olivaceus Carpenter, 1857 y Detracia graminea Morrison, 1846; y Pedipe [...] dinae: Marinula acuta (Orbigny, 1835), Marinula concinna (C.B Adams, 1852) y Marinula pepita King, 1831. Seis especies viven asociadas al bosque de manglar en el departamento de Tumbes, y dos en las playas de canto rodado en los límites de la Provincia Peruana. Cuatro especies tropicales se registran por primera vez para el mar peruano: E. stagnale, M. olivaceus, D. graminea y M. acuta. Abstract in english We report 8 species of Ellobiidae from the Peruvian coast, which belong to the subfamilies Ellobiinae: Ellobium stagnale (Orbigny, 1835) and Sarnia frumentum Petit, 1842; Melampodinae: Melampus carolianus (Lesson, 1842), Melampus olivaceus Carpenter, 18574 and Detracia graminea Morrison, 1846; and P [...] edipedinae: Marinula acuta (Orbigny, 1835), Marinula concinna (C.B Adams, 1852) and Marinula pepita King, 1831. Six species live associated to the mangrove of the department of Tumbes, and two in boulder beaches in the limits of the Peruvian Province. Four tropical species are registered for the first time in the Peruvian Sea: A. stagnale, M. olivaceus, D. graminea and M. acuta.

  2. Molecular phylogeny and evolution of the cone snails (Gastropoda, Conoidea).

    Science.gov (United States)

    Puillandre, N; Bouchet, P; Duda, T F; Kauferstein, S; Kohn, A J; Olivera, B M; Watkins, M; Meyer, C

    2014-09-01

    We present a large-scale molecular phylogeny that includes 320 of the 761 recognized valid species of the cone snails (Conus), one of the most diverse groups of marine molluscs, based on three mitochondrial genes (COI, 16S rDNA and 12S rDNA). This is the first phylogeny of the taxon to employ concatenated sequences of several genes, and it includes more than twice as many species as the last published molecular phylogeny of the entire group nearly a decade ago. Most of the numerous molecular phylogenies published during the last 15years are limited to rather small fractions of its species diversity. Bayesian and maximum likelihood analyses are mostly congruent and confirm the presence of three previously reported highly divergent lineages among cone snails, and one identified here using molecular data. About 85% of the species cluster in the single Large Major Clade; the others are divided between the Small Major Clade (?12%), the Conus californicus lineage (one species), and a newly defined clade (?3%). We also define several subclades within the Large and Small major clades, but most of their relationships remain poorly supported. To illustrate the usefulness of molecular phylogenies in addressing specific evolutionary questions, we analyse the evolution of the diet, the biogeography and the toxins of cone snails. All cone snails whose feeding biology is known inject venom into large prey animals and swallow them whole. Predation on polychaete worms is inferred as the ancestral state, and diet shifts to molluscs and fishes occurred rarely. The ancestor of cone snails probably originated from the Indo-Pacific; rather few colonisations of other biogeographic provinces have probably occurred. A new classification of the Conidae, based on the molecular phylogeny, is published in an accompanying paper. PMID:24878223

  3. Sôbre Anostomia (Ringicella ringens (L., 1758: (Gastropoda, Pulmonata, Odontostomidae

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    J. L. de Barros Araujo

    1963-06-01

    Full Text Available The Author redescribes Anostoma (Ringicella ringens (Linnê based on one specimen from km 92 of the Belém-Brasília road and on several specimens from Aurá, Belém, State of Pará. The male copulatory organs has a very curious constitution, being spirally coiled, not as stated by FISHER (1869.

  4. Two new species of Terebra (Gastropoda, Conoidea from Colombia

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    Luiz Ricardo L. Simone

    2006-01-01

    Full Text Available Two new species of the genus Terebra are described conchologically to the Atlantic coast of Colombia. The species are Terebra colombiensis and T. sterigmoides. They are differentiable mainly because of their sculpture, protoconch and spire angle. They are part of a group of Western Atlantic terebrids informally called "T. doellojuradoi complex" and differ from the Brazilian species in having well-developed pair of folds at columella. This character approaches the species described here to the Argentinean T. doellojuradoi.Duas novas espécies do gênero Terebra são descritas conquiliologicamente para a costa atlântica da Colômbia. As espécies são Terebra colombiensis e T. sterigmoides. Elas são diferenciáveis principalmente com base na escultura, protoconcha e ângulo da espira. Elas pertencem a um grupo de terebrídeos do Atlântico oeste informalmente chamado de "complexo T. doellojuradoi" e diferem das espécies brasileiras por ter um par de pregas bem desenvolvidas na columela. Este caráter aproxima as espécies descritas neste da argentina T. doellojuradoi.

  5. Two new species of Terebra (Gastropoda, Conoidea) from Colombia

    Scientific Electronic Library Online (English)

    Luiz Ricardo L., Simone; Adriana, Gracia C..

    Full Text Available Duas novas espécies do gênero Terebra são descritas conquiliologicamente para a costa atlântica da Colômbia. As espécies são Terebra colombiensis e T. sterigmoides. Elas são diferenciáveis principalmente com base na escultura, protoconcha e ângulo da espira. Elas pertencem a um grupo de terebrídeos [...] do Atlântico oeste informalmente chamado de "complexo T. doellojuradoi" e diferem das espécies brasileiras por ter um par de pregas bem desenvolvidas na columela. Este caráter aproxima as espécies descritas neste da argentina T. doellojuradoi. Abstract in english Two new species of the genus Terebra are described conchologically to the Atlantic coast of Colombia. The species are Terebra colombiensis and T. sterigmoides. They are differentiable mainly because of their sculpture, protoconch and spire angle. They are part of a group of Western Atlantic terebrid [...] s informally called "T. doellojuradoi complex" and differ from the Brazilian species in having well-developed pair of folds at columella. This character approaches the species described here to the Argentinean T. doellojuradoi.

  6. Silurian gastropoda from southeastern and west-central Alaska

    Science.gov (United States)

    Rohr, D.M.; Blodgett, R.B.; Fryda, J.

    2008-01-01

    Additional Silurian (Ludlovian) gastropods are described from the Heceta Formation in the Alexander terrane on Prince of Wales Island, southeastern Alaska. Species include Spinicharybdis krizi n. sp., Spinicharybdis boucoti n. sp., Morania wagneri n. sp., Haplospira craigi n. sp., Australonema sp., Pachystrophia cf. gotlandica (Lindstro??m, 1884), and Medfrazyga gilmulli n. sp. An additional new Silurian species, Morania nixonforkensis n. sp., is described from the Nixon Fork subterrane of the Farewell terrane of west-central Alaska. The spine-bearing Spinicharybdis is placed into a new subfamily Spinicharybdiinae together with Hystricoceras Jahn, 1894. Joint occurrences of genera Beraunia, Coelocaulus, and Morania, as well as members of subfamily Spinicharybdiinae in the gastropod fauna from the Heceta Formation, support its close relationship with gastropod fauna of Bohemia. Additionally, the occurrence of the genus Medfrazyga suggests a faunal link between the Alexander and Farewell terranes of Alaska. Medfrazyga gilmulli n. sp. is the oldest known and the only early Paleozoic member of the family Palaeozygopleuridae. Copyright ?? 2008, The Paleontological Society.

  7. Recharacterization of Synapterpes (S.) hanleyi (Pfeiffer) (Mollusca, Gastropoda, Stylommatophora, Subulinidae)

    Scientific Electronic Library Online (English)

    Norma Campos, Salgado; Arnaldo C. dos Santos, Coelho.

    Full Text Available Synapterpes (S.) hanleyi (Pfeiffer, 1846) is characterized by anatomy, synonymy and geographical distribution. Shell and soft parts were studied and important taxonomic characters evaluated and illustrated. These studies give conditions to characterize the species and include it in the genus Synapte [...] rpes Pilsbry, 1896 and distinguish S. hanleyi from the other species of Synapterpes s.s. known only by their shells, respectively from Brazil and Colombia: S.(S.) coronatus (Pfeiffer, 1846) and S.(S.) wallisi (Mousson, 1869).

  8. Imposex in endemic volutid from Northeast Brazil (Mollusca: Gastropoda)

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    Ítalo Braga de, Castro; Carlos Augusto Oliveira de, Meirelles; Helena, Matthews-Cascon; Cristina de Almeida, Rocha-Barreira; Pablo, Penchaszadeh; Gregório, Bigatti.

    1065-10-01

    Full Text Available O imposex caracteriza-se pelo surgimento de estruturas sexuais masculinas, em fêmeas de gastrópodes. Cerca de 120 espécies de moluscos que exibem o fenômeno quando expostas a contaminação por compostos orgânicos de estanho tais como o Tributilestanho (TBT) e o Trifenilestanho (TPT). Esses compostos [...] são utilizados, sobretudo em embarcações, no intuito de evitar a bioincrustração que danifica as embarcações e eleva os custos das viagens marítimas. No Brasil se conhecem 5 espécies de moluscos gastrópodes que manifestam imposex, são elas: Stramonita haemastoma, Stramonita rustica, Leucozonia nassa, Cymathium parthenopeum e Olivancillaria vesica. No Nordeste, monitoramentos da contaminação por organoestânicos foram realizados utilizando o imposex em gastrópodes como biomarcador. O presente estudo tem por objetivo notificar a primeira ocorrência de imposex na espécie endêmica do Nordeste brasileiro, Voluta ebraea. De um total de 11 animais observados, duas fêmeas apresentaram imposex, provenientes da Praia do Pacheco no litoral do Ceará. Observou-se nesses indivíduos a presença de glândula de cápsulas, ovidutos e receptáculo seminal concomitantemente ao pênis o que caracteriza o imposex. Como o imposex só se manifesta em moluscos expostos a compostos organoestânicos tipicamente encontrados em portos, marinas, estaleiros e locais com grande fluxo de embarcações atribui-se a origem dessa contaminação provavelmente a um estaleiro localizado nas proximidades da área de coleta. Abstract in english Imposex is characterized by the development of masculine sexual organs in neogastropod females. Almost 120 mollusk species are known to present imposex when exposed to organic tin compounds as tributyltin (TBT) and triphenyltin (TPT). These compounds are used as biocide agents in antifouling paints [...] to prevent the incrustations on boats. Five gastropod species are known to present imposex in Brazil: Stramonita haemastoma, Stramonita rustica, Leucozonia nassa, Cymathium parthenopeum and Olivancillaria vesica. This paper reports the first record of imposex observed in the endemic gastropod Voluta ebraea from Pacheco Beach, Northeast Brazil. Animals presenting imposex had regular female reproductive organs (capsule gland, oviduct and sperm-ingesting gland) and an abnormal penis. As imposex occurs in mollusks exposed to organotin compounds typically found at harbors, marinas, shipyards and areas with high shipping activities, probably contamination of Pacheco Beach is a consequence of a shipyard activity located in the nearest areas.

  9. Phylogenetic analysis of Biomphalaria tenagophila (Orbigny, 1835 (Mollusca: Gastropoda

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    Liana K Jannotti-Passos

    2010-07-01

    Full Text Available Mitochondrial DNA of Biomphalaria tenagophila, a mollusc intermediate host of Schistosoma mansoni in Brazil, was sequenced and characterised. The genome size found for B. tenagophila was 13,722 bp and contained 13 messenger RNAs, 22 transfer RNAs (tRNA and two ribosomal RNAs (rRNA. In addition to sequencing, the mitochondrial DNA (mtDNA genome organization of B. tenagophila was analysed based on its content and localization of both coding and non-coding regions, regions of gene overlap and tRNA nucleotide sequences. Sequences of protein, rRNA 12S and rRNA 16S nucleotides as well as gene organization were compared between B. tenagophila and Biomphalaria glabrata, as the latter is the most important S. mansoni intermediate host in Brazil. Differences between such species were observed regarding rRNA composition. The complete sequence of the B. tenagophila mitochondrial genome was deposited in GenBank (accession EF433576. Furthermore, phylogenetic relationships were estimated among 28 mollusc species, which had their complete mitochondrial genome deposited in GenBank, using the neighbour-joining method, maximum parsimony and maximum likelihood bootstrap. B. tenagophila was positioned at a branch close to B. glabrata and Pulmonata molluscs, collectively comprising a paraphyletic group, contrary to Opistobranchia, which was positioned at a single branch and constituted a monophyletic group.

  10. Embryonic Developmental Ecology of Freshwater Snail Lymnaea acuminata (Lymnaeidae: Gastropoda

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    Md. Moniruzzaman Sarker

    2007-01-01

    Full Text Available The egg type of Lymnaea acuminata was determined as iso-lecithal and the cleavage is spirally holoblastic type. The development of L. acuminata was observed in details. Uncleaved zygote just after laying was found to contain a relatively yolk-free zone, the animal pole and the yolk-rich region, the vegetal pole. No polar bodies were present in eggs examined immediately after they had been laid. The first polar lobe and polar body were extruded out from the zygote within 15-25 min. These were reabsorbed after 12-15 min. The formation of the second polar lobe was followed within the next 48 min. The first cleavage division occurred about 115-130 min after the formation and re-absorption of the second polar lobe, retaining for 7-10 min. The 2-celled embryos underwent the second equal division of cleavage the within next hour and the embryos reached the 4-cell stage. At the end of the 5th h, the 4-celled embryos underwent the third cleavage and the cleavage was horizontal (i.e., equatorial. At the end of the 9th h, the embryos at the 8-celled stage reached the 16-celled stage by the 4th cleavage. The 4th spirally cleaved embryos usually underwent fifth and sixth cleavages within 24-26 and 27-29 h of incubation, respectively. After 2-3 days of incubation, the developing embryos attained the trochophore stage. At the beginning of the 4th day of incubation, embryos became slightly elongated, curved foot muscle and shell gland were developed through the extension of velum and the embryos turned into the early veliger. At the beginning of the seventh day, the miniature snail possessed all the structures found in a newly hatched individual. Interaction between water physico-chemical parameters and some breeding parameters have been observed.

  11. Hemócitos de Bradybaena similaris e Megalobulimus abbreviatus (Gastropoda, Stylommatophora) / Hemocytes of Bradybaena similaris and Megalobulimus abbreviatus (Gastropoda, Stylommatophora)

    Scientific Electronic Library Online (English)

    Roberta A., Rohr; Suzana B., Amato.

    2014-06-01

    Full Text Available Os hemócitos atuam no sistema de defesa contra organismos invasores e partículas estranhas, auxiliando o reconhecimento do que é próprio do corpo dos grastrópodes e o que não é. São escassas as informações e estudos sobre os hemócitos em espécies de moluscos saudáveis (sem infecções), principalmente [...] em Bradybaena similaris (Fèrussac, 1821) and Megalobulimus abbreviatus (Bequaert, 1948). Portanto, este trabalho tem como objetivos a caracterização e quantificação dos hemócitos presentes na hemolinfa destas duas espécies. Neste trabalho, foram identificados três tipos celulares na hemolinfa de ambas espécies: as células redondas, hialinócitos e granulócitos. Os três tipos de hemócitos foram medidos e foi calculada a média do diâmetro total e do núcleo para cada um deles. Para B. similaris, o diâmetro médio das células redondas foi de 10,7 µm, dos hialinócitos foi de 20 µm e dos granulócitos de 25,4 µm. Para M. abbreviatus, o diâmetro médio foi de 11,7 µm para as células redondas, de 21,5 µm para os hialinócitos e de 30,5 µm para os granulócitos. Embora os hialinócitos possuam médias parecidas entre B. similaris e M. abbreviatus, foram detectadas diferenças significativas do diâmetro celular total e diâmetro do núcleo (p Abstract in english Hemocytes act in the defense system against invading organisms, foreign particles aiding the recognition of what is own to the body of gastropods and what is not. Information and studies on the hemocytes in species of mollusks healthy (no infections), especially in Bradybaena similaris (Fèrussac, 18 [...] 21) and Megalobulimus abbreviatus (Bequaert, 1948) are scarce. Therefore, this work aims at characterization and quantification of hemocytes present in the hemolymph of these two species. In this work three cell types were identified in the hemolymph of both species: round cells, hyalinocytes and granulocytes. The three types of hemocytes were measured, and the average of total diameter and the nucleus for each was calculated. On B. similaris, the average diameter of round cells was 10.7 µm, of hyalinocytes was 20 µm and of granulocytes was 25.4 µm. On M. abbreviatus, the average diameter of round cells was 11.7 µm, of hyalinocytes was 21.5 µm and of granulocytes was 30.5 µm. Although the hyalinocytes have similar averages between B. similaris and M. abbreviatus, the cells were demonstrated significant differences in their total diameter and size of the nucleus (p

  12. New species of Cyclodontina from Bahia, Brazil (Gastropoda, Pulmonata, Odontostomidae) / Nova espécie de Cyclodontina da Bahia, Brazil (Gastropoda, Pulmonata, Odontostomidae)

    Scientific Electronic Library Online (English)

    Rodrigo B., Salvador; Luiz R. L., Simone.

    2014-12-01

    Full Text Available Uma nova espécie de gastrópode pulmonado foi coletada recentemente em um pequeno fragmento de mata em Bom Jesus da Lapa, Bahia, Brasil. O estado da Bahia é conhecido por sua alta diversidade de moluscos terrestres e Bom Jesus da Lapa é uma localidade particularmente interessante, pois localiza-se na [...] interface entre os biomas Cerrado e Caatinga. A nova espécie é descrita como Cyclodontina tapuia sp. nov. e pode ser facilmente identificada por sua concha de cor marrom, espira cônica, voltas convexas, escultura composta por fortes costelas e uma abertura com quatro barreiras: um dente parietal, um dente palatal, um dente basal e uma forte lamela columelar. A presente descoberta atua como um lembrete de quão pouco é conhecida a malacofauna continental brasileira e também da urgência em estudar e preservar a rica (mas comumente negligenciada) fauna da Caatinga. Abstract in english A new species of pulmonate snail was recently collected in a small forest fragment in the city of Bom Jesus da Lapa, Bahia state, Brazil. Bahia is known for a high diversity of land snails and Bom Jesus da Lapa is an interesting locality, since it is close to the interface between two major Brazilia [...] n biomes: Cerrado and Caatinga. The new species is described as Cyclodontina tapuia sp. nov. and can be easily identified by its brown shell, conical spire, convex whorls, a sculpture comprised of strong ribs, and an aperture with four barriers: a median parietal tooth, a median palatal tooth, a median basal tooth and a strong columellar lamella. This discovery is also a reminder of how little the Brazilian continental molluscan fauna is known and of the urgency in studying and preserving the rich (though usually overlooked) fauna of the Caatinga.

  13. Ancylidae (Gastropoda, Basommatophora) na América do Sul: sistemática e distribuição / South American Ancylidae (Gastropoda, Basommatophora): systematic and distribution

    Scientific Electronic Library Online (English)

    Rosane, Lanzer.

    Full Text Available [...] Abstract in english The family Ancylidae is represented in South America by the genera: Gundlachia Pfeiffer, 1849, Ferrissia Walker, 1903, Burnupia Walker, 1912 and Laevapex Walker, 1903. The species are caracterized using the combination of shell features and radula by scanning electron microscope, shell muscle and ma [...] ntle pigmentation. The conchometry is also presented, but it does not help to species identification. The distribution of G. crequi (Bavay, 1904), G. foncki (Philippi, 1866), G. philippiana (Biese, 1948), G. obliqua (Broderip & Sowerby, 1832), G. moricandi (Orbigny, 1837), G. concentrica (Orbigny, 1835), G. radiata (Guilding, 1828), G bakeri Pilsbry, 1913, G ticaga (Marcus & Marcus, 1962), F. gentilis Lanzer, 1991, B. ingae Lanzer, 1991, L. vazi Santos, 1989 and Laevapex sp. in the Neotropical region is based on the bibliography, examination of the material deposited in scientific institutions and in the author's collection.

  14. Fatal bacteremia due to immotile Vibrio cholerae serogroup O21 in Vientiane, Laos – a case report

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    Moore Catrin E

    2008-04-01

    Full Text Available Abstract Background Human infections with non-O1, non-O139 V. cholerae have been described from Laos. Elsewhere, non cholera-toxin producing, non-O1, non-O139 V. cholerae have been described from blood cultures and ascitic fluid, although they are exceedingly rare isolates. Case presentation We describe a farmer who died with Vibrio cholerae O21 bacteremia and peritonitis in Vientiane, Laos, after eating partially cooked apple snails (Pomacea canaliculata and mussels (Ligumia species. The cultured V. cholerae were non-motile. PCR detected ompW and toxR gene regions but not the ctxA, ompU, omp K and TCP gene regions. Although the organisms lacked flagellae on scanning electron microscopy, they possessed the Vibrio flagellin flaA gene. Conclusion Severe bacteremic non-O1, non-O139 V. cholerae is reported from Laos. The organisms were unusual in being non-motile. They possessed the Vibrio flagellin flaA gene. Further research to determine the reasons for the non-motility and virulence is required.

  15. Performance of broilers fed with snail (Pomacea caniculata meal as substitute to fish meal or meat and bone meal

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    Ulep, LJL.

    1991-01-01

    Full Text Available Snail meal was used as a substitution to fish meat and bone meal in broiler rations. Final weightand feed conversion efficiency of the birds, profit and return on investment differed significantly among treatments. Feed consumption and production costs were comparable. Results show that snail meal can replace fish or meat and bone meal in broiler diets.

  16. Copper desorption in flooded agricultural soils and toxicity to the Florida apple snail (Pomacea paludosa): Implications in Everglades restoration

    International Nuclear Information System (INIS)

    Copper (Cu) desorption and toxicity to the Florida apple snail were investigated from soils obtained from agricultural sites acquired under the Comprehensive Everglades Restoration Plan. Copper concentrations in 11 flooded soils ranged from 5 to 234 mg/kg on day 0 and from 6.2 to 204 mg/kg on day 28 (steady-state). The steady-state Cu concentration in overlying water ranged from 9.1 to 308.2 ?g/L. In a 28-d growth study, high mortality in snails occurred within 9 to 16 d in two of three soil treatments tested. Growth of apple snails over 28 d was affected by Cu in these two treatments. Tissue Cu concentrations by day 14 were 12-23-fold higher in snails exposed to the three soil treatments compared to controls. The endangered Florida snail kite and its main food source, the Florida apple snail, may be at risk from Cu exposure in these managed agricultural soil-water ecosystems. - Copper desorbs from agricultural soils and is toxic to the Florida apple snail

  17. A malacofauna bentônica das represas do médio rio Tietê (São Paulo, Brasil e uma avaliação ecológica das espécies exóticas invasoras, Melanoides tuberculata (Müller e Corbicula fluminea (Müller Benthic malacofauna of the reservoirs of the Middle River Tietê (São Paulo, Brazil and an ecological evaluation of the invading exotic species, Melanoides tuberculata (Müller and Corbicula fluminea (Müller

    Directory of Open Access Journals (Sweden)

    Ana L. Suriani

    2007-03-01

    Full Text Available Este trabalho analisa a composição de espécies, a densidade e a distribuição espacial e temporal da malacofauna bentônica em três represas do médio rio Tietê. As coletas foram realizadas em dois períodos climáticos, o chuvoso em novembro de 2002 e o seco em agosto de 2003, amostrando-se três porções em cada represa (superior, mediana e barragem e seguindo uma varredura com seis pontos amostrais em cada transecto. Os dados limnológicos obtidos evidenciaram que as represas do médio rio Tietê encontram-se eutrofizadas com elevadas concentrações de nutrientes (totais e dissolvidos. Foram registradas oito espécies de moluscos sendo seis nativas e duas exóticas. Destas, a espécie dominante foi o molusco exótico e invasor Melanoides tuberculata (Müller, 1774, presente em todas as represas. A outra espécie exótica Corbicula fluminea (Müller, 1774, também esteve presente em todas as represas e em ambos os períodos de coleta (exceto na represa de Barra Bonita. Na represa de Barra Bonita só ocorreram as duas espécies exóticas, enquanto nas represas de Bariri e Ibitinga as espécies nativas Aylacostoma tenuilabris (Bernardi, 1856, Biomphalaria glabrata (Say, 1818, Biomphalaria intermedia (Paraense & Deslandes, 1962, Diplodon expansus (Küster, 1853, Physa cubensis (Pfeiffer, 1839 e Pomacea canaliculata (Lamarck, 1822 ocorreram em pelo menos um dos períodos amostrados. A ocupação generalizada de M. tuberculata e C. fluminea e as elevadas densidades destas espécies nas represas estudadas revelam o alto potencial invasor das mesmas e a provável competição com as espécies nativas.This study analyze the composition of species, the density and the spatial and temporal distribution of benthic malacofauna in three reservoirs of the Middle Tietê River. The samplings were carried out in two climatic periods, the rainy season in November 2002 and the dry season in August 2003, showing three portions in each reservoir (upper, middle and lower and following a sweeping with six sampling points in each transect. Based on the limnological data the reservoirs of the Middle Tietê River were eutrophied with high concentrations of nutrients (total and dissolved. Eight species of mollusks were registered, six natives and two exotics. Of these, the dominant species was the exotic and invading mollusk Melanoides tuberculata (Müller, 1774, found in all reservoirs. Another exotic specie Corbicula fluminea (Müller, 1774, was current in all the reservoirs in both periods of sampling (except in the Barra Bonita reservoir. In the Barra Bonita reservoir only the two exotic species occurred, while in the Bariri and Ibitinga the native species Aylacostoma tenuilabris (Bernardi, 1856, Biomphalaria glabrata (Say, 1818, Biomphalaria intermedia (Paraense & Deslandes, 1962, Diplodon expansus (Küster, 1853, Physa cubensis (Pfeiffer, 1839 and Pomacea canaliculata (Lamarck, 1822 occurred in at least one of the sampled periods. The generalized occupation of M. tuberculata and C. fluminea and the high densities of these species in the studied reservoirs reveal the invading potential of same and the probable competition with the native species.

  18. A malacofauna bentônica das represas do médio rio Tietê (São Paulo, Brasil) e uma avaliação ecológica das espécies exóticas invasoras, Melanoides tuberculata (Müller) e Corbicula fluminea (Müller) / Benthic malacofauna of the reservoirs of the Middle River Tietê (São Paulo, Brazil) and an ecological evaluation of the invading exotic species, Melanoides tuberculata (Müller) and Corbicula fluminea (Müller)

    Scientific Electronic Library Online (English)

    Ana L., Suriani; Roberta S., França; Odete, Rocha.

    2007-03-01

    Full Text Available Este trabalho analisa a composição de espécies, a densidade e a distribuição espacial e temporal da malacofauna bentônica em três represas do médio rio Tietê. As coletas foram realizadas em dois períodos climáticos, o chuvoso em novembro de 2002 e o seco em agosto de 2003, amostrando-se três porções [...] em cada represa (superior, mediana e barragem) e seguindo uma varredura com seis pontos amostrais em cada transecto. Os dados limnológicos obtidos evidenciaram que as represas do médio rio Tietê encontram-se eutrofizadas com elevadas concentrações de nutrientes (totais e dissolvidos). Foram registradas oito espécies de moluscos sendo seis nativas e duas exóticas. Destas, a espécie dominante foi o molusco exótico e invasor Melanoides tuberculata (Müller, 1774), presente em todas as represas. A outra espécie exótica Corbicula fluminea (Müller, 1774), também esteve presente em todas as represas e em ambos os períodos de coleta (exceto na represa de Barra Bonita). Na represa de Barra Bonita só ocorreram as duas espécies exóticas, enquanto nas represas de Bariri e Ibitinga as espécies nativas Aylacostoma tenuilabris (Bernardi, 1856), Biomphalaria glabrata (Say, 1818), Biomphalaria intermedia (Paraense & Deslandes, 1962), Diplodon expansus (Küster, 1853), Physa cubensis (Pfeiffer, 1839) e Pomacea canaliculata (Lamarck, 1822) ocorreram em pelo menos um dos períodos amostrados. A ocupação generalizada de M. tuberculata e C. fluminea e as elevadas densidades destas espécies nas represas estudadas revelam o alto potencial invasor das mesmas e a provável competição com as espécies nativas. Abstract in english This study analyze the composition of species, the density and the spatial and temporal distribution of benthic malacofauna in three reservoirs of the Middle Tietê River. The samplings were carried out in two climatic periods, the rainy season in November 2002 and the dry season in August 2003, show [...] ing three portions in each reservoir (upper, middle and lower) and following a sweeping with six sampling points in each transect. Based on the limnological data the reservoirs of the Middle Tietê River were eutrophied with high concentrations of nutrients (total and dissolved). Eight species of mollusks were registered, six natives and two exotics. Of these, the dominant species was the exotic and invading mollusk Melanoides tuberculata (Müller, 1774), found in all reservoirs. Another exotic specie Corbicula fluminea (Müller, 1774), was current in all the reservoirs in both periods of sampling (except in the Barra Bonita reservoir). In the Barra Bonita reservoir only the two exotic species occurred, while in the Bariri and Ibitinga the native species Aylacostoma tenuilabris (Bernardi, 1856), Biomphalaria glabrata (Say, 1818), Biomphalaria intermedia (Paraense & Deslandes, 1962), Diplodon expansus (Küster, 1853), Physa cubensis (Pfeiffer, 1839) and Pomacea canaliculata (Lamarck, 1822) occurred in at least one of the sampled periods. The generalized occupation of M. tuberculata and C. fluminea and the high densities of these species in the studied reservoirs reveal the invading potential of same and the probable competition with the native species.

  19. Conquiliomorfologia de Tamayoa (Tamayops) banghaasi (Thiele) (Gastropoda, Systrophiidae) / Conchomorphological aspects of Tamayoa (Tamayops) banghaasi (Thiele) (Gastropoda, Systrophiidae) as a contribution to Systrophiidae systematic

    Scientific Electronic Library Online (English)

    Daniele Pedrosa, Monteiro; Sônia Barbosa dos, Santos.

    2001-12-01

    Full Text Available [...] Abstract in english Thirty shells of Tamayoa (Tamayops) banghaasi (Thiele, 1927) from Ilha Grande, Rio de Janeiro, were analyzed with a stereomicroscop showing the following characteristics: discoid shell, without macrosculptures; ovate-lunate aperture without teeth. Thin, sharp and not-reflected lip; umbilicus with 1/ [...] 5 of the shell's diameter; impressed suture, total whorls from 4 to 5.5; protoconch with 1.5 to 2 whorls; yellowish-amber, translucent and glossy periostracum. The morphology of the shells were discussed, as well as the shell's dimensions. The conchomorphological patterns are important for systematic studies of mollusks and this work presents data that can be used in future studies about the family.

  20. Oligocene pteropods (Gastropoda: Thecosomata) from the Kishima Formation, Saga Prefecture, southwest Japan / Pterópodos (Gastropoda: Thecosomata) del Oligoceno de la Formación Kishima, Prefectura Saga, suroeste de Japón

    Scientific Electronic Library Online (English)

    Yusuke, Ando.

    2011-08-01

    Full Text Available Se describen cinco especies de dos géneros de pterópodos, Limacina conica (Koenen, 1892), L. hospes Rolle, 1861, L. karasawai nueva especie, Limacina sp. y Creseis kishimaensis nueva especie, correspondientes a la Formación Kishima del Oligoceno en la Prefectura de Saga, al noroeste de Kyushu, suroe [...] ste de Japón. Estas especies representan el primer registro de pterópodos del Oligoceno de Japón. La fauna de pterópodos de la Formación Kishima se caracteriza por la presencia predominante del género Limacina. La fauna de pterópodos del Oligoceno de Japón es discutida brevemente. Abstract in english Five species in two genera of pteropods, Limacina conica (Koenen, 1892), L. hospes Rolle, 1861, L. karasawai new species, Limacina sp. and Creseis kishimaensis new species, are described from the Oligocene Kishima Formation of Saga Prefecture, northwestern Kyushu, southwest Japan. These species cons [...] titute the first Oligocene pteropod record from Japan. The pteropod fauna of the Kishima Formation is characterized by the predominate occurrence of the genus Limacina. The Oligocene pteropod fauna from Japan is briefly discussed.

  1. Microescultura da concha de Rectartemon (Rectartemon depressus (Heynemann (Gastropoda, Stylomatophora, Streptaxidae The microsculpture of the shell of Rectaktbmon (Rectíartemon depressus (Heynemann (Gastropoda, Stylomatophora, Streptaxidae

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    Mônica Picoral

    1998-01-01

    Full Text Available The microsculpture of Rectartemon depressus (Heynemann, 1868 shell is described on scanning electron microscope. The generics characteristics are proposed: shell's dorsal sculture formed for ribs striae radial; nuclear whorls smooth; ventral surface of the shell smooth or slightly striate; and as specifics characteristics: the number of ribs striae radial on the last world. The R. (R. depressus presented seven or eight ribs striae radial for millimeter.

  2. The annual reproductive cycle of the snail Megalobulimus abbreviatus (Bequaert, 1948 (Gastropoda, Pulmonata Ciclo reprodutivo anual do caracol Megalobulimus abbreviatus (Bequaert, 1948 (Gastropoda, Pulmonata

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    A. C. M. Horn

    2005-08-01

    Full Text Available Morphological changes in the sexual organs of the pulmonates were observed throughout a year and correlated with reproductive-cycle periods. Reproductive-organ weights of the snail Megalobulimus abbreviatus were recorded seasonally and gonad sections were analyzed morphologically. The weights were used to obtain the organosomatic index. Mean oocytic diameter and oocytic maturation index were based on gonad sections. It was concluded that M. abbreviatus is an iteroparous snail whose annual reproductive cycle is characterized by mating and egg laying throughout spring and early summer, and also by reproductive system preparation, occurring over the remainder of the summer until the end of winter, for a new breeding season.Variações morfológicas nos órgãos do sistema reprodutor dos gastrópodes pulmonados são observadas ao longo do ano e podem ser correlacionadas a fases de seu ciclo reprodutivo. A partir dessa observação, a massa dos órgãos do sistema reprodutor do caracol Megalobulimus abbreviatus foi tomada em cada estação do ano e foram obtidas secções histológicas das gônadas. Os valores de massa foram utilizados para a obtenção do índice organo-somático e as secções, para calcular o diâmetro médio dos ovócitos e o índice de maturação ovocitária. Concluímos que M. abbreviatus é um caracol "iteroparous", apresentando ciclo reprodutivo anual caracterizado por acasalamento e oviposição durante a primavera e o início do verão e pela preparação do sistema reprodutor para um nova fase reprodutiva, que se inicia em janeiro e se estende até o final do inverno.

  3. La Familia Trochidae (Mollusca: Gastropoda) en el norte de Chile: consideraciones ecológicas y taxonómicas / The trochidae family (Mollusca : Gastropoda) in northern Chile: taxonomic and ecological considerations

    Scientific Electronic Library Online (English)

    DAVID, VELIZ; JULIO A, VASQUEZ.

    2000-12-01

    Full Text Available Este estudio describe la diversidad, y la distribución latitudinal y batimétrica de los caracoles de la Familia Trochidae en el norte de Chile, mediante muestreos intermareales y submareales someros, realizados entre 1996 y 1999 entre Arica (18º S) y Los Vilos (31º S), y de muestras de profundidad p [...] rovenientes de la pesca de arrastre del camarón nylon, Heterocarpus reedi. En el norte de Chile, la Familia Trochidae está representada por cuatro géneros: Tegula y Diloma de distribución intermareal y submareal somero hasta los 20 m de profundidad, y Bathybembix y Calliostoma presentes en profundidades superiores a los 200 m. El género Tegula tiene seis especies (T. quadricostata, T. luctuosa, T. ignota, T. atra, T. tridentata y T. euryomphala) distribuídas en sustratos rocosos intermareales y submarales someros. El género Diloma está representado por una especie, D. nigerrima, de distribución intermareal hasta pocos metros de profundidad. El género Calliostoma tiene dos especies C. chilena y C. delli, las que se distribuyen entre 200 y 750 m de profundidad. Finalmente, el género Bathybembix está representado por B. humboldti y B. macdonaldi distribuídas entre 200 y 1480 m de profundidad. Esta segregación batimétrica parece estar relacionada a las estrategias alimentarias de cada uno de los géneros de la familia Trochidae. Diloma y Tegula son herbívoros, las especies del género Bathybembix son alimentadoras de depósito y las de Calliostoma son carnívoras Abstract in english This study reveals the diversity, and the bathimetric and latitudinal distribution of the snails of the Trochidae family members in northern Chile, throughout the analysis of all Trochidae gastropods entailed in intertidal and subtidal (from the `camarón naylon' fishery) samples collected during 199 [...] 6 and 1999 between Arica (ca 18º S) and Los Vilos (ca 31º S). The Trochidae family in northern Chile have four genus: Tegula and Diloma that are distributed on intertidal and shallow subtidal habitats, and Calliostoma and Bathybembix which occurr at dephts greather than 200 m. Tegula have 6 species: T. quadricostata, T. luctuosa, T. ignota, T. atra, T. tridentata, and T. euryomphala are distributed on intertidal and shallow subtidal habitats. Diloma is a monospecific genus, whereas D. nigerrima is an intertidal species. The genus Calliostoma have two species C. chilena and C. delli occurring between 200 and 750 m depth and the Bathybembix with two species, B. Humboldti and B. macdonaldi, distributed between 200 and 1480 m depth. The bathimetric distribution of Trochidae shows a strong correlation with food strategy: Diloma and Tegula are herbivores, while Bathybembix species are deposit feeders and Calliostoma are carnivores

  4. Thecosomata e Gymnosomata (Mollusca, Gastropoda) da cadeia Fernando de Noronha, Brasil / Thecosomata and Gymnosomata (Mollusca, Gastropoda) from Fernando de Noronha chain, Brazil

    Scientific Electronic Library Online (English)

    Maria Eduarda de, Larrazábal; Valdeni Soares de, Oliveira.

    2003-06-01

    Full Text Available [...] Abstract in english The Mollusca Pteropoda from Fernando de Noronha Chain Northeastern Brazil were studied in order to know their taxonomy and distribution. Collections were carried out during the I Oceanographical Expedition of the REVIZEE Program (Live Resources of the Economical Exclusive Zone) from August to Septem [...] ber 1995. The studied area is located between 03°04'S-04°23'S and 32°19'W-36°26'W, comprising 35 stations. Sampling was performed through oblique hauls from 50m depth to surface and from 100 m depth to surface, with a Bongo net (300 and 500 µm mesh size, net diameter: 60 cm), that was equipped with a flow meter. Samples in a total of 99 were preserved, immediately, in buffered 4% formaldehyde. Qualitative and quantitative analyses of the samples were performed based on total sample. The samples were analysed on a counting plate "Bogorov" type under a stereo microscope. A total of 8,258 organisms were identified belonging to: 8 families, 16 genera and 27 species. Limacina inflata (d´Orbigny, 1836) and Creseis virgula (Rang, 1828) were frequent and very frequent in the area outranking among the studied Pteropoda. The total density varied from 2.5 to 3,012.05 org.m-³. Highest richness was registered at the Continental Shelf and Slope with 1two species. The Pteropoda association showed higher differences between day and night collections. Limacina inflata caused this difference due to its higher density at night collections and it was independent of the depth, mesh size and temperature. Creseis virgula had its occurrence, mainly, during day time.

  5. Histologia das glândulas salivares dos Limacoidea e Milacidae (Gastropoda, Pulmonata Histology of the salivary glands of the Limacoidea and Milacidae (Gastropoda, Pulmonata

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    Ana Maria Leal-Zanchet

    2003-09-01

    Full Text Available The histology of the salivary glands of six species of Limacoidea, Boettgerilla pallens Simroth, 1912, Deroceras laeve (Müller, 1774, Deroceras reticulatum (Müller, 1774, Deroceras rodnae Grossu & Lupu, 1965, Malacolimax tenellus (Müller, 1774 and Lehmannia marginata (Müller, 1774, and a species of Milacidae, Tandonia budapestensis (Hazay, 1881 is comparatively described herein. In the glandular parenchyme four to five secretory cell types are distinguished and characterised, besides a cell type which is probably undifferentiated. The secretory cell types are classified into two groups, mucous and serous cells. Two types of mucous cells and two to three types of serous cells are distinguished. The salivary glands of the herein studied Limacoidea and Milacidae show a duct system composed of intralobular, interlobular and main ducts, each one presenting a characteristic type of epithelial lining. The results are comparatively discussed with the data available in the literature, in order to verify the correspondence between the different cell types described for other Pulmonata.

  6. Histologia das glândulas salivares dos Limacoidea e Milacidae (Gastropoda, Pulmonata) Histology of the salivary glands of the Limacoidea and Milacidae (Gastropoda, Pulmonata)

    OpenAIRE

    Ana Maria Leal-Zanchet

    2003-01-01

    The histology of the salivary glands of six species of Limacoidea, Boettgerilla pallens Simroth, 1912, Deroceras laeve (Müller, 1774), Deroceras reticulatum (Müller, 1774), Deroceras rodnae Grossu & Lupu, 1965, Malacolimax tenellus (Müller, 1774) and Lehmannia marginata (Müller, 1774), and a species of Milacidae, Tandonia budapestensis (Hazay, 1881) is comparatively described herein. In the glandular parenchyme four to five secretory cell types are distinguished and characterised, besides a c...

  7. Evaluation of the use of Olivella minuta (Gastropoda, Olividae) and Hastula cinerea (Gastropoda, Terebridae) as TBT sentinels for sandy coastal habitats.

    Science.gov (United States)

    Petracco, Marcelo; Camargo, Rita Monteiro; Berenguel, Thayana Amorim; de Arruda, Noelle C L Patrício; Del Matto, Lygia A; Amado, Lílian Lund; Corbisier, Thais Navajas; Castro, Ítalo Braga; Turra, Alexander

    2015-07-01

    Tributyltin (TBT) contamination is still recorded in the environment even after its ban in antifouling paints. Since most biomonitors of TBT contamination, through imposex evaluation, are hard-bottom gastropods, the identification of soft-bottom sentinels has become useful for regions where rocky shores and coral reefs are absent. Thus, an evaluation of Olivella minuta and Hastula cinerea as monitors of TBT contamination was performed in two sandy beaches located under influence area of São Sebastião harbor (São Paulo state, Brazil), where previous and simultaneous studies have reported environmental contamination by TBT. In addition, the imposex occurrence in H. cinerea was assessed in an area with low marine traffic (Una beach), also located in São Paulo State. A moderate imposex incidence in O. minuta was detected in Pernambuco (% I?=?9.36, RPLI?=?4.49 and RPLIstand?=?4.27) and Barequeçaba (% I?=?2.42, RPLI?=?0.36 and RPLIstand?=?0.81) beaches, indicating TBT contamination. In contrast, more severe levels of imposex were recorded for H. cinerea in Una beach (% I?=?12.45) and mainly in Barequeçaba beach (% I?=?98.92, RPLI?=?26.65). Our results suggest that O. minuta and H. cinerea have good potential as biomonitors for TBT based on their wide geographical distribution, common occurrence in different coastal sediment habitats, easy collection, and association with TBT-contaminated sediments. PMID:26085280

  8. Nova espécie de Thaumastus da Floresta Atlântica do Paraná, Brasil (Mollusca, Gastropoda, Pulmonata, Bulimuloidea) / New species of Thaumastus from Atlantic Forest of Paraná, Brazil (Mollusca, Gastropoda, Pulmonata, Bulimuloidea)

    Scientific Electronic Library Online (English)

    Eduardo, Colley.

    2012-03-01

    Full Text Available Thaumastus straubei sp. nov. é descrita da Floresta Atlântica do Estado do Paraná, Brasil. A atribuição genérica baseou-se a partir de análise morfológica da concha, rádula, mandíbula e das partes moles, evidenciando características únicas e exclusivas que permitem a distinção das demais espécies do [...] gênero conhecidas até o momento. Abstract in english Thaumastus straubei sp. nov. is described from Atlantic Forest of state of Paraná, Brazil. The generic attribution came from morphological analysis of the shell, radula, jaw and soft parts showing unique and exclusive features that allow distinction from all others species of genus known so far. [...

  9. Prosobrânquios terrestres do Brasil: Cyclophoridae: Neocyclotus (N. agassizi (Bartsch & Morrison, 1942 (Mollusca, Gastropoda, Mesogastropoda Land prosobranchs of Brazil: Cyclophoridae: Neocyclotus (N. agassizi (Bartsch & Morrison, 1942 (Mollusca, Gastropoda, Mesogastropoda

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    Arnaldo C. dos Santos Coelho

    1989-01-01

    Full Text Available Studies on specimens from Brazil (States of Pernambuco and Alagoas were carried out in order to relate data about morphology of hard and soft parts o Nocyclotus (N. agassizi (Bartsh & Morrison, 1942.

  10. Ciclo gonádico de Tegula aureotincta (Mollusca: Gastropoda) en Bahía Asunción, Baja California Sur, México / Gonadal cycle of Tegula aureotincta (Mollusca: Gastropoda) in Bahía Asunción, Baja California Sur, Mexico

    Scientific Electronic Library Online (English)

    Nurenskaya, Vélez-Arellano; Laura E., Mendoza-Santana; Esperanza, Ortíz-Ordóñez; Sergio A., Guzmán del Proó.

    2011-08-01

    Full Text Available Se describe el ciclo gonádico de Tegula aureotincta en Bahía Asunción Baja California Sur. Se recolectaron mensualmente de 25 a 30 organismos de enero a diciembre de 2006. Estos fueron procesados con la técnica histológica de inclusión en parafina, el tejido de la gónada se cortó a 7 ?m de grosor, l [...] os cortes fueron teñidos mediante la técnica de Hematoxilina-Eosina. La proporción de sexosfue 1:1, tanto hembras como machos presentaron todo el año gametogénesis y madurez, con dos eventos principales de expulsión de gametos: uno en otoño-invierno y otro en primavera. La madurez y los momentos de expulsión de gametos guardan aparentemente estrecha relación con los cambios estacionales de la temperatura. Abstract in english The histological gonadal cycle of Tegula aureotincta was determined at Bahia Asuncion Baja California Sur. Monthly samples of 25 to 30 organisms were collected from January to December 2006. They were processed by histological technique, embedded in paraffin, sections 7- ?m thick were stained with h [...] ematoxylin-eosin.The sex ratio was 1:1. Both sexes presented gametogénesis and maturity stages the year through. Two major spawning events were identified in autumn-winter and spring. The maturity and spawning times have close relations with the seasonal change of sea water temperature.

  11. Nuevos datos de Gibberula conejoensis(Mollusca: Gastropoda: Cystiscidae) en Venezuela / New data on Gibberula connejoennsis (Mollusca: Gastropoda: Cystiscidae) in Venezuela

    Scientific Electronic Library Online (English)

    Beatriz, Álvarez; Brynelly, Bastidas; Manuel, Caballer.

    2011-04-01

    Full Text Available Se amplía el área de distribución conocida de Gibberula conejoensis a la costa continental de Venezuela, donde ha sido capturada en dos localidades distantes (350 km y casi 600 km en línea recta) de su localidad tipo. Adicionalmente, se aportan datos de la anatomía interna y de la rádula de la espec [...] ie no descritos hasta la fecha. Abstract in english The Known range of Gibberula conejoensis is expanded to the mainland of Venezuela. It was captured 350 km and nearly 600 km far from its type locality. Data on the internal anatomy and radula are provided for the first time. [...

  12. A new species of Leiostracus from Bahia, Brazil (Gastropoda, Pulmonata, Orthalicidae) / Uma nova espécie de Leiostracus da Bahia, Brasil (Gastropoda, Pulmonata, Orthalicidae)

    Scientific Electronic Library Online (English)

    Rodrigo B., Salvador; Daniel C., Cavallari.

    2014-03-01

    Full Text Available Uma nova espécie de gastrópode pulmonado foi recentemente coletada em um pequeno fragmento de Mata Atlântica nas vizinhanças de Canavieiras, Bahia, uma área de reconhecida diversidade de moluscos terrestres. Essa espécie é aqui descrita como Leiostracus fetidus sp. nov., podendo ser facilmente ident [...] ificada pelo seu padrão de coloração composto por faixas axiais irregulares, de cor marrom a preto, uma faixa axial avermelhada "separando" o peristômio branco do restante da concha e uma faixa espiral marrom, larga e irregular, contornando a região umbilical. Outras características diagnósticas incluem um tamanho relativamente pequeno, uma proto-dobra columelar e duas leves dobras na região basal da abertura. A presente descoberta é um lembrete de quão pouco essa fauna é conhecida e também um alerta para a conservação desses fragmentos de mata. Abstract in english A remarkable new species of pulmonate snail was recently collected in a small Atlantic Rainforest fragment near the city of Canavieiras, state of Bahia, Brazil, an area known for a high diversity of land snails. It is described herein as Leiostracus fetidus sp. nov. and can be easily identified by i [...] ts color pattern of irregular brown to black axial stripes on a white to yellow background, a reddish axial band "separating" the white peristome from the rest of the shell and a broad brown spiral band surrounding the umbilical region. Other diagnostic features include a relatively small size, a proto columellar fold and two very weak folds delimiting the basal region of the aperture. This discovery is a reminder of how little this fauna is known and also an alarm for proper conservation of these forest fragments.

  13. Estudio Histológico de Boca, Esófago, Estómago e Intestino de Polystira albida (Gastropoda: Turridae) / Histology Study of Mouth, Esophagus, Stomach and Intestine of Polystira albida (Gastropoda: Turridae)

    Scientific Electronic Library Online (English)

    Ana Laura, García-López; Esther A, Uria-Galicia; Esperanza, Ortiz-Ordoñez.

    2007-12-01

    Full Text Available En la presente investigación se realizó la caracterización histológica del tubo digestivo de Polystira albida (Toxoglossa:Turridae) mediante microscopía óptica, utilizando ejemplares colectados en la Sonda de Campeche. Los resultados del análisis muestran que los labios, la boca y la probóscide pres [...] entan un epitelio cilindrico simple ciliado. La cavidad bucal tiene un epitelio cilindrico estratificado. El esófago presenta un epitelio cilindrico simple con células glandulares granulares acidófilas (naturaleza proteica), y es el sitio donde comienza la digestión. El estómago se divide en tres regiones histológicas, y tiene dos tipos de epitelio, uno cilindrico simple ciliado y otro cilindrico simple; el primero está formado por abundantes células glandulares acidófilas y basófilas (naturaleza proteica y glicoproteica', respectivamente); y el segundo contiene slo células glandulares acidófilas. La glándula digestiva está constituida por adenómeros túbulo-acinosos con células glandulares acidófilas y basófilas, en diferentes grados de secreción y los conductos presentan un epitelio cilindrico ciliado con células glandulares de ambos tipos. El intestino se divide en cinco regiones histológicas, la primera presenta un tiflosol con dos tipos de epitelio, cilindrico simple y cilindrico simple con chapa estriada; y el resto del tracto tiene un epitelio cilindrico simple ciliado con células glandulares granulares acidófilas y pliegues de diferentes tamaños que aumentan o reducen la cavidad del conducto. Se concluye que existen diferencias, principalmente en la región anterior del tubo digestivo (cavidad bucal, esófago y estómago), con respecto a las descripciones generales realizadas para la subclase Prosobranchia Abstract in english In the present investigation it was realized a histological characterization of the digestive tract of Polystira albida (Toxoglossa: Turridae), by using optic microscopy of specimens collected in Sonda de Campeche. Results of analysis show that lips, mouth and proboscis present a simple columnar epi [...] thelium with cilia. Buccal cavity has a stratified columnar epithelium. Esophagus presents a simple columnar epithelium with acidophilic granular glandular cells (proteic nature), and it is the place where digestion starts. Stomach is divided in three histological regions that have two epithelial types, simple columnar with cilia and without one; the first is formed by a lot of acidophilic and basophilic glandular cells (proteic and glycoproteic nature respectively), and the second only contains acidophilic glandular cells. Digestive gland is constituted by tubule-acinous adenomers with acidophilic and basophilic glandular cells in different grades of secretion, and ducts have simple columnar epithelium with cilia and scarcely glandular cells. Intestine is divided in five histological regions, the first presents atyphlosole with two types of epithelium, simple columnar with stratified border; the rest of the tract has simple columnar epithelium with cilia, acidophilic granular glandular cells and folds of different sizes that increase or reduce the cavity duct. Based on previous this, we conclude that in this study exist differences principally in front region of digestive tract (buccal cavity, esophagus and stomach) compared to general descriptions realized for Prosobranchia subclass

  14. Estudio Histológico de Boca, Esófago, Estómago e Intestino de Polystira albida (Gastropoda: Turridae Histology Study of Mouth, Esophagus, Stomach and Intestine of Polystira albida (Gastropoda: Turridae

    Directory of Open Access Journals (Sweden)

    Ana Laura García-López

    2007-12-01

    Full Text Available En la presente investigación se realizó la caracterización histológica del tubo digestivo de Polystira albida (Toxoglossa:Turridae mediante microscopía óptica, utilizando ejemplares colectados en la Sonda de Campeche. Los resultados del análisis muestran que los labios, la boca y la probóscide presentan un epitelio cilindrico simple ciliado. La cavidad bucal tiene un epitelio cilindrico estratificado. El esófago presenta un epitelio cilindrico simple con células glandulares granulares acidófilas (naturaleza proteica, y es el sitio donde comienza la digestión. El estómago se divide en tres regiones histológicas, y tiene dos tipos de epitelio, uno cilindrico simple ciliado y otro cilindrico simple; el primero está formado por abundantes células glandulares acidófilas y basófilas (naturaleza proteica y glicoproteica', respectivamente; y el segundo contiene slo células glandulares acidófilas. La glándula digestiva está constituida por adenómeros túbulo-acinosos con células glandulares acidófilas y basófilas, en diferentes grados de secreción y los conductos presentan un epitelio cilindrico ciliado con células glandulares de ambos tipos. El intestino se divide en cinco regiones histológicas, la primera presenta un tiflosol con dos tipos de epitelio, cilindrico simple y cilindrico simple con chapa estriada; y el resto del tracto tiene un epitelio cilindrico simple ciliado con células glandulares granulares acidófilas y pliegues de diferentes tamaños que aumentan o reducen la cavidad del conducto. Se concluye que existen diferencias, principalmente en la región anterior del tubo digestivo (cavidad bucal, esófago y estómago, con respecto a las descripciones generales realizadas para la subclase ProsobranchiaIn the present investigation it was realized a histological characterization of the digestive tract of Polystira albida (Toxoglossa: Turridae, by using optic microscopy of specimens collected in Sonda de Campeche. Results of analysis show that lips, mouth and proboscis present a simple columnar epithelium with cilia. Buccal cavity has a stratified columnar epithelium. Esophagus presents a simple columnar epithelium with acidophilic granular glandular cells (proteic nature, and it is the place where digestion starts. Stomach is divided in three histological regions that have two epithelial types, simple columnar with cilia and without one; the first is formed by a lot of acidophilic and basophilic glandular cells (proteic and glycoproteic nature respectively, and the second only contains acidophilic glandular cells. Digestive gland is constituted by tubule-acinous adenomers with acidophilic and basophilic glandular cells in different grades of secretion, and ducts have simple columnar epithelium with cilia and scarcely glandular cells. Intestine is divided in five histological regions, the first presents atyphlosole with two types of epithelium, simple columnar with stratified border; the rest of the tract has simple columnar epithelium with cilia, acidophilic granular glandular cells and folds of different sizes that increase or reduce the cavity duct. Based on previous this, we conclude that in this study exist differences principally in front region of digestive tract (buccal cavity, esophagus and stomach compared to general descriptions realized for Prosobranchia subclass

  15. A new species of Leiostracus (Gastropoda, Pulmonata, Orthalicoidea) from Espírito Santo, Brazil / Nova espécie de Leiostracus (Gastropoda, Pulmonata, Orthalicoidea) do Espírito Santo, Brasil

    Scientific Electronic Library Online (English)

    Rodrigo B., Salvador; Daniel C., Cavallari.

    2014-09-01

    Full Text Available Uma extraordinária espécie nova de gastrópode pulmonado foi encontrada na coleção do Senckenberg Forschungninstitut und Naturmuseum Frankfurt (Frankfurt am Main, Alemanha) e é aqui descrita como Leiostracus faerie sp. nov. Esta espécie pode ser facilmente identificada por sua concha diminuta e trans [...] lúcida, com finas faixas axiais marrom-claras, e pela escultura de sua protoconcha. Ela é originária da região do Rio Doce, Espírito Santo, uma área conhecida por sua grande diversidade e endemicidade de gastrópodes terrestres. Esta descoberta mostra quão pouco é conhecida essa fauna e também reforça a importância das coleções de museus no estudo da biodiversidade e em medidas de conservação. Abstract in english A remarkable new species of pulmonate land snail was found in the collection of the Senckenberg Forschungninstitut und Naturmuseum Frankfurt (Frankfurt am Main, Germany) and is described here as Leiostracus faerie sp. nov. It can be easily identified by its small and translucent shell with fine axia [...] l light brown bands and its protoconch sculpture. It was collected in the Rio Doce ("Doce River") region in Espírito Santo, Brazil, an area known for a high diversity and endemicity of land snails. This discovery shows how little this fauna is known and reinforces the importance of museum collections in the study of biodiversity and conservation.

  16. Prosobrânquios terrestres do Brasil: Cyclophoridae: Neocyclotus (N. ) agassizi (Bartsch & Morrison, 1942) (Mollusca, Gastropoda, Mesogastropoda) / Land prosobranchs of Brazil: Cyclophoridae: Neocyclotus (N. ) agassizi (Bartsch & Morrison, 1942) (Mollusca, Gastropoda, Mesogastropoda)

    Scientific Electronic Library Online (English)

    Arnaldo C. dos Santos, Coelho; Norma Campos, Salgado.

    Full Text Available [...] Abstract in english Studies on specimens from Brazil (States of Pernambuco and Alagoas) were carried out in order to relate data about morphology of hard and soft parts o Nocyclotus (N.) agassizi (Bartsh & Morrison, 1942). [...

  17. Posición evolutiva de caracoles terrestres peruanos (Orthalicidae) entre los Stylommatophora (Mollusca: Gastropoda) / Evolutionary position of Peruvian land snails (Orthalicidae) among Stylommatophora (Mollusca: Gastropoda)

    Scientific Electronic Library Online (English)

    Jorge, Ramirez; Rina, Ramírez; Pedro, Romero; Ana, Chumbe; Pablo, Ramírez.

    2009-08-01

    Full Text Available Los géneros Bostryx y Scutalus (Orthalicidae: Bulimulinae) son endémicos de América del Sur y están principalmente distribuidos en la vertiente occidental de los Andes del Perú. El objetivo del presente trabajo fue evaluar su posición evolutiva dentro de los gastrópodos Stylommatophora basada en el [...] marcador mitocondrial 16S rRNA. Fueron obtenidas cuatro secuencias las que, junto con 28 de otros Stylommatophora disponibles en el GenBank, fueron alineadas con ClustalX. La reconstrucción filogenética se realizó mediante los métodos de Neighbor-Joining, Máxima Parsimonia, Máxima Verosimilitud e Inferencia Bayesiana. El alineamiento resultó en 371 sitios, con presencia de indels. Los dos géneros de la Familia Orthalicidae por primera vez incluidos en una filogenia molecular (Bostryx y Scutalus), formaron un grupo monofilético con otro miembro de la superfamilia Orthalicoidea (Placostylus), tal como lo obtenido con marcadores nucleares. Se discute también su relación evolutiva con otros caracoles terrestres. Abstract in english The genera Bostryx and Scutalus (Orthalicidae: Bulimulinae) are endemics from South America. They are mainly distributed on the western slopes of the Peruvian Andes. The goal of the present work was to assess their evolutionary position among the stylommatophoran gastropods based on the 16S rRNA mit [...] ochondrial marker. Four sequences were obtained, and along with 28 sequences of other Stylommatophora retrieved from the GenBank, were aligned with ClustalX. The phylogenetic reconstruction was carried out using the methods of Neighbor-Joining, Maximum Parsimony, Maximum Likelihood and Bayesian inference. The multiple sequence alignment had 371 sites, with indels. The two genera of the family Orthalicidae for the first time included in a molecular phylogeny (Bostryx and Scutalus), formed a monophyletic group along with another member of the superfamily Orthalicoidea (Placostylus), result that is comparable with that obtained with nuclear markers. Their evolutionary relationship with other land snails is also discussed.

  18. Desenvolvimento de Eurytrema coelomaticum (Giard & Billet (Digenea, Dicrocoeliidae em Bradybaena similaris (Férussac (Gastropoda, Xanthonychidae Development of Eurytrema coelomaticum (Giard & Billet (Digenea, Dicrocoeliidae in Bradybaena similaris (Férussac (Gastropoda, Xanthonychidae

    Directory of Open Access Journals (Sweden)

    Solange Viana Paschoal Blanco Brandolini

    2001-06-01

    Full Text Available To follow the larval developmenl of Eurytrema coelomaticum (Giard & Billet, 1892 in Bradybaena similaris (Férussac, 1821 snails were separated in three classes using the shell diameter: Class A (14.5-10.2 mm, Class B (10.1-6.9 mm and Class C (6.8-2.6 mm. Only snails belonging to classes A and B acquired the infection. Specimens of E. coelomaticum removed from the pancreatic ducts were exposed to three physiological solutions: Earle, Locke and saline 0.85%, to obtain eggs for the experimental infections, The Locke solution induced the best egg release. The route of migration the intramolluscan development of E. coelomaticum was studied with the aid of histology. The minimal period of intramolluscan developmenl, ending at the expelling of daughter sporocysts, was 107 days for the snails infected in March, and 79 days for the snails infected in November. The Student "t" test and the Chi-square test showed a significant difference (? = 5% between the two periods, although the mean temperature registered during the experiments did not significantly differed (? = 5%. The elimination of daughter sporocysts occurred through the snail's pneumostome, and always at night. Most sporocysts were eliminated at intervals that varied between one to three days, without regularity. The time of elimination of the daughter sporocysts was different for the two infection period studied: 12 weeks for the snails infected in March, and three weeks for those infected in November. Positive correlation between the number of sporocysts expelled by the snail host and higher temperatures registered in the laboratory was observed. This correlation was more evident in November infection.

  19. Report of a human accident caused by Conus regius (Gastropoda, Conidae Relato de um acidente em ser humano causado por Conus regius (Gastropoda, Conidae

    Directory of Open Access Journals (Sweden)

    Vidal Haddad Junior

    2009-08-01

    Full Text Available Conus regius is a venomous mollusc in the Conidae family, which includes species responsible for severe or even fatal accidents affecting human beings. This is the first report on a clinical case involving this species. It consisted a puncture in the right hand of a diver who presented paresthesia and movement difficulty in the whole limb. The manifestations disappeared after around twelve hours, without sequelae.Conus regius é um molusco venenoso da família Conidae, que inclui espécies responsáveis por acidentes graves ou mesmo fatais em humanos. Os autores relatam pela primeira vez um caso clínico envolvendo a espécie, que inclui uma punctura na mão direita de um mergulhador submarino, que apresentou parestesias e dificuldade de movimentação do membro todo. O quadro desapareceu em cerca de doze horas, sem seqüelas.

  20. Report of a human accident caused by Conus regius (Gastropoda, Conidae) / Relato de um acidente em ser humano causado por Conus regius (Gastropoda, Conidae)

    Scientific Electronic Library Online (English)

    Vidal, Haddad Junior; Marcus, Coltro; Luiz Ricardo L., Simone.

    2009-08-01

    Full Text Available Conus regius é um molusco venenoso da família Conidae, que inclui espécies responsáveis por acidentes graves ou mesmo fatais em humanos. Os autores relatam pela primeira vez um caso clínico envolvendo a espécie, que inclui uma punctura na mão direita de um mergulhador submarino, que apresentou pares [...] tesias e dificuldade de movimentação do membro todo. O quadro desapareceu em cerca de doze horas, sem seqüelas. Abstract in english Conus regius is a venomous mollusc in the Conidae family, which includes species responsible for severe or even fatal accidents affecting human beings. This is the first report on a clinical case involving this species. It consisted a puncture in the right hand of a diver who presented paresthesia a [...] nd movement difficulty in the whole limb. The manifestations disappeared after around twelve hours, without sequelae.

  1. Optimización de la solución de extracción de moléculas antibacterianas de Cenchritis muricatus (Gastropoda:Littorinidae) / Optimization of extracting solutions of antibacterial molecules from Cenchritis muricatus (Gastropoda:Littorinidae)

    Scientific Electronic Library Online (English)

    Annia Alba, Menéndez; Carlos, López Abarrategui; Antonio A, Vázquez Perera; Anselmo J, Otero González.

    2011-08-01

    Full Text Available Introducción: los moluscos marinos constituyen un reservorio natural de moléculas con potencialidades terapéuticas para el tratamiento de enfermedades infecciosas en momentos en que se han descrito numerosas cepas resistentes a los antibióticos convencionales. Objetivo: comparar 3 soluciones: ácido [...] acético 30 %, metanol 50 % y salina-ácida (NaCl 0,6 mol/L, HCl 1 %) atendiendo a sus capacidades extractivas de moléculas con actividad antibacteriana del molusco marino Cenchritis muricatus. Métodos: para el procesamiento del material biológico se utilizaron las 3 soluciones de extracción y se analizaron los extractos obtenidos de acuerdo con la concentración de proteínas totales y la inhibición del crecimiento bacteriano de cepas de Staphylococcus aureus y Escherichia coli, mediante un bioensayo turbidimétrico en microplacas de 96 pocillos en medio Luria-Bertani. Resultados: se obtuvo mayor concentración de proteínas totales (7,8 mg/mL) con el extracto total de C. muricatus obtenido con la solución salina-ácida. Además con 200 mg/mL de proteínas totales del extracto se obtuvo inhibición significativa (p Abstract in english Introduction: marine mollusks are natural reservoirs of molecules with therapeutic potential for the treatment of infectious diseases, at a time when many antibiotic-resistant strains are being described. Objective: to compare three solutions: 30% acetic acid, 50% methanol and saline-acid (NaCl 0.6 [...] mol/L, 1% HCl) according to their capacities to extract molecules with antimicrobial activity from the marine mollusk Cenchritis muricatus. Methods: the three extraction solutions were used to process the biological material, and then, the obtained extracts were analyzed in terms of total protein concentration and the bacterial growth inhibition of Staphylococcus aureus and Escherichia coli strains by means of a turbidimetric bioassay using 96 well microplates in Luria-Bertani (LB) culture medium. Results: the highest total protein concentration (7.8 mg/mL) was found in the C. muricatus extract from the saline-acid solution. Additionally, 200 mg/mL of total proteins from the extract caused significant growth inhibition (p

  2. The genus Plesiophysa, with a redescription of P. ornata (Haas, 1938) (Gastropoda: Planorbidae) / O gênero Plesiophysa, com redescrição de P. ornata (Haas, 1938) (Gastropoda: Planorbidae)

    Scientific Electronic Library Online (English)

    W. L., PARAENSE.

    2002-05-01

    Full Text Available É apresentada uma descrição de caracteres conquiliológicos e anatômicos do molusco planorbídeo Plesiophysa ornata (Haas, 1938), baseada em material topotípico, de 14 outras localidades dos seguintes Estados brasileiros: Rio Grande do Norte, Paraíba, Sergipe, Bahia, Espírito Santo e Minas Gerais. Dev [...] ido à grande semelhança de suas conchas, uma distinção segura das cinco espécies de Plesiophysa até agora descritas (P. pilsbryi, P. granulata, P. guadeloupensis, P. ornata e P. hubendicki) só é possível por intermédio de suas características anatômicas. Os dados sobre B. hubendicki indicam alta probabilidade de sinonímia com P. ornata. São necessárias investigações sobre a anatomia de P. pilsbryi e P. guadeloupensis para definir sua relação taxionômica com as outras espécies nominais. Abstract in english A redescription of conchological and anatomical characters of the planorbid mollusc Plesiophysa ornata (Haas, 1938) is presented, based on topotypic material and specimens from 14 additional localities in the Brazilian states of Rio Grande do Norte, Paraíba, Sergipe, Bahia, Espírito Santo and Minas [...] Gerais. Due to the close similarity of their shells, a sure discrimination of the five species of Plesiophysa described so far (P. pilsbryi, P. granulata, P. guadeloupensis, P. ornata and P. hubendicki) is only possible through their anatomical features. The present study points to the high probability of synonymy of P. hubendicki with P. ornata. Investigations on the anatomy of P. pilsbryi and P. guadeloupensis are needed to define their taxonomic relation with the other nominal species.

  3. Patterns of diversity of the Rissoidae (Mollusca: Gastropoda) in the Atlantic and the Mediterranean region.

    Science.gov (United States)

    Ávila, Sérgio P; Goud, Jeroen; de Frias Martins, António M

    2012-01-01

    The geographical distribution of the Rissoidae in the Atlantic Ocean and Mediterranean Sea was compiled and is up-to-date until July 2011. All species were classified according to their mode of larval development (planktotrophic and nonplanktotrophic), and bathymetrical zonation (shallow species--those living between the intertidal and 50?m depth, and deep species--those usually living below 50?m depth). 542 species of Rissoidae are presently reported to the Atlantic Ocean and the Mediterranean Sea, belonging to 33 genera. The Mediterranean Sea is the most diverse site, followed by Canary Islands, Caribbean, Portugal, and Cape Verde. The Mediterranean and Cape Verde Islands are the sites with higher numbers of endemic species, with predominance of Alvania spp. in the first site, and of Alvania and Schwartziella at Cape Verde. In spite of the large number of rissoids at Madeira archipelago, a large number of species are shared with Canaries, Selvagens, and the Azores, thus only about 8% are endemic to the Madeira archipelago. Most of the 542-rissoid species that live in the Atlantic and in the Mediterranean are shallow species (323), 110 are considered as deep species, and 23 species are reported in both shallow and deep waters. There is a predominance of nonplanktotrophs in islands, seamounts, and at high and medium latitudes. This pattern is particularly evident in the genera Crisilla, Manzonia, Onoba, Porosalvania, Schwartziella, and Setia. Planktotrophic species are more abundant in the eastern Atlantic and in the Mediterranean Sea. The results of the analysis of the probable directions of faunal flows support the patterns found by both the Parsimony Analysis of Endemicity and the geographical distribution. Four main source areas for rissoids emerge: Mediterranean, Caribbean, Canaries/Madeira archipelagos, and the Cape Verde archipelago. We must stress the high percentage of endemics that occurs in the isolated islands of Saint Helena, Tristan da Cunha, Cape Verde archipelago and also the Azores, thus reinforcing the legislative protective actions that the local governments have implemented in these islands during the recent years. PMID:22693430

  4. Cercariae of trematodes from Bythinella austriaca (Frauenfeld, 1857) agg. (Gastropoda, Prosobranchia).

    Czech Academy of Sciences Publication Activity Database

    Faltýnková, Anna; Literák, I.

    2002-01-01

    Ro?. 47, ?. 3 (2002), 196?204. ISSN 1230-2821 Institutional research plan: CEZ:AV0Z6022909 Keywords : cercariae * Trematoda * Bythinella austriaca Subject RIV: EG - Zoology Impact factor: 0.732, year: 2002

  5. A new species of hydrobiid snails (Mollusca, Gastropoda, Hydrobiidae) from central Greece

    OpenAIRE

    Canella Radea

    2011-01-01

    A new minute valvatiform species belonging to the genus Daphniola Radoman 1973, Daphniola eptalophos sp. n., from mountain Parnassos, Greece is described. The new species has a transparent valvatiform-planispiral shell, wide and open umbilicus, grey-black pigmented soft body and head and a black penis with a small colorless outgrowth on the left side near its base. A comparative table of shell dimensions and a key to the species known for this endemic genus for Greece are provided.

  6. Sphincterochilidae from Tunisia, with a note on the subgenus Rima Pallary, 1910 (Gastropoda, Pulmonata

    Directory of Open Access Journals (Sweden)

    Said Nouira

    2011-12-01

    Full Text Available In order to establish an updated checklist of terrestrial gastropod from Tunisia, a revision of the species of Sphincterochilidae is presented, using bibliographic and museum records and the results of our own field work. As a result, only two species, Sphincterochila candidissima and S. tunetana, are accepted to occur in Tunisia, and their type specimens are illustrated. The study of the morphological characters of the genital organs of both species clarified their subgeneric affiliation. Comparison of S. tunetana with S. cariosa from Lebanon showed that the first has to be classified within the subgenus Albea, and the latter within Sphincterochila s. str.; the subgenus Rima Pallary, 1910 remains in the synonymy of Sphincterochila s. str. Bibliographic records of S. baetica and S. otthiana from Tunisia could not be confirmed, the latter probably lives close to the border with Algeria.

  7. Sphincterochilidae from Tunisia, with a note on the subgenus Rima Pallary, 1910 (Gastropoda, Pulmonata)

    OpenAIRE

    Said Nouira; Intidhar Abbes; Eike Neubert

    2011-01-01

    In order to establish an updated checklist of terrestrial gastropod from Tunisia, a revision of the species of Sphincterochilidae is presented, using bibliographic and museum records and the results of our own field work. As a result, only two species, Sphincterochila candidissima and Sphincterochila tunetana, are accepted to occur in Tunisia, and their type specimens are illustrated. The study of the morphological characters of the genital organs of both species clarified their subgeneric af...

  8. Synopsis of valid species-group taxa for freshwater Gastropoda recorded from the European Neogene

    OpenAIRE

    Neubauer, Thomas A.; Kroh, Andreas; Harzhauser, Mathias; Georgopoulou, Elisavet; Mandic, Oleg

    2014-01-01

    Here we present a complete list of all valid species-group taxa of freshwater gastropods reported from Miocene and Pliocene deposits in Europe. The last comparable work dates back to the 1920s and covered about 1,600 names. The extensive literature research underlying the present work revealed considerable changes in the taxonomic and systematic frameworks of Neogene freshwater gastropods and yielded a total number of 2,156 accepted taxa. Each taxon is accompanied by a full citation of its fi...

  9. Crecimiento del caracol Strombus gigas (Gastropoda: Strombidae) en cuatro ambientes de Quintana Roo, México

    Scientific Electronic Library Online (English)

    Alberto de Jesús, Navarrete.

    2001-03-01

    Full Text Available Se estudió la tasa de crecimiento de caracoles cultivados en corrales en cuatro ambientes diferentes. El cultivo se realizó de octubre de 1993 a marzo de 1994. 16 corrales de 50 m² de área cada uno, cuatro por ambiente, fueron colocados en los siguientes ambientes: Thalassia, Thalassia-arena, Arena [...] y Coral, todos dentro de la laguna arrecifal en Punta Gavilán y Banco Chinchorro. En cada ambiente se introdujeron 20 caracoles de las siguientes tallas: 1) 100-120, 2) 120-140, 3) 140-160 y 4) 160-180 mm de longitud de concha. Los caracoles se midieron mensualmente con un vernier con una precisión de un mm. El crecimiento se evaluó por dos métodos: a) el incremento marginal promedio de la concha y por el método de Gulland-Holt. En el primer método, el ambiente Arena mostró el mayor crecimiento (3.21 + 0.26 mm/mes) en Punta Gavilán, mientras que en Banco Chinchorro, el mayor crecimiento ocurrió en coral (2.31 + 0.44 mm/mes). Con el segúndo método la mayor longitud asintótica en Punta Gavilán se midió en Thalassia-arena (287.5 mm), mientras que en Banco Chinchorro, la mayor longitud asintótica se midió en Arena (318.1 mm). Existieron diferencias significativas en el crecimiento entre los sitios y eso muestra que el crecimiento de los juveniles se relaciona con la cantidad de alimento disponible el cual fue mayor en Thalassia y Thalassia-arena. Sin embargo se requiere evaluar la cantidad de alimento, principalmente microfitobentos en los ambientes sin vegetación como Arena y Coral. Abstract in english The growth rate of queen conch cultured in pens was studied from October 1993 to March 1994. Sixteen pens (50 m² each, four pens per environment), were set in four environments: Thalassia, Thalassia-sand, Sand and Coral within a reef lagoon on Punta Gavilan and Banco Chinchorro. Twenty conchs were i [...] ntroduced in each pen (sizes: 100-120, 120-140, 140-160 and 160-180 mm shell length) and measured monthly to the nearest mm. Growth rate was assessed by two methods: a) shell marginal mean increase and b) the Gulland-Holt method considering all conch within pens. In the first method, the environment Sand had the highest growth (3.21 + 0.26 mm/month) at Punta Gavilan, whereas at Banco Chinchorro, highest growth was recorded in Coral (2.31 + 0.44 mm/month). Considering the second method, highest asymptotic length conch in Punta Gavilan occurred in Thalassia-sand (287.5 mm), whereas in Banco Chinchorro the highest asymptotic length was measured in Sand (318.1 mm). There were significant differences in growth between sites; juvenile growth is related with habitat quality mainly food availability.

  10. Données nouvelles sur les mollusques (Mollusca, Gastropoda du Parc national du Mercantour (France

    Directory of Open Access Journals (Sweden)

    Olivier Gargominy

    2006-01-01

    Full Text Available Since 2001, the molluscan fauna of the Mercantour National Park has been surveyed in the framework of a convention between the Park and the National Museum of Natural History (Paris. This has yielded 270 sampled localities representing 1094 data of species occurrences, of which 955 are situated within the Park. A total of 119 terminal taxa have been recorded from the Park, a quarter of which are of biological importance for France, confirming the high biodiversity value of the Park. At least 4 species, and possibly 6, are strictly endemic to the Park, with an additional 11 terminal taxa having most of their global populations within the Park. The peripheral zone is the richest part of the Park and the most important for the protection of remarkable species or subspecies, harbouring 93% of the total fauna and all but two of the (subendemic taxa. Here we provide new data on the distribution and ecology of 24 terminal taxa, some of which were previously only known from their original description, more than one century ago. Cochlostoma (Turritus acutum (Caziot, 1908 is separated as an independent species from C. (T. simrothi (Caziot, 1908, as well as Monacha (Eutheba martensiana (Tiberi, 1869 from M. (E. cemenelea (Risso, 1826. Clausilia euzieriana Bourguignat, 1869 is synonymised with Macrogastra (Pyrostoma mellae mellae (Stabile, 1864, while former citations of this taxon are referred to M. (P. mellae leia (Bourguignat, 1877. Chilostoma (Cingulifera cingulatum liguricum (Kobelt, 1876 is transferred as a subspecies of Ch. (C. frigidum (Mortillet, 1861 and is added to the French fauna. Arianta arbustorum vareliensis Ripken & Falkner, 2000 is added to the Italian fauna, as well as a mountainous species of Urticicola to which a name has yet to be applied. Evaluation of the IUCN criteria for redlisting concludes that Cochlostoma acutum, Macrogastra mellae leia and Chilostoma frigidum liguricum should be redlisted as VU D2.

  11. Crecimiento del caracol Strombus gigas (Gastropoda: Strombidae en cuatro ambientes de Quintana Roo, México

    Directory of Open Access Journals (Sweden)

    Alberto de Jesús Navarrete

    2001-03-01

    Full Text Available Se estudió la tasa de crecimiento de caracoles cultivados en corrales en cuatro ambientes diferentes. El cultivo se realizó de octubre de 1993 a marzo de 1994. 16 corrales de 50 m² de área cada uno, cuatro por ambiente, fueron colocados en los siguientes ambientes: Thalassia, Thalassia-arena, Arena y Coral, todos dentro de la laguna arrecifal en Punta Gavilán y Banco Chinchorro. En cada ambiente se introdujeron 20 caracoles de las siguientes tallas: 1 100-120, 2 120-140, 3 140-160 y 4 160-180 mm de longitud de concha. Los caracoles se midieron mensualmente con un vernier con una precisión de un mm. El crecimiento se evaluó por dos métodos: a el incremento marginal promedio de la concha y por el método de Gulland-Holt. En el primer método, el ambiente Arena mostró el mayor crecimiento (3.21 + 0.26 mm/mes en Punta Gavilán, mientras que en Banco Chinchorro, el mayor crecimiento ocurrió en coral (2.31 + 0.44 mm/mes. Con el segúndo método la mayor longitud asintótica en Punta Gavilán se midió en Thalassia-arena (287.5 mm, mientras que en Banco Chinchorro, la mayor longitud asintótica se midió en Arena (318.1 mm. Existieron diferencias significativas en el crecimiento entre los sitios y eso muestra que el crecimiento de los juveniles se relaciona con la cantidad de alimento disponible el cual fue mayor en Thalassia y Thalassia-arena. Sin embargo se requiere evaluar la cantidad de alimento, principalmente microfitobentos en los ambientes sin vegetación como Arena y Coral.The growth rate of queen conch cultured in pens was studied from October 1993 to March 1994. Sixteen pens (50 m² each, four pens per environment, were set in four environments: Thalassia, Thalassia-sand, Sand and Coral within a reef lagoon on Punta Gavilan and Banco Chinchorro. Twenty conchs were introduced in each pen (sizes: 100-120, 120-140, 140-160 and 160-180 mm shell length and measured monthly to the nearest mm. Growth rate was assessed by two methods: a shell marginal mean increase and b the Gulland-Holt method considering all conch within pens. In the first method, the environment Sand had the highest growth (3.21 + 0.26 mm/month at Punta Gavilan, whereas at Banco Chinchorro, highest growth was recorded in Coral (2.31 + 0.44 mm/month. Considering the second method, highest asymptotic length conch in Punta Gavilan occurred in Thalassia-sand (287.5 mm, whereas in Banco Chinchorro the highest asymptotic length was measured in Sand (318.1 mm. There were significant differences in growth between sites; juvenile growth is related with habitat quality mainly food availability.

  12. Gastropoda, Pulmonata, Helicidae, Cepaea nemoralis (Linnaeus, 1758): New records for Montreal, Canada

    OpenAIRE

    Örstan, A.

    2010-01-01

    The European land snail Cepaea nemoralis (Linnaeus, 1758) was introduced in North America in 1857 inBurlington, New Jersey, U.S.A. There is only one anedoctal record of C. nemoralis from Montreal, Canada, but without a dateor an exact location. In this note, recent records of C. nemoralis are presented for Montreal, based on surveys from 7 to 9August 2009 along a southwest to northeast transect parallel to the Montreal-Dorion-Rigaud commuter railroad.

  13. Gastropoda, Pulmonata, Helicidae, Cepaea nemoralis (Linnaeus, 1758: New records for Montreal, Canada

    Directory of Open Access Journals (Sweden)

    Örstan, A.

    2010-01-01

    Full Text Available The European land snail Cepaea nemoralis (Linnaeus, 1758 was introduced in North America in 1857 inBurlington, New Jersey, U.S.A. There is only one anedoctal record of C. nemoralis from Montreal, Canada, but without a dateor an exact location. In this note, recent records of C. nemoralis are presented for Montreal, based on surveys from 7 to 9August 2009 along a southwest to northeast transect parallel to the Montreal-Dorion-Rigaud commuter railroad.

  14. Ecomorphological Analyses of Marine Mollusks' Shell Thickness of Rapana venosa (VALENCIENNES, 1846 (Gastropoda: Muricidae

    Directory of Open Access Journals (Sweden)

    Igor P. Bondarev

    2013-10-01

    Full Text Available Shell thickness of Rapana venosa was investigated from ecologically different places of the Azov – Black Sea basin. In the formation of the shell thickness there are two major trends: thickening with age, and inversely proportional to the size of the thickening of even-aged individuals of the same population. Shell thickness formation was analyzed in connection with biotic and abiotic environmental factors of influence. R. venosa ontogeny is not conducive to the rapid succession newly acquired characters in local populations. The formation of a thick shell is mainly the individual response of bions to the environment. Individuals’ of the same type reaction is the cause of formation of specific conchological characters of separate populations or parts thereof. Mechanical impacts (e.g. damage by breaking predators and storm waves hitting on rocks have no significant effect on the increasing of thickness of shells. Comparative analysis of the thickness of the shell of R. venosa from areas with different salinity shows that the direct relationship between these parameters is absent. R. venosa is capable of forming its own salinity medium in the mantle cavity, which is different from the external environment. The main factor influencing the formation of a thick-walled shell is the amplitude of the temperature fluctuations in the locality. Shell thickness of R. venosa was considered as ecomorphological character in comparison with the same feature of shell-bearing mollusks from the World Ocean at different latitude zones. It is shown that high temperature gradient is one of the most important factors of forming a thick shell. The greatest show this intertidal species and ecomorphs of temperate and high latitudes, where the temperature gradients are most expressed.

  15. Locomotion of Stramonita haemastoma (Linnaeus (Gastropoda, Muricidae on a mixed shore of rocks and sand

    Directory of Open Access Journals (Sweden)

    Marcos G. Papp

    2001-03-01

    Full Text Available Mixed shores of rocks and sand are appropriate systems for the study of limitations that the isolation of rocks may impose for gastropods that typically inhabit rocky shores. We marked 52 Stramonita haemastoma (Linnaeus, 1767 snails on a mixed shore and found that 34 of them moved between rocks one to four times during 15 surveys in a period of 72 days. In the experiments, the snails moved on rock by continuous, direct, ditaxic, alternate undulations of the foot sole but on submerged sand they used slower arrhythmic discontinuous contractions of the foot sole. They switched between modes of locomotion in response to the type and topography of the substrate and possibly to water dynamics. In nature, snails moved between rocks forming aggregations where they oviposited. This may have masked other causes of movement, such as availability of prey. Most snails burrowed into the sand when the rocks became exposed during low tides. Further experiments are needed to explicitly address the possible causes of movements among rocks and burial.

  16. Colour morphotypes of Elysia timida (Sacoglossa, Gastropoda) are determined by light acclimation in food algae

    OpenAIRE

    J. COSTA; Giménez Casalduero, Francisca; Melo, Ricardo; Jesus, Bruno

    2012-01-01

    Elysia timida (Risso, 1818) colonizing the shallow waters of the Mar Menor Lagoon (Spain) exhibit a brown and a green morph. It was hypothesised that these morphs were the result of feeding preferentially on brown and green algae, respectively. E. timida and its potential food sources, Acetabularia acetabulum (Chlorophyta) and Halopteris filicina (Heterokontophyta) were collected by snorkelling during April 2010. Photosynthetic pigments were analysed by HPLC, photo-physiological parameters we...

  17. EPR Investigation of Gamma-Irradiated Rapana Thomasiana (Gastropoda, Muricidae) Shell

    International Nuclear Information System (INIS)

    The shell of Rapana Thomasiana snail, a carnivorous gastropod collected from the coasts of the Black Sea (Romania) was investigated by using Electron Paramagnetic Resonance (EPR) spectroscopy. The samples in powder form were irradiated with a 60Co gamma-ray source at ambient temperature in the dose range between 1.06 and 11.3 kGy. The measurements showed that the EPR signal intensity enhanced following saturation exponential with the absorbed dose. The estimated EPR parameters: g1 = 1.9976, g2 = 2.0006, g3 = 2.0015, g4 = 2.0030 and g5 = 2.0043 revealed a complex spectrum consisting of CO2-, CO33- and CO3- species. A very weak signal at g6 = 2.0057 was associated to SO2- electron center. All EPR signals of gamma-irradiated samples decreased with various rate with the of 100 deg. C isothermal annealing time

  18. Population ecology and fishery of Cittarium pica (Gastropoda: Trochidae on the Caribbean coast of Costa Rica

    Directory of Open Access Journals (Sweden)

    Stefanie Schmidt

    2002-12-01

    Full Text Available The West Indian Topshell Cittarium pica is artisanally collected on rocky shores along the Caribbean Coast of Costa Rica. There are neither data on the state of its exploitation nor exist any regulation of the fishery. From October 2000 to March 2001, the population dynamics of this species were studied at an unexploited and two exploited sites to determine the present impact of the fishery on the resource. Average population density with 14 ind./m² about three times higher at the unexploited than at the exploited sites. Length-frequeney histograms showed a strong shift towards smaller specimens at the exploited sites, which is also reflected in significantly higher rates of total mortality (Z = 4.05 and 4.47 when compared to the unexploited site (Z = 1.47. Von Bertalanffy growth parameters were estimated as k = 0.19-0.28 (yr-1 and L?= 104 mm. No significant differences were found among sites. From these values a range of the growth performance index ? was computed ( ? = 3.31-3.48 which lies at the lower end of the values reported for other tropical marine gastropods. The size at first maturity for both sexes combined was estimated as 29.20 ± 1.14 mm. Exploitation rates >0.6 for both exploited sites and a large fraction of small specimens (El caracol Cittarium pica (West Indian Top Shell es recolectado en forma artesanal en zonas rocosas de la costa Caribe de Costa Rica. A la fecha no hay datos sobre esta extracción ni existe regulación de su pesquería. La dinámica poblacional de esta especie fue evaluada, desde octubre del 2000 hasta marzo del 2001, en dos sitios en los cuales la especies es recolectada (Playa Negra y Cahuita, y en un sitio protegido de la actividad pesquera (Isla Uvita. La densidad promedio de la población fue 14 ind/m², cerca de tres veces más alta en el sitio protegido que en los dos no protegidos. Los histogramas de frecuencia de tallas mostraron un fuerte sesgo hacia los ejemplares más pequeños en los sitios no protegidos, lo que se refleja también en tasas de mortalidad total significativamente más altas (Z = 4.05 y 4.47 cuando se les compara con el sitio protegido (Z = 1.47. Los parámetros de crecimiento según von Bertalanffy fueron estirnados en k = 0.19 - 0.28 / año y L?= 104 mm. No se encontró diferencias significativas entre los sitios. A partir de estos valores el índice ? (performance index ? estuvo en un ?mbito de 3.31 a 3.48, el cual se encuentra entre los valores bajos informados para otros gastrópodos tropicales. La edad a la primera madurez sexual para ambos sexos combinados fue estimada en 29.20 ± 1.14 mm. Las tasas de explotación fueron mayores a 0.6 para los sitios no protegidos y un alto componente de ejemplares pequeños (menos de 30 mm en las recolectas, sugieren una sobre explotación de los adultos y sobrepesca en el reclutamiento. Con base en la estimación de la captura máxima sostenible (maximum sustainable yield, se recomienda algunas medidas reguladores de la pesquería como el control de un tamaño mínimo de desernbarque de 40 mm y la veda de la pesquería durante los rneses de reproducción (de julio a noviembre.

  19. Population ecology and fishery of Cittarium pica (Gastropoda: Trochidae) on the Caribbean coast of Costa Rica

    Scientific Electronic Library Online (English)

    Stefanie, Schmidt; Matthias, Wolff; José A., Vargas.

    1079-10-01

    Full Text Available El caracol Cittarium pica (West Indian Top Shell) es recolectado en forma artesanal en zonas rocosas de la costa Caribe de Costa Rica. A la fecha no hay datos sobre esta extracción ni existe regulación de su pesquería. La dinámica poblacional de esta especie fue evaluada, desde octubre del 2000 hast [...] a marzo del 2001, en dos sitios en los cuales la especies es recolectada (Playa Negra y Cahuita), y en un sitio protegido de la actividad pesquera (Isla Uvita). La densidad promedio de la población fue 14 ind/m², cerca de tres veces más alta en el sitio protegido que en los dos no protegidos. Los histogramas de frecuencia de tallas mostraron un fuerte sesgo hacia los ejemplares más pequeños en los sitios no protegidos, lo que se refleja también en tasas de mortalidad total significativamente más altas (Z = 4.05 y 4.47) cuando se les compara con el sitio protegido (Z = 1.47). Los parámetros de crecimiento según von Bertalanffy fueron estirnados en k = 0.19 - 0.28 / año y L?= 104 mm. No se encontró diferencias significativas entre los sitios. A partir de estos valores el índice ? (performance index ?) estuvo en un ?mbito de 3.31 a 3.48, el cual se encuentra entre los valores bajos informados para otros gastrópodos tropicales. La edad a la primera madurez sexual para ambos sexos combinados fue estimada en 29.20 ± 1.14 mm. Las tasas de explotación fueron mayores a 0.6 para los sitios no protegidos y un alto componente de ejemplares pequeños (menos de 30 mm) en las recolectas, sugieren una sobre explotación de los adultos y sobrepesca en el reclutamiento. Con base en la estimación de la captura máxima sostenible (maximum sustainable yield), se recomienda algunas medidas reguladores de la pesquería como el control de un tamaño mínimo de desernbarque de 40 mm y la veda de la pesquería durante los rneses de reproducción (de julio a noviembre). Abstract in english The West Indian Topshell Cittarium pica is artisanally collected on rocky shores along the Caribbean Coast of Costa Rica. There are neither data on the state of its exploitation nor exist any regulation of the fishery. From October 2000 to March 2001, the population dynamics of this species were stu [...] died at an unexploited and two exploited sites to determine the present impact of the fishery on the resource. Average population density with 14 ind./m² about three times higher at the unexploited than at the exploited sites. Length-frequeney histograms showed a strong shift towards smaller specimens at the exploited sites, which is also reflected in significantly higher rates of total mortality (Z = 4.05 and 4.47) when compared to the unexploited site (Z = 1.47). Von Bertalanffy growth parameters were estimated as k = 0.19-0.28 (yr-1) and L?= 104 mm. No significant differences were found among sites. From these values a range of the growth performance index ? was computed ( ? = 3.31-3.48) which lies at the lower end of the values reported for other tropical marine gastropods. The size at first maturity for both sexes combined was estimated as 29.20 ± 1.14 mm. Exploitation rates >0.6 for both exploited sites and a large fraction of small specimens (

  20. Patterns of Diversity of the Rissoidae (Mollusca: Gastropoda) in the Atlantic and the Mediterranean Region

    OpenAIRE

    A?vila, Se?rgio P.; Goud, Jeroen; Frias Martins, Anto?nio M.

    2012-01-01

    The geographical distribution of the Rissoidae in the Atlantic Ocean and Mediterranean Sea was compiled and is up-to-date until July 2011. All species were classified according to their mode of larval development (planktotrophic and nonplanktotrophic), and bathymetrical zonation (shallow species—those living between the intertidal and 50?m depth, and deep species—those usually living below 50?m depth). 542 species of Rissoidae are presently reported to the Atlantic Ocean and the Medit...

  1. Terrestrial slugs (Gastropoda, Pulmonata) in the NATURA 2000 areas of Cyprus island.

    Science.gov (United States)

    Vardinoyannis, Katerina; Demetropoulos, Simon; Mylonas, Moissis; A Triantis, Kostas; Makris, Christodoulos; Georgiou, Gabriel; Wiktor, Andrzej; Demetropoulos, Andreas

    2012-01-01

    Terrestrial slugs of the Island of Cyprus were recently studied in the framework of a study of the whole terrestrial malacofauna of the island. The present work was carried out in the Natura 2000 conservation areas of the island in 155 sampling sites over three years (2004-2007). Museum collections as well as literature references were included. In total six species are present in the Natura 2000 areas of the island, belonging to three families: Limacidae, Agriolimacidae and Milacidae. One of the species, Milax riedeli, is a new record for the island. The distribution of the species across the island and in the surrounding areas is discussed. PMID:22451785

  2. Terrestrial slugs (Gastropoda, Pulmonata) in the NATURA 2000 areas of Cyprus island

    OpenAIRE

    Katerina Vardinoyannis; Simon Demetropoulos; Moissis Mylonas; Triantis,Kostas A.; Christodoulos Makris; Gabriel Georgiou; Andrzej Wiktor; Andreas Demetropoulos

    2012-01-01

    Terrestrial slugs of the Island of Cyprus were recently studied in the framework of a study of the whole terrestrial malacofauna of the island. The present work was carried out in the Natura 2000 conservation areas of the island in 155 sampling sites over three years (2004–2007). Museum collections as well as literature references were included. In total six species are present in the Natura 2000 areas of the island, belonging to three families: Limacidae, Agriolimacidae and Milacidae. One of...

  3. On the occurrence of Oxychilus camelinus (Bourguignat, 1852 in Bulgaria (Gastropoda: Zonitidae

    Directory of Open Access Journals (Sweden)

    Dilian Georgiev

    2014-04-01

    Full Text Available Adult shells and living specimens of the terrestrial gastropod Oxychilus camelinus were collected on Rahat Tepe Hill in Plovdiv city, and in Stara Zagora. These records confirm the findings of Hesse (1913 of the occurrence of this species in Bulgaria.

  4. A new species of Nassarius (Gastropoda, Nassariidae) from Canopus Bank, off Northeast Brazil

    Scientific Electronic Library Online (English)

    Daniel, Abbate; Daniel Caracanhas, Cavallari.

    Full Text Available Nassarius levis sp. nov. é descrita para o banco de Canopus, estado do Ceará, Brasil com base na morfologia da concha. Difere das outras espécies locais por apresentar uma concha mais alongada, com um escudo parietal pouco desenvolvido e uma superfície notavelmente lisa. Essa última característica a [...] inda não foi descrita entre as espécies de Nassarius do Atlântico oeste, mas é comum a outros congêneres do Atlântico leste, como Nassarius elatus (Gould, 1845) e Indo-Pacífico, como Nassarius excellens (Kuroda & Habe, 1961). Abstract in english Nassarius levis sp. nov. is described from Canopus Bank, off Ceará, Northeast Brazil, based on shell morphology. It differs from other Brazilian species of the genus in having a more elongate shell, with a weakly developed parietal shield and a notably smooth surface. This last trait has not yet bee [...] n described among the Western Atlantic Nassarius, but it is common to other congeners from the Eastern Atlantic, such as Nassarius elatus (Gould, 1845) and the Indo-Pacific, such as Nassarius excellens (Kuroda & Habe, 1961).

  5. Nueva cita de Goniocylindrites hector (Coquand, 1865, Gastropoda, del Neocomiense-Barremiense de Montalbán (Teruel

    Directory of Open Access Journals (Sweden)

    Forner i Valls, E.

    2010-01-01

    Full Text Available Se da la segunda cita mundial de Goniocylindrites hector (Coquand, 1865, se amplía su distribución a Montalbán (Teruel y se aporta estudio biométrico de todos los ejemplares conocidos

  6. Growth Ecology of Pila globosa (Swainson) (Gastropoda: Pilidae) in Simulated Habitat

    OpenAIRE

    Md Sarwar Jahan; Mst. Shahida Akter; Md. Moniruzzaman Sarker

    2001-01-01

    Growth ecology of Pila globosa was studied in the simulated habitat with reference to its natural food habit. Growth rate and obesity index value for the snail population reared on natural aquatic food plants were higher than those, reared on cultivated food, Puni (Basela rubra). For natural food, the minimum and maximum mortality rates at age intervals of 224-238 days and 0-14 days were calculated as 0.00% and 16.00% while, on supplied cultivated vegetable food, (B. rubra) at 252-266 days an...

  7. Growth Ecology of Pila globosa (Swainson (Gastropoda: Pilidae in Simulated Habitat

    Directory of Open Access Journals (Sweden)

    Md. Sarwar Jahan

    2001-01-01

    Full Text Available Growth ecology of Pila globosa was studied in the simulated habitat with reference to its natural food habit. Growth rate and obesity index value for the snail population reared on natural aquatic food plants were higher than those, reared on cultivated food, Puni (Basela rubra. For natural food, the minimum and maximum mortality rates at age intervals of 224-238 days and 0-14 days were calculated as 0.00% and 16.00% while, on supplied cultivated vegetable food, (B. rubra at 252-266 days and 0-14 days age intervals, were obtained as 0.00% and 18.00% respectively. The life table was constructed on 266 days study of snails, reared on both types of food plants. The findings indicate the possibility of snail culture on large scale, in simulated habitats provided with physico-chemical parameters, like water temperature, pH, turbidity and dissolve oxygen of water, strictly maintained.

  8. Sexual Maturity and Sex Determination in Strombus canarium Linnaeus, 1758 (Gastropoda: Strombidae)

    OpenAIRE

    Zaidi Che Cob; Aziz Arshad; Japar Sidik Bujang; Mazlan Abd. Ghaffar

    2008-01-01

    The study was conducted at the Merambong Shoal, Johor Straits, Malaysia. Strombus canarium was the most abundant herbivorous mollusc within the study site, highly prized as seafood and contributes to the economics of the locals. Ontogenetic development of sex characters and sexual maturity were determined via logistic curve analysis, using shell-length and/or lip thickness as predictors. The minimum shell-length at which sex characters appeared was at 30 mm in males and 32 mm in females...

  9. Sexual Maturity and Sex Determination in Strombus canarium Linnaeus, 1758 (Gastropoda: Strombidae

    Directory of Open Access Journals (Sweden)

    Zaidi Che Cob

    2008-01-01

    Full Text Available The study was conducted at the Merambong Shoal, Johor Straits, Malaysia. Strombus canarium was the most abundant herbivorous mollusc within the study site, highly prized as seafood and contributes to the economics of the locals. Ontogenetic development of sex characters and sexual maturity were determined via logistic curve analysis, using shell-length and/or lip thickness as predictors. The minimum shell-length at which sex characters appeared was at 30 mm in males and 32 mm in females and both sexes can definitely be determined at more than 41 mm shell-length. The SX50 (probability of individuals can be sexed is 0.5 was at 38.33 ± 0.41 mm for male and at 37.15 ± 0.31 mm for female. The SL50 (length at which the probability of individuals are matured is 0.5 was at 54.14 ± 0.86 mm shell-lengths for males and at 58.51 ± 1.02 mm shell-lengths for females. The LIP50 (lip thickness at which the probability of individuals are matured is 0.5 values on the other hand was about 0.69 ± 0.0003 and 0.80 ± 0.014 mm for males and females respectively. The findings indicate that sexual dimorphisms occurred at very early stage in S. canarium life history.

  10. Unraveling the evolutionary history of the Chilostoma Fitzinger, 1833 (Mollusca, Gastropoda, Pulmonata) lineages in Greece.

    Science.gov (United States)

    Psonis, Nikolaos; Vardinoyannis, Katerina; Mylonas, Moisis; Poulakakis, Nikos

    2015-10-01

    The land snails of the genus Chilostoma Fitzinger, 1833 that includes, in Greece, the (sub)genera Cattania, Josephinella and Thiessea, are highly diversified and present high levels of endemism. However, their evolutionary history is unknown and their taxonomy is complex and continuously revised. The aim of this study is to investigate the phylogenetic relationships of the lineages of the genus Chilostoma distributed in Greece based on partial DNA sequences of two mitochondrial DNA (16S rRNA and COI) genes. Complete sequences of one nuclear gene (ITS1) representing the major mitochondrial lineages were also analyzed. The phylogenetic trees revealed three distinct major clades that correspond to the three (sub)genera. Several taxonomical incongruencies were made obvious, thus, raising questions about the "true" number of species in each clade, while rendering a taxonomic re-evaluation necessary. From a phylogeographic point of view, it seems that the three major phylogenetic clades were separated in the late Miocene. They started differentiating into distinct species during the Pliocene and Pleistocene through several vicariance and dispersal events. PMID:26049041

  11. Study on the contamination of transuranides in Pulmonata gastropoda collected in Palomares (Spain)

    International Nuclear Information System (INIS)

    A study on the contamination levels and distribution of plutonium and americium in gastropods collected in Palomares (south-east Spain) was performed. This region is partially contaminated with actinides following the 1966 nuclear accident. The existence of plutonium and americium in gastropods (Helix albicans and Theba pisana), along with their great gastronomic interest in the area, reinforces the concern in studying the incorporation of these radioelements to a trophic level of the alimentary chain. In this work, plutonium concentration levels have been determined in the excrements, washing waters, flesh and shell of different types of gastropods collected in various sampling campaigns. Pretreatment of the snail samples for further transuranics analyses was based on culinary customs of the region. First, the gastropods had a biological rest, allowing the removal of the non-adsorbed or non-retained ingested material, and then the excrements were collected by washing the snails. Water with excrements was filtered using different filters and analyzed separately. Once rinsed, the snails were dipped into salty water to eliminate the slime, finally, after boiling, the soft tissue was separated from the shell. Plutonium and americium analyses have been carried out sequentially, following normalized procedures for the determination of these radionuclides. The results show the distribution of plutonium in washing and boiling water, excrements, soft tissues and shell of the excrements, soft tissues and shell of the snails. Autoradiographies performed to soft tissues made evident that the contamination was incorporated into the gastropods as radioactive particles. In addition, it has been estimated that the consumption of one kilogram of snails collected in the most contaminated area of Palomares could reach 1/3 of the effective dose (due to ingestion) to the inhabitants of the area. (author)

  12. Study on the contamination by transuranides of Pulmonata gastropoda collected in Palomares (Spain)

    International Nuclear Information System (INIS)

    A study on the contamination levels and distribution of plutonium in gastropods collected in Palomares (south-east Spain) has been performed. This region is partially contaminated with actinides following the nuclear accident occurred in 1966. The existence of plutonium in gastropods (Helix albicans and Theba pisana) along with their great gastronomic interest in the area reinforces the concern in studying the incorporation of these radioelements into a trophic level of the alimentary chain. In this work, plutonium concentration levels have been determined in the excrements, washing waters, flesh and shell of different types of gastropods collected in the Palomares most contaminated area. Plutonium analyses have been carried out following normalized procedures for the determination of this radionuclide. The results show the distribution of plutonium in washing and boiling water, excrements, soft tissues and shell of the snails. In addition, it has been estimated that the consumption of one kilogram of snails collected in the most contaminated area of Palomares could contribute up to 1/3 of the effective dose (due to ingestion) to the inhabitants of the area. (author)

  13. Study on the contamination by transuranides of pulmonata gastropoda collected in palomares (Spain)

    Science.gov (United States)

    Aragón, A.; Espinosa, A.; Antón, M. P.

    2006-01-01

    A study on the contamination levels and distribution of plutonium in gastropods collected in Palomares (south-east Spain) has been performed. This region is partially contaminated with actinides following the nuclear accident occurred in 1966. The existence of plutonium in gastropods (Helix albicans and Theba pisana) along with their great gastronomic interest in the area reinforces the concern in studying the incorporation of these radioelements into a trophic level of the alimentary chain. In this work, plutonium concentration levels have been determined in the excrements, washing waters, flesh and shell of different types of gastropods collected in the Palomares most contaminated area. Plutonium analyses have been carried out following normalized procedures for the determination of this radionuclide. The results show the distribution of plutonium in washing and boiling water, excrements, soft tissues and shell of the snails. In addition, it has been estimated that the consumption of one kilogram of snails collected in the most contaminated area of Palomares could contribute up to 1/3 of the effective dose (due to ingestion) to the inhabitants of the area.

  14. A new species of Lataxiena Jousseaume, 1883 (Gastropoda: Muricidae) from the East and South China Seas

    Science.gov (United States)

    Zhang, Suping; Zhang, Shuqian

    2015-03-01

    A new muricid gastropod species, Lataxiena lutescena sp. nov., is described and illustrated. The new species was recognized during reidentification of the Muricidae collection in the Marine Biological Museum, Chinese Academy of Sciences, Qingdao. The specimens of the new species were collected from the East and South China Seas off Fujian, Guangdong, and Hainan Provinces. Lataxiena lutescena sp. nov. is similar to Lataxiena blosvillei (Deshayes, 1832) in general shape, but can be distinguished from the latter by the shell sculpture and radular characteristics. Lataxiena lutescena sp. nov. also resembles Lataxiena bombayana (Melvill, 1893), but differs from that species in the shell shape and anal notches and in lacking short spines on the shell.

  15. Spatial distribution of vermetids (Mollusca: Gastropoda in the Rocas Atoll, Equatorial South Atlantic

    Directory of Open Access Journals (Sweden)

    Marcelo de Oliveira Soares

    2010-08-01

    Full Text Available The Rocas Atoll is a biogenic reef located 266 km from the brazilian northeast coast. Its carbonate structure is formed by corals, calcareous algae, foraminifers and vermetids. Such studied vermetid species are indicators of the sea level and of intertidal or immediately subtidal paleoenvironments, being able to contribute to elucidate the geological history of the only atoll of the South Atlantic. Despite its importance as bioconstructors, there are few studies on the systematics and distribution of these mollusks in this oceanic reef system. Data was obtained on the species, density and distribution leeward and windward from the encrusting taphocoenosis. The species Dendropoma irregulare (d’Orbigny, 1842 and Petaloconchus varians (d’Orbigny, 1841 were recognized in different sectors of the reef system, mainly in the windward sector (0,26 ± 0,04 ind/cm2. In the wave-dominated side of the depositional system occur a lower bioaccumulation of the fossilized shells (0,11 ± 0,02 ind/cm2.

  16. A new species of hydrobiid snails (Mollusca, Gastropoda, Hydrobiidae from central Greece

    Directory of Open Access Journals (Sweden)

    Canella Radea

    2011-10-01

    Full Text Available A new minute valvatiform species belonging to the genus Daphniola Radoman 1973, Daphniola eptalophos sp. n., from mountain Parnassos, Greece is described. The new species has a transparent valvatiform-planispiral shell, wide and open umbilicus, grey-black pigmented soft body and head and a black penis with a small colorless outgrowth on the left side near its base. A comparative table of shell dimensions and a key to the species known for this endemic genus for Greece are provided.

  17. Metal distribution and metallothionein induction after cadmium exposure in the terrestrial snail Helix aspersa (Gastropoda, Pulmonata).

    Science.gov (United States)

    Hispard, Florian; Schuler, Dietmar; de Vaufleury, Annette; Scheifler, Renaud; Badot, Pierre-Marie; Dallinger, Reinhard

    2008-07-01

    The aim of the present work was to study the effect of Cd2+ exposure on metallothionein (MT) induction and on the distribution of metals (Cd, Cu, and Zn) in the terrestrial pulmonate Helix aspersa. In particular, the soluble and nonsoluble pools of the accumulated metals and their tissue distribution in uncontaminated and contaminated edible snails were investigated after a two-week exposure to Cd2+. In the soluble cytosolic pool of the midgut gland of H. aspersa, three metal-specific putative MT isoforms were separated following a fractionation protocol with diethylaminoethyl cellulose, size-exclusion chromatography, ultrafiltration, and reversed-phase high-performance liquid chromatography (RP-HPLC). Interestingly, one of the above isoforms seems to bind both Cd and Cu, which may in addition mobilize, after induction by Cd2+, some of the intracellular Cu and, thus, perhaps increase the Cu pool in the cytosolic fraction. The cDNA and its translated amino acid sequence of a Cd2+-binding MT isoform from the snail midgut gland was characterized and attributed to one of the putative MT isoforms obtained by RP-HPLC. The amino acid sequence of this Cd-MT isoform of H. aspersa differed from similar sequences described in other terrestrial pulmonates, such as Helix pomatia or Arianta arbustorum, by only a few amino acids (n = 4 and 8, respectively). That the identified Cd-MT from H. aspersa is inducible by Cd2+ also was shown, chromatographic evidence aside, by a specific polymerase chain reaction protocol on a cDNA basis, which included a noninducible housekeeping gene as a control. PMID:18384240

  18. Notocotylus biomphalariae n. sp. (Digenea: Notocotylidae)from Biomphalaria peregrina (Gastropoda: Pulmonata) in Patagonia, Argentina.

    Science.gov (United States)

    Flores, Verónica; Brugni, Norma

    2005-07-01

    A new species of Notocotylus was found parasiting a freshwater pulmonate snail, Biomphalaria peregrina. Naturally infected snails were collected from two temporary ponds in the Nahuel Huapí National Park in Patagonia. The characteristics of the larval stages are presented. Experimental adults were recovered from the intestinal caeca of ducks and chicks. Adults of Notocotylus biomphalariae n. sp. exhibit an aspinose tegument, two lateral rows of 11 ventral glands and a median row of four, a uterus with 12-16 coils of which 2-4 are previtelline, a metraterm equivalent in size to 65-68% of the cirrus-sac length, a previtelline field which extends to the middle of the body, a lobed testis and a genital pore closely posterior to the intestinal bifurcation. The rediae have one to three cercariae. The cercariae, when shed, are trioculate and have a long tail; they encyst in the environment and become infective 12 days after encystment. PMID:16025211

  19. Mapping of Buccal Neurons Innervating the Feeding Apparatus of Eobania vermiculata (Gastropoda, pulmonata

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    Amina Essawy

    2001-01-01

    Full Text Available The paired buccal ganglia of Eobania vermiculata were investigated by light and electron microscopical methods, and a surface map of the ganglia was constructed. Mostly eight paired plus an unpaired buccal nerves were observed in dissected animals. Four giant neurons with a diameter more than 100 ?m were identified in the lateral region of each ganglion. Besides the giant neurons, middle - ( 30-60?m as well as small- ( <30?m sized neurons were localized. Possible axonal projections of buccal neurons in the pharyngeal nerves innervating the buccal musculature were determined with the aid of retrograde infusion of cobalt lysine. Large amounts of neuro secretory granules in most neurons were also present. In the neuropile of the ganglion, synapses were found in large numbers which are of axo-axonic type. The map produced herein provides an important first step towards the neural circuitry controlling feeding behavior in Eobania vermiculata.

  20. Organ- and species-specific accumulation of metals in two land snail species (Gastropoda, Pulmonata)

    International Nuclear Information System (INIS)

    In order to evaluate the usefulness of terrestrial gastropods as bioindicators there is a need for studies that simultaneously compare (1) concentrations of metals in reference and polluted plots, (2) species within the same polluted habitat, (3) metal accumulation patterns in different organs and (4) metal accumulation patterns in relation to soil physicochemical properties. This study aims to assess metal accumulation patterns in two land snail species. Instead of analyzing an organism as a whole, investigating the partitioning of metals in different organs can provide information on the actual toxicological relevant fractions. Therefore, concentrations of Ag, Cd, Cr, Cu, Ni and Zn were examined in five different organs of Cepaea nemoralis, as well as in the foot and the body of Succinea putris. Snails were sampled at four polluted dredged sediment disposal localities and three adjacent less polluted reference plots situated along waterways in Flanders, Belgium. Due to the small size and problematic dissection of S. putris only the concentrations in the foot of both species could be compared. For this reason only, C. nemoralis can be described as a better bioindicator species that allows a far more detailed analysis of organ metal accumulation. This study showed that organs other than the digestive gland may be involved in the immobilization and detoxification of metals. Furthermore, pH, soil fractionation (clay %, silt %, sand %) and organic matter, correlate with metal accumulation in organs. However, most often the soil metal concentrations did not correlate with the concentrations found in snail organs. Metal concentrations in organs of both species (1) differed among polluted plots but rarely between polluted and reference plots within a locality, (2) were organ-specific (digestive gland > foot > albumen gland = spermoviduct = ovotestis), (3) were species-specific and (4) depended on the metal type (high Cd and Cu concentrations were observed in the digestive gland and foot respectively). Our study emphasizes that background metal levels should be taken into account when using invertebrates as bioindicators of metal contamination and that bioindicators may show substantial differences in accumulation patterns even if they have a highly comparable ecology. - Highlights: ? Concentrations of accumulated metals differ among localities and between the snail species in the foot. ? Organs other than the digestive gland may be involved in the immobilization and detoxification of metals. ? Total metal concentrations and soil physicochemical properties alone are not enough to explain organ bioaccumulation

  1. The genus Plesiophysa, with a redescription of P. ornata (Haas, 1938 (Gastropoda: Planorbidae

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    PARAENSE W. L.

    2002-01-01

    Full Text Available A redescription of conchological and anatomical characters of the planorbid mollusc Plesiophysa ornata (Haas, 1938 is presented, based on topotypic material and specimens from 14 additional localities in the Brazilian states of Rio Grande do Norte, Paraíba, Sergipe, Bahia, Espírito Santo and Minas Gerais. Due to the close similarity of their shells, a sure discrimination of the five species of Plesiophysa described so far (P. pilsbryi, P. granulata, P. guadeloupensis, P. ornata and P. hubendicki is only possible through their anatomical features. The present study points to the high probability of synonymy of P. hubendicki with P. ornata. Investigations on the anatomy of P. pilsbryi and P. guadeloupensis are needed to define their taxonomic relation with the other nominal species.

  2. New localities of four Bulgarian endemic Hydrobiidae species (Mollusca: Gastropoda: Risooidea

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    Dilian Georgiev

    2011-02-01

    Full Text Available New localities of Belgrandiella pussila Angelov, 1959, Belgrandiella angelovi Pintér, 1968, Bythiospeum copiosus (Angelov, 1972, and Grossuana thracica Glöer & Georgiev, 2009 were reported in Bulgaria. Some notes on the generic position of Belgrandiella angelovi and Bythiospeum copiosus were done.

  3. Aquatic Macrophytes as Microhabitats of Radix auricularia (Gastropoda: Pulmonata: A Case Study from Southeast Bulgaria

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    Stanislava Y. Vasileva

    2009-07-01

    Full Text Available The aim of the current study is to investigate the abundance of thefreshwater pulmonate snail Radix auricularia among different aquatic plants communities, with the view of understanding if there is any particular habitat preference, comparing two freshwater basins having similar environmental conditions. The freshwater plant species were collected by net from two ponds at the end of May 2009 - 650 g wet plant mass, micro dam at Chernoochene Village, East Rhodopes Mts.; 138 g wet plant mass, small flood pond near the Maritza River, Plovdiv City, Upper Thracian Lowland. The plant mass was weighted in the laboratory after the alive snails were collected from the plant surface. Totally three species of freshwater plants were inhabited by R. auricularia, but its abundance and possible preference was highest on the Rigid Hornworth (Ceratophyllum demersum.

  4. First record of Grossuana angeltsekovi Glöer & Georgiev, 2009 (Gastropoda: Risooidea from Greece

    Directory of Open Access Journals (Sweden)

    Dilian Georgiev

    2013-02-01

    Full Text Available In this paper it is reported the first finding of a representative of the genus Grossuana from the Greek Rhodopes Mts. – Grossuana angeltsekovi Glöer & Georgiev, 2009 which is and the first record of the species for this country. The locality is a karstic spring, Rodopi county, Papikio Oros, near Vronti (= 4 km N of Kerasia (445 m a.s.l.. The material is stored in the Hungarian Natural History Museum, Budapest.

  5. A new phylogeny of the Cephalaspidea (Gastropoda: Heterobranchia) based on expanded taxon sampling and gene markers.

    Science.gov (United States)

    Oskars, Trond R; Bouchet, Philippe; Malaquias, Manuel António E

    2015-08-01

    The Cephalaspidea is a diverse marine clade of euthyneuran gastropods with many groups still known largely from shells or scant anatomical data. The definition of the group and the relationships between members has been hampered by the difficulty of establishing sound synapomorphies, but the advent of molecular phylogenetics is helping to change significantly this situation. Yet, because of limited taxon sampling and few genetic markers employed in previous studies, many questions about the sister relationships and monophyletic status of several families remained open. In this study 109 species of Cephalaspidea were included covering 100% of traditional family-level diversity (12 families) and 50% of all genera (33 genera). Bayesian and maximum likelihood phylogenetics analyses based on two mitochondrial (COI, 16S rRNA) and two nuclear gene markers (28S rRNA and Histone-3) were used to infer the relationships of Cephalaspidea. The monophyly of the Cephalaspidea was confirmed. The families Cylichnidae, Diaphanidae, Haminoeidae, Philinidae, and Retusidae were found non-monophyletic. This result suggests that the family level taxonomy of the Cephalaspidea warrants a profound revision and several new family and genus names are required to reflect the new phylogenetic hypothesis presented here. We propose a new classification of the Cephalaspidea including five new families (Alacuppidae, Colinatydidae, Colpodaspididae, Mnestiidae, Philinorbidae) and one new genus (Alacuppa). Two family names (Acteocinidae, Laonidae) and two genera (Laona, Philinorbis) are reinstated as valid. An additional lineage with family rank (Philinidae "Clade 4") was unravelled, but no genus and species names are available to reflect the phylogeny and formal description will take place elsewhere. PMID:25916189

  6. Nematopsis gigas n. sp. (Apicomplexa), a parasite of Nerita ascencionis (Gastropoda, Neritidae) from Brazil.

    Science.gov (United States)

    Azevedo, Carlos; Padovan, Isaíras

    2004-01-01

    A new species of Nematopsis (Apicomplexa, Porosporidae) is described from the mantle tissues of the seawater gastropod, Nerita ascencionis (Neritidae), collected in the Atlantic North off the coast of "Fernando de Noronha" Island (3 degrees 47' 57'' S, 32 degrees 25' 12'' W) situated about 350 km from the northeast coast of Brazil. Numerous oocysts, each contained in a parasitophorous vacuole, were found in the cytoplasm of phagocytes in the mantle tissue of the host. The phagocytes were surrounded by a thin wall composed of lucent material. The phagocyte cytoplasm contained a nucleus surrounded by numerous vesicles and some dense masses. The oocysts were 21.9 +/- 0.5 microm long, and 11.5 +/- 0.6 microm wide. The oocyst wall was 0.18-0.25 microm thick, and the apical zone contained a micropyle, 1.0-1.2 microm in diameter, covered by a canopy-like operculum about 0.25 microm thick. Externally, the oocyst wall was surrounded by numerous anastomosing microfibrils attached to the wall and extending towards the periphery of the parasitophorous vacuole. Some microfibrils formed a dense complex network that surrounded the oocyst in the middle of the parasitophorous vacuole, which opened only at the apical zone near the external region of the opercular system. On the basis of the data obtained by light and transmission electron microscopy and host specificity, the gregarine Nematopsis gigas is distinguished from the nearest species as a new species. The taxonomic affinities and morphological comparisons with other similar species of the same genus are discussed. PMID:15134258

  7. Large Differences Over Small Distances: Plasticity in the Shells of Elimia potosiensis (Gastropoda: Pleuroceridae

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    Russell L Minton

    2010-12-01

    Full Text Available Phenotypic plasticity in freshwater mollusks is a well-known phenomenon, occurring in both bivalves and gastropods.  Most work on freshwater snail plasticity has focused either on presence/absence of a single factor, or has looked at responses to environmental gradients over large geographical scales.  Using the pleurocerid snail Elimia potosiensis from a spring and creek in Arkansas, we show a plastic environmental response at a scale thousands of times smaller than was previously known.  Shells of E. potosiensis exhibit plasticity consist with that seen in other pleurocerids over the course of hundreds of meters.  Possible explanations for this small-scale plasticity are offered.

  8. European Lymnaeidae (Mollusca: Gastropoda), intermediate hosts of trematodiases, based on nuclear ribosomal DNA ITS-2 sequences.

    Science.gov (United States)

    Bargues, M D; Vigo, M; Horak, P; Dvorak, J; Patzner, R A; Pointier, J P; Jackiewicz, M; Meier-Brook, C; Mas-Coma, S

    2001-12-01

    Freshwater snails of the family Lymnaeidae are of a great parasitological importance because of the very numerous helminth species they transmit, mainly trematodiases of large medical and veterinary impact. The present knowledge on the genetics of lymnaeids and on their parasite-host inter-relationships is far from being sufficient. The family is immersed in a systematic-taxonomic confusion. The necessity for a tool which enables species distinction and population characterization is evident. This paper aims to review the European Lymnaeidae basing on the second internal transcribed spacer ITS-2 of the nuclear ribosomal DNA. The ITS-2 sequences of 66 populations of 13 European and 1 North American lymnaeid species, including the five generic (or subgeneric) taxa Lymnaea sensu stricto, Stagnicola, Omphiscola, Radix and Galba, have been obtained. The ITS-2 proves to be a useful marker for resolving supraspecific, specific and population relationships in Lymnaeidae. Three different groupings according to their ITS-2 length could be distinguished: Radix and Galba may be considered the oldest taxa (370-406 bp lengths), and Lymnaea s. str., European Stagnicola and Omphiscola (468-491 bp lengths) the most recent, American Stagnicola and Hinkleyia being intermediate (434-450 bp lengths). This hypothesis agrees with the phylogeny of lymnaeids based on palaeontological data, chromosome numbers and radular dentition. ITS-2 sequences present a conserved central region flanked by two variable lateral regions corresponding to the 5' and 3' ends. The number of repeats of two microsatellites found in this conserved central region allows to differentiate Radix from all other lymnaeids. Phylogenetic trees showed four clades: (A) Lymnaea s. str., European Stagnicola and Omphiscola; (B) Radix species; (C) Galba truncatula; and (D) North American stagnicolines. ITS-2 results suggest that retaining Stagnicola as a subgenus of Lymnaea may be the most appropriate and that genus status for Omphiscola is justified. Radix shows a complexity suggesting different evolutionary lines, whereas G. truncatula appears to be very homogeneous. North American and European stagnicolines do not belong to the same supraspecific taxon; the genus Hinkleyia may be used for the American stagnicolines. Genetic distances and sequence differences allowed us to distinguish the upper limit to be expected within a single species and to how different sister species may be. S. palustris, S. fuscus and S. corvus proved to be valid species, but S. turricula may not be considered a species independent from S. palustris. Marked nucleotide divergences and genetic distances detected between different S. fuscus populations may be interpreted as a process of geographic differentiation developping in the present. Among Radix, six valid species could be distinguished: R. auricularia, R. ampla, R. peregra (=R. ovata;=R. balthica), R. labiata, R. lagotis and Radix sp. The information which the ITS-2 marker furnishes is of applied interest concerning the molluscan host specificity of the different trematode species. The phylogenetic trees inferred from the ITS-2 sequences are able to differentiate between lymnaeids transmitting and those non-transmitting fasciolids, as well as between those transmitting F. hepatica and those transmitting F. gigantica. The Fasciola specificity is linked to the two oldest genera which moreover cluster together in the phylogenetic trees, suggesting an origin of the Fasciola ancestors related to the origin of this branch. European Trichobilharzia species causing human dermatitis are transmitted only by lymnaeids of the Radix and Lymnaea s. str.-Stagnicola groups. Results suggest the convenience of reinvestigating compatibility differences after accurate lymnaeid species classification by ITS-2 sequencing. Similarly, ITS-2 sequencing would allow a step forward in the appropriate rearrangement of the actual systematic confusion among echinostomatids. PMID:12798024

  9. The first record of Anisus vorticulus (Troschel, 1834 (Gastropoda: Planorbidae in Croatia?

    Directory of Open Access Journals (Sweden)

    Luboš Beran

    2009-12-01

    Full Text Available A threatened planorbid gastropod Anisus vorticulus (Troschel, 1834, listed in the EU Habitat Directive, was found in the Krka National Park in Croatia in August 2009. This find is the first known record at least in the western part of Croatia belonging to the Adriatic Sea drainage area.

  10. Estudo morfométrico da concha de Lymnaea columella say, 1817 (Mollusca, Gastropoda, Pulmonata

    Directory of Open Access Journals (Sweden)

    Marlene T. Ueta

    1980-12-01

    Full Text Available Foram estudadas variações morfométricas de conchas de L. columella, provenientes de dez criadouros localizados nos seguintes municípios do Estado de São Paulo: - Campinas, Americana, Atibaia, Pirassununga, Caçapava e Taubaté. Foram analisados os diferentes tipos de ambientes onde as limneas são encontradas com maior freqüência, estabelecendo-se a época do ano com maior abundância em espécimes, que correspondeu aos meses de julho a outubro. As medidas nas conhas dos diferentes criadouros referiram-se ao comprimento e largura da concha, comprimento e largura da abertura, comprimento da espira e número de voltas. Foram estabelecidos os coeficientes de correlação e de regressão e realizadas análises de variância entre as medidas tomadas e os índices obtidos da relação entre largura/comprimento da concha. Estas conchas foram comparadas com as de L. columella, L. viator, L. cubensis da coleção do Museu Nacional do Rio de Janeiro. Para a maioria das medidas as conchas mostraram proporções constantes, embora apresentassem diferenças em relação ao desenvolvimento. A maior variação foi observada em relação ao comprimento da espira. As variações morfométricas das conchas foram relacionadas com alguns fatores externos como pH, alcalinidade, dureza e teor da água. Aparentemente apenas a dureza total da água influiu na consistência das conchas.Shells of Lymnaea columella from ten populations from the State of São Paulo were studied to determine morphometric variation. Samples were collected in the following municipalities: Campinas, Americana, Atibaia, Pirassununga, Caçapava and Taubaté. Five measurements were taken from each shell: length and width of the shell, length and width of the aperture and lenght of the spire. Two ratios were also established: width/lenght of the shell and length of the aperture /length of the shell. The numbers of whorls and the length of the shell were also determined. Statistical tests (correlation coeficients, regression, and analysis of variance were used to compare the different samples. Also, com parisons of L. columella shells collected by us were made with those of L. columella, L. viator and L. cubensis from collections deposited in the Museu Nacional, Rio de Janeiro. The results of these studies revealed that in most of the cases the snail populations of different areas were similar, showing constant proportions, but they diverged in their absolute dimensions. Data on aquatic environmental conditions (pH, alkalinity, hardness, and calcium concentration were also obtained. These Chemical factors were examined with respect to shell morphology. Our results revealed that only hardness of water was associated with the robustness of the shells.

  11. On the occurrence of Oxychilus camelinus (Bourguignat, 1852) in Bulgaria (Gastropoda: Zonitidae)

    OpenAIRE

    Dilian Georgiev

    2014-01-01

    Adult shells and living specimens of the terrestrial gastropod Oxychilus camelinus were collected on Rahat Tepe Hill in Plovdiv city, and in Stara Zagora. These records confirm the findings of Hesse (1913) of the occurrence of this species in Bulgaria.

  12. The first record of Anisus vorticulus (Troschel, 1834) (Gastropoda: Planorbidae) in Croatia?

    OpenAIRE

    Luboš Beran

    2009-01-01

    A threatened planorbid gastropod Anisus vorticulus (Troschel, 1834), listed in the EU Habitat Directive, was found in the Krka National Park in Croatia in August 2009. This find is the first known record at least in the western part of Croatia belonging to the Adriatic Sea drainage area.

  13. Morphological variation, biogeography and local extinction of the northern New Zealand landsnail Placostylus hongii (Gastropoda : Bulimulidae)

    International Nuclear Information System (INIS)

    Placostylus hongii (Lesson) is recorded from sites between Whangaroa and Whangarei on the mainland Northland coast, and from the Poor Knights, Chicken, Mokohinau and Great Barrier islands offshore. There is considerable variation in shell morphology between the various populations, commonly with marked morphological divergence at a local scale but with overlapping variation overall across all populations of the taxon. Patterns of morphological variation show no clear geographic trends and are at least in part related to local environmental factors. Correlations are identified between shell shape and substratum type, and between shell size and vegetation type. Placostylus hongii has a very restricted stratigraphic distribution in mainland Northland, with most if not all of the few known fossil populations post-dating Polynesian settlement at c. 900-700 years BP. We suggest that P. hongii populations on the Poor Knights and possibly also those on the Mokohinau islands are endemic, whereas the mainland populations and those on Great Barier and the Chicken islands have originated from anthropic redistribution of snails in prehistoric time. A high proportion of the mainland P. hongii populations and some offshore island populations became extinct in the last few hundred years as a result of predation by introduced mammals and the modification and destruction of shrubland and forest habitat. (author). 54 refs., 9 figs., 1 tabrefs., 9 figs., 1 tab

  14. Revision of the genus Pseudopomatias and its relatives (Gastropoda: Cyclophoroidea: Pupinidae).

    Science.gov (United States)

    Páll-Gergely, Barna; Fehér, Zoltán; Hunyadi, András; Asami, Takahiro

    2015-01-01

    The present paper revises all species that have been assigned to Pseudopomatias Möllendorff, 1885 and Nodopomatias Gude, 1921. The following new species are described: Pseudopomatias abletti Páll-Gergely, n. sp. (northeastern India), Pseudopomatias harli Páll-Gergely, n. sp. (northeastern India), Pseudopomatias linanprietoae Páll-Gergely n. sp. (Laos), Pseudopomatias maasseni Páll-Gergely & Hunyadi, n. sp. (Vietnam and China), Pseudopomatias nitens Páll-Gergely n. sp. (Vietnam), Pseudopomatias prestoni Páll-Gergely, n. sp. (northeastern India), Pseudopomatias reischuetzi Páll-Ger-gely, n. sp. (north-eastern India), Pseudopomatias shanensis Páll-Gergely n. sp. (Myanmar) and Pseudopomatias sophiae Páll-Gergely, n. sp. (Vietnam). Pseudopomatias fulvus is moved to the synonymy of P. amoenus. Csomapupa n. gen. is erected for Pseudopomatias grandis and P. luyorensis. Another new genus, Vargapupa is erected with two species, namely Vargapupa biheli Páll-Gergely, n. sp. (Vietnam) and V. oharai Páll-Gergely, n. sp. (Laos). Both new genera are probably closely related to Pseudopomatias and Nodopomatias. All the currently available type specimens of species in these groups are figured. Anatomical information of P. eos and DNA sequence data of two Pseudopomatias species indicate that the genus is a member of the family Pupinidae. The other pre-existing hypothesis, namely that Pseudopomatias is a member of the Cochlostomatidae, is not supported by our results. PMID:25947459

  15. Four marine digenean parasites of Austrolittorina spp. (Gastropoda: Littorinidae) in New Zealand: morphological and molecular data.

    Czech Academy of Sciences Publication Activity Database

    O'Dwyer, K.; Blasco-Costa, I.; Poulin, R.; Faltýnková, Anna

    2014-01-01

    Ro?. 89, ?. 2 (2014), s. 133-152. ISSN 0165-5752 R&D Projects: GA ?R GBP505/12/G112 Institutional support: RVO:60077344 Keywords : Trematode parasites * life cycles * intertidal ecosystems * phylogenetics analysis * SW Iceland * Notocotylidae * history * snail Subject RIV: EG - Zoology Impact factor: 1.035, year: 2013

  16. The Japanese oyster drill Ocinebrellus inornatus (Récluz, 1851) (Mollusca, Gastropoda, Muricidae), introduced to the Limfjord, Denmark

    DEFF Research Database (Denmark)

    Lützen, JØrgen; Faasse, Marco

    2012-01-01

    The predatory neogastropod Ocinebrellus inornatus was first reported from Europe in W France in 1995 and has since been detected at other sites in NW and N France and The Netherlands. It is native to the North Pacific where it preys on the Pacific oyster Crassostrea gigas. Here we report on the occurrence of the species in beds of European oysters (Ostrea edulis) in the Limfjord, NW Jutland, Denmark. The morphology-based identification has been confirmed by genetic analysis. The species was probably introduced with oysters imported from France in the 1970s and 1980s. The invasion is still relatively localized but as the species has established a reproductive population, it may eventually spread to other parts of the fjord and in time pose a problem to the oyster fishery. The species’ invasion history is reviewed

  17. Four new species and two new records of Odostomiinae (Gastropoda: Pyramidellidae) from Brazil

    Scientific Electronic Library Online (English)

    Alexandre Dias, Pimenta.

    2012-10-01

    Full Text Available Four new species of the pyramidellid Odostomiinae from Brazil are described: Chrysallida conifera sp. nov., characterized by a small and regularly conical shell with prominent nodules; Parthenina biumbilicata sp. nov., characterized by a deep and wide umbilicus and a regularly increasing aperture di [...] ameter at the protoconch, which bears a small circular umbilicus; Eulimastoma franklini sp. nov., which is very similar to Eulimastoma dydima (Verrill & Bush, 1900) but has a prominent helicoid protoconch; Eulimastoma exiguum sp. nov., similar to Eulimastoma weberi (Morrison, 1965) but without spiral ridges. Fargoa diantophila (Wells & Wells, 1961) and Chrysallida nioba (Dall & Bartsch, 1911) are reported from the southwestern Atlantic for the first time.

  18. The First Record of a Marriage Cone, Conus sponsalis (Conidae: Gastropoda from Korea

    Directory of Open Access Journals (Sweden)

    Joong-Ki Park

    2014-01-01

    Full Text Available The Conus Linnaeus, 1758 is a large genus of marine gastropod mollusks belonging to the family Conidae. The Conus species are mostly distributed in the tropical waters of the world, and they are especially abundant in the Indo-West Pacific region. To date, more than 600 species, most of which are predatory species, have been named worldwide in this genus and only six species have been recorded in the Korean waters. Conus sponsalis Hwass in Bruguiere, 1792 was collected from Jeju Island and identified as a new Korean record. In this study, we report a description of the shell morphology of the species.

  19. Venomous mollusks: the risks of human accidents by conus snails (gastropoda: conidae) in Brazil.

    Science.gov (United States)

    Haddad, Vidal; de Paula Neto, João Batista; Cobo, Válter José

    2006-01-01

    Mollusks of the genus Conus present a venomous apparatus composed of radulae, a chitin structure linked to glands, which injects potent neurotoxic peptides, causing serious human envenomation and even death, associated with the blockage of certain receptors and muscular paralysis. No reported envenomation has occurred in Brazil, but certain populations are at risk of accidents. PMID:17160331

  20. The First Record of a Marriage Cone, Conus sponsalis (Conidae: Gastropoda) from Korea

    OpenAIRE

    Joong-Ki Park; Sang-Hwa Lee

    2014-01-01

    The Conus Linnaeus, 1758 is a large genus of marine gastropod mollusks belonging to the family Conidae. The Conus species are mostly distributed in the tropical waters of the world, and they are especially abundant in the Indo-West Pacific region. To date, more than 600 species, most of which are predatory species, have been named worldwide in this genus and only six species have been recorded in the Korean waters. Conus sponsalis Hwass in Bruguiere, 1792 was collected from Jeju I...

  1. Report of a human accident caused by Conus regius (Gastropoda, Conidae).

    Science.gov (United States)

    Haddad, Vidal; Coltro, Marcus; Simone, Luiz Ricardo L

    2009-01-01

    Conus regius is a venomous mollusc in the Conidae family, which includes species responsible for severe or even fatal accidents affecting human beings. This is the first report on a clinical case involving this species. It consisted a puncture in the right hand of a diver who presented paresthesia and movement difficulty in the whole limb. The manifestations disappeared after around twelve hours, without sequelae. PMID:19802483

  2. Response of the Lymnaea peregra (Mollusca: gastropoda) to oil and dispersant

    International Nuclear Information System (INIS)

    The effects of oil polluted water (heavy fuel oil) and a dispersant (Finasol OSR 5) on the behavior of Lymnaea peregra were tested in 4 l aquaria (static test, 96 h, no food added, surface oil slick not removed, water temp. +20 and S 4.5 o/oo). The accumulation of oil in the tissues of the snails was also studied. The activity in oil polluted water low (10 %) compared with the control (30 %). The mortality was 10 % in the oil polluted water and 0 % in the control. In the test with the dispersant (0.01 vol-%), the activity of the snails was 10 % compared with 40 % in the control. The mortality increased from 0 - 20 %. Snails exposed to oil mixtures of 0.1 and 10 vol-% showed increased concentrations of aliphatic and aromatic hydrocarbons in their tissues (4 - 20 times higher than in the control)

  3. Effects of crude oil on the behavior of Lymnaea peregra (Mollusca: gastropoda)

    International Nuclear Information System (INIS)

    The effects of oil polluted water (crude oil) on the behavior of L. pereqra were tested (4 l aquaria, static test, 96 h, no food added, surface slick not removed, water temp. +17 S deg C, S 4 o/oo, 3 parallel test/conc, 10 - 15 ind./aquaria). The activity of the snails was measured 3 times a day by counting the proportion of individuals crawling around within one minute. The activity of the snails was negatively affected in oil solutions of 0.1 to 1.0 vol-%. In the 1 vol-% oil solution the snails were paralysed after being exposed for 24 h and they were unable to crawl around for the next 24 h. The reproduction of the snails (egg laying) was negatively affected by oil. In the excrements of the snails small oil balls could be seen, more in the 0.1 vol-% solution than in the 1 vol-% solution. The mortality was two times higher in the 1 vol-% solution (40 %) than in the control (18 %)

  4. Effect of 60 Co gamma radiation on Biomphalaria Glabrata (Mollusca, Gastropoda) embryos: mortality, malformation and hatching

    International Nuclear Information System (INIS)

    A study was carried out on the radiosensitivity of Biomphalaria glabrata embryos submitted to doses of 5, 10, 15, 20 and 25 Gy of 60 Co during the cleavage, blastula, gastrula, young trochophore and trochophore stages. Mortality, malformation and hatching were the parameters used to evaluate the damage induced by ionizing radiation. Estimated L D50 values (15 days) showed that the cleavage stage (4.3 Gy) was approximately four times more radiosensitive than the trochophore stage (17.0 Gy). Susceptibility to malformation induction was higher in the blastula, gastrula and young trochophore stages. Several types of morphogenetic malformations were observed, such as head malformations, exogastrulas, shell malformations, and embryos with everted stomodeum, with nonspecific malformations being the most frequent. The types of malformation induced by radiation probably are not radiation-specific and do not depend on the dose applied. The dose of 15 Gy was sufficient to greatly reduce the number of hatching snails regardless of the embryonic stage irradiated. We conclude that the effect of 60 Co gamma radiation on B. glabrata embryos presented a specific pattern. (author)

  5. Ovoviviparity and the structure of the brood pouch in Melanoides tuberculata (Gastropoda: Prosobranchia: Thiaridae).

    Science.gov (United States)

    Ben-Ami, Frida; Hodgson, Alan N

    2005-03-01

    The freshwater gastropod Melanoides tuberculata broods its young in a pouch located in the anterodorsal region of the head-foot. The wall of the brood pouch is composed of smooth muscle surrounded by connective tissue. The lumen of the brood pouch is incompletely partitioned by trabeculae, formed by extensions or folds in the chamber wall that are composed of smooth muscle, connective tissue, nonciliated squamous epithelial cells, and some storage cells containing lipid and glycogen. The lumen of the chamber also contains a few cells with storage products. The general absence of secretory cells suggests that embryos derive little nutrition from the mother, and therefore embryonic development is probably ovoviviparous. Embryos in various stages of development were found within brood pouches, with later stage embryos varying in size. There was a negative relationship between embryo size and number of embryos in the brood pouch. PMID:15688449

  6. Relationship Between Imposex and Morphological Variation of the Shell in Nucella lapillus (Gastropoda: Thaididae)

    Science.gov (United States)

    Son, M. H.; Hughes, R. N.

    2000-05-01

    The relationship between imposex and shell morphology of the common dogwhelk, Nucella lapillus, was examined in populations from North Wales. Degree of imposex, morphometry of the shell, habitat-exposure to wave action and substratum type were subjected to multivariate statistical analyses. Shell size increased significantly with increasing degree of imposex. This trend possibly is caused by a diversion of energy allocation from reproduction to shell growth when reproductive effort is blocked or disturbed by imposex.

  7. On Sexual Dimorphism Of Karyotypes Of Viviparus viviparus And V. contectus (Gastropoda, Viviparidae

    Directory of Open Access Journals (Sweden)

    Andriychuk T. V.

    2015-04-01

    Full Text Available Karyotype analysis of males and females of two Viviparid species Viviparus viviparus Linnaeus, 1758 and V. contectus (Millet, 1813, shows differences in their karyotypes in the absence of heteromorphic pairs of chromosomes. This indicates an epigamous mechanism of sex determination.

  8. Actividad molusquicida in vitro de Momordica charantia L. (¨Cundeamor¨ contra Fossaria cubensis (Mollusca: Gastropoda: Lymnaeidae.

    Directory of Open Access Journals (Sweden)

    Diéguez Fernández, L

    2012-05-01

    Full Text Available RESUMENObjetivo: determinar las perspectivas del uso del jugo vegetal extraído de Momordica charantia L. (Cundeamor, en el control de Fossaria cubensis (Pfeiffer, 1839 principal hospedero de Fasciola hepatica en Cuba.ABSTRACTTo determine the perspectives the use of the juice extracted from the Momordica charantia L.

  9. Population biology of the gastropod Olivella minuta (Gastropoda, Olividae) on two sheltered beaches in southeastern Brazil

    Science.gov (United States)

    Petracco, Marcelo; Camargo, Rita Monteiro; Tardelli, Daniel Teixeira; Turra, Alexander

    2014-10-01

    The structure, dynamics and production of two populations of the olivid gastropod Olivella minuta were analyzed through monthly sampling from November 2009 through October 2011 on two sandy beaches, Pernambuco (very sheltered) and Barequeçaba (sheltered) in São Paulo state (23°48'S), southeastern Brazil. On both beaches, samples were taken along five transects established perpendicular to the waterline. Parameters of the von Bertalanffy growth function were estimated for both populations from monthly length-frequency distributions. The production and turnover ratios were determined using the mass-specific growth rate method. The population on the less-sheltered Barequeçaba Beach was less abundant (120.02 ± 22.60 ind m-1) than on Pernambuco Beach (3295.30 ± 504.86 ind m-1 (±SE)), which we attribute to the greater environmental stability of the latter. Conversely, the mean length, size of the largest individual, and body mass were higher at Barequeçaba than at Pernambuco. The significant differences in the growth of individuals and the mortality rate (Z) between the beaches suggest that density-dependent processes were operating at Pernambuco Beach. The production and P/B ratio at Pernambuco (12.12 g AFDM m-1 year-1 and 1.91 year-1) were higher than at Barequeçaba (0.82 g AFDM m-1 year-1 and 1.06 year-1). The difference in production can be attributed to the higher abundance on Pernambuco, while the higher P/B ratio resulted from the scarcity of smaller individuals in the intertidal zone of Barequeçaba. The P/B ratio estimated for the Pernambuco population is the highest found so far for sandy-beach gastropods. This study reinforces the theory that biological interactions are important regulators of sheltered sandy-beach populations. Future studies with multi-beach sampling are needed to better understand the life-history variations of O. minuta along gradients of degree of exposure of sandy beaches.

  10. Belgrandiella bozidarcurcici n. sp., a new species from Bosnia and Herzegovina (Gastropoda: Hydrobiidae

    Directory of Open Access Journals (Sweden)

    Glöer P.

    2014-01-01

    Full Text Available A new hydrobiid snail, Belgrandiella bozidarcurcici n. sp., is described from the rheocrene and rheopsammocrene springs situated in the canyon of the Cvrcka River, a region of Banja Luka, Republic of Srpska, Bosnia and Herzegovina. The concept of the genus Belgrandiella seems to be extremely artificial, but for the time being we keep the new species as a member of the genus based mainly on the shape of the shell of its type species, B. kusceri (Wagner, 1914.

  11. Molecular evidence for the polyphyly of Bostryx (Gastropoda: Bulimulidae) and genetic diversity of Bostryx aguilari

    Scientific Electronic Library Online (English)

    Jorge L., Ramirez; Rina, Ramírez.

    2013-02-01

    Full Text Available Bostryx is largely distributed in Andean Valleys and Lomas formations along the coast of Peru and Chile. One species, Bostryx aguilari, is restricted to Lomas formations located in the Department of Lima (Peru). The use of genetic information has become essential in phylogenetic and population studi [...] es with conservation purposes. Considering the rapid degradation of desert ecosystems, which threatens the survival of vulnerable species, the aim of this study was, first, to resolve evolutionary relationships within Bostryx and to determine the position of Bostryx within the Bulimulidae, and second, to survey the genetic diversity of Bostryx aguilari, a species considered rare. Sequences of the mitochondrial 16S rRNA and nuclear rRNA regions were obtained for 12 and 11 species of Bulimulidae, respectively, including seven species of Bostryx. Sequences of the 16S rRNA gene were obtained for 14 individuals (from four different populations) of Bostryx aguilari. Phylogenetic reconstructions were carried out using Neighbor-Joining, Maximum Parsimony, Maximum Likelihood and Bayesian Inference methods. The monophyly of Bostryx was not supported. In our results, B. solutus (type species of Bostryx) grouped only with B. aguilari, B. conspersus, B. modestus, B. scalariformis and B. sordidus, forming a monophyletic group that is strongly supported in all analyses. In case the taxonomy of Bostryx is reviewed in the future, this group should keep the generic name. Bostryx aguilari was found to have both low genetic diversity and small population size. We recommend that conservation efforts should be increased in Lomas ecosystems to ensure the survival of B. aguilari, and a large number of other rare species restricted to Lomas.

  12. Terrestrial slugs (Gastropoda, Pulmonata in the NATURA 2000 areas of Cyprus island

    Directory of Open Access Journals (Sweden)

    Katerina Vardinoyannis

    2012-03-01

    Full Text Available Terrestrial slugs of the Island of Cyprus were recently studied in the framework of a study of the whole terrestrial malacofauna of the island. The present work was carried out in the Natura 2000 conservation areas of the island in 155 sampling sites over three years (2004–2007. Museum collections as well as literature references were included. In total six species are present in the Natura 2000 areas of the island, belonging to three families: Limacidae, Agriolimacidae and Milacidae. One of the species, Milax riedeli, is a new record for the island. The distribution of the species across the island and in the surrounding areas is discussed.

  13. Present distribution of Potamopyrgus antipodarum (Gray, 1843 (Mollusca: Gastropoda in the Slovak Republic

    Directory of Open Access Journals (Sweden)

    Vladimír Košel

    2008-02-01

    Full Text Available All published and known unpublished data on Potamopyrgus antipodarum (Gray, 1843 from the Slovak Republic are summarised. The Slovak distribution is restricted to the southern parts of the country close to the Danube, Morava, and Hron Rivers. Geographic and vertical distribution is described. The most of the localities are placed between 100 and 140 m a.s.l., the highest situated known record was in 277 m a.s.l. P. antipodarum inhabits slowly flowing rivers and different types of standing waters in Slovakia.

  14. Taxonomic review of Metaxia (Gastropoda: Triphoridae) from Brazil, with description of a new species

    Scientific Electronic Library Online (English)

    Maurício Romulo, Fernandes; Alexandre Dias, Pimenta.

    2011-12-01

    Full Text Available The taxonomy of the species of Metaxia Monterosato, 1884 from Brazil is revised. Previously to this study, only Metaxia excelsa Faber & Moolenbeek, 1991 was known to occur in this country, under its older name Metaxia exilis (C.B. Adams, 1850). The review of a large amount of shells in malacological [...] collections in Brazil revealed the occurrence of three known additional species: Metaxia taeniolata (Dall, 1889); Metaxia rugulosa (C.B. Adams, 1850); Metaxia prompta Rolán & Fernández-Garcés, 2008, all previously reported from the southeast coast of the USA and/or the Caribbean region. Metaxia gongyloskymnus sp. nov., diagnosed by the globose protoconch with continuous axial ribs and microscopic spiral sculpture, is restricted to localities off the Southeastern Brazilian coast.

  15. Vascular supply of the central nervous system of the land snail Megalobulimus oblongus (Gastropoda, Pulmonata

    Directory of Open Access Journals (Sweden)

    H.G. Nóblega

    2003-09-01

    Full Text Available The vascularization of the central nervous system of the snail Megalobulimus oblongus was studied by injection of carmine-gelatin solution into the arterial system and using a histochemical technique for the detection of alkaline phosphatase. The central nervous system of M. oblongus is irrigated by the anterior aorta, from which a series of small branches emerge that supply the subesophageal nervous ganglia. In turn, these branches give rise to a series of smaller vessels that irrigate the buccal bulb, the anterior portion of the foot, the cerebral ganglia, the dorsal body gland, and the anterior portion of the reproductive system. No hemolymph vessels were detected within nervous tissue although such vessels were found in the periganglionic connective sheath. This connective sheath contains vascular loops and had a series of overlaps and projections that follow the contour of the nervous ganglia. This arrangement permits a larger area of interaction between the surface of the nervous tissue and the hemolymph and reduces the distance between the deepest portion of a given ganglion and the hemolymph vessels.

  16. Vascular supply of the central nervous system of the land snail Megalobulimus oblongus (Gastropoda, Pulmonata)

    Scientific Electronic Library Online (English)

    H.G., Nóblega; V., Missaglia; C., Stenert; M.C., Faccioni-Heuser; M., Achaval.

    1247-12-01

    Full Text Available The vascularization of the central nervous system of the snail Megalobulimus oblongus was studied by injection of carmine-gelatin solution into the arterial system and using a histochemical technique for the detection of alkaline phosphatase. The central nervous system of M. oblongus is irrigated by [...] the anterior aorta, from which a series of small branches emerge that supply the subesophageal nervous ganglia. In turn, these branches give rise to a series of smaller vessels that irrigate the buccal bulb, the anterior portion of the foot, the cerebral ganglia, the dorsal body gland, and the anterior portion of the reproductive system. No hemolymph vessels were detected within nervous tissue although such vessels were found in the periganglionic connective sheath. This connective sheath contains vascular loops and had a series of overlaps and projections that follow the contour of the nervous ganglia. This arrangement permits a larger area of interaction between the surface of the nervous tissue and the hemolymph and reduces the distance between the deepest portion of a given ganglion and the hemolymph vessels.

  17. Odontomariinae, a new middle paleozoic subfamily of slit-bearing euophaloidean gastropods (Euophalomorpha, Gastropoda)

    Science.gov (United States)

    Fryda, J.; Heidelberger, D.; Blodgett, R.B.

    2006-01-01

    A new subfamily, the Odontomariinae subfam. nov., is established herein for a distinctive group of uncoiled, slit-bearing Middle Devonian euomphalid gastropods. Its taxonomic position is based on the recent discovery of open coiled protoconchs and it is placed within the Euomphalomorpha. The genera Odontomaria Odontomaria C. F. Roemer and Tubiconcha n. gen. belonging to this new subfamily are enlarged based on studies on new material of the following species: Odontomaria semiplicata (Sandberger & Sandberger), Odontomaria gracilis n. sp., Odontomaria jankei n. sp., Odontomaria cheeneetnukensis n. sp., Odontomaria cindiprellerae n. sp. and Tubiconcha leunissi (Heidelberger, 2001). Members of the Odontomariinae were mainly sedentary organisms in high-energy, moderately shallow water. ?? 2006 E. Schweizerbart'sche Verlagsbuchhandlung.

  18. Physa acuta Draparnaud, 1805 (Gastropoda: Physidae): a study of topotypic specimens

    Scientific Electronic Library Online (English)

    W Lobato, Paraense; Jean-Pierre, Pointier.

    2003-06-01

    Full Text Available A description is given of Physa acuta Draparnaud, 1805, based on topotypic specimens from the Garonne river basin, and additional samples from the environs of the French cities of Montpellier and Perpignan. It proved indistinguishable, in shell and anatomy, from topotypic Physa cubensis Pfeiffer, 18 [...] 39, thus leading the authors to admit the synonymy of the two nominal species under the older name, P. acuta.

  19. Pupilloidea of Pakistan (Gastropoda: Pulmonata): Truncatellininae, Vertigininae, Gastrocoptinae, Pupillinae (in part).

    Czech Academy of Sciences Publication Activity Database

    Pokryszko, B. M.; Auffenberg, K.; Hlavá?, Jaroslav; Naggs, F.

    2009-01-01

    Ro?. 59, ?. 4 (2009), s. 423-458. ISSN 0003-4541 Institutional research plan: CEZ:AV0Z30130516 Keywords : terrestrial snails * pupilloids * Pakistan * new species * Columella * Truncatellina * Boysia * Vertigo * Gastrocopta * Boysidia * Pupilla Subject RIV: EG - Zoology Impact factor: 0.542, year: 2009

  20. Habitat requirements and distribution of Vertigo geyeri (Gastropoda: Pulmonata) in Western Carpathian rich fens.

    Czech Academy of Sciences Publication Activity Database

    Horsák, M.; Hájek, Michal

    2005-01-01

    Ro?. 38, ?. 6 (2005), s. 659-676. ISSN 0022-0019 R&D Projects: GA ?R(CZ) GA206/02/0568; GA AV ?R(CZ) KJB601630501 Institutional research plan: CEZ:AV0Z60050516 Keywords : molluscs * ecology * Contents Subject RIV: EF - Botanics Impact factor: 0.222, year: 2005

  1. Imposex in Olivancillaria vesica vesica (Gmelin) (Gastropoda, Olividae) from a Southeastern Brazilian sandy beach

    Scientific Electronic Library Online (English)

    Carlos Henrique Soares, Caetano; Ricardo Silva, Absalão.

    2002-12-01

    Full Text Available Imposex, the development of male sex organs on the female, is registered and described for Olivancillaria vesica vesica (Gmelin, 1791) at Restinga da Marambaia beach, Rio de Janeiro state, Brazil. [...

  2. Imposex in Olivancillaria vesica vesica (Gmelin (Gastropoda, Olividae from a Southeastern Brazilian sandy beach

    Directory of Open Access Journals (Sweden)

    Carlos Henrique Soares Caetano

    2002-12-01

    Full Text Available Imposex, the development of male sex organs on the female, is registered and described for Olivancillaria vesica vesica (Gmelin, 1791 at Restinga da Marambaia beach, Rio de Janeiro state, Brazil.

  3. The freshwater snails (Gastropoda) of Iran, with descriptions of two new genera and eight new species

    OpenAIRE

    Peter Glöer; Vladimir Pesic

    2012-01-01

    Using published records and original data from recent field work and revision of Iranian material of certain species deposited in the collections of the Natural History Museum Basel, the Zoological Museum Berlin, and Natural History Museum Vienna, a checklist of the freshwater gastropod fauna of Iran was compiled. This checklist contains 73 species from 34 genera and 14 families of freshwater snails; 27 of these species (37%) are endemic to Iran. Two new genera, Kaskakia and Sarkhia, and eigh...

  4. Anesthesia of Biomphalaria spp. (Mollusca, Gastropoda: sodium pentobarbital is the drug of choice

    Directory of Open Access Journals (Sweden)

    RL Martins-Sousa

    2001-04-01

    Full Text Available The anesthetic effect of some water-soluble anesthesic or narcotic drugs currently used in mice was tested in molluscs of the Biomphalaria genus. Sodium thiopental was very toxic to the snails resulting in high rates of mortality in all the treatment schedules tested. Cetamine base, at concentration of 0.25 mg/ml of water, resulted in partial snail anesthesia (40% of snails were anesthetized only after 20 h of exposition. The association of Cetamine base with Tiazine chloridrate did not improve the anesthesic effect, and higher concentrations of these drugs were toxic to the snails. Sodium pentobarbital at 0.4 mg/ml in water for 8 h was the best treatment schedule to anesthetize Biomphalaria snails. In this schedule, the snails were anesthetized without any toxic effect. The procedure provides a powerful tool for in vivo studies that demande a complete state of snail anesthesia.

  5. Size-mass relationships of Melanoides tuberculatus (Thiaridae: Gastropoda) in a eutrophic reservoir

    Scientific Electronic Library Online (English)

    Eduardo Carvalho, Silva; Joseline, Molozzi; Marcos, Callisto.

    2010-10-01

    Full Text Available This study evaluated the relationships of certain allometric measurements in Melanoides tuberculatus Muller, 1774, in order to develop a statistical model to estimate the biomass of this mollusc species. We measured the total length and aperture of 70 shells. These measurements were correlated with [...] the biomass values to construct exponential and power-function models, and both models showed high coefficients of determination. The exponential model was the better biomass predictor, with a coefficient of determination over 93%. These proposed models may be an effective tool to determine the biomass of M. tuberculatus in eutrophic Brazilian reservoirs.

  6. Four new species and two new records of Odostomiinae (Gastropoda: Pyramidellidae from Brazil

    Directory of Open Access Journals (Sweden)

    Alexandre Dias Pimenta

    2012-10-01

    Full Text Available Four new species of the pyramidellid Odostomiinae from Brazil are described: Chrysallida conifera sp. nov., characterized by a small and regularly conical shell with prominent nodules; Parthenina biumbilicata sp. nov., characterized by a deep and wide umbilicus and a regularly increasing aperture diameter at the protoconch, which bears a small circular umbilicus; Eulimastoma franklini sp. nov., which is very similar to Eulimastoma dydima (Verrill & Bush, 1900 but has a prominent helicoid protoconch; Eulimastoma exiguum sp. nov., similar to Eulimastoma weberi (Morrison, 1965 but without spiral ridges. Fargoa diantophila (Wells & Wells, 1961 and Chrysallida nioba (Dall & Bartsch, 1911 are reported from the southwestern Atlantic for the first time.

  7. Four new species and two new records of Odostomiinae (Gastropoda: Pyramidellidae) from Brazil

    OpenAIRE

    Alexandre Dias Pimenta

    2012-01-01

    Four new species of the pyramidellid Odostomiinae from Brazil are described: Chrysallida conifera sp. nov., characterized by a small and regularly conical shell with prominent nodules; Parthenina biumbilicata sp. nov., characterized by a deep and wide umbilicus and a regularly increasing aperture diameter at the protoconch, which bears a small circular umbilicus; Eulimastoma franklini sp. nov., which is very similar to Eulimastoma dydima (Verrill & Bush, 1900) but has a prominent helicoid pro...

  8. Reproductive biology and ecology of Adelomelon brasiliana (Mollusca:Gastropoda) off Buenos Aires, Argentina.

    OpenAIRE

    Cledón , Maximiliano

    2004-01-01

    A. brasiliana is an abundant shallow water volutid distributed from Río de Janeiro, Brazil, to Río Negro, Argentina, SW Atlantic. This species has been commercially exploited in Uruguay by small-scale fishery since the early 90 s. In Argentina is still not systematically exploited. The reproductive biology, and some of the ecologically important aspects of this volutid have been studied at Mar del Plata, Argentina (38° 20 S; 57° 37 W). The reproductive season extends from September to April, ...

  9. Quantification of midkine gene expression in Patella caerulea (Mollusca, Gastropoda) exposed to cadmium

    Science.gov (United States)

    Stillitano, Francesca; Mugelli, Alessandro; Cerbai, Elisabetta; Vanucci, Silvana

    2007-10-01

    The release of cadmium into many coastal areas represents a threat to ecosystems and human health; cadmium is carcinogenic in mammals and in both marine invertebrates and vertebrates. The use of molluscs to assess the ecologic risk associated with contaminants is strongly recommended on account of their ecological role and on their highly conserved control and regulatory pathways that are often homologous to vertebrate systems. We previously identified a midkine family protein in the limpet Patella caerulea; the midkine is a recently discovered cytokines family with unequivocal informative value on repairing injury and neoplastic processes in mammals. Here we report on midkine ( mdk) and ?-tubulin ( ?-tub) gene expression patterns in P. caerulea exposed to cadmium. Limpets, collected on two occasions from a breakwater at a marina (Tyrrhenian Sea) were exposed to sublethal cadmium concentrations (0.5 and 1 mg l -1 Cd) over a 10-day exposure period. RNA was extracted from the viscera of unexposed and exposed specimens. Real time TaqMan RT-PCR was performed to measure the relative mdk and ?-tub gene expression levels. A remarkable mdk over-expression was observed in all exposed animals with respect to unexposed ones; mdk over-expression was significantly higher in both treatments when compared with un-treatment (mean expression levels: 23- and 38-fold, for 0.5 and 1 mg l -1 Cd treatment, respectively; ANOVA, for both P < 0.01). The study also indicates that the mdk up-regulation was significantly Cd-concentration dependent ( P < 0.05). A significant up-regulation of the constitutive ?-tub gene was also observed in 1 mg l -1 Cd-treated animals (mean expression level: 4-fold; ANOVA, P < 0.05). In conclusion, these data provide the first evidence paving the way for the use of the midkine as a promising new biomarker of effect in the environment risk assessment policy.

  10. Limnaea peregrina Clessin, 1882, Synonym of Lymnaea columella Say, 1817 (Gastropoda: Lymnaeidae)

    Scientific Electronic Library Online (English)

    W Lobato, Paraense.

    1994-12-01

    Full Text Available A description is given of the shell, radula, renal region, reproductive system and egg capsules of topotypic specimens of limnaea peregrina Clessin, 1882. This investigation intends contributing to define the specific identity of that nominal species. A close anatomical comparison with Lymnaea colum [...] ella Say, 1817 from Michigan, USA, shows that both forms are indistinguishable, giving support to previous inferences from some authors. Data on egg hatching are presented.

  11. Organ- and species-specific accumulation of metals in two land snail species (Gastropoda, Pulmonata)

    Energy Technology Data Exchange (ETDEWEB)

    Boshoff, Magdalena, E-mail: magdalena.boshoff@ua.ac.be [University of Antwerp, Systemic Physiological and Ecotoxicological Research, Groenenborgerlaan 171, B-2020 Antwerp (Belgium); Jordaens, Kurt [Royal Museum for Central Africa (JEMU), Leuvensesteenweg 13, B-3080 Tervuren (Belgium); University of Antwerp, Evolutionary Ecology Group, Groenenborgerlaan 171, B-2020 Antwerp (Belgium); Backeljau, Thierry [University of Antwerp, Evolutionary Ecology Group, Groenenborgerlaan 171, B-2020 Antwerp (Belgium); Royal Belgian Institute of Natural Sciences (JEMU), Vautierstraat 29, B-1000 Brussels (Belgium); Lettens, Suzanna [Research Institute for Nature and Forest (INBO), Kliniekstraat 25, B-1070 Brussels (Belgium); Tack, Filip [Ghent University, Laboratory of Analytical Chemistry and Applied Ecochemistry, Coupure Links 265, B-9000 Ghent (Belgium); Vandecasteele, Bart [Institute for Agricultural and Fisheries Research (ILVO), Burg van Gansberghelaan 109, B-9820 Merelbeke (Belgium); De Jonge, Maarten; Bervoets, Lieven [University of Antwerp, Systemic Physiological and Ecotoxicological Research, Groenenborgerlaan 171, B-2020 Antwerp (Belgium)

    2013-04-01

    In order to evaluate the usefulness of terrestrial gastropods as bioindicators there is a need for studies that simultaneously compare (1) concentrations of metals in reference and polluted plots, (2) species within the same polluted habitat, (3) metal accumulation patterns in different organs and (4) metal accumulation patterns in relation to soil physicochemical properties. This study aims to assess metal accumulation patterns in two land snail species. Instead of analyzing an organism as a whole, investigating the partitioning of metals in different organs can provide information on the actual toxicological relevant fractions. Therefore, concentrations of Ag, Cd, Cr, Cu, Ni and Zn were examined in five different organs of Cepaea nemoralis, as well as in the foot and the body of Succinea putris. Snails were sampled at four polluted dredged sediment disposal localities and three adjacent less polluted reference plots situated along waterways in Flanders, Belgium. Due to the small size and problematic dissection of S. putris only the concentrations in the foot of both species could be compared. For this reason only, C. nemoralis can be described as a better bioindicator species that allows a far more detailed analysis of organ metal accumulation. This study showed that organs other than the digestive gland may be involved in the immobilization and detoxification of metals. Furthermore, pH, soil fractionation (clay %, silt %, sand %) and organic matter, correlate with metal accumulation in organs. However, most often the soil metal concentrations did not correlate with the concentrations found in snail organs. Metal concentrations in organs of both species (1) differed among polluted plots but rarely between polluted and reference plots within a locality, (2) were organ-specific (digestive gland > foot > albumen gland = spermoviduct = ovotestis), (3) were species-specific and (4) depended on the metal type (high Cd and Cu concentrations were observed in the digestive gland and foot respectively). Our study emphasizes that background metal levels should be taken into account when using invertebrates as bioindicators of metal contamination and that bioindicators may show substantial differences in accumulation patterns even if they have a highly comparable ecology. - Highlights: ? Concentrations of accumulated metals differ among localities and between the snail species in the foot. ? Organs other than the digestive gland may be involved in the immobilization and detoxification of metals. ? Total metal concentrations and soil physicochemical properties alone are not enough to explain organ bioaccumulation.

  12. Record of imposex in Cronia konkanensis (Gastropoda, Muricidae) from Indian waters

    Digital Repository Service at National Institute of Oceanography (India)

    VishwaKiran, Y.; Anil, A.C.

    1999-01-01

    .81% in Stage 4 female snails collected from Marmugao harbour. # 1999 Elsevier Science Ltd. All rights reserved. Keywords: Imposex; Cronia konkanensis; TBT influence; Environmental impact; Ecosystem disturbance 1. Introduction Imposex is a genital disorder.... The relative penis size (RPS) and relative penis length (RPL) indices, include the total length of the penis. The mantle cavity was opened under a binocular microscope by cutting longitudinally through the hypobranchial gland to trace the length of the vas...

  13. Family matters: The first molecular phylogeny of the Onchidorididae Gray, 1827 (Mollusca, Gastropoda, Nudibranchia).

    Science.gov (United States)

    Hallas, Joshua M; Gosliner, Terrence M

    2015-07-01

    Recent investigations into the evolution of the Onchidorididae using morphological based methods have resulted in low support for relationships among genera. This study aims to determine if molecular data corroborates recent morphological interpretations of the evolution of Onchidorididae. Five genetic markers: 16S, 18S, 28S, cytochrome c oxidase 1 (COI) and histone 3 (H3), were sequenced from 32 species comprising Onchidorididae and five other families, three from Phanerobranchia and two from Cryptobranchia. Phylogenies were estimated using maximum likelihood, and Bayesian inference analyses; with both yielding similar topologies. Molecular analyses resulted in high support for the monophyly of the suctorian clade and the placement of the genera within Onchidorididae. However, the Onchidorididae forms a paraphyletic grouping due to the recovery of the Goniodorididae and the Akiodorididae nested within family. In addition, the placement of Corambe as the most derived member of Onchidorididae is contradicted by the present study. Rather it is sister to a large clade that includes Acanthodoris and the species traditionally placed in Onchidoris and Adalaria, now defined as Onchidorididae. We have chosen to maintain Corambidae as a distinct taxon (including Corambe and Loy), sister to Onchidorididae. We also maintain Goniodorididae, Akiodorididae and Calycidoridae (including Calycidoris and Diaphorodoris), which along with the Onchidorididae and Corambidae comprise the suctorian superfamily Onchidoridoidea. Ancestral character reconstruction also suggests that the formation of a gill pocket, a character that currently defines the Cryptobranchia, may have evolved multiple times from an ancestor that lacked the ability to retract its gills into a fully formed gill pocket. The diversity of gill morphology displayed by the Onchidoridoidea will help give new insight into the evolution of this complex character within the Nudibranchia. PMID:25837732

  14. Embryonic Developmental Ecology of Freshwater Snail Lymnaea acuminata (Lymnaeidae: Gastropoda)

    OpenAIRE

    Md. Moniruzzaman Sarker; Badrun Nesa; Md. Sarwar Jahan

    2007-01-01

    The egg type of Lymnaea acuminata was determined as iso-lecithal and the cleavage is spirally holoblastic type. The development of L. acuminata was observed in details. Uncleaved zygote just after laying was found to contain a relatively yolk-free zone, the animal pole and the yolk-rich region, the vegetal pole. No polar bodies were present in eggs examined immediately after they had been laid. The first polar lobe and polar body were extruded out from the zygote within 15-25 min. These were ...

  15. Climate and pH Predict the Potential Range of the Invasive Apple Snail (Pomacea insularum) in the Southeastern United States

    OpenAIRE

    Byers, James E.; Mcdowell, William G.; Dodd, Shelley R.; Haynie, Rebecca S.; Pintor, Lauren M.; Wilde, Susan B.

    2013-01-01

    Predicting the potential range of invasive species is essential for risk assessment, monitoring, and management, and it can also inform us about a species’ overall potential invasiveness. However, modeling the distribution of invasive species that have not reached their equilibrium distribution can be problematic for many predictive approaches. We apply the modeling approach of maximum entropy (MaxEnt) that is effective with incomplete, presence-only datasets to predict the distribution of ...

  16. Comparative study between the effects of hyaluronic acid and acid galactan purified from eggs of the mollusk Pomacea sp in wound healing / Estudo comparativo entre os efeitos do ácido hialurônico e do galactano acídico purificado dos ovos do molusco Pomacea sp na cicatrização de feridas

    Scientific Electronic Library Online (English)

    Ana Katarina Menezes da, Cruz; Wogelsanger Oliveira, Pereira; Elizeu Antunes dos, Santos; Maria Goretti Freire, Carvalho; Aldo da Cunha, Medeiros; Fernanda Wanderley de, Oliveira.

    2004-01-01

    Full Text Available OBJETIVO: Comparar o efeito de ácido hialurônico (AH) e do GA na cicatrização de feridas intestinais. MÉTODOS: O extrato semipurificado dos ovos do molusco foi obtido por fracionamento com sulfato de amônio e purificação por cromatografia de troca-iônica. Os galactanos obtidos foram eluídos em água [...] (galactano neutro) e em 0.1 e 0.2M NaCl (galactanos acídicos). O estudo em vivo foi executado com 45 ratos Wistar, separados em três grupos (n=15). Soluções contendo AH 1%, GA 1% ou solução salina 0,9%, foram aplicadas topicamente nas suturas das feridas longitudinais localizadas no intestino delgado dos ratos. Depois de 05, 10 e 21 dias os animais foram sacrificados e biópsias dos tecidos cicatrizados foram realizadas. RESULTADOS: A graduação histológica foi mais significante para os grupos do AH e GA quando comparado ao grupo C. O GA estimulou o aparecimento de macrófagos, células gigantes e aumentou a concentração de colágeno na área da ferida quando comparado ao AH. CONCLUSÃO: O uso tópico de GA em feridas intestinais promoveu a antecipação de eventos que são importantes na cicatrização de feridas. Abstract in english PURPOSE: To compare the effect of hyaluronic acid (HA) and of AG on the healing of intestine wounds. METHODS: The semi-purified extract of the eggs of the mollusc was obtained by fractionation with ammonium sulfate and purification for ion-exchange chromatography. The obtained galactans were eluted [...] in water (neutral galactan) and in 0.1 and 0.2M NaCl (acidic galactans). The in vivo study was performed with 45 "Wistar" rats, separated in three groups (n=15). Solutions containing HA 1%, GA 1% or saline solution 0,9%, was placed topically on the sutures of wounds in the small intestine of the rats. After 05, 10 and 21 days the animals were sacrificed and biopsy of the healing tissue was done. RESULTS: The hystologic grading was more significant for HA and AG groups when compared to the group C. AG stimulated the appearance of macrophages, giant cells and increase in the concentration of collagen in the area of the wound when compared to HA. CONCLUSION: The topical use of GA in intestinal wounds promoted the anticipation of events that are important in the wound healing.

  17. Novel animal defenses against predation: a snail egg neurotoxin combining lectin and pore-forming chains that resembles plant defense and bacteria attack toxins.

    Science.gov (United States)

    Dreon, Marcos Sebastián; Frassa, María Victoria; Ceolín, Marcelo; Ituarte, Santiago; Qiu, Jian-Wen; Sun, Jin; Fernández, Patricia E; Heras, Horacio

    2013-01-01

    Although most eggs are intensely predated, the aerial egg clutches from the aquatic snail Pomacea canaliculata have only one reported predator due to unparalleled biochemical defenses. These include two storage-proteins: ovorubin that provides a conspicuous (presumably warning) coloration and has antinutritive and antidigestive properties, and PcPV2 a neurotoxin with lethal effect on rodents. We sequenced PcPV2 and studied whether it was able to withstand the gastrointestinal environment and reach circulation of a potential predator. Capacity to resist digestion was assayed using small-angle X-ray scattering (SAXS), fluorescence spectroscopy and simulated gastrointestinal proteolysis. PcPV2 oligomer is antinutritive, withstanding proteinase digestion and displaying structural stability between pH 4.0-10.0. cDNA sequencing and protein domain search showed that its two subunits share homology with membrane attack complex/perforin (MACPF)-like toxins and tachylectin-like lectins, a previously unknown structure that resembles plant Type-2 ribosome-inactivating proteins and bacterial botulinum toxins. The protomer has therefore a novel AB toxin combination of a MACPF-like chain linked by disulfide bonds to a lectin-like chain, indicating a delivery system for the former. This was further supported by observing PcPV2 binding to glycocalix of enterocytes in vivo and in culture, and by its hemaggutinating, but not hemolytic activity, which suggested an interaction with surface oligosaccharides. PcPV2 is able to get into predator's body as evidenced in rats and mice by the presence of circulating antibodies in response to sublethal oral doses. To our knowledge, a lectin-pore-forming toxin has not been reported before, providing the first evidence of a neurotoxic lectin in animals, and a novel function for ancient and widely distributed proteins. The acquisition of this unique neurotoxic/antinutritive/storage protein may confer the eggs a survival advantage, opening new perspectives in the study of the evolution of animal defensive strategies. PMID:23737950

  18. Do climate variables and human density affect Achatina fulica (Bowditch (Gastropoda: Pulmonata shell length, total weight and condition factor? Variáveis ambientais e humanas afetam o comprimento da concha, peso total e fator de condição de Achatina fulica (Gastropoda: Pulmonata?

    Directory of Open Access Journals (Sweden)

    FS. Albuquerque

    2009-08-01

    Full Text Available The length-weight relationship and condition factor have been broadly investigated in snails to obtain the index of physical condition of populations and evaluate habitat quality. Herein, our goal was to describe the best predictors that explain Achatina fulica biometrical parameters and well being in a recently introduced population. From November 2001 to November 2002, monthly snail samples were collected in Lauro de Freitas City, Bahia, Brazil. Shell length and total weight were measured in the laboratory and the potential curve and condition factor were calculated. Five environmental variables were considered: temperature range, mean temperature, humidity, precipitation and human density. Multiple regressions were used to generate models including multiple predictors, via model selection approach, and then ranked with AIC criteria. Partial regressions were used to obtain the separated coefficients of determination of climate and human density models. A total of 1.460 individuals were collected, presenting a shell length range between 4.8 to 102.5 mm (mean: 42.18 mm. The relationship between total length and total weight revealed that Achatina fulica presented a negative allometric growth. Simple regression indicated that humidity has a significant influence on A. fulica total length and weight. Temperature range was the main variable that influenced the condition factor. Multiple regressions showed that climatic and human variables explain a small proportion of the variance in shell length and total weight, but may explain up to 55.7% of the condition factor variance. Consequently, we believe that the well being and biometric parameters of A. fulica can be influenced by climatic and human density factors.A relação peso comprimento e o fator de condição têm sido bastante explorados em pesquisas envolvendo caracóis para obter o índice de condição física em populações e avaliar a condição do habitat. Neste trabalho, nosso objetivo foi descrever que variáveis influenciam os parâmteros biométricos e o bem estar de Achatina fulica em uma recente introdução. De novembro de 2001 a novembro de 2002, amostras mensais desses caracóis foram coletadas na cidade de Lauro de Freitas (Bahia, Brasil. Em seguida, os caracóis foram acondicionados em laboratório e foram obtidos o tamanho da concha e o seu peso. A partir desses dados a curva potencial e o fator de condição foram calculados. Cinco variáveis ambientais foram consideradas: amplitude de temperatura, temperatura média, humidade, precipitação e densidade humana. Regressões múltiplas foram usadas para gerar modelos preditivos através do critério de seleção e logo foram ordenados utilizando o critério de Akaíke. Regressões parciais foram usadas para obter os coeficientes de determinação do clima e fatores humanos. Um total de 1460 indivíduos foram coletados, apresentando uma amplitude de crescimento de concha entre 4,9 a 102,5 mm (média 42,18 mm. A relação entre o crescimento total e o peso revelou que A. fulica apresentou um crescimento alométrico negativo. Regressões simples indicaram que a umidade teve uma influencia significativa sobre o tamanho total e o peso. A amplitude de temperatura foi a variável que mais influenciou o fator de condição. Os modelos de regressão múltipla indicaram que os fatores climáticos e humanos explicaram uma pequena porção da variança, no entanto explicou 55,8% da variância do fator de condição. Consequentemente, acreditamos que o bem estar e os parâmetros biométricos de A. Fulica podem ser influenciados por fatores climáticos e humanos.

  19. Do climate variables and human density affect Achatina fulica (Bowditch) (Gastropoda: Pulmonata) shell length, total weight and condition factor? / Variáveis ambientais e humanas afetam o comprimento da concha, peso total e fator de condição de Achatina fulica (Gastropoda: Pulmonata)?

    Scientific Electronic Library Online (English)

    FS., Albuquerque; MC., Peso-Aguiar; MJT., Assunção-Albuquerque; L., Gálvez.

    2009-08-01

    Full Text Available A relação peso comprimento e o fator de condição têm sido bastante explorados em pesquisas envolvendo caracóis para obter o índice de condição física em populações e avaliar a condição do habitat. Neste trabalho, nosso objetivo foi descrever que variáveis influenciam os parâmteros biométricos e o be [...] m estar de Achatina fulica em uma recente introdução. De novembro de 2001 a novembro de 2002, amostras mensais desses caracóis foram coletadas na cidade de Lauro de Freitas (Bahia), Brasil. Em seguida, os caracóis foram acondicionados em laboratório e foram obtidos o tamanho da concha e o seu peso. A partir desses dados a curva potencial e o fator de condição foram calculados. Cinco variáveis ambientais foram consideradas: amplitude de temperatura, temperatura média, humidade, precipitação e densidade humana. Regressões múltiplas foram usadas para gerar modelos preditivos através do critério de seleção e logo foram ordenados utilizando o critério de Akaíke. Regressões parciais foram usadas para obter os coeficientes de determinação do clima e fatores humanos. Um total de 1460 indivíduos foram coletados, apresentando uma amplitude de crescimento de concha entre 4,9 a 102,5 mm (média 42,18 mm). A relação entre o crescimento total e o peso revelou que A. fulica apresentou um crescimento alométrico negativo. Regressões simples indicaram que a umidade teve uma influencia significativa sobre o tamanho total e o peso. A amplitude de temperatura foi a variável que mais influenciou o fator de condição. Os modelos de regressão múltipla indicaram que os fatores climáticos e humanos explicaram uma pequena porção da variança, no entanto explicou 55,8% da variância do fator de condição. Consequentemente, acreditamos que o bem estar e os parâmetros biométricos de A. Fulica podem ser influenciados por fatores climáticos e humanos. Abstract in english The length-weight relationship and condition factor have been broadly investigated in snails to obtain the index of physical condition of populations and evaluate habitat quality. Herein, our goal was to describe the best predictors that explain Achatina fulica biometrical parameters and well being [...] in a recently introduced population. From November 2001 to November 2002, monthly snail samples were collected in Lauro de Freitas City, Bahia, Brazil. Shell length and total weight were measured in the laboratory and the potential curve and condition factor were calculated. Five environmental variables were considered: temperature range, mean temperature, humidity, precipitation and human density. Multiple regressions were used to generate models including multiple predictors, via model selection approach, and then ranked with AIC criteria. Partial regressions were used to obtain the separated coefficients of determination of climate and human density models. A total of 1.460 individuals were collected, presenting a shell length range between 4.8 to 102.5 mm (mean: 42.18 mm). The relationship between total length and total weight revealed that Achatina fulica presented a negative allometric growth. Simple regression indicated that humidity has a significant influence on A. fulica total length and weight. Temperature range was the main variable that influenced the condition factor. Multiple regressions showed that climatic and human variables explain a small proportion of the variance in shell length and total weight, but may explain up to 55.7% of the condition factor variance. Consequently, we believe that the well being and biometric parameters of A. fulica can be influenced by climatic and human density factors.

  20. Distribution, feeding behavior and control strategies of the exotic land snail Achatina fulica (Gastropoda: Pulmonata) in the northeast of Brazil / Ecologia do caracol exótico Achatina fulica (Gastropoda:Pulmonata) no nordeste do Brasil

    Scientific Electronic Library Online (English)

    FS., Albuquerque; MC., Peso-Aguiar; MJT., Assunção-Albuquerque.

    2008-11-01

    Full Text Available O objetivo deste estudo foi documentar a distribuição e o estabelecimento de Achatina fulica, assim como sua preferência alimentar e aspectos comportamentais in situ. Esta pesquisa foi desenvolvida na cidade de Lauro de Freitas, Estado da Bahia, Brasil, durante os meses de novembro de 2001 a novembr [...] o de 2002. Usamos o método de esforço de captura determinado por homem/hora para calcular a abundância e distribuição, habitats preferidos, além de preferência alimentar. Vimos que a abundância e distribuição de A. fulica foram mais representativas em áreas urbanas, sobretudo cerca da linha de costa. Os terrenos e jardins de casas foram os locais preferidos pelos caracóis quando estavam em atividade. Os resultados indicaram que os caracóis A. fulica iniciam sua atividade no final da tarde e hibernam no meio da manhã. A comida preferida destes caracóis foram plantas vasculares como Hibiscus syriacus, Ricinus Communis, Carica papaya, Galinsonga coccinea, Lippia alba, Ixora coccinea, Musa parasidisiaca, Mentha spicata and Cymbopogon citrates. Nossos dados sugerem que o A. fulica está plenamente adaptado e estabelecido nesta cidade e, também, que ambientes modificados facilitam seu estabelecimento e dispersão. Entretanto, a perturbação humana, como a limpeza de terrenos pode ser um fator limitante para a persistência da população de A. fulica. Abstract in english The goal of this study was to document the distribution and establishment A. fulica such as their feeding preference and behavior in situ. The study was carried out at the city of Lauro de Freitas, Bahia state, Brazil, between November 2001 and November 2002. We used catch per unit effort methods to [...] determine abundance, distribution, habitat choice and food preferences. The abundance and distribution of A. fulica was most representative in urban area, mainly near to the coastline. Lots and house gardens were the most preferred sites during active hours. The results indicated that A. fulica started their activity at the end of the evening and stopped in mid-morning. Their preferred food were vascular plants such as Hibiscus syriacus, Ricinus communis, Carica papaya, Galinsonga coccinea, Lippia alba, Ixora coccinea, Musa parasidisiaca, Mentha spicata and Cymbopogon citrates. Our results indicate that A. fulica are well adapted and established in this city and modified environments facilitate their establishment and dispersion. However, human perturbation, such as clearance of lots could be limiting for the persistence of A. fulica populations.

  1. Melanoides tuberculatus (Gastropoda: Thiaridae as intermediate host of Heterophyidae (Trematoda: Digenea in Rio de Janeiro metropolitan area, Brazil Melanoides tuberculatus (Gastropoda: Thiaridae como hospedeiro intermediário de Heterophyidae (Trematoda: Digenea na região metropolitana do Rio de Janeiro, Brasil

    Directory of Open Access Journals (Sweden)

    Tami Bogéa

    2005-04-01

    Full Text Available In the late 1960s, Melanoides tuberculatus snails were introduced in Brazil from North/East Africa and Southeast Asia. The first records of specimens infected with cercariae were registered in Rio de Janeiro State in 2001. The present study reports the occurrence of M. tuberculatus infected with larval trematodes in Rio de Janeiro City. Bottom sediment was collected with dip nets and sieved through 0.25 inch-mesh screening. Snails were transported to the laboratory in vials with stream water, then measured and individually isolated in glass vials with distilled water. They were exposed to artificial light and temperature to induce cercarial emergence. The most actively emerging cercariae were processed by differential staining and silver nitrate impregnation methods. Negative snails were subsequently dissected. Approximately 700 snails were collected. Snail total lengths ranged from 1.2 to 3.3 cm. The prevalence rate was 15.76% although 53.76% of the snails were found infected in one of the sites. Infected snails were infected with rediae and pleurolophocercous cercariae. Cercarial morphology and chaetotaxy were consistent with those of the family Heterophyidae mostly due to the presence of median dorsal and ventral fins on the tail and the absence of CI dorsal sensory receptors.No final da década de 60, caramujos da espécie Melanoides tuberculatus, originários do nordeste africano e sudeste asiático, foram introduzidos no Brasil. Os primeiros registros de espécimes infectados com cercárias foram feitos no Estado do Rio de Janeiro em 2001. O presente estudo relata a ocorrência de M. tuberculatus infectados com larvas de trematódeos na cidade do Rio de Janeiro. O sedimento dos criadouros foi coletado e peneirado através de malhas de 0,25 polegadas. Os caramujos foram transportados em recipientes com água dos criadouros, sendo medidos e posteriormente individualizados. Eles foram expostos à luz e temperatura artificiais para induzir a emergência cercariana. As cercárias mais ativas foram processadas pelos métodos de coloração diferencial e de impregnação por nitrato de prata. Os caramujos negativos foram subsequentemente dissecados. Aproximadamente 700 caramujos foram coletados. Seu comprimento variou de 1,2 a 3,3 cm. A taxa de prevalência foi de 15,76% apesar de 53,76% dos caramujos estarem infectados em uma das áreas. Os caramujos estavam infectados com rédias e cercárias do tipo pleurolofocerca. A morfologia e a quetotaxia cercarianas foram compatíveis com as da família Heterophyidae principalmente devido à presença de nadadeiras medianas dorsais e ventrais e à ausência de receptores sensoriais CI dorsais.

  2. Melanoides tuberculatus (Gastropoda: Thiaridae) as intermediate host of Heterophyidae (Trematoda: Digenea) in Rio de Janeiro metropolitan area, Brazil / Melanoides tuberculatus (Gastropoda: Thiaridae) como hospedeiro intermediário de Heterophyidae (Trematoda: Digenea) na região metropolitana do Rio de Janeiro, Brasil

    Scientific Electronic Library Online (English)

    Tami, Bogéa; Fernanda Martins, Cordeiro; Janaína Silva de, Gouveia.

    2005-04-01

    Full Text Available No final da década de 60, caramujos da espécie Melanoides tuberculatus, originários do nordeste africano e sudeste asiático, foram introduzidos no Brasil. Os primeiros registros de espécimes infectados com cercárias foram feitos no Estado do Rio de Janeiro em 2001. O presente estudo relata a ocorrên [...] cia de M. tuberculatus infectados com larvas de trematódeos na cidade do Rio de Janeiro. O sedimento dos criadouros foi coletado e peneirado através de malhas de 0,25 polegadas. Os caramujos foram transportados em recipientes com água dos criadouros, sendo medidos e posteriormente individualizados. Eles foram expostos à luz e temperatura artificiais para induzir a emergência cercariana. As cercárias mais ativas foram processadas pelos métodos de coloração diferencial e de impregnação por nitrato de prata. Os caramujos negativos foram subsequentemente dissecados. Aproximadamente 700 caramujos foram coletados. Seu comprimento variou de 1,2 a 3,3 cm. A taxa de prevalência foi de 15,76% apesar de 53,76% dos caramujos estarem infectados em uma das áreas. Os caramujos estavam infectados com rédias e cercárias do tipo pleurolofocerca. A morfologia e a quetotaxia cercarianas foram compatíveis com as da família Heterophyidae principalmente devido à presença de nadadeiras medianas dorsais e ventrais e à ausência de receptores sensoriais CI dorsais. Abstract in english In the late 1960s, Melanoides tuberculatus snails were introduced in Brazil from North/East Africa and Southeast Asia. The first records of specimens infected with cercariae were registered in Rio de Janeiro State in 2001. The present study reports the occurrence of M. tuberculatus infected with lar [...] val trematodes in Rio de Janeiro City. Bottom sediment was collected with dip nets and sieved through 0.25 inch-mesh screening. Snails were transported to the laboratory in vials with stream water, then measured and individually isolated in glass vials with distilled water. They were exposed to artificial light and temperature to induce cercarial emergence. The most actively emerging cercariae were processed by differential staining and silver nitrate impregnation methods. Negative snails were subsequently dissected. Approximately 700 snails were collected. Snail total lengths ranged from 1.2 to 3.3 cm. The prevalence rate was 15.76% although 53.76% of the snails were found infected in one of the sites. Infected snails were infected with rediae and pleurolophocercous cercariae. Cercarial morphology and chaetotaxy were consistent with those of the family Heterophyidae mostly due to the presence of median dorsal and ventral fins on the tail and the absence of CI dorsal sensory receptors.

  3. Microanatomia e histologia do sistema digestivo de Phyllocaulis soleiformis (Orbigny (Mollusca, Gastropoda, Veronicellidae: V. Glândula digestiva Microanatomy and histology of the digestive system of Phyllocaulis soleiformis (Orbigny, 1835 (Mollusca, Gastropoda, Veronicellidae: V. Digestive gland

    Directory of Open Access Journals (Sweden)

    Ana Maria Leal-Zanchet

    1993-01-01

    Full Text Available The digestive gland of Phyllocaulis soleiformis is a compound tubular gland. The secretory tubules are made up of two main cell types: the digestive cells and calcic cells. The digestive cells are the most numerous, usually columnar, and exhibit three different functional stages: absorptive, secretory and excretory. These cells contain two cytoplasmic granules types and, in the excretory stage, most of the cell is occupied by a large vacuole. The calcic cells occursingly or frequently in groups of two or three, are triangular shaped and have distinct apical granules, and yet calcic histochemical detected granules. In addition, there is a third cell type, without characteristic cytoplasmic granules and which correspond to the undifferentiated cells. The excretory duets system are represented by anterior and posterior vestibules, which branche to form the duets, that communicate with the secretory tubules. These excretory duets are lined with a simple epithelium of ciliated columnar cells, followed by a layer of connective tissue with circular and longitudinal muscular fibers. Subepithelial mucous cells are present only in the vestibules.

  4. Microanatomia e histologia do sistema digestivo de Phyllocaulis soleiformis (Orbigny) (Mollusca, Gastropoda, Veronicellidae): V. Glândula digestiva / Microanatomy and histology of the digestive system of Phyllocaulis soleiformis (Orbigny, 1835) (Mollusca, Gastropoda, Veronicellidae): V. Digestive gland

    Scientific Electronic Library Online (English)

    Ana Maria, Leal-Zanchet; José Willibaldo, Thomé; Josef, Hauser.

    Full Text Available [...] Abstract in english The digestive gland of Phyllocaulis soleiformis is a compound tubular gland. The secretory tubules are made up of two main cell types: the digestive cells and calcic cells. The digestive cells are the most numerous, usually columnar, and exhibit three different functional stages: absorptive, secreto [...] ry and excretory. These cells contain two cytoplasmic granules types and, in the excretory stage, most of the cell is occupied by a large vacuole. The calcic cells occursingly or frequently in groups of two or three, are triangular shaped and have distinct apical granules, and yet calcic histochemical detected granules. In addition, there is a third cell type, without characteristic cytoplasmic granules and which correspond to the undifferentiated cells. The excretory duets system are represented by anterior and posterior vestibules, which branche to form the duets, that communicate with the secretory tubules. These excretory duets are lined with a simple epithelium of ciliated columnar cells, followed by a layer of connective tissue with circular and longitudinal muscular fibers. Subepithelial mucous cells are present only in the vestibules.

  5. Microanatomia e histologia do sistema digestivo de Phyllocaulis soleiformis (Orbigny) (Mollusca, Gastropoda, Veronicellidae): V. Glândula digestiva Microanatomy and histology of the digestive system of Phyllocaulis soleiformis (Orbigny, 1835) (Mollusca, Gastropoda, Veronicellidae): V. Digestive gland

    OpenAIRE

    Ana Maria Leal-Zanchet; José Willibaldo Thomé; Josef Hauser

    1993-01-01

    The digestive gland of Phyllocaulis soleiformis is a compound tubular gland. The secretory tubules are made up of two main cell types: the digestive cells and calcic cells. The digestive cells are the most numerous, usually columnar, and exhibit three different functional stages: absorptive, secretory and excretory. These cells contain two cytoplasmic granules types and, in the excretory stage, most of the cell is occupied by a large vacuole. The calcic cells occursingly or frequently in grou...

  6. Avaliação de efeitos de espécies de mangue na distribuição de Melampus coffeus (Gastropoda, Ellobiidae) no Ceará, nordeste do Brasil / Evaluation of local effects of mangrove species on the distribution of Melampus coffeus (Gastropoda, Ellobiidae) in Ceara, northeastern Brazil

    Scientific Electronic Library Online (English)

    Rafaela C., Maia; Marcel O., Tanaka.

    2007-12-01

    Full Text Available Melampus coffeus (Linnaeus, 1758) é um gastrópode pulmonado, macrodetritívoro, importante na transferência de energia em manguezais neotropicais, mas sua distribuição em diferentes escalas espaciais ainda é pouco conhecida nas regiões brasileiras. Assim, o objetivo deste trabalho foi verificar a dis [...] tribuição de M. coffeus com relação: 1) às espécies Rhizophora mangle Rhizophoraceae e Laguncularia racemosa Combretaceae; 2) à posição dos rizóforos de R. mangle e 3) à altura das árvores em diferentes manguezais. O seu comportamento ao longo do ciclo de marés também foi descrito. A densidade de M. coffeus foi similar entre R. mangle e L. racemosa, porém os maiores caramujos foram encontrados nas árvores de R. mangle. A distribuição dos caramujos encontrados no sedimento diferiu em relação aos rizóforos, com maior densidade no centro e o maior tamanho na borda da área amostral. Entretanto, não houve relação com a disponibilidade de recursos alimentares formados por folhas. A densidade também foi maior nos manguezais baixo e médio quando comparados ao alto, porém não foram encontradas diferenças de tamanho dos caramujos em mangues de alturas distintas. Observamos também que, durante a maré alta, M. coffeus sobe nas árvores mais próximas. Estes resultados podem estar relacionados principalmente com a disponibilidade de recursos e abrigos fornecidos por R. mangle. Desta forma, novos estudos sobre a distribuição de M. coffeus sob diversas condições são recomendáveis, já que as regiões de manguezais estão cada vez mais sujeitas a perturbações. Abstract in english Melampus coffeus (Linnaeus, 1758) is a pulmonate, macrodetritivore gastropod, important in energy flows in neotropical mangroves, but its distribution in different spatial scales is still unknown in Brazil. The objective of this study was to evaluate the distribution of M. coffeus: 1) among the mang [...] rove trees Rhizophora mangle Rhizophoraceae and Laguncularia racemosa Combretaceae; 2) in relation to the position of R. mangle prop roots and 3) among mangroves with different tree heights. Further, its behavior along one tidal cycle was also described. The densities of M. coffeus did not differ between R. mangle and L. racemosa, but the largest snails were found on R. mangle. The distribution of snails found on the sediment differed relative to the position of the prop roots, with the highest density in the center and largest size in the edge of the studied areas. However, this distribution was not related with the availability of food resources provided by decayed leaves. Higher densities were also recorded in intermediate and low-stature mangroves when compared with taller ones, but no differences in snail's sizes among mangroves were found. During the high tide, M. coffeus individuals climb nearby trees. These results are possibly related to the availability of resources and shelter supplied by R. mangle. Thus, studies on the distribution of M. coffeus in diverse conditions are essential, because mangroves are being intensively disturbed.

  7. Pteropoda (Gastropoda, Thecosomata e Gymnosomata) coligidos ao largo dos arquipélagos de São Pedro e São Paulo, costa nordeste, Brasil / Pteropoda (Gastropoda, Thecosomata and Gymnosomata) collected along the northeast coast of the archipelago of São Pedro and São Paulo, Brazil

    Scientific Electronic Library Online (English)

    Valdeni Soares de, Oliveira; Maria Eduarda L., Larrazábal.

    2002-07-01

    Full Text Available [...] Abstract in english Pteropoda studies were carried out offshore São Pedro and São Paulo Archipelago (0º56'2"N e 29º20'6"W) to assess biodiversity and spatial distribution. A Bongo net (mesh size 300 micrometer) was hauled obliquely from a depth between 0 and 50 m and Oand 100 m by the REVIZEE-SCORE/NE I oceanographic e [...] xpedition on board of the Brazilian Navy Oceanographic Ship Antares. Samples were collected at 16 stations from September to October 1995. A total of 880 organisms distributed in 20 species, 14 genera and 9 families were identified. At the layer 0-50 m, Creseis virgula (Rang (828) was the most frequent species (71.43%), followed by Limacina inflata (Orbigny, (836) and Cavolinia inflexa (Lesueur, 18(3) (64.28%, each). ln terms of relative abundance outranked L. inflara (varying between 57.5 and 92.24%) and C. virgula (varying between 60.0 and 72.73%). At the layer 0-100 m, C. virgula was very frequent (80%), L. inflata (70%) and Cuvierina columnella (Rang (827) (40%) were frequent, other species had less than 30% of frequency. L. inflata varied from 37.5 to 100% and C. virgula from 42.42 to 100% of relative abundance. Species diversity varied from medium to low (

  8. Pteropoda (Gastropoda, Thecosomata e Gymnosomata coligidos ao largo dos arquipélagos de São Pedro e São Paulo, costa nordeste, Brasil Pteropoda (Gastropoda, Thecosomata and Gymnosomata collected along the northeast coast of the archipelago of São Pedro and São Paulo, Brazil

    Directory of Open Access Journals (Sweden)

    Valdeni Soares de Oliveira

    2002-07-01

    Full Text Available Pteropoda studies were carried out offshore São Pedro and São Paulo Archipelago (0º56'2"N e 29º20'6"W to assess biodiversity and spatial distribution. A Bongo net (mesh size 300 micrometer was hauled obliquely from a depth between 0 and 50 m and Oand 100 m by the REVIZEE-SCORE/NE I oceanographic expedition on board of the Brazilian Navy Oceanographic Ship Antares. Samples were collected at 16 stations from September to October 1995. A total of 880 organisms distributed in 20 species, 14 genera and 9 families were identified. At the layer 0-50 m, Creseis virgula (Rang (828 was the most frequent species (71.43%, followed by Limacina inflata (Orbigny, (836 and Cavolinia inflexa (Lesueur, 18(3 (64.28%, each. ln terms of relative abundance outranked L. inflara (varying between 57.5 and 92.24% and C. virgula (varying between 60.0 and 72.73%. At the layer 0-100 m, C. virgula was very frequent (80%, L. inflata (70% and Cuvierina columnella (Rang (827 (40% were frequent, other species had less than 30% of frequency. L. inflata varied from 37.5 to 100% and C. virgula from 42.42 to 100% of relative abundance. Species diversity varied from medium to low ( < 2.0 bits.ind-1 in both layers. At the layer 0-50 m C. virgula was directly correlated to temperature and salinity, while at the layer 0-100 m L. inflata was correlated to these parameters, showing that these species are Tropical Water indicators.

  9. Malacofauna marinha da região costeira do Canal de São Sebastião, SP, Brasil: Gastropoda, Bivalvia, Polyplacophora e Scaphopoda / A faunal survey of the marine molluscs of the Channel of São Sebastião, SP, Brazil: Gastropoda, Bivalvia, Polyplacophora and Scaphopoda

    Scientific Electronic Library Online (English)

    Alvaro Esteves, Migotto; Cláudio Gonçalves, Tiago; Aimê Rachel Magenta, Magalhães.

    Full Text Available Um levantamento faunístico dos moluscos marinhos do Canal de São Sebastião foi realizado entre junho de 1982 e fevereiro de 1983. Um total de 195 espécies foram encontradas: 103 gastrópodes, 87 bivalves, 4 quitons e 1 escafópodo. 140 espécies pertecem a fauna caribeana, 22 são cosmopolitas ou circun [...] tropicais, 13 são endêmicas da costa brasileira e 10 pertecem à fauna patagônica. A maioria das espécies foi encontrada na região entremarés. São também listadas outras 142 espécies de moluscos registradas por outros autores para a região e não reencontradas. Foi notada uma redução no número de espécies ao se comparar os dados do presente trabalho com dados mais recentes, obtidos por outros autores. Levanta-se a hipótese de que esta situação é devida a poluição crônica e outros impactos ambientais. Abstract in english Between June 1982 and February 1983 a survey of the marine molluscs of the Channel of São Sebastião, State of São Paulo, was carried out A total of 195 species were found: 103 gastropods, 87 bivalves, 4 chitons, and 1 scaphopod. 140 species belong to the Caribbean fauna, 22 are circumtropical or wor [...] ldwide in distribution, 13 are endemic to the Brazilian coast, and 10 belong to the Patagonian fauna. Most species (77,6 %) were found in the intertidal zone. 142 species, recorded for the region by other authors and not found in the present survey, are also listed. A reduction in the number of species was also observed comparing the present data (1982-1983) with more recent data from other authors (1987-1989). This situation is probably due to chronic pollution and other environmental impacts.

  10. Variabilidad geográfica en la tolerancia térmica y economía hídrica del gastrópodo intermareal Nodilittorina peruviana (Gastropoda: Littorinidae, Lamarck, 1822) / Geographic variability in thermal tolerance and water economy of the intertidal gastropod Nodilittorina peruviana. (Gastropoda: Littorinidae, Lamarck, 1822)

    Scientific Electronic Library Online (English)

    JOSE MIGUEL, ROJAS; JOSE MIGUEL, FARIÑA; RUBEN E., SOTO; FRANCISCO, BOZINOVIC.

    2000-09-01

    Full Text Available El gastrópodo Nodilittorina peruviana es un habitante común de la zona intermareal rocosa de la costa norte y centro de Chile. Las poblaciones de esta especie se caracterizan por presentar distribuciones agregadas. Por medio de mediciones de terreno y ensayos de laboratorio se evaluó la influencia d [...] e la agregación sobre las habilidades de termorregulación y conservación de agua, en individuos pertenecientes a dos localidades de la costa de Chile que presentan distintos regímenes termales (Taltal 25º 25' S; 70º 29' W y Las Cruces 33º 35' S; 71º 38' W). Los resultados indican que la influencia de la agregación sobre las habilidades termorregulatorias es dependiente de las condiciones locales. A pesar de que los individuos de ambas localidades presentaron puntos de tolerancia térmica similares, los caracoles de Taltal mostraron tasas de pérdidas de agua menores. El tamaño de las agregaciones se relacionó en forma negativa con la tasa de pérdida de agua de los individuos de ambas localidades. En el caso de Taltal se observó un límite de tolerancia menor que en Las Cruces y una relación positiva entre tamaño de la agregación y temperatura grupal. Los resultados demuestran que las condiciones ambientales locales puede ser determinante para la efectividad de los mecanismos de termorregulación. Abstract in english The gastropod Nodilittorina peruviana inhabit rocky intertidal of the north and center Chile. Populations of this species exhibits aggregated distributions. Through field and lab records we studied the effect of spatial distribution of snails on their thermoregulatory and water conservation efficien [...] cies. We studied individuals from two localities of the Chilean coast with different climatic conditions (Taltal 25° 25 ` S; 70° 29 ` W and Las Cruces 33° 35 ` S; 71° 38 ` W). Results indicate that the influence of spatial distribution thermoregulatory efficiency is dependent of the local conditions. Although individuals from both localities presented similar thermal tolerances, snails from Taltal showed lower rates of water loss. Aggregations size were negatively related with the rate of water loss in individuals from both localities. Only, individuals from Taltal decreased their limit of thermal tolerance, and exhibited a positive relationship between aggregation size and the temperature of the group. Results demonstrated that the local environmental conditions are determinate thermoregulatory strategies.

  11. Conducta de forrajeo del gastrópodo Acanthina monodon Pallas, 1774 (Gastropoda: Muricidae) en el intermareal rocoso de Chile central Foraging behavior of the gastropod Acanthina monodon Pallas, 1774 (Gastropoda: Muricidae) in the intertidal rocky shores of central Chile

    OpenAIRE

    Soto, Rube?n E.; Castilla, Juan C.; FRANCISCO BOZINOVIC

    2004-01-01

    En el presente trabajo investigamos aspectos de la ecología y conducta de forrajeo de Acanthina monodon, un gastrópodo murícido que habita en el intermareal rocoso de Chile central. En terreno, estudiamos las variaciones temporales en su distribución, densidad y dieta. En el laboratorio, cuantificamos la tasa de consumo, las preferencias alimentarias, el tiempo de ingestión y la rentabilidad energética obtenida con distintos tipos de presas mediante experimentos y registros en video. La...

  12. Conducta de forrajeo del gastrópodo Acanthina monodon Pallas, 1774 (Gastropoda: Muricidae en el intermareal rocoso de Chile central Foraging behavior of the gastropod Acanthina monodon Pallas, 1774 (Gastropoda: Muricidae in the intertidal rocky shores of central Chile

    Directory of Open Access Journals (Sweden)

    RUBÉN E. SOTO

    2004-03-01

    Full Text Available En el presente trabajo investigamos aspectos de la ecología y conducta de forrajeo de Acanthina monodon, un gastrópodo murícido que habita en el intermareal rocoso de Chile central. En terreno, estudiamos las variaciones temporales en su distribución, densidad y dieta. En el laboratorio, cuantificamos la tasa de consumo, las preferencias alimentarias, el tiempo de ingestión y la rentabilidad energética obtenida con distintos tipos de presas mediante experimentos y registros en video. Las mayores densidades de individuos de A. monodon fueron observadas en la franja intermareal cercana al nivel cero de marea. En terreno, A. monodon realiza sus actividades de forrajeo principalmente durante la noche y su dieta consistió principalmente de mitílidos (95 % y cirripedios (5 %. La composición de la dieta de A. monodon en terreno presentó variaciones temporales las cuales dependerían principalmente de cambios en la oferta de los distintos tipos de mitílidos presentes en terreno durante los dos años de muestreo. En el laboratorio, los individuos de Acanthina presentaron preferencias alimentarias significativas por el mitílido Semimytilus algosus. En general, A. monodon bajo condiciones de laboratorio presentó una conducta de forrajeo en la cual maximizó la ganancia neta de energía, mediante la selección de las especies y tamaños de presas que le retribuyen la mayor rentabilidad energéticaWe investigated the ecology and foraging behavior of Acanthina monodon, a muricid gastropod that inhabits in the intertidal rocky shores of central Chile. In the field, we studied temporal variation of their spatial distribution, density, and diet composition. While in the laboratory, we quantified the consumption rate, alimentary preferences, ingestion times and energy profitability obtained with different types of prey using experiments and video recording. High densities of A. monodon individuals were observed in the intertidal fringe near at the level tide zero. In the field, A. monodon actively foraged at night preying mainly on mussels (95 % and barnacles (5 %. Temporal variation in diet composition of A. monodon was caused mostly by changes in the cover of different mussel species during the two years of sampling. In the laboratory, individual of A. monodon showed significant preference for the mussel Semimytilus algosus. In these experiments, A. monodon's foraging behavior maximized the net gain of energy by selecting species and sizes of prey that provided the greatest energy profitability

  13. Conducta de forrajeo del gastrópodo Acanthina monodon Pallas, 1774 (Gastropoda: Muricidae) en el intermareal rocoso de Chile central / Foraging behavior of the gastropod Acanthina monodon Pallas, 1774 (Gastropoda: Muricidae) in the intertidal rocky shores of central Chile

    Scientific Electronic Library Online (English)

    RUBÉN E., SOTO; JUAN C., CASTILLA; FRANCISCO, BOZINOVIC.

    2004-03-01

    Full Text Available En el presente trabajo investigamos aspectos de la ecología y conducta de forrajeo de Acanthina monodon, un gastrópodo murícido que habita en el intermareal rocoso de Chile central. En terreno, estudiamos las variaciones temporales en su distribución, densidad y dieta. En el laboratorio, cuantificam [...] os la tasa de consumo, las preferencias alimentarias, el tiempo de ingestión y la rentabilidad energética obtenida con distintos tipos de presas mediante experimentos y registros en video. Las mayores densidades de individuos de A. monodon fueron observadas en la franja intermareal cercana al nivel cero de marea. En terreno, A. monodon realiza sus actividades de forrajeo principalmente durante la noche y su dieta consistió principalmente de mitílidos (95 %) y cirripedios (5 %). La composición de la dieta de A. monodon en terreno presentó variaciones temporales las cuales dependerían principalmente de cambios en la oferta de los distintos tipos de mitílidos presentes en terreno durante los dos años de muestreo. En el laboratorio, los individuos de Acanthina presentaron preferencias alimentarias significativas por el mitílido Semimytilus algosus. En general, A. monodon bajo condiciones de laboratorio presentó una conducta de forrajeo en la cual maximizó la ganancia neta de energía, mediante la selección de las especies y tamaños de presas que le retribuyen la mayor rentabilidad energética Abstract in english We investigated the ecology and foraging behavior of Acanthina monodon, a muricid gastropod that inhabits in the intertidal rocky shores of central Chile. In the field, we studied temporal variation of their spatial distribution, density, and diet composition. While in the laboratory, we quantified [...] the consumption rate, alimentary preferences, ingestion times and energy profitability obtained with different types of prey using experiments and video recording. High densities of A. monodon individuals were observed in the intertidal fringe near at the level tide zero. In the field, A. monodon actively foraged at night preying mainly on mussels (95 %) and barnacles (5 %). Temporal variation in diet composition of A. monodon was caused mostly by changes in the cover of different mussel species during the two years of sampling. In the laboratory, individual of A. monodon showed significant preference for the mussel Semimytilus algosus. In these experiments, A. monodon's foraging behavior maximized the net gain of energy by selecting species and sizes of prey that provided the greatest energy profitability

  14. Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda, Achatinidae) carrier of Helminthes, Protozoa and Bacteria in northeast Venezuela / Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda, Achatinidae) hospedador de helmintos, protozoarios y bacterias en el noreste de Venezuela

    Scientific Electronic Library Online (English)

    Antonio, Morocoima; Valmore, Rodríguez; René, Rivas; Héctor, Coriano; Sigdelis, Rivero; Rosina, Errante; Makeris, Mitchell; Leidi, Herrera; Servio, Urdaneta-Morales.

    2014-12-01

    Full Text Available Por cuanto el molusco Achatina fulica nativo del África es vector de helmintos, pero su relación con protozoarios y bacterias es poco conocida, decidimos estudiar las excretas de 1.200 ejemplares capturados en los estados Anzoátegui, Monagas, Sucre y Nueva Esparta, del noreste de Venezuela. Su moco [...] pedal y heces mostraron infección por los protozoarios Chilomastix spp., Trichomonas spp., Giardia spp., Balantidium spp., Entamoeba spp., Iodamoeba spp., Blastocystis spp. Y por los helmintos de los grupos Ascarioidea, Trichuroidea, Ancylostomatidae y Cestoda. El moco céfalopodal mostró únicamente larvas de Rhabditida. Las bacterias Citrobacter freundii, Escherichia coli, Klebsiella pneumoniae, K. azaenae, Aeromonas hydrophila, Acinetobacter baumannii, Pseudomonas aeruginosa, Campylobacter spp. infectaron a las tres excretas. Los mecanismos de transmisión y la composición de las excretas, como nichos fisiológicamente apropiados para los organismos encontrados, son discutidos en relación con el riesgo epidemiológico que el molusco representa en salud pública y veterinaria. Abstract in english The mollusk Achatina fulica, native to Eastern Equatorial Africa, has been incriminated as a carrier or vector of helminthes. Nevertheless, information in the literature as regards its status as a carrier for bacteria is scarce, and we could find no reference at all for its relation to protozoa. We [...] studied microscopically the excreta from 1200 snails captured in Anzoátegui, Monagas, Sucre and Nueva Esparta states, in northeast Venezuela. The pedal mucus and feces were infected by the protozoa Chilomastix spp., Trichomonas spp., Giardia spp., Balantidium spp., Entamoeba spp., Iodamoeba spp., Blastocystis spp., as well as helminthes of Ascarioidea, Trichuroidea, Ancylostomatidae and Cestoda groups. The only helminthes found in the cephalopodal mucus were Rhabditida larvae. The three excreta were also infected by the bacteria: Citrobacter freundii, Escherichia coli, Klebsiella pneumoniae, K. azaenae, Aeromonas hydrophila, Acinetobacter baumannii, Pseudomonas aeruginosa, Campylobacter spp. Risk of infection and transmission mechanisms as well as the composition of the excreta as appropriate physiological niches for the organisms mentioned, are discussed with regard to the epidemiological importance of this snail for in human and veterinary health.

  15. Anatomía del sistema reproductor femenino y masculino de Sinum cymba (Menke, 1828) (Gastropoda: Naticidae) / Anatomy of the female and male reproductive system of Sinum cymba (Menke, 1828) (Gastropoda: Naticidae)

    Scientific Electronic Library Online (English)

    Alejandra A, Covarrubias; María Soledad, Romero.

    2009-12-01

    Full Text Available Se realiza una descripción mediante microscopía óptica y electrónica del sistema reproductor de Sinum cymba, gasterópodo Naticidae. La anatomía del sistema reproductor de hembras y machos coincide con el patrón descrito en la literatura para otros miembros de esta familia. El sistema reproductor fem [...] enino está formado por un gonoporo, oviducto, bursa copulatrix, receptáculo seminal, glándula de la cápsula, glándula de la albúmina y ovario. Las hembras poseen la capacidad de almacenar espermatozoides en el receptáculo seminal. Se determinó dimorfismo sexual del pie. Contrario a lo esperado, no se registró imposex. El sistema reproductor masculino está formado por el pene que contiene el vaso deferente y una región glandular, la vesícula seminal y el testículo. La organización de las células germinales en los machos de S. cymba difiere del patrón descrito para la mayoría de las especies de gasterópodos marinos y se caracteriza por la ocurrencia de grupos de células estrechamente adheridos a las paredes de los túbulos seminíferos en alguna de las etapas de la espermatogénesis. Esta organización es homogénea en todos los túbulos de la gónada y constante a través del año. Esta distribución intratubular sería un indicador de ciclos gametogénicos de tipo continuo para este grupo de gasterópodos. Abstract in english A description of the reproductive system of Sinum cymba, gastropod Naticidae is revealed by optical and electronic microscopy. The anatomy of the females and males reproductive system agrees with descriptions for other members of this family. The female reproductive system is formed by a gonopore, t [...] he oviduct, a bursa copulatrix, a seminal receptacle, the capsule gland, the albumen gland and the ovary. The female can store sperm in the seminal receptacle. Sexual dimorphism the foot was determined. In opposition of what was expected, no signals of imposex were observed. The male reproductive system is formed by the penis which contains the vas deferens and a gland, the seminal vesicle and the testicle. The organization of germinal cells in males of S. cymba differs from the pattern described for most of the marine gastropod species and it is characterized by the occurrence of cells closely adhered to the walls of the seminiferous tubules in some of the stages of the spermatogenesis. This intratubular distribution is homogenous in all tubules of the gonad and constant through the year. This pattern of intratubular distribution would be an indicator of a continuous gametogenic cycle type for this group of gastropod.

  16. Aspectos ultraestruturais do espermatozóide de Natica marochiensish (Gmelin) (MOllusca, Gastropoda) do litoral norte do Brasil / Ultrastructural aspects of the spermatozoon of Natica marochiensish (Gmelin) (Mollusca, Gastropoda) of the North littoral of Brazil

    Scientific Electronic Library Online (English)

    Edilson, Matos; Patricia, Matos; Graça, Casal; Carlos, Azevedo.

    1997-09-01

    Full Text Available [...] Abstract in english Spermatozoa of Natica marochienssish (Gmelin, 1791) is described by light and electron microscopy. The spermatozoon is of the primitive type with head contains a conical acrosomal complex with an acrosomal vesicle of dense matrix having a basis occupied by the subacrosomal space. The middle piece sh [...] ows the centriolar complex surrounded by mitochondria and the tail contains the axoneme with a 9+2.

  17. Aspectos ultraestruturais do espermatozóide de Natica marochiensish (Gmelin (MOllusca, Gastropoda do litoral norte do Brasil Ultrastructural aspects of the spermatozoon of Natica marochiensish (Gmelin (Mollusca, Gastropoda of the North littoral of Brazil

    Directory of Open Access Journals (Sweden)

    Edilson Matos

    1997-09-01

    Full Text Available Spermatozoa of Natica marochienssish (Gmelin, 1791 is described by light and electron microscopy. The spermatozoon is of the primitive type with head contains a conical acrosomal complex with an acrosomal vesicle of dense matrix having a basis occupied by the subacrosomal space. The middle piece shows the centriolar complex surrounded by mitochondria and the tail contains the axoneme with a 9+2.

  18. Aspectos ultraestruturais do espermatozóide de Natica marochiensish (Gmelin) (MOllusca, Gastropoda) do litoral norte do Brasil Ultrastructural aspects of the spermatozoon of Natica marochiensish (Gmelin) (Mollusca, Gastropoda) of the North littoral of Brazil

    OpenAIRE

    Edilson Matos; Patricia Matos; Graça Casal; Carlos Azevedo

    1997-01-01

    Spermatozoa of Natica marochienssish (Gmelin, 1791) is described by light and electron microscopy. The spermatozoon is of the primitive type with head contains a conical acrosomal complex with an acrosomal vesicle of dense matrix having a basis occupied by the subacrosomal space. The middle piece shows the centriolar complex surrounded by mitochondria and the tail contains the axoneme with a 9+2.

  19. SOBRE LA SINONIMIA ENTRE ARMINA WATTLA MARCUS y MARCUS, 1967 Y ARMINA MUELLERI (IHERING, 1886) (GASTROPODA: NUDIBRANCHIA: ARMINIDAE) / ON THE SYNONYMY BETWEEN ARMINA WATTLA MARCUS AND MARCUS, 1967 AND ARMINA MUELLERI (IHERING, 1886) (GASTROPODA: NUDIBRANCHIA: ARMINIDAE)

    Scientific Electronic Library Online (English)

    Diana P., Báez; Néstor E., Ardila.

    2006-12-01

    Full Text Available [...] Abstract in english Armina wattla Marcus and Marcus, 1967 and Armina abbotti Thompson, Cattaneo and Wong, 1990 were proposed by Ardila and Valdés (2004) to be junior synonyms of Armina muelleri (Ihering, 1886). A detailed anatomical review of these species (radula, reproductive system) and their distribution range reve [...] aled that A. wattla is a valid species and A. abbotti is a synonym of the former. Literature references to Armina tigrina Rafinesque, 1814 in the east coast of North America are misidentifications of some specimens of A. wattla.

  20. Gonad characterization and reproductive cycle of Collisella subrugosa (Orbigny, 1846 (Gastropoda: Acmaeidae in the Northeastern Brazil Caracterização da gônada e ciclo reprodutivo de Collisella subrugosa (Gastropoda: Acmaeidae no Nordeste do Brasil

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    C. A. ROCHA-BARREIRA

    2002-11-01

    Full Text Available Gonad characteristics and reproductive cycle in the acmaeid Collisella subrugosa from Northeastern Brazil were investigated. The individuals were collected monthly from February 1993 to April 1994 at Farol do Mucuripe Beach, Fortaleza, Ceará, Brazil. There is no external characteristic on the shell and the soft body structures except the gonad that allows sex differenciation. The gonad of limpet Collisella subrugosa showned four stages (1 "partially ripe", (2 "ripe", (3 "partially spawned" and (4 "spawned", stages. The reproductive cycle is continous, with the maturation and spawning running parallelly in this population. The temperature was constant during the study period and it did not seem to be important to induce the spawning. The salinity had a weak negative correlation with the spawn process.As características da gônada e o ciclo reprodutivo de uma população de Collisella subrugosa foram estudados. Os indivíduos foram coletados mensalmente de fevereiro de 1993 a abril de 1994, na Praia do Farol do Mucuripe, Fortaleza, Ceará, Brasil. Não foi evidenciada nenhuma característica da concha e de outras estruturas da parte mole que permitisse identificar o sexo dos animais, exceto a gônada. A gônada de Collisella subrugosa apresentou as seguintes fases: (1 "parcialmente madura"; (2 "madura"; (3 "parcialmente esvaziada; e (4 "esvaziada". A reprodução é contínua, com a maturação e a eliminação de gametas ocorrendo paralelamente dentro da população. A temperatura manteve-se constante no período de estudo e não pareceu exercer influência no processo de eliminação dos gametas. A salinidade apresentou correlação negativa fraca no período de desova.

  1. The effects of temperature and oxygen availability on intracapsular development of Acanthina monodon (Gastropoda: Muricidae El efecto de la temperatura y la disponibilidad de oxígeno sobre el desarrollo intracapsular de Acanthina monodon (Gastropoda: Muricidae

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    MIRIAM FERNÁNDEZ

    2006-06-01

    Full Text Available Freshwater and marine organisms show similar models of parental care and are faced with similar constraints to brood, which suggest that comparable environmental limits drive the evolution of parental care in aquatic systems. In fact, the low diffusion coefficient and solubility of oxygen in aquatic environments affect oxygen acquisition and therefore the capacity to aggregate embryos. The effect of other critical environmental variables, such as temperature, is less clear. We assessed the effects of temperature and oxygen availability on (1 the number of developed and undeveloped encapsulated embryos, (2 the proportion of embryos reaching advanced stages during intracapsular development (counting not only developed and undeveloped embryos but also abnormal embryos, (3 asynchrony in development (estimated only in capsules in which development occurred, and (4 final embryo size, as the first step toward identifying the main factors constraining parental care in the ocean. We used the gastropod Acanthina monodon as a model because it has an extended latitudinal range of distribution and exhibits feeding larvae during intracapsular development. The latter factor is relevant because previous studies have suggested that sibling cannibalism could be triggered by intracapsular competition for oxygen. Freshly laid egg capsules were collected and incubated until embryos hatched under different experimental temperatures (7, 11, 15 and 19 °C and oxygen conditions (hypoxia: 50-60 % air saturation; normoxia; and hyperoxia: 150-160 %. More embryos remained in early stages at the end of the experimental period under hypoxia and at the highest experimental temperature. The mean number of developed embryos was significantly lower under hypoxia conditions than under normoxia and hyperoxia, but was not influenced by temperature. However, temperature negatively affected embryo size of developed embryos and the level of asynchrony (number of different developmental stages per capsule. This suggests that even when a comparable number of embryos develops at high temperature, subsequent survival may be affected, since developed embryos attained smaller sizes. The negative effect of high temperature on embryo aggregation has also been reported for Brachyuran crabs, affecting female patterns of oxygen provision and brooding costs. This evidence suggests that aggregating embryos in the ocean, even under optimum oxygen conditions, may be negatively affected at high temperatures. Spatial patterns of distribution of brooding species in the ocean tend to agree with this prediction. Our analysis is particularly relevant given the current increase in temperature and the proportion of anoxic areas in the world's oceansLos organismos marinos y dulceacuícolas muestran modelos similares de cuidado parental y están confrontados con similares restricciones para incubar, lo que sugiere que existen límites ambientales comparables guiando la evolución del cuidado parental en sistemas acuáticos. El bajo coeficiente de difusión y la baja solubilidad del oxígeno en ambientes acuáticos afecta la adquisición de oxígeno y por lo tanto la capacidad para agregar los embriones. El efecto de otras variables ambientales críticas, como la temperatura, es menos claro. Se evaluaron los efectos de la temperatura y la disponibilidad de oxígeno sobre (1 el número de embriones desarrollados y sin desarrollar, (2 la proporción de embriones que alcanza estados avanzados de desarrollo (contabilizando no solo embriones desarrollados y sin desarrollar sino también anormales, (3 la asincronía en el desarrollo (estimada solo cuando ocurrió desarrollo embrionario, y (4 el tamaño final, con el objetivo final de identificar las limitaciones que estos factores imponen sobre el cuidado parental en el mar. La especie modelo fue el gastrópodo Acanthina monodon. Cápsulas recientemente depositadas fueron colectadas e incubadas bajo diferentes condiciones experimentales de temperatura (7, 11, 15 y 19 °C y oxígeno (hipoxia: 50-60 % saturación de aire; no

  2. Distribution, feeding behavior and control strategies of the exotic land snail Achatina fulica (Gastropoda: Pulmonata in the northeast of Brazil Ecologia do caracol exótico Achatina fulica (Gastropoda:Pulmonata no nordeste do Brasil

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    FS. Albuquerque

    2008-11-01

    Full Text Available The goal of this study was to document the distribution and establishment A. fulica such as their feeding preference and behavior in situ. The study was carried out at the city of Lauro de Freitas, Bahia state, Brazil, between November 2001 and November 2002. We used catch per unit effort methods to determine abundance, distribution, habitat choice and food preferences. The abundance and distribution of A. fulica was most representative in urban area, mainly near to the coastline. Lots and house gardens were the most preferred sites during active hours. The results indicated that A. fulica started their activity at the end of the evening and stopped in mid-morning. Their preferred food were vascular plants such as Hibiscus syriacus, Ricinus communis, Carica papaya, Galinsonga coccinea, Lippia alba, Ixora coccinea, Musa parasidisiaca, Mentha spicata and Cymbopogon citrates. Our results indicate that A. fulica are well adapted and established in this city and modified environments facilitate their establishment and dispersion. However, human perturbation, such as clearance of lots could be limiting for the persistence of A. fulica populations.O objetivo deste estudo foi documentar a distribuição e o estabelecimento de Achatina fulica, assim como sua preferência alimentar e aspectos comportamentais in situ. Esta pesquisa foi desenvolvida na cidade de Lauro de Freitas, Estado da Bahia, Brasil, durante os meses de novembro de 2001 a novembro de 2002. Usamos o método de esforço de captura determinado por homem/hora para calcular a abundância e distribuição, habitats preferidos, além de preferência alimentar. Vimos que a abundância e distribuição de A. fulica foram mais representativas em áreas urbanas, sobretudo cerca da linha de costa. Os terrenos e jardins de casas foram os locais preferidos pelos caracóis quando estavam em atividade. Os resultados indicaram que os caracóis A. fulica iniciam sua atividade no final da tarde e hibernam no meio da manhã. A comida preferida destes caracóis foram plantas vasculares como Hibiscus syriacus, Ricinus Communis, Carica papaya, Galinsonga coccinea, Lippia alba, Ixora coccinea, Musa parasidisiaca, Mentha spicata and Cymbopogon citrates. Nossos dados sugerem que o A. fulica está plenamente adaptado e estabelecido nesta cidade e, também, que ambientes modificados facilitam seu estabelecimento e dispersão. Entretanto, a perturbação humana, como a limpeza de terrenos pode ser um fator limitante para a persistência da população de A. fulica.

  3. Population dynamics and reproductive biology of Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda) in Salvador - Bahia / Dinâmica populacional e biologia reprodutiva de Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda) na cidade de Salvador - Bahia

    Scientific Electronic Library Online (English)

    Eder Carvalho da, Silva; Elianne Pessoa, Omena.

    2014-09-02

    Full Text Available Os riscos com a introdução de espécies invasoras são enormes e incalculáveis. Constando como uma das 100 espécies de maior potencial invasor, Achatina fulica se destaca dos demais gastrópodes pulmonados terrestres, principalmente, pelo seu elevado potencial reprodutivo que acelera o processo de disp [...] ersão, aumentando os danos relacionados è saúde (transmissão de doenças), è economia (destruição de cultivos) e ao meio ambiente (perda da biodiversidade). Com o intuito de investigar as relações do caramujo africano com o ambiente, tentando relacionar atividade sexual com variáveis climáticas (temperatura, precipitação e umidade), foi realizado um estudo sobre aspectos da sua dinâmica populacional e biologia reprodutiva na cidade de Salvador. Os caramujos foram coletados manualmente, mensalmente. Dados morfométricos foram obtidos em campo e dissecações para estudo do sistema reprodutivo em laboratório. Para testar se havia uma maior atividade sexual em períodos úmidos foi realizada, inicialmente, uma Análise de Componentes Principais (PCA) com as variáveis climáticas, seguida de uma regressão entre a precipitação (variável ambiental com maior influencia) e a variável de interesse (atividade sexual). Os resultados mostraram que há um aparente ciclo anual para A. fulica, com um período de recrutamento abrangendo o final da estação chuvosa e a estação seca (agosto a dezembro de 2006 e fevereiro de 2007). O aumento do tamanho da concha (altura) e da atividade sexual foi observado durante a estação chuvosa, embora tenham sido encontrados caramujos em plena atividade sexual em todo o período de estudo. A curva de von Bertalanffy mostrou que o exemplar mais velho teria três anos e onze meses. A regressão entre a precipitação e a atividade sexual foi significativa (P = 0,002) mostrando que precipitações mais elevadas aumentam a atividade sexual. Além disso, observou-se que a espessura do perístoma aumenta è medida que o individuo atinge a maturidade sexual, porém esta relação não é precisa (havia indivíduos com estruturas sexuais não consistentes com o estagio reprodutivo dado pela espessura do perístoma) e deve ser ajustada para cada região estudada. Como a erradicação se torna impossível pelos níveis de invasão encontrados em Salvador, é recomendada, para controlar a população de caramujos africanos, a remoção continua de espécimes, especialmente nos períodos de chuva. Abstract in english The risks following introduction of invasive species are enormous and incalculable. Achatina fulica is considered one of the 100 species of greatest invasive potential, stands out among the land pulmonate snails, mostly for its high reproductive potential that accelerates the process of dispersion, [...] increasing the damages related to health (disease transmission), to economy (crops destruction) and to environment (biodiversity loss). In order to investigate the relationship of the African snail with the environment, trying to relate sexual activity with climatic variables (temperature, rainfall and humidity), a study was conducted on aspects of population dynamics and reproductive biology in Salvador city. The snails were collected by hand, monthly. Morphometric data were obtained in the field and dissections to analyze the reproductive system at laboratory. To test if there was a greater sexual activity in wet periods was performed first a Principal Component Analysis (PCA) with climatic variables, followed by a regression between precipitation (the most influential environmental variable) and the variable of interest (sexual activity). The results showed that there is an apparent annual cycle for A. fulica, with a recruitment period covering the end of rainy season and the dry season (August to December 2006 and February 2007). Increase of shell size (height) and of sexual activity were observed during the rainy season, although snails were found in full sexual activity during the whole period of study. The von Bertalanffy curve showed that

  4. Characterization of the geographical distribution pattern of the family Limacinidae Gray, 1840 (Mollusca - Gastropoda) in the waters of Northeastern of Brazil / Caracterização do padrão de distribuição geográfica da família Limacinidae Gray, 1840 (Mollusca - Gastropoda) nas águas do Nordeste brasileiro

    Scientific Electronic Library Online (English)

    Valdeni Soares de Oliveira, Koblitz; Maria Eduarda de L., Larrazábal.

    2014-04-23

    Full Text Available A distribuição geográfica da família Limacinidae na costa do Nordeste brasileiro, foi analisada levando em consideração os aspectos ecológicos mais relevantes, objetivando a ampliação do conhecimento sobre a família. O material foi coletado durante a IV Expedição Oceanográfica do Programa REVIZEE (A [...] valiação do Potencial Sustentável de Recursos Vivos da Zona Econômica Exclusiva), nos meses de setembro a dezembro de 2000. A área estudada está localizada entre 00°46’45”N a 13°53’45”S - 29°15’40”W a 39°49’42”W, onde foram realizados seis cruzeiros, totalizando 123 estações. As amostras foram coletadas em rede tipo bongo (malhas coletoras de 300 e 500 µm, com aros de 60 cm de diâmetro) acopladas com fluxômetro digital, em arrastos oblíquos na profundidade de 0 a 200 m. Foram considerados os organismos retidos na malha de 300 µm. A bordo, as amostras foram acondicionadas em recipientes plásticos, etiquetadas e fixadas em formaldeído a 4%, tamponado com tetraborato de sódio. Em laboratório, as amostras foram analisadas em placa do tipo “Bogorov”, sob estereomicroscópio binocular. Foram examinados 5655 indivíduos da família Limacinidae, assim distribuídos: 03 gêneros e 05 espécies. Os representantes da família Limacinidae ocorreram em altas temperaturas e salinidades, caracterizando-se, assim, como tropicais e euhalinos. Heliconoides inflatus sobressaiu em abundância e frequência. Limacina lesueurii mostrou-se uma espécie rara e pouco frequente. Limacina trochiformis e L. bulimoides foram pouco abundantes e pouco frequentes. Limacina lesueurii e L. bulimoides foram registradas como primeira ocorrência em águas neríticas, sendo este o primeiro registro de L. lesueurii para as águas do Nordeste brasileiro. Limacina trochiformis e L. bulimoides tiveram ampla distribuição, apesar de pouco frequentes e pouco abundantes. A distribuição de Thielea helicoides restringiu-se às águas oceânicas. Foi observada uma correlação entre Limacina bulimoides, Heliconoides inflatus, Thielea helicoides e L. lesueurii por coexistirem no mesmo nicho. Abstract in english The geographical distribution of the family Limacinidae in the Northeastern coast of Brazil was analyzed by taking into account the most relevant ecological aspects, aiming to increase the knowledge about the Family. The material was collected during the 4th Oceanographic Expedition of the REVIZEE p [...] rogram (Assessment of the Sustainable Potential of Living Resources in the Exclusive Economic Zone - Avaliação do Potencial Sustentável de Recursos Vivos da Zona Econômica Exclusiva), in the months from September to December 2000. The studied area is located between 00°46’45”N and 13°53’45”S and between 29°15’40”W and 39°49’42”W, where six trips were performed, totaling 123 stations. The samples were collected using a bongo net (300- and 500-µm mesh size and net mouths of 60 cm in diameter) coupled with a digital flowmeter in oblique hauls from a depth of 0 to 200 m. For this study, the organisms retained in the 300-µm mesh were considered. On board the ship, the samples were placed in plastic containers, labeled, and fixed in 4% formaldehyde buffered with sodium tetraborate. In the laboratory, the samples were analyzed on a “Bogorov” tray under a binocular stereomicroscope. A total of 5655 individuals of the family Limacinidae were examined and were distributed as follows: 3 genera and 5 species. Representatives of the family Limacinidae were observed at high temperatures and salinities and were thus characterized as tropical and euhaline. Heliconoides inflatus was the species with the greatest abundance and frequency. Limacina lesueurii proved to be a rare, infrequently observed species. Limacina trochiformis and L. bulimoides were not abundant or frequent. Limacina lesueurii and L. bulimoides were recorded in neritic waters for the first time; this was also the first record of L. lesueurii in the waters of Northeastern Brazil. Limacina trochiformis an

  5. Os gêneros Fasciolaria Lamarck, 1799 e Leucozonia Gray, 1847 no nordeste brasileiro (Mollusca: Gastropoda: Fasciolariidae The genera Fasciolaria Lamarck, 1799 and Leucozonia Gray, 1847 in the northeastern Brazil (Mollusca: Gastropoda: Fasciolariidae

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    Helena Matthews-Cascon

    1989-01-01

    Full Text Available The genera Fasciolaria Lamarck, 1799 and Leucozonia Gray, 1847 are represented in Northeastern Brazil by three species. Fasciolaria aurantiaca Lamarck, 1816; Leucozonia ocellata (Gmelin, 1791 and Leucozonia nassa (Gmelin, 1791. The three species are described and illustrated. An identification key for all the above mentioned taxa is included, together with some ecological data. The anatomy and radula of Fasciolaria aurantiaca and Leucozonia nassa are described and illustrated. Polimorfism in Fasciolaria aurantiaca and Leucozonia nassa is discussed.

  6. Primer reporte de infección natural de Galba cubensis (Mollusca: Gastropoda: Lymnaeidae) con larvas de Paramphistomidae (Trematoda: Digenea) en Cuba / First report on Galba cubensis (Mollusca: Gastropoda: Lymnaeidae) naturally infected with larvae of Paramphistomidae (Trematoda: Digenea) in Cuba

    Scientific Electronic Library Online (English)

    Antonio A, Vázquez Perera; Jorge, Sánchez Noda; Annia, Alba Menéndez; Eolian, Rodríguez Vara; Adonis, Pino Santos.

    2013-09-01

    Full Text Available Introducción: los estudios acerca de las especies de trematodos digeneos que existen en Cuba son escasos y vinculados fundamentalmente a aquellas especies que provocan enfermedades parasitarias importantes en el humano. A esto se añade el hecho de que el hospedero intermediario es desconocido para m [...] uchos de los trematodos existentes. En particular, 8 especies de Paramphistomatidae se han reportado en Cuba; aunque no se conocen, hasta el momento, las especies de moluscos involucradas en la transmisión de esta familia de parásitos. Objetivo: reportar la infección natural en el molusco Galba cubensis con larvas de trematodos. Métodos: se colectaron moluscos fluviales de forma manual en condiciones naturales en la localidad La Coca. Los individuos se colocaron en los laboratorios de malacología hasta la emisión de cercarias. La identificación de las formas larvarias se realizó por medio de claves morfológicas para trematodos. Resultados: en este reporte se informa, por primera vez en Cuba, al caracol Galba cubensis infectado de forma natural con paramfistómidos. Conclusiones: las características ecológicas de Galba cubensis, así como su preferencia de hábitat, en Cuba podrían contribuir a la transmisión de paramfistómidos. Abstract in english Introduction: studies on digenean trematode species living in Cuba are scarce and mainly focused on species causing major parasitic diseases in humans. Moreover, the intermediary host for many of the trematodes has not been found. Eight species of Paramphistomatidae have been reported in Cuba, but t [...] he mollusk species involved in transmission of this parasite family are still unknown. Objective: report natural infection of the mollusk Galba cubensis with trematode larvae. Methods: fluvial mollusks were collected manually under natural conditions in the area of La Coca. Individuals were kept in malacology laboratories until cercariae were issued. Identification of larval forms was based on morphological keys for trematodes. Results: in this report the snail Galba cubensis is reported for the first time in Cuba as naturally infected with paramphistomids. Conclusions: the ecological characteristics of Galba cubensis, as well as its habitat preferences in Cuba could contribute to the transmission of paramphistomids on the island.

  7. Review of the geographic distribution of Hoffmannola hansi (Gastropoda: Pulmonata) in the Mexican Pacific / Revisión del ámbito de distribución geográfica de Hoffmannola hansi (Gastropoda: Pulmonata) en el Pacífico mexicano

    Scientific Electronic Library Online (English)

    Omar Hernando, Avila-Poveda; Quetzalli Yasú, Abadia-Chanona; Raúl, Herrera-Fragoso; Benoît, Dayrat.

    Full Text Available Hoffmannola hansi (babosa de cuero intermareal mexicana) es tradicionalmente registrada como una especie endémica del golfo de California, México. Sin embargo, su presencia en el sur del Pacífico mexicano ha sido mencionada en listas de control y en informes regionales. Ofrecemos nuevos registros de [...] poblaciones de H. hansi de al menos 3 localidades de Oaxaca, México. Las características anatómicas que ayudan a identificar a H. Hansi se describen para ejemplares vivos y conservados. Se mencionan los ejemplares desde el golfo de California hasta Oaxaca, México, proporcionando una distribución ampliada a lo largo del Pacífico mexicano. Un mapa con la distribución geográfica de H. Hansi también se actualiza. Por lo tanto, esta especie no es endémica del golfo de California, sino que está bien distribuida en el Pacífico mexicano. Sin embargo, su distribución es discontinua, con la posible existencia de 2 especies crípticas geográficamente separadas por la brecha sinaloense: una en el Norte (golfo de California) y otra en el Sur. Sigue siendo necesario realizar trabajo adicional para explorar en mayor detalle la distribución geográfica completa de las poblaciones de H. hansi en toda la costa del Pacífico mexicano. Abstract in english Hoffmannola hansi (Mexican intertidal leather slug) is traditionally reported as an endemic species to the Gulf of California, Mexico. However, its presence in the southern Mexican Pacific has been mentioned in regional checklists and reports. Here we provide new records of H. hansi populations from [...] at least 3 locations from Oaxaca, Mexico. The anatomical characteristics useful for H. hansi identification are described for both, living and preserved specimens. Specimen's reports from the Gulf of California to Oaxaca, Mexico, are mentioned, yielding a revised distribution throughout the Mexican Pacific. A map with the wider geographic distribution of H. hansi is also updated. Therefore, this species is not "endemic" to the Gulf of California, but is distributed throughout the Mexican Pacific. However its distribution is discontinuous with the possible existence of 2 cryptic species geographically separated by the Sinaloan gap: 1 in the North (Gulf of California) and 1 in the South. Additional work is needed to explore in more detail the complete geographical range of H. hansi populations on the entire Mexican Pacific Coast.

  8. Moluscos de importância econômica no Brasil: III. Subulinidae, Leptinaria unilamellata (Orbigny) (Mollusca, Gastropoda, Pulmonata, Stylommatophora) Molluscs of economic importance in Brasil: III. Subulinidae, Leptinaria unilamellata (Orbigny) (Mollusca, Gastropoda, Pulmonata, Stylommatophora)

    OpenAIRE

    José Luiz de B. Araújo; Darli Grativol Keller

    1993-01-01

    An anatomic study of Leptinaria unilamellata (Orbigny, 1835) was made emphasizing the genital system, the pallial chamber the radulae and the mandible. The details of these parts characterize better the species and allow more systematic clarity to the group. The importance of the evolutive cycle of the two trematodes, Postharmostomum gallinum (Witenberg, 1923) and Paratanaisia bragai (Santos, 1934) both parasites of domestic birds in Brazil is accentuated.

  9. Moluscos de importância econômica no Brasil: III. Subulinidae, Leptinaria unilamellata (Orbigny) (Mollusca, Gastropoda, Pulmonata, Stylommatophora) / Molluscs of economic importance in Brasil: III. Subulinidae, Leptinaria unilamellata (Orbigny) (Mollusca, Gastropoda, Pulmonata, Stylommatophora)

    Scientific Electronic Library Online (English)

    José Luiz de B., Araújo; Darli Grativol, Keller.

    Full Text Available [...] Abstract in english An anatomic study of Leptinaria unilamellata (Orbigny, 1835) was made emphasizing the genital system, the pallial chamber the radulae and the mandible. The details of these parts characterize better the species and allow more systematic clarity to the group. The importance of the evolutive cycle of [...] the two trematodes, Postharmostomum gallinum (Witenberg, 1923) and Paratanaisia bragai (Santos, 1934) both parasites of domestic birds in Brazil is accentuated.

  10. Moluscos de importância econômica no Brasil: III. Subulinidae, Leptinaria unilamellata (Orbigny (Mollusca, Gastropoda, Pulmonata, Stylommatophora Molluscs of economic importance in Brasil: III. Subulinidae, Leptinaria unilamellata (Orbigny (Mollusca, Gastropoda, Pulmonata, Stylommatophora

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    José Luiz de B. Araújo

    1993-01-01

    Full Text Available An anatomic study of Leptinaria unilamellata (Orbigny, 1835 was made emphasizing the genital system, the pallial chamber the radulae and the mandible. The details of these parts characterize better the species and allow more systematic clarity to the group. The importance of the evolutive cycle of the two trematodes, Postharmostomum gallinum (Witenberg, 1923 and Paratanaisia bragai (Santos, 1934 both parasites of domestic birds in Brazil is accentuated.

  11. Arion intermedius (Gastropoda: Stylommatophora: first record of this introduced slug in Chile, with notes on its anatomy and natural history Arion intermedius (Gastropoda: Stylommatophora: primer registro de esta babosa introducida en Chile, con notas sobre su anatomía e historia natural

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    FRANCISCO J CÁDIZ

    2007-03-01

    Full Text Available Results and conclusions are presented on morphological and field observations made on a collection of land slugs from the Arboretum and Botanical Garden administered by the Universidad Austral de Chile at Valdivia, as well as various records from other collection sites in southern Chile. Based on some anatomical features, the individuals studied were identified as Arion intermedius Normand, 1852, endemic to eastern Europe, and known from various locations around the world for its invasive capacity, apparently facilitated by its feeding habits and particularly by its reproductive strategy of strict self fertilization which is unusual in pulmonates. This is the first report of this species, introduced to Chile by human activities, added to previous literature citing the presence of Limacidae, Agriolimacidae, and Helicidae. This slug is a potential threat to agriculture and to native flora and fauna of ChileSe entregan los resultados y conclusiones de las observaciones anatómicas y de campo realizadas sobre un grupo de babosas terrestres capturadas principalmente en el parque Arboretum y Jardín Botánico de la Universidad Austral de Chile, en la ciudad de Valdivia, además de sus hallazgos puntuales en otros puntos del sur de Chile. Los ejemplares analizados corresponden a Arion intermedius Normand, 1852, especie endémica del este de Europa conocida en diversos lugares del mundo por su alta capacidad de colonización e invasión, ello aparentemente facilitado por su hábito de alimentación y particularmente su inusual estrategia reproductiva dentro de los pulmonados (autofecundación estricta. De esta manera, registramos una nueva especie introducida antrópicamente en Chile, sumándose de esta forma la familia Arionidae a las ya conocidas Limacidae, Agriolimacidae y Helicidae como una potencial amenaza a la agricultura y a la flora y fauna nativas chilenas

  12. Arion intermedius (Gastropoda: Stylommatophora): first record of this introduced slug in Chile, with notes on its anatomy and natural history / Arion intermedius (Gastropoda: Stylommatophora): primer registro de esta babosa introducida en Chile, con notas sobre su anatomía e historia natural

    Scientific Electronic Library Online (English)

    FRANCISCO J, CÁDIZ; CARLOS S, GALLARDO.

    2007-03-01

    Full Text Available Se entregan los resultados y conclusiones de las observaciones anatómicas y de campo realizadas sobre un grupo de babosas terrestres capturadas principalmente en el parque Arboretum y Jardín Botánico de la Universidad Austral de Chile, en la ciudad de Valdivia, además de sus hallazgos puntuales en o [...] tros puntos del sur de Chile. Los ejemplares analizados corresponden a Arion intermedius Normand, 1852, especie endémica del este de Europa conocida en diversos lugares del mundo por su alta capacidad de colonización e invasión, ello aparentemente facilitado por su hábito de alimentación y particularmente su inusual estrategia reproductiva dentro de los pulmonados (autofecundación estricta). De esta manera, registramos una nueva especie introducida antrópicamente en Chile, sumándose de esta forma la familia Arionidae a las ya conocidas Limacidae, Agriolimacidae y Helicidae como una potencial amenaza a la agricultura y a la flora y fauna nativas chilenas Abstract in english Results and conclusions are presented on morphological and field observations made on a collection of land slugs from the Arboretum and Botanical Garden administered by the Universidad Austral de Chile at Valdivia, as well as various records from other collection sites in southern Chile. Based on so [...] me anatomical features, the individuals studied were identified as Arion intermedius Normand, 1852, endemic to eastern Europe, and known from various locations around the world for its invasive capacity, apparently facilitated by its feeding habits and particularly by its reproductive strategy of strict self fertilization which is unusual in pulmonates. This is the first report of this species, introduced to Chile by human activities, added to previous literature citing the presence of Limacidae, Agriolimacidae, and Helicidae. This slug is a potential threat to agriculture and to native flora and fauna of Chile

  13. Estudo quantitativo de metais presentes na hemolinfa de Biomphalaria glabrata (Gastropoda, infectadas e não infectadas com Schistosoma mansoni Quantitative study of metal present in the hemolymph of Biomphalaria glabrata (Gastropoda, infected and uninfected with Schistosoma mansoni

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    Marco Antonio Vasconcelos Santos

    2005-04-01

    Full Text Available Inicialmente, desenvolveu-se um estudo para quantificar e comparar as concentrações de alguns metais presentes em duas amostras de hemolinfa do caramujo Biomphalaria glabrata (infectados e não-infectados com Schistosoma mansoni. A espectrometria de emissão óptica com fonte de plasma induzido (ICP-OES, foi utilizada para analisar os metais nas duas amostras. Os metais estudados foram: alumínio, cálcio, cádmio, cobalto, cromo, cobre, ferro, potássio, magnésio, manganês, chumbo e zinco. Os resultados mostram que, a princípio, os metais não são fatores determinantes no processo de defesa desses organismos contra este parasita, quando presente nos seus tecidos.We conducted a preliminary study to quantify and compare two concentrations of the same metals present in the hemolymph of snail Biomphalaria glabrata. In this context, we used Induction Coupled Plasma Optical Emission Spectroscopy technique (ICP-OES, to analyze the metals in the two samples (snails infected and not infected with Schistosoma mansoni. The metals studied were: aluminum, calcium, cadmium, cobalt, chromium, copper, iron, potassium, magnesium, manganese, lead and zinc. Preliminary results showed that such metals are not involved in the defense of these organisms against the parasite, when present in their tissues.

  14. MOLUSCOS TERRESTRES DE CHILE. SINONIMIA Y PROBLEMAS RELACIONADOS: 1. FAMILIAS VERONICELLIDAE, PIPILLIDAE Y ACHATINELLIDAE (GASTROPODA: PULMONATA) / LAND MOLLUSCA OF CHILE. SYNONYMIES AND RELATES PROBLEMS: 1. FFAMILIES VERONICELLIDAE, PIPILLIDAE Y ACHATINELLIDAE (GASTROPODA: PULMONATA)

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    José R., Stuardo; Patricio, Vargas-Almonacid.

    Full Text Available Se examina el status taxonómico de las especies chilenas de las familias Veronicellidae, Pupillidae y Achatinellidae, como parte de una serie de análisis taxonómicos sobre los moluscos terrestres de Chile que se elabora como seguimiento a la sinopsis del grupo publicada con anterioridad ([...] tuardoyVega">Stuardo & Vega 1985). Son pocos los trabajos trascendentes publicados después de la sinopsis. En la actualidad hay descritas dos especies de Veronicellidae, dos de Pupillidae y 21 especies de Achatinellidae. De éstas, el único registro de Chile para Heterovaginina limayana Lesson es cuestionable y la subespecie Pupoides (Ischnopupoides) minimus costatus Biese, es considerada inválida. Se presenta una exhaustiva compilación de la sinonimia, junto a una discusión morfológica de los caracteres de la concha y de la distribución topotípica de cada una de las especies conocidas. Sin embargo, es ya necesario realizar estudios genéticos de especiación en los morfos del único veronicélido ampliamente distribuido en Chile central y sur, y en las especies de Orthurethra encontrados en Chile continental y sus islas oceánicas. Abstract in english The content of this paper, part of a series of taxonomic analysis of the land mollusca of Chile being written as a follow up to a synopsis published earlier (Stuardo & Vega 1985), examines the status of the Veronicellidae, Pupillidae and Achatinellidae. Only a few meaning [...] ful contributions have been published after the synopsis. So far, two species of Veronicellidae, two species of Pupillidae and 21 species of Achatinellidae have been recorded. Of these, Heterovaginina limayana Lesson with only one record from Chile continues being questioned and the subspecies Pupoides (Ischnopupoides) minimus costatus Biese, is here considered invalid. A full synonymic compilation, with a discussion of morphological distinctive shell traits and topotypic geographical distributions is given for each of these species. However, much needed taxonomic work on the genetic of speciation becomes necessary for the understanding of the morphs of the only widely distributed veronicellid species in central and south Chile and the species of Orthurethra found in continental Chile and the Oceanic Islands

  15. Aspectos ultraestruturais de hemócitos de Biomphalaria glabrata Say (1818 (Gastropoda: Planorbidae analisados sob microscopia eletrônica de transmissão Ultrastructural aspects of hemocytes from Biomphalaria glabrata Say (1818 (Gastropoda: Planorbidae analysed with transmission eletronic microscopy

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    Marco Antonio Vasconcelos Santos

    2009-09-01

    Full Text Available Os hemócitos do caramujo Biomphalaria glabrata, um importante transmissor do trematódeo Schistosoma mansoni no Brasil, foram coletados de especimens na região Bragantina, localizada a oeste do estado do Pará. Os hemócitos foram examinados por meio de microscopia eletrônica de transmissão. As células foram fixadas pelo método de rotina com o uso do tampão PHEM (PIPES, HEPES, EGTA e Magnésio. Foram descritos os aspectos ultra-estruturais celulares como inclusões citoplasmáticas limitadas por membranas, mitocôndrias, retículos endoplasmáticos e outros. As observações mostram que esse tampão possui a propriedade de preservação do citoesqueleto celular, apresentando bons resultados na preservação das estruturas dos hemócitos e suas organelas.The blood cells of the pulmonate snail Biomphalaria glabrata from the region of Bragantina in the state of Pará, an important vector of the trematode Schistosoma mansoni in Brazil, were collected and fixed by routine method with PHEM buffer and examined with transmission electron microscopy. Ultrastructural cellular aspects like cytoplasmic inclusions, mitochondrion, vesicles and others organelles are described. The buffer used resulted in good preservations of the hemocytes and their organelles.

  16. Aspectos ultraestruturais de hemócitos de Biomphalaria glabrata Say (1818) (Gastropoda: Planorbidae) analisados sob microscopia eletrônica de transmissão / Ultrastructural aspects of hemocytes from Biomphalaria glabrata Say (1818) (Gastropoda: Planorbidae) analysed with transmission eletronic microscopy

    Scientific Electronic Library Online (English)

    Marco Antonio Vasconcelos, Santos; José Antonio Picanço, Diniz.

    2009-09-01

    Full Text Available Os hemócitos do caramujo Biomphalaria glabrata, um importante transmissor do trematódeo Schistosoma mansoni no Brasil, foram coletados de especimens na região Bragantina, localizada a oeste do estado do Pará. Os hemócitos foram examinados por meio de microscopia eletrônica de transmissão. As células [...] foram fixadas pelo método de rotina com o uso do tampão PHEM (PIPES, HEPES, EGTA e Magnésio). Foram descritos os aspectos ultra-estruturais celulares como inclusões citoplasmáticas limitadas por membranas, mitocôndrias, retículos endoplasmáticos e outros. As observações mostram que esse tampão possui a propriedade de preservação do citoesqueleto celular, apresentando bons resultados na preservação das estruturas dos hemócitos e suas organelas. Abstract in english The blood cells of the pulmonate snail Biomphalaria glabrata from the region of Bragantina in the state of Pará, an important vector of the trematode Schistosoma mansoni in Brazil, were collected and fixed by routine method with PHEM buffer and examined with transmission electron microscopy. Ultrast [...] ructural cellular aspects like cytoplasmic inclusions, mitochondrion, vesicles and others organelles are described. The buffer used resulted in good preservations of the hemocytes and their organelles.

  17. Variabilidad geográfica en la tolerancia térmica y economía hídrica del gastrópodo intermareal Nodilittorina peruviana (Gastropoda: Littorinidae, Lamarck, 1822 Geographic variability in thermal tolerance and water economy of the intertidal gastropod Nodilittorina peruviana. (Gastropoda: Littorinidae, Lamarck, 1822

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    JOSE MIGUEL ROJAS

    2000-09-01

    Full Text Available El gastrópodo Nodilittorina peruviana es un habitante común de la zona intermareal rocosa de la costa norte y centro de Chile. Las poblaciones de esta especie se caracterizan por presentar distribuciones agregadas. Por medio de mediciones de terreno y ensayos de laboratorio se evaluó la influencia de la agregación sobre las habilidades de termorregulación y conservación de agua, en individuos pertenecientes a dos localidades de la costa de Chile que presentan distintos regímenes termales (Taltal 25º 25' S; 70º 29' W y Las Cruces 33º 35' S; 71º 38' W. Los resultados indican que la influencia de la agregación sobre las habilidades termorregulatorias es dependiente de las condiciones locales. A pesar de que los individuos de ambas localidades presentaron puntos de tolerancia térmica similares, los caracoles de Taltal mostraron tasas de pérdidas de agua menores. El tamaño de las agregaciones se relacionó en forma negativa con la tasa de pérdida de agua de los individuos de ambas localidades. En el caso de Taltal se observó un límite de tolerancia menor que en Las Cruces y una relación positiva entre tamaño de la agregación y temperatura grupal. Los resultados demuestran que las condiciones ambientales locales puede ser determinante para la efectividad de los mecanismos de termorregulación.The gastropod Nodilittorina peruviana inhabit rocky intertidal of the north and center Chile. Populations of this species exhibits aggregated distributions. Through field and lab records we studied the effect of spatial distribution of snails on their thermoregulatory and water conservation efficiencies. We studied individuals from two localities of the Chilean coast with different climatic conditions (Taltal 25° 25 ` S; 70° 29 ` W and Las Cruces 33° 35 ` S; 71° 38 ` W. Results indicate that the influence of spatial distribution thermoregulatory efficiency is dependent of the local conditions. Although individuals from both localities presented similar thermal tolerances, snails from Taltal showed lower rates of water loss. Aggregations size were negatively related with the rate of water loss in individuals from both localities. Only, individuals from Taltal decreased their limit of thermal tolerance, and exhibited a positive relationship between aggregation size and the temperature of the group. Results demonstrated that the local environmental conditions are determinate thermoregulatory strategies.

  18. Distribución y abundancia de Melanoides tuberculata (Gastropoda: Thiaridae) en la Reserva de la Biosfera Pantanos de Centla, Tabasco, México / Distribution and abundance of Melanoides tuberculata (Gastropoda: Thiaridae) in the Biosphere Reserve of Pantanos de Centla, Tabasco, Mexico

    Scientific Electronic Library Online (English)

    Natalia C., ALBARRAN-MELZE; Luis J., RANGEL-RUIZ; Jaquelina, GAMBOA-AGUILAR.

    2009-04-01

    Full Text Available Se estudió la distribución y abundancia de Melanoides tuberculata en la Reserva de la Biosfera Pantanos de Centla. Los muestreos se realizaron en 19 lagunas distribuidas en el interior de la Reserva durante la época de lluvias (septiembre y octubre 2003) y en la época de estiaje (abril y mayo 2004). [...] Para conocer el patrón de distribución espacial se utilizaron índices de agregación: Índice de Morisita (?) y Parámetro k. Se encontró la presencia de esta especie en 18 de las lagunas muestreadas. Se recolectaron 13,597 individuos. La mayor abundancia se presentó en la época de lluvias (8,364 individuos). Las poblaciones en cada laguna presentaron un patrón de distribución espacial agregado. Durante la época de lluvias se encontró una correlación inversa entre la abundancia y demanda química de oxígeno y directa con nitratos, y en la de estiaje inversa entre la abundancia y salinidad y directa con nitratos, nitritos y potencial de hidrógeno. Abstract in english We studied the distribution and abundance of Melanoides tuberculata in the Centla Swamps Biosphere Reserve. We sampled 19 lagoons, during the rainy (September - October 2003) dry (April - May 2004) seasons. We used the variance: Morisita's Index (?) and the k parameter to estimate the distribution p [...] attern space aggregation index. We registered the species 18 lagoons. A total of 13,597 individuals were collected, the greater abundance appeared during the rainy season (8,364 individuals). All populations presented an aggregated spatial distribution pattern. Abundance was inversely correlated with chemical oxygen demand and directly correlated with nitrates during the rainy season. During the dry season, abundance was inversely correlated with salinity and directly with nitrates, nitrites and pH.

  19. EL GÉNERO ECHINOLITTORINA HABE, 1956 (GASTROPODA: LITTORINIDAE) DE LOS ECOSISTEMAS ROCOSOS DE LA COSTA PACÍFICA COLOMBIANA / The genus Echinolittorina Habe, 1956 (Gastropoda: Littorinidae) from rocky shores of Colombian Pacific Coast

    Scientific Electronic Library Online (English)

    ÁLVARO, GIRALDO-CARDONA; FANNY LORENA, GONZÁLEZ-ZAPATA; LUZ ÁNGELA, LÓPEZ DE MESA-AGUDELO; EDGARDO, LONDOÑO-CRUZ; JAIME R., CANTERA-K..

    2014-06-30

    Full Text Available Se analizaron taxonómicamente por medio de caracteres de la concha 233 especímenes del género Echinolittorina (familia Littorinidae) recolectados en ecosistemas rocosos del Pacífico colombiano. Los especímenes revisados se encuentran depositados en la Colección de Referencia de Biología Marina de la [...] Universidad del Valle (CRBMUV) y provienen de localidades en los departamentos de Valle del Cauca (Bahía Málaga, Bahía de Buenaventura), Cauca (Isla Gorgona, Guapi) y Nariño (Mulatos, Parque Nacional Natural Sanquianga). Hasta este trabajo, se pensaba que esta familia estaba representada solamente por tres especies en el Pacifico colombiano y en este estudio se registran seis especies: Echinolittorina apicina, E. atrata, E. conspersa, E. dubiosa, E. paytensis, y E. tenuistriata. Se incluye una descripción morfológica de cada una de ellas para facilitar su identificación. Abstract in english Shell characters were used to carry out a taxonomic analysis of 233 specimens of the family Littorinidae collected at rocky shores on the Colombian Pacific coast. The specimens were deposited in the Marine Biology Reference Collection-Universidad del Valle. The lots included in the study were from V [...] alle del Cauca ( Malaga and Buenaventura bays), Cauca ( Gorgona Island) and Nariño ( Sanquianga National Natural Park) departments. Six species are reported in this work (Echinolittorina apicina, E. atrata, E. conspersa, E. dubiosa, E. paytensis, and E. Tenuistriata), although the family was previously thought to be represented in the Colombian Pacific coast by three species. To facilitate their identification, a morphological description of each species is also presented.

  20. The effects of temperature and oxygen availability on intracapsular development of Acanthina monodon (Gastropoda: Muricidae) / El efecto de la temperatura y la disponibilidad de oxígeno sobre el desarrollo intracapsular de Acanthina monodon (Gastropoda: Muricidae)

    Scientific Electronic Library Online (English)

    MIRIAM, FERNÁNDEZ; PAULA, PAPPALARDO; KATHERINE, JENO.

    2006-06-01

    Full Text Available Los organismos marinos y dulceacuícolas muestran modelos similares de cuidado parental y están confrontados con similares restricciones para incubar, lo que sugiere que existen límites ambientales comparables guiando la evolución del cuidado parental en sistemas acuáticos. El bajo coeficiente de dif [...] usión y la baja solubilidad del oxígeno en ambientes acuáticos afecta la adquisición de oxígeno y por lo tanto la capacidad para agregar los embriones. El efecto de otras variables ambientales críticas, como la temperatura, es menos claro. Se evaluaron los efectos de la temperatura y la disponibilidad de oxígeno sobre (1) el número de embriones desarrollados y sin desarrollar, (2) la proporción de embriones que alcanza estados avanzados de desarrollo (contabilizando no solo embriones desarrollados y sin desarrollar sino también anormales), (3) la asincronía en el desarrollo (estimada solo cuando ocurrió desarrollo embrionario), y (4) el tamaño final, con el objetivo final de identificar las limitaciones que estos factores imponen sobre el cuidado parental en el mar. La especie modelo fue el gastrópodo Acanthina monodon. Cápsulas recientemente depositadas fueron colectadas e incubadas bajo diferentes condiciones experimentales de temperatura (7, 11, 15 y 19 °C) y oxígeno (hipoxia: 50-60 % saturación de aire; normoxia; e hiperoxia: 150-160 %). Más embriones permanecieron en fases tempranas del desarrollo al final del experimento en hipoxia y a 19 °C. El número promedio de embriones desarrollados fue significativamente más bajo en hipoxia que bajo normoxia e hiperoxia, pero no fue influenciado por la temperatura. Sin embargo, la temperatura de incubación afectó otras variables de respuesta. Menores tamaños de los embriones y mayores niveles de asincronía al final del desarrollo fueron observados en las más altas temperaturas experimentales, lo que podría tener consecuencias negativas sobre la sobrevivencia posasentamiento. Las altas temperaturas también afectan el comportamiento y los costos asociados a la provisión de oxígeno a los embriones en braquiuros. Estas evidencias sugieren que agregar embriones en el océano, aun en condiciones óptimas de oxígeno, podría ser desfavorable a altas temperaturas. Los patrones espaciales de distribución de especies incubadoras tienden a apoyar esta predicción. Nuestro análisis también cobra relevancia en el escenario actual de aumento de la temperatura media de los océanos y de la proporción de zonas anóxicas Abstract in english Freshwater and marine organisms show similar models of parental care and are faced with similar constraints to brood, which suggest that comparable environmental limits drive the evolution of parental care in aquatic systems. In fact, the low diffusion coefficient and solubility of oxygen in aquatic [...] environments affect oxygen acquisition and therefore the capacity to aggregate embryos. The effect of other critical environmental variables, such as temperature, is less clear. We assessed the effects of temperature and oxygen availability on (1) the number of developed and undeveloped encapsulated embryos, (2) the proportion of embryos reaching advanced stages during intracapsular development (counting not only developed and undeveloped embryos but also abnormal embryos), (3) asynchrony in development (estimated only in capsules in which development occurred), and (4) final embryo size, as the first step toward identifying the main factors constraining parental care in the ocean. We used the gastropod Acanthina monodon as a model because it has an extended latitudinal range of distribution and exhibits feeding larvae during intracapsular development. The latter factor is relevant because previous studies have suggested that sibling cannibalism could be triggered by intracapsular competition for oxygen. Freshly laid egg capsules were collected and incubated until embryos hatched under different experimental temperatures (7, 11, 15 and 19 °C) and oxygen conditions (hypoxia: 50-60 % air saturat

  1. The effects of temperature and oxygen availability on intracapsular development of Acanthina monodon (Gastropoda: Muricidae) El efecto de la temperatura y la disponibilidad de oxígeno sobre el desarrollo intracapsular de Acanthina monodon (Gastropoda: Muricidae)

    OpenAIRE

    MIRIAM FERNÁNDEZ; PAULA PAPPALARDO; KATHERINE JENO

    2006-01-01

    Freshwater and marine organisms show similar models of parental care and are faced with similar constraints to brood, which suggest that comparable environmental limits drive the evolution of parental care in aquatic systems. In fact, the low diffusion coefficient and solubility of oxygen in aquatic environments affect oxygen acquisition and therefore the capacity to aggregate embryos. The effect of other critical environmental variables, such as temperature, is less clear. We assessed the ef...

  2. Avaliação dos problemas enfrentados no manejo do caramujo gigante africano Achatina fulica (Gastropoda: Pulmonata) no Brasil / Evaluation of the problems faced in the management of the giant African snail Achatina fulica (Gastropoda: Pulmonata) in Brazil

    Scientific Electronic Library Online (English)

    Eduardo, Colley; Marta Luciane, Fischer.

    2009-12-01

    Full Text Available [...] Abstract in english The giant African snail Achatina fulica Bowdich, 1822 was introduced into Paraná, Brazil, in the 1980s. Since then, it has spread across the country, despite its known invasive status on a global scale. The main objective of this study was to assess the problems faced in the management of the giant [...] African snail. To accomplish that, we gathered and analyzed information available on the internet, scientific databases, field studies, as well as interviews and consultations with official agencies, NGOs, museums, the scientific community and people that coexist with the species. Despite the fact that extensive information has been generated regarding A. fulica (1,340 articles, 65 summaries in national annals, 40,700 pages on the internet), essential to promote control measures to hinder the propagation of this species, the majority of the available information remains inaccessible to the world at large. Moreover, the environmental, economic and health impacts of this species remain unclear, which may contribute to discouraging the initiation of management actions. Finally, control measures are still inefficient due to the generalist profile of this species and the lack of knowledge concerning its biology and ecology. Thus, in conclusion, even though A. fulica has been an invasive species for over a century in many other countries, it is difficult to find evidence supporting the need to subsidize its management. This may be an indication that many other, poorly known exotic species will have time and the proper conditions to become established and cause problems before they come to be recognized as invasive.

  3. Avaliação dos problemas enfrentados no manejo do caramujo gigante africano Achatina fulica (Gastropoda: Pulmonata no Brasil Evaluation of the problems faced in the management of the giant African snail Achatina fulica (Gastropoda: Pulmonata in Brazil

    Directory of Open Access Journals (Sweden)

    Eduardo Colley

    2009-12-01

    Full Text Available The giant African snail Achatina fulica Bowdich, 1822 was introduced into Paraná, Brazil, in the 1980s. Since then, it has spread across the country, despite its known invasive status on a global scale. The main objective of this study was to assess the problems faced in the management of the giant African snail. To accomplish that, we gathered and analyzed information available on the internet, scientific databases, field studies, as well as interviews and consultations with official agencies, NGOs, museums, the scientific community and people that coexist with the species. Despite the fact that extensive information has been generated regarding A. fulica (1,340 articles, 65 summaries in national annals, 40,700 pages on the internet, essential to promote control measures to hinder the propagation of this species, the majority of the available information remains inaccessible to the world at large. Moreover, the environmental, economic and health impacts of this species remain unclear, which may contribute to discouraging the initiation of management actions. Finally, control measures are still inefficient due to the generalist profile of this species and the lack of knowledge concerning its biology and ecology. Thus, in conclusion, even though A. fulica has been an invasive species for over a century in many other countries, it is difficult to find evidence supporting the need to subsidize its management. This may be an indication that many other, poorly known exotic species will have time and the proper conditions to become established and cause problems before they come to be recognized as invasive.

  4. Nueva especie del género Liotia (Gastropoda: Trochoidea: Liotiidae) del Pacífico sur oriental, norte de Chile / New species of the genus Liotia (Gastropoda: Trochoidea: Liotiidae) of the southeastern Pacific, northern Chile

    Scientific Electronic Library Online (English)

    Cecilia, Osorio.

    2012-12-01

    Full Text Available En este estudio se describe una nueva especie del género Liotia descubierta en Bahía Inglesa, norte de Chile, el 8 de agosto de 2007. Liotia chilensis sp. nov. se caracteriza por presentar una concha planoespiral, gruesa, pequeña, ombligo abierto y de color blanco. La escultura externa de Liotia chi [...] lensis sp. nov. presenta cordones axiales primarias marcadas bien definidas y sobresalientes que la diferencian claramente de la especie simpátrica L. cancellata, el único representante del género descrito hasta ahora en la región. Liotia chilensis sp. nov. posee otras características diagnósticas adicionales, como una abertura de la concha con el borde liso y una leve prolongación triangular hacia la columela, lo que dispone una forma cuadrangular a la abertura. Las conchas de Liotia chilensis sp. nov. fueron encontradas sobre sustrato arenoso, entre 15 y 32 m de profundidad. Abstract in english This study describes a new species of the genus Liotia discovered in Bahía Inglesa, northern Chile, on 8 August 2007. Liotia chilensis sp. nov. is characterized by a planispiral shell which is thick, small, umbilicated and white. The external sculpture of L. chilensis sp. nov. has well-defined consp [...] icuous primary axial cords which clearly differentiate it from the sympatric species L. cancellata, the only species of this genus described up to now in Chile. As additional diagnostic character of L. chilensis sp. nov. is a shell aperture with a smooth border that has a slight triangular prolongation towards the columella, which gives a quadrangular form to the aperture. Shells of L. chilensis sp. nov. were found on sandy substrate between 15 and 32 m depth.

  5. First record of the invasive snail Melanoides tuberculatus (Gastropoda: Prosobranchia: Thiaridae) in the Paranã River basin, GO, Brazil / Primeiro registro do gastrópode africano invasor Melanoides tuberculatus (Gastropoda: Prosobranchia: Thiaridae) na Bacia do Rio Paranã, GO, Brasil

    Scientific Electronic Library Online (English)

    F., Rocha-Miranda; M. J., Martins-Silva.

    1109-11-01

    Full Text Available O gastrópode Thiaridae Melanoides tuberculatus (Müller, 1774), nativo da Ásia e do Leste Africano, é registrado pela primeira vez na Bacia Hidrográfica do Rio Paranã (Estado de Goiás). Não se conhecem os vetores de introdução da espécie, mas o setor de aquariofilia foi apontado por alguns moradores [...] locais como a mais provável causa. Os espécimes foram coletados em três corpos d´água depois de serem investigados vinte e sete rios e lagoas. A possibilidade de dispersão dessa espécie para outros habitats e os efeitos potenciais dessa introdução sobre a comunidade nativa são discutidos no artigo. Abstract in english The Thiarid snail Melanoides tuberculatus (Müller, 1774), native to Asia and East Africa was recorded for the first time in the Paranã River basin, Goiás State. There is no evidence concerning introduction vectors but aquarium releases is the most probable vector. Specimens were collected at three d [...] ifferent water bodies after twenty-seven rivers were investigated. The possible spread of this species to other habitats and potential effects on native thermal water communities are discussed.

  6. Variabilidad geográfica en la tolerancia térmica y economía hídrica del gastrópodo intermareal Nodilittorina peruviana (Gastropoda: Littorinidae, Lamarck, 1822) Geographic variability in thermal tolerance and water economy of the intertidal gastropod Nodilittorina peruviana. (Gastropoda: Littorinidae, Lamarck, 1822)

    OpenAIRE

    JOSE MIGUEL ROJAS; JOSE MIGUEL FARIÑA; Soto, Ruben E.; FRANCISCO BOZINOVIC

    2000-01-01

    El gastrópodo Nodilittorina peruviana es un habitante común de la zona intermareal rocosa de la costa norte y centro de Chile. Las poblaciones de esta especie se caracterizan por presentar distribuciones agregadas. Por medio de mediciones de terreno y ensayos de laboratorio se evaluó la influencia de la agregación sobre las habilidades de termorregulación y conservación de agua, en individuos pertenecientes a dos localidades de la costa de Chile que presentan distintos regímenes termal...

  7. Composición, abundancia y distribución de Pteropoda (Mollusca: Gastropoda) en la zona nerítica, del sur del Golfo de México (Agosto, 1995) / Composition, abundance and distribution of Pteropoda (Mollusca: Gastropoda) on the neritic zone, at the southern Gulf of Mexico (August, 1995)

    Scientific Electronic Library Online (English)

    César, Flores-Coto; Hisol L., Arellanes; Jesús, Sánchez Robles; Antonio, López Serrano.

    2013-12-01

    Full Text Available Se analizó la composición distribución y abundancia de los pterópodos en relación a las condiciones hidrográficas de la columna de agua (0 a 105 m) en el Golfo de México. Durante agosto de 1995, se recolectaron 95 muestras de zooplancton en 28 estaciones sobre la plataforma continental, distribuidas [...] en cinco transectos frente a los principales sistemas lagunares del sur del Golfo de México, desde la desembocadura del rio Coatzacoalcos, hasta Boca de Paso Real de la Laguna de Términos. Las muestras se recolectaron en cinco niveles de profundidad. De los taxa identificados, tres de ellos constituyeron el 90% de la abundancia total de pterópodos: Creseis acicula f. acicula (72.7%), C. acicula f. clava (8.2%) y Limacina trochiformis (9.3%). La mayor densidad del grupo ocurrió en los primeros 18 m, sin embargo, 19 de los 39 grupos registrados, no ocurrieron en la capa más superficial (0 a 6 m) y otros lo hicieron con bajas densidades. Los resultados de Análisis Canónico de Correspondencia (ACC) permiten considerar que ningún parámetro por si solo determina la distribución de estos organismos en la columna de agua, pero en cambio sí el hábitat. Las especies de afinidad tropical/subtropical y hábitat nerítico fueron las más abundantes y ocurrieron principalmente en la capa superficial, en tanto que las formas oceánicas fueron las de menor abundancia y ocurrieron principalmente en las capas profundas, probablemente como resultado de la entrada de agua oceánica a la plataforma en su parte más profunda. Abstract in english The composition, distribution, and abundance of pteropods were analyzed in relation to hydrographic conditions of the water column (0 to 105 m) in the Gulf of Mexico. Up to 95 samples of zooplankton were collected during August 1995 at 28 stations arranged in five transects on the continental shelf [...] off the main lagoonal systems in the southern Gulf of Mexico, from the Coatzacoalcos River inlet to Paso Real inlet of Términos lagoon . Samples were collected at five depth ranges. Three of the identified taxa constituted 90% of the total pteropod abundance: Creseis aciculaf. acicula (72.7%), C. acicula f clava (8.2%), and Limacina trochiformis (9.3%). The highest density of the group occurred within the first 18 m, but 19 of the 39 groups registered were absent from the surface layer (0-6 m), and others had low densities. The results of a CCA suggest that not one parameter by itself determines the distribution of these organisms in the water column, but the habitat of the species does. Species with tropical/subtropical and coastal affinities were the most abundant and occurred mainly in the surface layer, while the oceanic forms were less abundant and occurred mainly in the deep layers probably resulting from the inflow of oceanic water toward the shelf at its deepest layers.

  8. Parámetros reproductivos y poblacionales de Thais chocolata (Duelos, 1832 (Gastropoda, Thaididae, en la reserva marina La Rinconada, Antofagasta, Chile Reproductive and population parameters of Thais chocolata (Duclos, 1832 (Gastropoda, Thaididae in La Rinconada marine reserve, Antofagasta, Chile

    Directory of Open Access Journals (Sweden)

    Marcela Cantillánez

    2011-11-01

    Full Text Available Para obtener antecedentes reproductivos y poblacionales de Thais chocolata que contribuyan a validar su actual normativa pesquera, se realizó un estudio en el área protegida de la reserva marina La Rinconada, Antofagasta, Chile, entre diciembre 2008 y enero 2010. Los resultados obtenidos indicaron a nivel reproductivo, que el desarrollo gonadal de la población es asincrónico, encontrándose ejemplares en diferentes etapas de maduración durante el año. Los individuos maduros se estratificaron entre 5 y 13 m de profundidad, y gran parte del año formaron agregaciones a 5 m de profundidad. Se determinaron períodos de mayor madurez en julio-agosto, y en noviembre-enero, manifestándose las agregaciones más importantes al final de ellos. Una relación se observó entre meses de mayor madurez y registro de agregaciones, con aquellos de mayor variación intradiaria de temperatura. A nivel poblacional los resultados permitieron estimar una población de 2,3*10(6 ejemplares, donde el 39% se encontró sobre la talla mínima legal (TML = 55 mm. Los parámetros de crecimiento mostraron crecimiento relativamente lento, que podría estar influenciado por la alta variabilidad que presenta la temperatura de fondo en este sector. Mientras que su talla crítica, y la talla de primera madurez sexual poblacional, resultaron ser mayores a la TML. Se determinó la necesidad de revisar la normativa pesquera actual de esta especie, y se demostró la efectividad de las reservas marinas propiciadas por el Estado en la conservación de los recursos marinos.Reproductive and population parameters of Thais chocolata that would contribute to the validation of the current extraction standards were obtained by performing a study in the protected area of La Rinconada Marine Reserve, Antofagasta, Chile, from December 2008 to January 2010. In terms of reproduction, the results revealed asynchronic gonad development in the population, with specimens in different stages of maturity throughout the year. Mature individuals were distributed between 5 and 13 m depth, forming aggregations at 5 m depth during much of the year. Periods of greater maturity were observed from July to August and November to January, with the most important aggregations at the end of both periods. A relationship was observed between the months with the greatest maturity and aggregations and the months with the highest daily temperature fluctuations. At the population level, the results allowed us to estimate 2.3*10(6 individuals, with 39% of this population over the minimum legal size (55 mm. The relatively slow growth estimated for this population was probably influenced by the high variability of the bottom temperature in this area. The critical size and size at first maturity of the population were higher than the minimal legal size, making it is necessary to review the current fishing regulation for this species. The effectiveness of the State marine reserves in the conservation of this marine resource was demonstrated.

  9. Marine Mollusca of isotope stages of the last 2 million years in New Zealand. Part 3, Gastropoda (Vetigastropoda - Littorinimorpha)

    International Nuclear Information System (INIS)

    Three new species: Grandicrepidula hemispherica (Nukumaruan, S Hawke's Bay), Pelicaria Granttaylori (Mangapanian-early Nukumaruan, Wanganui-Hawke's Bay), Pelicaria arahura (Waipipian-early Mangapanian, Westland and Hawke's Bay). Drawings of marine species in Smith's (1874) three plates of New Zealand molluscan types are republished. Further Australian molluscs in Wanganui Basin: Sabia australis (Lamarck), Clanculus plebejus (Philippi), both early Nukumaruan. Further northern New Zealand molluscs in Wanganui Basin: Stephopoma roseum (Quoy and Gaimard), OIS 13, 9. Distinctive gastropods extinct at end Nukumaruan: Struthiolaria frazeri (Hutton), Taxonia suteri (Marwick). Taniella planisuturalis (Marwick) (Opoitian-Nukumaruan, southern NZ) and Trivia (Ellatrivia) zealandica (Kirk) (Nukumaruan, Hawke's Bay-Wanganui; Castlecliffian, North Canterbury) occur in Castlecliffian (OIS 15?) rocks at Whakatane. Cantharidella tessellate (A. Adams) and Risellopsis varia (Hutton), formerly Haweran, are recorded from Nukumaruan and Castlecliffian rocks, respectively. New fossil late Nukumaruan-early Castlecliffian records listed from Mikonui-1 offshore well, Westland, include Malluvium calcareum (Suter) and 10 other species. Other biostratigraphically useful gastropods: Calliostoma (Maurea) nukumaruense (Laws) (Mangapanian-OIS 17); Argobuccinum pustulosum (Lightfoot), Semicassis labiate (Perry) (both earliest in OIS 7). New synonymy: Zeacumantus perplexus (Marshall and Murdoch) =Z. luts perplexus (Marshall and Murdoch) =Z. lutulentus (Kiener); Pelicaria vermis (Martyn) =all named Nukumaruan-Recent forms (other than P. rugosa (Marwick) and P. granttaylori n. sp.); Trivia flora Marwick =T.zealandica Kirk. Taxonomy revised: Zelippistes benhami (Suter) (OIS 13 and 9 at Wanganui), distinguished from Lippistes and Separatista; Stiracolpus species, informally; Maoricrypta profunda (Hutton), Waipipian-early Castlecliffian (- OIS 19); M. radiata (Hutton) (=incurva Zittel,=hochetteriana Woods, =wilckensi Finlay), (Middle Miocene?) Tongaporutuan-Opoitian; Eunaticina cincta (Hutton), holotype illustrated. (author). 427 refs., 22 figs.

  10. A new species of Urocopitid land snail from Haiti and a discussion of the genus Autocoptis (Gastropoda: Urocoptidae)

    Scientific Electronic Library Online (English)

    Fred G., Thompson.

    1187-11-01

    Full Text Available Para Haití se describe Autocoptis paulsoni n. sp. Esta especie se caracteriza por su gran tamaño, su forma cilíndrica-cónica, teleoconcha en forma de costillas, una clara pero débil quilla circumbasal y concha juvenil cónica y abreviada. Es muy similar a Autocoptis gruneri (Dunker, 1844), que se des [...] cribe de nuevo y su distribución se revisa. También se presenta el estado taxonómico del género Autocoptis y del subgénero Urocoptola. El género es endémico de La Española y las islas satélites. Abstract in english Autocoptis paulsoni n. sp. is described from Haiti. it is characterized by its large size, its cylindricaltapered shape, its fine costate sculpture on the teleoconch, a distinct but weak circum basal keel and its abbreviate conical juvenile shell. it is most similar to Autocoptis gruneri (Dunker 184 [...] 4), which is redescribed, and its distribution is reviewed. The taxonomic status of the genus Autocoptis Pilsbry 1902 and its subgenus Urocoptola Clench, 1 935 are reviewed. The genus is endemic to Hispaniola and satellite islands.

  11. Nouvelle localité de Valvata cristata (O.F. Müller, 1774 (Gastropoda, Heterobranchia,Valvatidae en Alsace (France, Bas-Rhin

    Directory of Open Access Journals (Sweden)

    Antoine Wagner

    2012-01-01

    Full Text Available Valvata cristata is mostly documented in Alsace by data anterior to 1919. Only one recent locality, at Offendorg (Bas-Rhin confirms the occurrence of this species in this area. In this paper, a new locality is added, a reed bed alimented by phreatic water near Eschau (Bas-Rhin where two living specimens were collected in April 2011. Considering the current species distribution, I propose to include Valvata cristata under the category “rare” in the Red List of the molluscs from Alsace.

  12. Première mention de Pomatias elegans (O. F. Müller, 1774 (Gastropoda, Caenogastropoda, Pomatiidae au Nord de la Tunisie

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    Monia Ben Romdhane

    2008-01-01

    Full Text Available Pomatias elegans is a very common operculate land gastropod in Southern Europe. However, its occurrence in North Africa is poorly documented, limited to few old references that should be confirmed. This paper reportes the first mention of the species in Tunisia. Furthermore, this work brings in preliminary data on P. elegans’ morphology and ecology at the edge of its main distribution area.

  13. On the presence of Helix lucorum Linnaeus, 1758 (Mollusca, Gastropoda, Helicidae in Le Vesinet, a western suburb of Paris

    Directory of Open Access Journals (Sweden)

    Henk K. Mienis

    2010-01-01

    Full Text Available The Turkish snail Helix lucorum is reported from a garden in Le Vesinet (Paris, France. This introduced species seems to be present in a number of gardens in that suburb. Additional populations may be expected in other areas of France and elsewhere in Europe where living specimens of Helix lucorum are sold on markets and in shops.

  14. First report of Angiostrongylus cantonensis (Nematoda: Metastrongylidae) in Achatina fulica (Mollusca: Gastropoda) from Southeast and South Brazil

    OpenAIRE

    Arnaldo Maldonado Júnior; Simo?es, Raquel O.; Oliveira, Ana Paula M.; Motta, Esther M.; Fernandez, Mo?nica A.; Pereira, Zilene M.; Monteiro, Simone S.; Lopes Torres, Eduardo J.; Silvana Carvalho Thiengo

    2010-01-01

    The rat lungworm Angiostrongylus cantonensis is a worldwide-distributed zoonotic nematode that can cause human eosinophilic meningoencephalitis. Here, for the first time, we report the isolation of A. cantonensis from Achatina fulica from two Brazilian states: Rio de Janeiro (specifically the municipalities of Barra do Piraí, situated at the Paraiba River Valley region and São Gonçalo, situated at the edge of Guanabara Bay) and Santa Catarina (in municipality of Joinville). The lungworms w...

  15. Growth rate fitting using the von Bertalanffy model: analysis of natural populations of Drepanotrema spp. snails (Gastropoda: Planorbidae)

    Scientific Electronic Library Online (English)

    Alejandra, Rumi; Diego, E; Gregoric, Gutiérrez; M. Andrea, Roche.

    2007-06-01

    Full Text Available En Argentina se encuentran seis especies del género Drepanotrema. El ciclo de vida en sistemas naturales de Drepanotrema depressissimu y D. lucidum ha sido muy poco estudiado, excepto por algunas observaciones aisladas. El objetivo de este estudio es analizar las principales tendencias de la poblaci [...] ón en la Laguna Paiva, Argentina. Usamos modelos de crecimiento y metodologías comparativas entre las especies y los ambientes en Paiva y la isla Martín García (IMG). Además, las curvas teóricas del modelo de von Bertalanffy para cada población fueron contrastadas con las muestras utilizando la prueba ?². Los tamaños esperados fueron transformados en porcentajes de tamaño máximo y las cohortes se iniciaron a partir del tiempo cero, lo cual les permitió ser independientes de la fecha inicial real o estimada y con ello ser comparables. Se utilizó una escala de tiempo similar debido a que los valores de k demostraron ser sensibles a la escala de tiempo. El tamaño máximo alcanzado por D. lucidum fue de 6.9 mm y por D. depressissimun fue de 9.38 mm. Las tasas de crecimiento (k) fluctuaron de 1.302-1.368 en la primera especie y 1.339-1.509 para la segunda especie. No fueron encontradas diferencias significativas en las curvas de crecimiento entre las especies que habitaban en Paiva ni en los diferentes cuerpos de agua de IMG, independientes del inicio de cada cohorte y del tamaño máximo. En general no se observaron cohortes de invierno, excepto en una población de D. kermatoides (IMG). Al comparar los ritmos de crecimiento anuales y semestrales, la mayoría de las especies alcanzaron el 60 % de su desarrollo durante el primer año y el 85 % ó más durante su segundo año. Abstract in english The genus Drepanotrema includes six species in Argentina. The life cycle in natural systems of Drepanotrema depressissimum, and D. lucidum has been little studied, except for some casual observations. The aim of this study is to analyze main population trends (age structures, recruitment periods, li [...] fe span and curves of individual growth) in Paiva pond, Argentina. We explored growth model fitting and comparison methodologies between species and environments in Paiva pond and Isla Martín García (IMG), to determine interspecific patterns. Theoretical curves of von Bertalanffy’s model for each population were contrasted with samplings using the ?2 test. Expected sizes were transformed into a percentage of maximum size and cohorts started from zero time, which allowed them to be independent of the real or estimated starting date and a comparison was possible. A similar time scale was used, because the k values proved to be sensitive to time scale. Maximum size reached by D. lucidum was 6.9 mm and by D. depressissimum 9.38 mm. Growth rates (k) fluctuated from 1.302 to 1.368 in the first and 1.339 to 1.509 in the second species. No statistically significant differences were found in growth curves among species inhabiting the Paiva pond and in the different IMG water bodies independent of the beginning of each cohort and maximum size. In general, no winter cohorts were observed, except in one population of D. kermatoides (IMG). Comparing circannual and biannual growth rhythms most of the species reached 60 % of their development during their first year, and 85 % or more during their second year. Rev. Biol. Trop. 55 (2): 559-567. Epub 2007 June, 29.

  16. Putative midkine family protein up-regulation in Patella caerulea (Mollusca, Gastropoda) exposed to sublethal concentrations of cadmium

    International Nuclear Information System (INIS)

    A cDNA sequence of a putative midkine (MK) family protein was identified and characterised in the mollusc Patella caerulea. The midkine family consists of two members, midkine and pleiotrophin (PTN), and it is one of the recently discovered cytokines. Our results show that this putative midkine protein is up-regulated in specimens of P. caerulea exposed to sublethal cadmium concentrations (i.e. 0.5 and 1 mg l-1 Cd) over a 10-day exposure period. Semiquantitative RT-PCR and quantitative Real time RT-PCR estimations indicate elevated expression of midkine mRNA in exposed specimens compared to controls. Moreover, RT-PCR Real time values were higher in the viscera (here defined as the part of the soft tissue including digestive gland plus gills) than in the foot (i.e. foot plus head plus heart) of the limpets. At present, information on the functional signalling significance of the midkine family proteins suggests that the up-regulation of P. caerulea putative midkine family protein is a distress signal likely with informative value on health status of the organism and with potential prognostic capability

  17. Isolation and characterization of cultivable fermentative bacteria from the intestine of two edible snails, Helixpomatia and Cornu aspersum (Gastropoda: Pulmonata)

    Scientific Electronic Library Online (English)

    MAR YVONNE, CHARRIER; GERARD, FONTY; BRIGITTE, GAILLARD-MARTINIE; KADER, AINOUCHE; GERARD, ANDANT.

    Full Text Available The intestinal microbiota of the edible snails Cornu aspersum fSyn: H. aspersa), and Helix pomatia were investigated by culture-based methods, 16S rRNA sequence analyses and phenotypic characterisations. The study was carried out on aestivating snails and two populations of H. pomatia were considere [...] d. The cultivable bacteria dominated in the distal part of the intestine, with up to 5.10(9) CFU g -1, but the Swedish H. pomatia appeared significantly less colonised, suggesting a higher sensitivity of its microbiota to climatic change. All the strains, but one, shared ? 97% sequence identity with reference strains. They were arranged into two taxa: the Gamma Proteobacteria with Buttiauxella, Citrobacter, Enterobacter, Kluyvera, Obesumbacterium, Raoultella and the Firmicutes with Enterococcus, Lactococcus, and Clostridium. According to the literature, these genera are mostly assigned to enteric environments or to phyllosphere, data in favour of culturing snails in contact with soil and plants. None of the strains were able to digest filter paper, Avicel cellulose or carboxymethyl cellulose (CMC). Acetogens and methanogenic archaea were not cultivated, so the fate of hydrogen remains questionable. This microbiota could play important roles in the digestive process (fermentation) and the energy supply of the snail (L-lactate, acetate). The choice of cereals and plants by snail farmers should take into account the fermentative abilities of the intestinal microbiota

  18. Do the changes in temperature and light affect the functional response of the benthic mud snail Heleobia australis (Mollusca: Gastropoda)?

    Scientific Electronic Library Online (English)

    THAISA R.F., MAGALHÃES; RAQUEL A.F., NEVES; JEAN L., VALENTIN; GISELA M., FIGUEIREDO.

    1197-12-01

    Full Text Available O objetivo deste estudo foi determinar a influência do aumento de temperatura associado à incidência luminosa na resposta funcional de Heleobia australis. Experimentos foram conduzidos utilizando nove a dez concentrações de alimento para cada tratamento: 20°C sem luz, 30°C sem luz e 30°C sob baixa i [...] ncidência luminosa. Para cada experimento, a resposta funcional tipo III (sigmoidal) apresentou o melhor ajuste e os parâmetros das equações foram determinados. Os resultados sugerem que com o aumento da temperatura no sedimento, H. australis não terá sua taxa de ingestão afetada negativamente. Por outro lado, seu comportamento alimentar parece ser negativamente afetado pela incidência luminosa. As taxas de ingestão estimadas para o conteúdo orgânico na Baía de Guanabara foram: 0,34 µgC ind–1h–1 a 20°C em ausência de luz, 1.44 µgC ind–1h–1 a 30°C em ausência de luz e 0,64 µgC ind–1h–1 a 30°C sob incidência luminosa. Nesta situação, as maiores taxas de ingestão foram estimadas em condições de alta temperatura, mesmo com incidência luminosa, sugerindo que a temperatura parece ter um efeito que predomina sobre o efeito da luz. Porém, considerando maiores concentrações de carbono, mesmo em temperatura alta, o experimento realizado com incidência luminosa apresentou taxas de ingestão mais baixas que aquelas do experimento conduzido a 20°C em ausência de luz. Este estudo fornece a primeira quantificação das taxas de ingestão de H. australis e os efeitos das modificações na temperatura e incidência luminosa no seu comportamento alimentar. Abstract in english The aim of this study was to determine the influence of temperature increase combined to conditions of light incidence on functional response of Heleobia australis. Experiments were conducted using nine to ten food concentrations for each treatment: 20°C without light; 30°C without light and, 30°C u [...] nder low light intensity. For each experiment, the functional response type III (sigmoidal) was fitted and equation parameters were determined. Results suggest that, if the sediment temperature increases, H. australis will not have its ingestion rates affected negatively, whilst its feeding behavior seems to be negatively affected by light. Ingestion rates estimated for organic content in the Guanabara Bay were: 0.34 µgC ind–1h–1 at 20°C without light, 1.44 µgC ind–1h–1 at 30°C without light and 0.64 µgC ind–1h–1 at 30°C under light incidence. Higher ingestion rates were estimated at the high temperature, even under light incidence, and temperature seems to have outweighed the light effect. In contrast, if higher carbon content is considered, despite high temperature, the experiment conducted with light incidence showed lower ingestion rates than those from the experiment at 20°C without light. This study provides the first quantification of H. australis ingestion rates and the effects that changes in temperature and light have on its feeding behavior.

  19. Annotated type catalogue of the Megaspiridae, Orthalicidae, and Simpulopsidae (Mollusca, Gastropoda, Orthalicoidea) in the Natural History Museum, London.

    Science.gov (United States)

    Breure, Abraham S H; Ablett, Jonathan D

    2015-01-01

    The type status is described for 65 taxa of the Orthalicoidea, classified within the families Megaspiridae (14), Orthalicidae (30), and Simpulopsidae (20); one taxon is considered a nomen inquirendum. Lectotypes are designated for the following taxa: Helixbrephoides d'Orbigny, 1835; Simpulopsiscumingi Pfeiffer, 1861; Bulimulus (Protoglyptus) dejectus Fulton, 1907; Bulimusiris Pfeiffer, 1853. The type status of Bulimussalteri Sowerby III, 1890, and Strophocheilus (Eurytus) subirroratus da Costa, 1898 is now changed to lectotype according Art. 74.6 ICZN. The taxa Bulimusloxostomus Pfeiffer, 1853, Bulimusmarmatensis Pfeiffer, 1855, Bulimusmeobambensis Pfeiffer, 1855, and Orthalicuspowissianusvar.niveusPreston 1909 are now figured for the first time. The following taxa are now considered junior subjective synonyms: Bulimusmarmatensis Pfeiffer, 1855 = Helix (Cochlogena) citrinovitrea Moricand, 1836; Vermiculatus Breure, 1978 = Bocourtia Rochebrune, 1882. New combinations are: Kuschelenia (Bocourtia) Rochebrune, 1882; Kuschelenia (Bocourtia) aequatoria (Pfeiffer, 1853); Kuschelenia (Bocourtia) anthisanensis (Pfeiffer, 1853); Kuschelenia (Bocourtia) aquila (Reeve, 1848); Kuschelenia (Bocourtia) badia (Sowerby I, 1835); Kuschelenia (Bocourtia) bicolor (Sowerby I, 1835); Kuschelenia (Bocourtia) caliginosa (Reeve, 1849); Kuschelenia (Bocourtia) coagulata (Reeve, 1849); Kuschelenia (Bocourtia) cotopaxiensis (Pfeiffer, 1853); Kuschelenia (Bocourtia) filaris (Pfeiffer, 1853); Karaindentata (da Costa, 1901); Clathrorthalicusmagnificus (Pfeiffer, 1848); Simpulopsis (Eudioptus) marmartensis (Pfeiffer, 1855); Kuschelenia (Bocourtia) nucina (Reeve, 1850); Kuschelenia (Bocourtia) ochracea (Morelet, 1863); Kuschelenia (Bocourtia) peaki (Breure, 1978); Kuschelenia (Bocourtia) petiti (Pfeiffer, 1846); Clathrorthalicusphoebus (Pfeiffer, 1863); Kuschelenia (Bocourtia) polymorpha (d'Orbigny, 1835); Scholvieniaporphyria (Pfeiffer, 1847); Kuschelenia (Bocourtia) purpurata (Reeve, 1849); Kuschelenia (Bocourtia) quechuarum Crawford, 1939; Quechuasalteri (Sowerby III, 1890); Kuschelenia (Bocourtia) subfasciata Pfeiffer, 1853; Clathrorthalicusvictor (Pfeiffer, 1854). In an addedum a lectotype is being designated for Bulimulus (Drymaeus) interruptusvar.pallidus Preston, 1909. An index is included to all taxa mentioned in this paper and the preceding ones in this series (Breure and Ablett 2011, 2012, 2014). PMID:25632243

  20. Mapping of Buccal Neurons Innervating the Feeding Apparatus of Eobania vermiculata (Gastropoda, pulmonata)

    OpenAIRE

    Amina Essawy

    2001-01-01

    The paired buccal ganglia of Eobania vermiculata were investigated by light and electron microscopical methods, and a surface map of the ganglia was constructed. Mostly eight paired plus an unpaired buccal nerves were observed in dissected animals. Four giant neurons with a diameter more than 100 ?m were identified in the lateral region of each ganglion. Besides the giant neurons, middle - ( 30-60?m) as well as small- ( <30?m) sized neurons were localized. Possible axonal proje...

  1. Phylogeography of the Land Snail Eobania vermiculata (O.F. Müller, 1774 (Gastropoda: Pulmonata along the Croatian Coast and Islands

    Directory of Open Access Journals (Sweden)

    Jasna Puizina

    2013-08-01

    Full Text Available Eobania vermiculata (O.F. Müller, 1774, is a typical Mediterranean species of large land snails. Nonindigenous populations of this species, however, are already established in the USA, Australia and elsewhere in the world, where this species is considered to represent a potentially serious threat as a pest and invasive species. The aims of this study were: 1 to determine the pattern of genetic variation within the Croatian E. vermiculata populations based on analyses of sequence diversity of two mitochondrial genes, 16S rDNA and the cytochrome oxidase I (COI, and 2 to shed more light upon the phylogeography of E. vermiculata in this area. Seventy-seven specimens of land snail Eobania vermiculata were sampled at 19 sampling sites along Croatian coastal region and islands. The partial 16S rRNA gene sequences (379 bp grouped into 14 haplotypes, whereas the partial COI gene sequences (523 bp grouped into 13 haplotypes. The overall population is characterized by relatively high haplotype (gene diversity (0.719±0.042 for 16S rDNA and 0.869±0.020 for COI. Demographic Fu F’s tests and Tajima's D value indicated no significant change in the population size, thus suggesting long historical presence of E. vermiculata in this region. Maximum likelihood phylogenetic analysis, Bayesian inference and median joining haplotype network showed a genetic splitting of Croatian 16S rRNA and COI sequences, with a clear distinction between south-Adriatic and north-Adriatic haplotypes. A possible explanation for the observed phylogeography of E. vermiculata, could be related to the climate change, glaciations and the Adriatic Sea level oscillations during the Quaternary

  2. Fusceulima and Halielloides (Gastropoda: Eulimidae) in the southwestern Atlantic, with descriptions of two new species of Fusceulima

    Scientific Electronic Library Online (English)

    Leonardo Santos de, Souza; Alexandre Dias, Pimenta.

    2014-12-01

    Full Text Available Fusceulima Laseron, 1955 and Halielloides Bouchet & Warén, 1986 are reported from the southwestern Atlantic for the first time. Halielloides ingolfiana Bouchet & Warén, 1986 is considered a valid name, and the taxon is distinct from its previous senior synonym Eulima verrilliana Bush, 1909 in shell [...] shape and absence of an umbilicus. Fusceulima saturata sp. nov. is characterized by a conical shell, domed at the apex, a short ovoid aperture, and a distinct dark-brown spiral band near the suture. Fusceulima toffee sp. nov. also has a conical shell and a dome-shaped apex, but has a taller high aperture and the entire shell is dark brown. Halielloides cf. ingolfiana, Fusceulima cf. boscheineni, and Fusceulima cf. minuta, are here recorded from the continental shelf off southeastern Brazil. The nominal species of these taxa were originally described from the northeastern Atlantic. Their status remains dubious because of lack of information on their biology, anatomy and molecular data. Regarding shell morphology, we cannot distinguish the Brazilian specimens from species in the northeastern Atlantic with the material available. A series of short grooves close to the suture of the protoconch in all species of Fusceulima, including the type species Fusceulima jacksonensis Laseron, 1955, is a possible diagnostic character for this genus.

  3. Chemotoxical effect of the cesium stable isotope on embryogenesis and post embryonic growth of pond snail Lymnaea stagnalis (Gastropoda, Pulmonata)

    International Nuclear Information System (INIS)

    The stable caesium isotope in high concentrations (5 maximum permissible concentrations, MPC) has an lethal influence upon the embryonic development in L. stagnalis. At lower concentrations (0,5 and 1 MPC) survival of embryos in egg massed of specimen from water bodies high levels of radioactive and chemical contamination (the Perstok Lake in Chernobyl nuclear disaster zone and warm effluent channel of Bereza electric power plant) is higher than in those from relatively pure Pripyat River and meliorative channel. Significant differences in growth rates in specimen emerged from these egg masses are absent. (authors)

  4. Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda

    Directory of Open Access Journals (Sweden)

    Nathalie Yonow

    2012-05-01

    Full Text Available Seventy species of opisthobranchs are described in this work based on collections from the Persian Gulf, Socotra, Kenya, Zanzibar, Madagascar, La Réunion, Mauritius, the Seychelles, the Maldives, and Sri Lanka. Ten species are newly recorded from the western Indian Ocean and four species are recorded in the scientific literature for the first time since their original descriptions. Two species are described as new: Cyerce bourbonica sp. n. from La Réand Doriopsilla nigrocera sp. n. from the Persian Gulf coast of Saudi Arabia. Chromodoris cavae is removed from its synonymy with C. tennentana and redescribed from specimens from La Réunion, while several new synonyms are proposed for some commonly occurring species. Risbecia bullockii is recorded for the second time from the Indian Ocean and assigned to its correct genus.

  5. Thais (Stramonita rustica (Lamarck, 1822 (Mollusca: Gastropoda: Thaididae, a potential bioindicator of contamination by organotin northeast Brazil

    Directory of Open Access Journals (Sweden)

    Ítalo Braga de Castro

    2004-06-01

    Full Text Available The use of antifouling paints containing the biocide compound tributyltin (TBT has been shown as an inductor of imposex in neogastropods mollusks. Imposex is characterized by the development of male features in females, mainly the appearance of a no functional vas deferens and penis. Samples of Thais rustica were collected in eight sites in the metropolitan area of Natal city, Rio Grande do Norte state, northeast Brazil, and examined for occurrence of imposex, which was found in many females. The higher imposex levels were presented by samples from sites near city harbor.A utilização de tintas antiincrustrantes contendo o composto biocida tributilestanho (TBT tem induzido moluscos neogastrópodes ao imposex. O imposex é caracterizado pelo surgimento de caracteres sexuais masculinos, sobretudo, pênis e vaso deferente não funcionais em fêmeas desses moluscos. Foram coletadas amostras de Thais rústica em oito estações ao longo da costa da cidade de Natal no Rio Grande do Norte. Esses animais foram analisados quanto a presença e o grau de imposex que apresentavam. Os níveis mais elevados de imposex foram observados na estação mais próxima ao porto.

  6. Re-characterization of the Red-lip Megalobulimus (Gastropoda: Strophocheilidae) from Peru with description of a new species

    Scientific Electronic Library Online (English)

    Victor, Borda; Rina, Ramírez.

    2013-12-01

    Full Text Available Megalobulimus K. Miller, 1878 is a genus of land snails that includes the largest living snails in the Neotropics. The main goal of this paper was to review all species of Megalobulimus that have a red lip, and which are distributed in Peru. We carried out a detailed description of their shells and [...] soft parts, and conducted a multivariate analysis on their shells and geographic distribution. There are two species reported from Peru, Megalobulimus capillaceus (Pfeiffer, 1855) and Megalobulimus separabilis (Fulton, 1903). Megalobulimus capillaceus is known to occur in three regions - San Martín, Huánuco and Cusco - but the Cusco population is undoubtedly different from all remaining populations, and is recognized herein as a new species, Megalobulimus florezi sp. nov. This species has a more elongated shell, penis club-shaped, epiphallus longer, and free oviduct longer than M. capillaceus. By contrast, the male genitalia of M. separabilis is filiform and does not present an external diverticulum in the free oviduct.

  7. Heavy metal levels in Nucella lapillus (gastropoda: prosobranchia) from sites with normal and penis-bearing females from New England

    Energy Technology Data Exchange (ETDEWEB)

    Miller, E.R. III; Pondick, J.S.

    1984-11-01

    Pseudohermaphroditism, as manifested by reproductively normal females possessing non-functioning penises, has been reported for more than thirty species of dioecious neogastropods. This anomaly was shown to be unrelated to age or parasitism, but the geographic distribution of this phenomenon indicated that it was environmentally induced rather than genetically controlled. In a survey of N. lapillus populations along the New England Coast, Pondick found abnormal females at sites directly under the influence of industrial discharges, sewage effluent, or vessel-related activities. Histological sections revealed the presence of a penial duct. The purpose of this study was to determine if there were differences in metal levels in the snail populations studied by Pondick, with particular attention to metals associated with boating activity.

  8. Isolation and characterization of cultivable fermentative bacteria from the intestine of two edible snails, Helixpomatia and Cornu aspersum (Gastropoda: Pulmonata)

    OpenAIRE

    MAR YVONNE CHARRIER; GERARD FONTY; BRIGITTE GAILLARD-MARTINIE; KADER AINOUCHE; GERARD ANDANT

    2006-01-01

    The intestinal microbiota of the edible snails Cornu aspersum fSyn: H. aspersa), and Helix pomatia were investigated by culture-based methods, 16S rRNA sequence analyses and phenotypic characterisations. The study was carried out on aestivating snails and two populations of H. pomatia were considered. The cultivable bacteria dominated in the distal part of the intestine, with up to 5.10(9) CFU g -1, but the Swedish H. pomatia appeared significantly less colonised, suggesting a higher sensitiv...

  9. Isolation and characterization of cultivable fermentative bacteria from the intestine of two edible snails, Helixpomatia and Cornu aspersum (Gastropoda: Pulmonata

    Directory of Open Access Journals (Sweden)

    MAR YVONNE CHARRIER

    2006-01-01

    Full Text Available The intestinal microbiota of the edible snails Cornu aspersum fSyn: H. aspersa, and Helix pomatia were investigated by culture-based methods, 16S rRNA sequence analyses and phenotypic characterisations. The study was carried out on aestivating snails and two populations of H. pomatia were considered. The cultivable bacteria dominated in the distal part of the intestine, with up to 5.10(9 CFU g -1, but the Swedish H. pomatia appeared significantly less colonised, suggesting a higher sensitivity of its microbiota to climatic change. All the strains, but one, shared ? 97% sequence identity with reference strains. They were arranged into two taxa: the Gamma Proteobacteria with Buttiauxella, Citrobacter, Enterobacter, Kluyvera, Obesumbacterium, Raoultella and the Firmicutes with Enterococcus, Lactococcus, and Clostridium. According to the literature, these genera are mostly assigned to enteric environments or to phyllosphere, data in favour of culturing snails in contact with soil and plants. None of the strains were able to digest filter paper, Avicel cellulose or carboxymethyl cellulose (CMC. Acetogens and methanogenic archaea were not cultivated, so the fate of hydrogen remains questionable. This microbiota could play important roles in the digestive process (fermentation and the energy supply of the snail (L-lactate, acetate. The choice of cereals and plants by snail farmers should take into account the fermentative abilities of the intestinal microbiota

  10. Moluscos (Gastropoda e Bivalvia) da reserva natural de usos múltiplos ilha martín garcía, Rio de La Plata: Biodiversidade e ecologia

    OpenAIRE

    II. César; SM Martín; A Rumi; Tassara, M.

    2012-01-01

    The Island of Martin Garcia is located in the Upper Río de la Plata, to the south of mouth the Uruguay River. The aim of the present study was to analyse the biodiversity of the island freshwater mollusks and their relationships to environmental variables. Twelve sampling sites were selected, five were along the littoral section of the island and seven were Inland ponds. Seven major environmental variables were measured: water and air temperature, percentage of oxygen saturation, dissolved o...

  11. Distribution, feeding behavior and control strategies of the exotic land snail Achatina fulica (Gastropoda: Pulmonata) in the northeast of Brazil.

    Science.gov (United States)

    Albuquerque, F S; Peso-Aguiar, M C; Assunção-Albuquerque, M J T

    2008-11-01

    The goal of this study was to document the distribution and establishment A. fulica such as their feeding preference and behavior in situ. The study was carried out at the city of Lauro de Freitas, Bahia state, Brazil, between November 2001 and November 2002. We used catch per unit effort methods to determine abundance, distribution, habitat choice and food preferences. The abundance and distribution of A. fulica was most representative in urban area, mainly near to the coastline. Lots and house gardens were the most preferred sites during active hours. The results indicated that A. fulica started their activity at the end of the evening and stopped in mid-morning. Their preferred food were vascular plants such as Hibiscus syriacus, Ricinus communis, Carica papaya, Galinsonga coccinea, Lippia alba, Ixora coccinea, Musa parasidisiaca, Mentha spicata and Cymbopogon citrates. Our results indicate that A. fulica are well adapted and established in this city and modified environments facilitate their establishment and dispersion. However, human perturbation, such as clearance of lots could be limiting for the persistence of A. fulica populations. PMID:19197503

  12. Systematics and evolution of the Acochlidia (Gastropoda, Euthyneura) - a microanatomical approach by means of 3D reconstruction using Amira

    OpenAIRE

    Neusser, Timea Pamela

    2012-01-01

    Only a small fraction of the estimated species diversity on Earth already has been discovered, and expected high extinction rates force biologists to rapid surveys. Molecular barcoding techniques meet such goals, but taken alone they can hardly connect genetic discoveries with the large morphology-based body of taxonomic knowledge that accumulated during centuries. Also, the study of organismic evolution requires reliable information on phenotypes. Morphological and biological knowledge on fo...

  13. Phylogeography and Genetic Differentiation among Populations of the Moon Turban Snail Lunella granulata Gmelin, 1791 (Gastropoda: Turbinidae).

    Science.gov (United States)

    Chiu, Yuh-Wen; Bor, Hor; Tan, Mian-Shin; Lin, Hung-Du; Jean, Chuen-Tan

    2013-01-01

    We examined the genetic variation and phylogeographic relationships among 10 populations of Lunella granulata from mainland China, Penghu Archipelago, Taiwan Island, and Japan using mitochondrial COI and 16S markers. A total of 45 haplotypes were obtained in 112 specimens, and relatively high levels of haplotype diversity (h = 0.903) and low levels of nucleotide diversity (? = 0.0046) were detected. Four major phylogenetic lineage clusters were revealed and were concordant with their geographic distribution, agreeing with the haplotype network. These results suggested that geographic barrier isolating effects were occurring among the populations. This hypothesis was also supported by a significant genetic differentiation index (FST = 0.709) and by a spatial analysis of molecular variance (SAMOVA) analysis. A mismatch distribution analysis, neutrality tests and Bayesian skyline plots found a single significant population expansion. This expansion occurred on the coast of mainland China before 20-17 ka. Consequently, although the dispersal ability of the planktonic stage and the circulation of ocean currents generally promote genetic exchanges among populations, L. granulata has tended to maintain distinct genetic groups that reflect the respective geographic origins of the constituent lineages. Although the circulation of ocean currents, in principle, may still play a role in determining the genetic composition of populations, long-distance migration between regions is difficult even at the planktonic stage. PMID:23698764

  14. The family Diaphanidae (Gastropoda: Heterobranchia: Cephalaspidea) in Europe, with a redescription of the enigmatic species Colobocephalus costellatus M. Sars, 1870.

    Science.gov (United States)

    Ohnheiser, Lena Tina; Malaquias, Manuel António E

    2014-01-01

    Diaphanidae has traditionally been considered the basal family of the heterobranch gastropod clade Cephalaspidea with 14 species present in Europe ascribed to five genera. The monophyletic status of the family is controversial because of lack of sound synapomorphies. In this paper we present a review of the diversity of Diaphanidae in Europe and give new data on the morphology and anatomy of 50% of the species together with a synopsis of the relevant systematic characters to distinguish between all European species and genera. The rare species Colobocephalus costellatus is redescribed and shown alive for the first time.Further evidence supporting the non-monophyly of Diaphanidae is given; no synapomorphies were found to unite traditional Diaphanidae taxa, but three groups can be recognized: (1) Diaphaninae with genus Diaphana is united by a globose external, thin, and umbilicate shell and radulae with a bilobed rachidian tooth; (2) Toledoniinae, with genera Toledonia and Bogasonia share the presence of a shell with elevated spire and radulae with a unicuspid rachidian tooth; and (3) an unnamed group, with Colobocephalus and Colpodaspis which are the only genera with internal shells, sculptured and globose with short but protruding spires, and radulae lacking rachidian tooth and with smooth hook-shaped lateral teeth. PMID:24871518

  15. Ultrastructure and Glycoconjugate Pattern of the Foot Epithelium of the Abalone Haliotis tuberculata (Linnaeus, 1758) (Gastropoda, Haliotidae)

    OpenAIRE

    Bravo Portela, I.; Martinez-zorzano, V. S.; Molist- Perez, I.; Molist Garci?a, P.

    2012-01-01

    The foot epithelium of the gastropod Haliotis tuberculata is studied by light and electron microscopy in order to contribute to the understanding of the anatomy and functional morphology of the mollusks integument. Study of the external surface by scanning electron microscopy reveals that the side foot epithelium is characterized by a microvillus border with a very scant presence of small ciliary tufts, but the sole foot epithelium bears a dense field of long cilia. Ultrastructural examinatio...

  16. Putative midkine family protein up-regulation in Patella caerulea (Mollusca, Gastropoda) exposed to sublethal concentrations of cadmium

    Energy Technology Data Exchange (ETDEWEB)

    Vanucci, Silvana [Department of Animal Biology and Marine Ecology, University of Messina, Salita Sperone 31, 98166 S Agata, Messina (Italy)]. E-mail: silvana.vanucci@unime.it; Minerdi, Daniela [Department of Animal Biology and Genetics, University of Florence, via Romana 19, 50125 Florence (Italy); Kadomatsu, Kenji [Department of Biochemistry, University of Nagoya Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550 (Japan); Mengoni, Alessio [Department of Animal Biology and Genetics, University of Florence, via Romana 19, 50125 Florence (Italy); Bazzicalupo, Marco [Department of Animal Biology and Genetics, University of Florence, via Romana 19, 50125 Florence (Italy)

    2005-11-30

    A cDNA sequence of a putative midkine (MK) family protein was identified and characterised in the mollusc Patella caerulea. The midkine family consists of two members, midkine and pleiotrophin (PTN), and it is one of the recently discovered cytokines. Our results show that this putative midkine protein is up-regulated in specimens of P. caerulea exposed to sublethal cadmium concentrations (i.e. 0.5 and 1 mg l{sup -1} Cd) over a 10-day exposure period. Semiquantitative RT-PCR and quantitative Real time RT-PCR estimations indicate elevated expression of midkine mRNA in exposed specimens compared to controls. Moreover, RT-PCR Real time values were higher in the viscera (here defined as the part of the soft tissue including digestive gland plus gills) than in the foot (i.e. foot plus head plus heart) of the limpets. At present, information on the functional signalling significance of the midkine family proteins suggests that the up-regulation of P. caerulea putative midkine family protein is a distress signal likely with informative value on health status of the organism and with potential prognostic capability.

  17. New records of Omalonyx matheroni (Pontiez & Michaud, 1835 (Mollusca, Gastropoda, Succineidae for the São Paulo and Paraná States.

    Directory of Open Access Journals (Sweden)

    Maria Cristina Dreher Mansur

    2009-06-01

    Full Text Available Omalonyx matheroni is a succineid gastropod that lives on aquatic macrophytes and on emergent vegetation in the wetlands of inner deltas, lakes and dikes. Occurrences of this species were recorded in the municipalities of Ibitinga (SP and Paranaguá (PR, broadening its distribution southwards in South America. Until now this species had been recorded in Demerara (Guiana, Zanderij and Belwaarde (Suriname, Guiana Francesa, Peru, Limoncocha (Equador, Amazonas, Pará, Pernambuco, Rio de Janeiro and Minas Gerais (Brazil, as well as on the islands of Guadalupe and Trinidade.

  18. First report of Angiostrongylus cantonensis (Nematoda: Metastrongylidae) in Achatina fulica (Mollusca: Gastropoda) from Southeast and South Brazil

    Scientific Electronic Library Online (English)

    Arnaldo, Maldonado Júnior; Raquel O, Simões; Ana Paula M, Oliveira; Esther M, Motta; Mônica A, Fernandez; Zilene M, Pereira; Simone S, Monteiro; Eduardo J Lopes, Torres; Silvana Carvalho, Thiengo.

    2010-11-01

    Full Text Available The rat lungworm Angiostrongylus cantonensis is a worldwide-distributed zoonotic nematode that can cause human eosinophilic meningoencephalitis. Here, for the first time, we report the isolation of A. cantonensis from Achatina fulica from two Brazilian states: Rio de Janeiro (specifically the munici [...] palities of Barra do Piraí, situated at the Paraiba River Valley region and São Gonçalo, situated at the edge of Guanabara Bay) and Santa Catarina (in municipality of Joinville). The lungworms were identified by comparing morphological and morphometrical data obtained from adult worms to values obtained from experimental infections of A. cantonensis from Pernambuco, Brazil, and Akita, Japan. Only a few minor morphological differences that were determined to represent intra-specific variation were observed. This report of A. cantonensis in South and Southeast Brazil, together with the recent report of the zoonosis and parasite-infected molluscs in Northeast Brazil, provide evidence of the wide distribution of A. cantonensis in the country. The need for efforts to better understand the role of A. fulica in the transmission of meningoencephalitis in Brazil and the surveillance of molluscs and rodents, particularly in ports, is emphasized.

  19. Keeping Nerves: Central Nervous System of the Interstitial Acochlidiid Parhedyle cryptophthalma (Gastropoda, Opisthobranchia)

    DEFF Research Database (Denmark)

    Joerger, Katharina; Kristof, Alen

    2008-01-01

    Unusually well-preserved fossils of a Halicyne-like cycloid crustacean frequently occur in the early Late Triassic lacustrine clay bed at Krasiejów in Opole Silesia, southern Poland. Its gill-like structures form a horseshoe-shaped pair of units composed of numerous calcified blades with reverse U-shaped cross-section. Originally, these were parallel slits opening on the ventral surface of the carapace. Lobation of the posterior margin of the carapace, of unusually large mature size for the group, make the animal different from other members of Halicynidae, and the new name Opolanka decorosa gen. et sp. nov. is proposed for it. More completely preserved specimens of cycloids from Vosges, France, and Madagascar show that the slit openings were located above radially arranged coxae of the walking appendages and a reduced abdomen. The disposition and arrangement of the cycloid gills suggest at least close analogy, and possibly homology, with the respiratory areas of the Branchiura, serving mostly as ion-exchangeorgans. It is proposed that they originated, in connection with the body size increase and adaptation to fresh-water environment, as radially arranged infoldings of the respiratory areas cuticle, with strongly calcified rigid dorsal parts suspended from the carapace. At least three ecologically and anatomically distinct lineages were represented in the order Cyclida, which was probably initially confined to marine environments and gradually adapted to life in continental waters. New taxa Schraminidae fam. nov. (with Schramine gen. nov.) and Americlidae fam. nov. (with Americlus gen. nov.) are proposed. J. Morphol., 2008. © 2008 Wiley-Liss, Inc.

  20. Konchologické nálezy (Mollusca: Gastropoda et Bivalvia) z ran? st?edov?kých objekt? v Žalov? u Prahy.

    Czech Academy of Sciences Publication Activity Database

    Hlavá?, Jaroslav

    Vol. 1. Praha : Archeologický ústav AV ?R, 2012 - (Tomková, K.), s. 342-347 ISBN 978-80-87365-48-9 R&D Projects: GA AV ?R IAAX00020701 Institutional research plan: CEZ:AV0Z30130516 Keywords : Middle Ages * Mollusca * cauri * molluscs Subject RIV: EG - Zoology

  1. DNA multigene sequencing of topotypic specimens of the fascioliasis vector Lymnaea diaphana and phylogenetic analysis of the genus Pectinidens (Gastropoda)

    Scientific Electronic Library Online (English)

    Maria Dolores, Bargues; Roberto Luis, Mera y Sierra; Patricio, Artigas; Santiago, Mas-Coma.

    2012-02-01

    Full Text Available Freshwater lymnaeid snails are crucial in defining transmission and epidemiology of fascioliasis. In South America, human endemic areas are related to high altitudes in Andean regions. The species Lymnaea diaphana has, however, been involved in low altitude areas of Chile, Argentina and Peru where h [...] uman infection also occurs. Complete nuclear ribosomal DNA 18S, internal transcribed spacer (ITS)-2 and ITS-1 and fragments of mitochondrial DNA 16S and cytochrome c oxidase (cox)1 genes of L. diaphana specimens from its type locality offered 1,848, 495, 520, 424 and 672 bp long sequences. Comparisons with New and Old World Galba/Fossaria, Palaearctic stagnicolines, Nearctic stagnicolines, Old World Radix and Pseudosuccinea allowed to conclude that (i) L. diaphana shows sequences very different from all other lymnaeids, (ii) each marker allows its differentiation, except cox1 amino acid sequence, and (iii) L. diaphana is not a fossarine lymnaeid, but rather an archaic relict form derived from the oldest North American stagnicoline ancestors. Phylogeny and large genetic distances support the genus Pectinidens as the first stagnicoline representative in the southern hemisphere, including colonization of extreme world regions, as most southern Patagonia, long time ago. The phylogenetic link of L. diaphana with the stagnicoline group may give light to the aforementioned peculiar low altitude epidemiological scenario of fascioliasis.

  2. Metamorphosis Induction of the Dog Conch Strombus canarium (Gastropoda: Strombidae Using Cues Associated with Conch Nursery Habitat

    Directory of Open Access Journals (Sweden)

    Z.C. Cob

    2010-01-01

    Full Text Available Strombus canarium is a commercially important gastropod that has great potential for advancement into aquaculture. In this study, the metamorphosis response of Strombus canarium larvae to various metamorphosis cues associated with conch nursery habitat and to KCl and GABA, were tested. Bioassays were run as static, no choice experiment and adopting a continuous exposure approach. Strombus canarium larvae showed strong metamorphosis responses when sediment (i.e., conch nursery habitat sediment/SD-NU and detrital substrata (i.e., Thalassia detritus leachate/T-LC from their nursery habitat were used (p<0.05. There was no metamorphosis in treatments using sterilized conch nursery habitat sediment (SD-ST and sediment taken from outside conch nursery habitat (SD-OT. Experiments using fresh macrophyte blades of Enhalus acoroides (EA, Thalassia hemprichii (TH, Halophila ovalis (HA and Ulva (UL and adult conditioned seawater (SD-SW also showed negative respond. Conch larvae demonstrate active habitat selection during metamorphosis and no spontaneous metamorphosis was observed. Settlement in S. canarium is associative in nature where epibionts associated with conch nursery habitat could be the cue for the metamorphosis. However, the specific epibionts/inducers and mechanisms underlining the process were not studied and therefore are subjected to more detailed investigation. The use of KCl was comparable with treatments using natural inducers (SD-NU and T-LC, thus was suggested for application in hatchery spat production of the species.

  3. The Japanese oyster drill Ocinebrellus inornatus (Récluz, 1851) (Mollusca, Gastropoda, Muricidae), introduced to the Limfjord, Denmark

    DEFF Research Database (Denmark)

    Lützen, JØrgen; Faasse, Marco

    2012-01-01

    The predatory neogastropod Ocinebrellus inornatus was first reported from Europe in W France in 1995 and has since been detected at other sites in NW and N France and The Netherlands. It is native to the North Pacific where it preys on the Pacific oyster Crassostrea gigas. Here we report on the occurrence of the species in beds of European oysters (Ostrea edulis) in the Limfjord, NW Jutland, Denmark. The morphology-based identification has been confirmed by genetic analysis. The species was probably introduced with oysters imported from France in the 1970s and 1980s. The invasion is still relatively localized but as the species has established a reproductive population, it may eventually spread to other parts of the fjord and in time pose a problem to the oyster fishery. The species’ invasion history is reviewed.

  4. Imposex induction in Stramonita haemastoma floridana (Conrad, 1837) (Mollusca: Gastropoda: Muricidae) submitted to an organotin-contaminated diet

    Scientific Electronic Library Online (English)

    Aline Fernandes Alves de, Lima; Ítalo Braga de, Castro; Cristina de Almeida, Rocha-Barreira.

    2006-03-01

    Full Text Available Organismos marinhos são afetados por compostos organoestânicos que causam uma série de efeitos deletérios aos mesmos. O mais conhecido efeito da contaminação por organoestânicos é o imposex. Esse fenômeno consiste na masculinização de fêmeas de moluscos neogastrópodes tais como Stramonita haemastoma [...] floridana. Esses compostos tendem a se acumular em moluscos devido a sua baixa capacidade de eliminá-los. Um total de 248 indivíduos de S. haemastoma floridana foram coletados de uma população livre qualquer indício de imposex. Esses animais foram mantidos em 7 aquários, com aproximadamente 30 indivíduos cada, 1 desses aquários foi considerado como controle e os animas do mesmo alimentados com ostras obtidas de locais onde não se verificou a ocorrência de imposex em neogastrópodes nativos. Os animais nos outros 6 aquários foram alimentados com ostras obtidas em local onde a incidência de imposex entre os gastrópodes nativos revelou-se muito alta. A cada 15 dias, por um período total de 90 dias, os animais de um dos tanques eram retirados e analisados quanto à presença de imposex. Os níveis de imposex foram quantificados através da % de imposex e dos índices: RPLI, RPSI e VDSI. Observou-se a indução de imposex em S. haemastoma floridana através da dieta a partir de Crassostrea rhizophora e um aumento significativo dos índices com o decorrer do tempo de exposição. Os animais do aquário controle foram analisados ao fim do experimento não revelando qualquer indício de imposex. Abstract in english Marine organisms are affected by organotin compounds due to the cumulative, deleterious effects of these latter. The most evident and well known consequence of organotin contamination is imposex, a hormonal disruption that causes a superimposition of sexual male features in females of prosobranchia [...] neogastropod molluscs such as Stramonita haemastoma floridana. Molluscs accumulate organotins mainly because of their poor ability to eliminate TBT and DBT from their tissues. The aim of this study was to analyze organotin uptake by ingestion experimentally, using uncontaminated subjects (S. haemastoma floridana) fed with organotin-contaminated oysters (Crassostrea rhizophorae). A total of 248 gastropods, distributed in 7 tanks with uncontaminated water and contaminated food, were used in this study, a control group being fed uncontaminated oysters. Every 15 days, the individuals of one of the tanks were examined for the presence of imposex. Development of imposex was measured using the VDSI, RPSI and RPLI indexes. The animals had already developed imposex within the first 15 days, all the indexes measured (RPLI, RPSI and VDSI) having increased significantly with duration of exposure, indicating that the animals were probablycontaminated by the food and had accumulated the pollutant. New paths of imposex development were also observed.

  5. Morphology of the shell of Happiella cf. insularis (Gastropoda: Heterobranchia: Systrophiidae) from three forest areas on Ilha Grande, Southeast Brazil

    Scientific Electronic Library Online (English)

    Amilcar Brum, Barbosa; Sonia Barbosa dos, Santos.

    2014-06-01

    Full Text Available We conducted a study on shell morphology variation among three populations of Happiella cf. insularis (Boëttger, 1889) inhabiting different areas (Jararaca, Caxadaço, and Parnaioca trails) at Vila Dois Rios, Ilha Grande, Angra dos Reis, state of Rio de Janeiro, Brazil. Linear and angular measurement [...] s, shell indices representing shell shape, and whorl counts were obtained from images drawn using a stereomicroscope coupled with a camera lucida. The statistical analysis based on ANOVA (followed by Bonferroni's test), Pearson's correlation matrix, and discriminant analysis enabled discrimination among the populations studied. The variable that most contributed to discriminate among groups was shell height. Mean shell height was greatest for specimens collected from Jararaca, probably reflecting the better conservation status of that area. Good conservation is associated with enhanced shell growth. Mean measurements were smallest for specimens from Parnaioca, the most disturbed area surveyed. Mean aperture height was smallest for specimens from Parnaioca, which may represent a strategy to prevent excessive water loss. Discriminant analysis revealed that the snails from Jararaca differ the most from snails collected in the two other areas, reflecting the different conservation status of these areas: shells reach larger sizes in the localities where the humidity is higher. The similarities in shell morphology were greater between areas that are more similar environmentally (Caxadaço and Parnaioca), suggesting that conchological differences may correspond to adaptations to the environment.

  6. Relation between aquatic plants and gastropods (Mollusca, Gastropoda) in the region of Gentilly I (Quebec) nuclear generating station

    International Nuclear Information System (INIS)

    This study is based on a sampling of the gastropods present in the vegetation of the St. Lawrence riverside zone at Gentilly. A total of 536 plant specimens belonging to 20 species as well as 37 239 specimens grouping 10 different species of gastropods were sampled. A comparison of the plant species - mollusc data was carried out. The analysis of the results indicates that prosobranchs have no affinity whatsoever for any plant species in particular. The pulmonates, however, are found mainly on emergent plants. (author)

  7. Occurrence of Elysia grandifolia (Mollusca, Gastropoda), and its radionuclide content from Tarapur coastal waters, west coast of India

    International Nuclear Information System (INIS)

    Occurrence, morphological features, feeding habits, metal and radionuclide content of an opisthobranch sacoglossan Elysia grandifolia Kelaart have been reported. Mn was highest in E.grandifolia whereas Zn was most abundant in eggs. Radionuclide 131I was most abundant in tissues 1.4 Bq g-1 dry weight and in eggs 0.8 Bq g-1 dry weight. Radionuclide 60Co in eggs was, 1.0 Bq g-1 dry weight and in tissues, 0.08 Bq g-1 dry weight. Possibility of using the species and eggs as indicators for 131I and 60Co radionuclides in the marine environment is discussed. (author). 12 refs., 2 figs

  8. Two new and rare mountain door-snails (Gastropoda, Pulmonata, Clausiliidae) from high mountain areas in Macedonia

    OpenAIRE

    Ivailo Dedov

    2012-01-01

    Two species of Clausiliidae are described as new to science. Euxinella alpinella sp. n. is the fourth species within genus Euxinella Nordsieck, 1973, and Vestia lazarovii sp. n. is the second species of genus Vestia recorded from the Republic of Macedonia. In both species, the clausilium apparatus shows a high degree of variation.

  9. Gigantobilharzia melanoidis n.sp. (Trematoda: Schistosomatidae) from Melanoides tuberculata (Gastropoda: Thiaridae) in the United Arab Emirates.

    Science.gov (United States)

    Schuster, Rolf K; Aldhoun, Jitka A; O'Donovan, Declan

    2014-03-01

    Delicate filamentous schistosomatids detected in the intestinal veins of experimentally infected chickens are here described as a new parasite species, Gigantobilharzia melanoidis, and details of its life cycle are given. It is the first complete description of a schistosome species that uses Melanoides tuberculata as an intermediate host. Apharyngeate ocellate brevifurcate cercariae found in 65 out of 950 M. tuberculata collected in a pond in Al Aweer, United Arab Emirates were used as infection material. The new species can be distinguished from the other species of the genus by the following combination of characters: caecal reunion in males situated anterior to seminal vesicle, a very short gynecophoric canal (gynecophoric canal length/body length ratio lower than 0.05) supported by 12-14 thickened bands. Cercariae of G. melanoidis can be distinguished from other Gigantobilharzia cercariae described in the literature based on the combination of these characters: flame cell formula 2[3 + 3 + (1)] = 14 and relatively longer tail stem in relation to body (tail stem length/body length ratio = 2). Under laboratory conditions at a temperature between 24 and 26 °C, M. tuberculata started to shed cercariae 7 weeks after exposure to miracidia. The prepatent period of G. melanoidis in experimentally infected chicken lasted between 43 and 49 days. The parasite inhabits the blood vessels mainly of the small intestine. Sections of adult worms and eggs were also found in histocuts of parenchymatous organs. Results of phylogenetic analysis corroborated that G. melanoidis is a distinct species; however, they also confirmed that the genus Gigantobilharzia is in need of revision and in future might be split into several genera. PMID:24322292

  10. Distribución y abundancia de Melanoides tuberculata (Gastropoda: Thiaridae en la Reserva de la Biosfera Pantanos de Centla, Tabasco, México

    Directory of Open Access Journals (Sweden)

    Natalia C. ALBARRAN-MELZE

    2009-01-01

    Reserva durante la época de lluvias (septiembre y octubre 2003 y en la época de estiaje (abril y mayo 2004. Para conocer el patrón de distribución espacial se utilizaron índices de agregación: Índice de Morisita (I¿ y Parámetro k. Se encontró la presencia de esta especie en 18 de las lagunas muestreadas. Se recolectaron 13,597 individuos. La mayor abundancia se presentó en la época de lluvias (8,364 individuos. Las poblaciones en cada laguna presentaron un patrón de distribución espacial agregado. Durante la época de lluvias se encontró una correlación inversa entre la abundancia y demanda química de oxígeno y directa con nitratos, y en la de estiaje inversa entre la abundancia y salinidad y directa con nitratos, nitritos y potencial de hidrógeno.

  11. Postembryonic stages of Nucellicola holmanae Lamb et al., 1996 (copepoda, poecilostomatoida), an endoparasite of the dog whelk Nucella lapillus (gastropoda)

    Science.gov (United States)

    Lamb, E. J.; Boxshall, G. A.; Mill, P. J.; Grahame, J.

    1998-06-01

    The external morphology of the first three larval stages of Nucellicola holmanae is described. These stages were cultured from eggs found with the adults in the viscera of dog whelks collected from Robin Hood's Bay, North Yorkshire. The nauplius develops within the whelk. It moults to a metanauplius which is released as a free-swimming stage. The metanauplius moults to a free copepodid stage which exhibits a combination of characters typical of the first, second and third copepodid stages of other poecilostomatoid copepods. The infective copepodid stage which locates and penetrates the host is visible through the integument of this free-swimming copepodid.

  12. Effects of endocrine disruptors on prosobranch snails (Mollusca: Gastropoda) in the laboratory. Part II: Triphenyltin as a xeno-androgen.

    Science.gov (United States)

    Schulte-Oehlmann, U; Tillmann, M; Markert, B; Oehlmann, J; Watermann, B; Scherf, S

    2000-12-01

    In laboratory experiments the effects of suspected endocrine disrupting chemicals on freshwater and marine prosobranch species were analysed. In this second of three publications the responses of the freshwater ramshorn snail Marisa cornuarietis and of two marine prosobranchs (the dogwhelk Nucella lapillus and the netted whelk Hinia reticulata) to the xeno-androgenic model compound triphenyltin (TPT) are presented. Marisa and Nucella were exposed via water (nominal concentrations 5-500 ng TPT-Sn/L) and Hinia via sediments (nominal concentrations 50-500 micrograms TPT-Sn/kg dry wt.) for up to 4 months. Female ramshorn snails but not the two marine species developed imposex in a time and concentration dependent manner (EC10 4 months: 12.3 ng TPT-Sn/L) with a comparable intensity as described for tributyltin. TPT reduced furthermore the fecundity of Marisa at lower concentrations (EC10 4 months: 5.59 ng TPT-Sn/L) with a complete inhibition of spawning at nominal concentrations > or = 250 ng TPT-Sn/L (mean measured +/- SD: > or = 163 +/- 97.0 ng TPT-Sn/L). The extension of the pallial sex organs (penis with accessory structures and prostate gland) of male ramshorn snails and dogwhelks were reduced by up to 25% compared to the control but not in netted whelks. Histopathological analyses for M. cornuarietis and H. reticulata provide evidence for a marked impairment of spermatogenesis (both species) and oogenesis (only netted whelks). The test compound induced a highly significant and concentration independent increase in the incidence of hyperplasia on gills, osphradia and other organs in the mantle cavity of N. lapillus indicating a carcinogenic potential of TPT. The results show that prosobranchs are sensitive to endocrine disruption at environmentally relevant concentrations of TPT. Also, M. cornuarietis is a promising candidate for a future organismic invertebrate system to identify endocrine-mimetic test compounds. PMID:11214444

  13. Effects of endocrine disruptors on prosobranch snails (Mollusca: Gastropoda) in the laboratory. Part III: Cyproterone acetate and vinclozolin as antiandrogens.

    Science.gov (United States)

    Tillmann, M; Schulte-Oehlmann, U; Duft, M; Markert, B; Oehlmann, J

    2001-12-01

    The effects of suspected endocrine disrupting chemicals on freshwater and marine prosobranch species were analysed in laboratory experiments. In this last of three publications, the responses of the fresh water snail Marisa cornuarietis and of two marine prosobranchs (Nucella lapillus, Nassarius (Hinia) reticulatus) to the antiandrogenic model compounds cyproterone acetate (CPA) and vinclozolin (VZ) are presented. The snails were exposed to nominal CPA concentrations of 1.25 mg/L alone and simultaneously to a potent synthetic estrogen (ethinylestradiol), androgen (methyltestosterone) or an indirectly acting xeno-androgen (tributyltin) in experiments with adult specimens and in a life cycle test for 12 months. Marisa and Nucella were furthermore exposed to nominal concentrations of 0.03-1.0 microgram VZ/L for up to 5 months. The antiandrogens induced a number of biological responses in all three species. The length of the penis and of accessory male sex organs (e.g., penis sheath, prostate) were significantly reduced. For Marisa, this effect occurred only in sexually immature specimens and was reversible as the males attained puberty. Typical androgen-mediated responses (imposex development, delayed spermatogenesis, tubulus necrosis of the testis with orchitis and Leydig cell hyperplasia) were partially or totally suppressed by a simultaneous administration of CPA. In the two marine species even adult, sexually mature males responded to antiandrogens with a reduction of the male sex organs and an advancement of the sexual repose phase. The results for CPA and VZ are compared with the effects of an exposure to xeno-estrogens (bisphenol A, octylphenol) and xeno-androgens (triphenyltin, tributyltin) in the same species. Each group of endocrine disruptors induces a characteristic set of toxicological effects in prosobranch snails which can be used as endpoints in an organismic invertebrate test for the identification of endocrine mimetic test compounds. Estrogens cause primarily an induction of superfemales resulting in an increased female mortality by the enhancement of spawning mass and egg production. The main effects of androgens are a virilization of females by imposex development and a marked decrease of the fecundity. Compared with estrogens and androgens, the antiandrogen responses seem to be less drastic and might have--in contrast to the two other disruptor classes--no biologically significant effects at the population level. PMID:11759570

  14. The impact of tributyltin (TBT) pollution on the Nucella lapillus (Gastropoda) populations around the coast of South-East England

    OpenAIRE

    GIBBS, P.; Bryan, G.; Spence, S

    1991-01-01

    A survey of the Nucella lapillus populations around South-East England in November 1987 revealed imposex to be well developed in all areas. Population abundance of N. lapillus appeared unaffected at few localities; generally the syndrome was sufficiently advanced to cause sterility and population decline, notably in the Brighton-Newhaven area. The worst affected region appeared to be North Kent where the species was found to have disappeared entirely. TBT pollution, a well established cause o...

  15. Age, Growth, Mortality and Population Structure of Strombus canarium (Gastropoda: Strombidae: Variations in Male and Female Sub-Populations

    Directory of Open Access Journals (Sweden)

    Z.C. Cob

    2009-01-01

    Full Text Available The age, growth, mortality and population structure of Strombus canarium Linnaeus, 1758 were examined in the Johor Straits, Malaysia from January to December 2005. A total of 2088 conchs were sampled where females were more abundant than males with monthly sex ratio of 1.72±0.17 (N = 12. The estimated growth parameter showed higher asymptotic length (L? and growth coefficient (K in females (L? = 70.20 mm, K = 1.50 year-1 compared with the males (L? = 69.30 mm, K = 1.20 year-1. This resulted in better overall growth performance of females (?’ = 3.81 compared with the males (?’ = 3.48. The growth pattern of females and males showed positive allometric nature of growth (b>3, p<0.05, with estimated maximum life span of 2.0 and 2.5 year, respectively. The recruitment pattern was continuous, displaying only a single major peak event per year. The estimated natural mortality rate (M was 0.95 year-1 in females and 0.86 year-1 in males, while the total mortality rate (Z was 2.56 and 2.72 year-1, respectively. The fishing mortality rate (F was 1.61 year-1 in females and 1.86 year-1 in males, which were higher than the natural mortality rates, thus indicating an unbalanced position of the stock. In addition, the exploitation rate (E was higher than the maximum allowable limit of exploitation (EMSY, which was a further indication of overexploitation. For sustainable utilization of the resource, serious efforts should immediately be taken in reducing the exploitation rates of S. canarium in the study area.

  16. Dynamics and ecology of an Indo-Pacific conch,Conomurex persicus (Mollusca: Gastropoda) in southeastern Turkey

    Scientific Electronic Library Online (English)

    Erhan, Mutlu; Mehmet, Betil Ergev.

    2006-03-01

    Full Text Available El gastrópodo tropical Conomurex persicurs, ha sido introducido a una región subtropical, el noreste del Mar Mediterráneo, y ha invadido los fondos arenosos en un rango de profundidad de 1 a 10 m. Se estudiarion las dinámicas poblacionales a partir de especímenes recolectados mediante un dragado est [...] ándard (60 x 15 cm de apertura de entrada y 0.5 x 0.5 cm de tramado). Muestras de C. persicus fueron recolectadas mensualmente a produndidades de 5 y 10 m en las cercanías de Erdemil, Mersin, Turkey, en los meses de febrero y mayo del año 2000. La densidad dentro de un mismo año depende de los niveles de salinidad, mientras que al comparar años distintos está correlacionada con la temperatura del agua. Abstract in english Conomurex persicus, one of the tropical conchs, has been introduced to one of the subtropical regions, the northeastern Mediterranean Sea, and invaded sandy bottoms between 1 and 10 m deep. Population dynamics were studied from specimens collected with a standard dredge (60 x 15 cm mouth opening, 0. [...] 5 x 0.5 cm eye opening of net). Samples of C. persicus were collected monthly along the 5 and 10 m depth contours off Erdemli, Mersin, Turkey, in February and May 2000. Intra-annual density depended on salinity levels, while inter-annual density was correlated with bottom water temperature. Specimens underwent spring emergences and winter burial and sheltering (disappearance). Emergence took place in March when temperatures rose and the disappearance occurred in October-November when temperatures dropped. Adults live at 10 m, juveniles are recruited at a 5 m depth. Recruitment began in April and continued for the next 6 months. In contrast to shell width or shell lip thickness, shell length was not a convenient index for estimation of growth parameters. Annual production and mortality were calculated to be 7.86 g m-2 and 3.80 g m-2, respectively, in April-November. Rev. Biol. Trop. 54 (1): 117-129. Epub 2006 Mar 31.

  17. Effects of environmental concentrations of atrazine on hemocyte density and phagocytic activity in the pond snail Lymnaea stagnalis (Gastropoda, Pulmonata)

    International Nuclear Information System (INIS)

    Immunotoxicological effects of environmentally relevant concentrations (10, 23, 50, 100 ?g/l) of atrazine were studied in Lymnaea stagnalis. Individual hemolymph sampling was performed at 0, 24, 48, 72, 96, 168, 336, 504 and 672 h during exposure. Every atrazine concentration induced a significant increase in the mean number of circulating hemocytes, without any concentration-response relation. A peak (1.6-fold increase) of hemocyte density was observed after 96 h of exposure. After 504 h, the number of hemocytes remained higher only in the snails exposed to the two highest concentrations. Granulocytes contributed most to the increase in hemocyte density in herbicide-exposed snails. Both short- (24 and 96 h) and long-term (504 h) exposures resulted in significant inhibition of hemocyte phagocytic activity upon E. coli. Over the long-term, phagocytosis recovered for the two lowest concentrations. After 504 h of exposure, every herbicide level resulted in a significant reduction of reactive oxygen species production in E. coli-stimulated hemocytes, which was not observed for short-term exposures. - Phagocytosis and oxidative burst of hemocytes may be a functional biomarker for atrazine effects on snails

  18. Hábitos de Vida dos Gastropoda e Bellerophontida da Formação Maecuru,Devoniano Médio, Bacia do Amazonas, Brasil

    Directory of Open Access Journals (Sweden)

    Luiza Corral Martins de Oliveira Ponciano

    2007-07-01

    Full Text Available The Maecuru Formation comprises the Devonian-Carboniferous sedimentary sequence of Amazonas Basin and consists of fluvialdeltaics and pelites layers. Its fossiliferous sediments (the uppermost part of the Lontra Member consists of hummocky cross-stratified fine-grained to very coarse sandstones beds.With the purpose of adding more information about the palaeoecology of The Maecuru Formation fossils, the life habits of gastropods and bellerophontids were inferred based on functional analysis and similarities with the living forms. The more significant features used were: (1 total frontal cross-sectional area, (2height and relative positions of pressure point and center of gravity, (3 apertural margin morphology, (4 kind of symmetry and (5surface smoothness. The species Platyceras (Orthonychia steinmanni; Platyceras (Tumbophalus hartti; Platyceras (Platyostomadarwini; Platyceras (Platyostoma (? agassizi; Platyceras (Orthonychia meerwarthi; Platyceras (Orthonychia gracilis; Platyceras (Tumbophalus coutoanus; “Platyceras” tschernischewi; “Platyceras” subconicum; “Platyceras” (Ortonychia hussaki; “Platyceras” (Ortonychia whitii; “Platyceras” (Ortonychia whitii var. curua and “Platyceras” symmetricum var. maecuruensis represent the epifaunal gastropods with low mobility (coprophagous/suspension feeders of the Maecuru Formation, living symbiotically directly over the anus of a crinoid or nearby. This coprophagous mode of life was probably a non-obligate relationship, because only the closest organisms will get all the advantages of using the crinoid host as a nutrient source. The others adult platyceratids would have a broader feeding repertoire, like as suspension feeders. The bellerophonts Plectonotus (Plectonotus derbyi, Plectonotus (? (Plectonotus salteri e Bucanella reissi would have an epifaunal medium to high mobility, showing a predator habit preferably. On the other hand Bucania freitasi, Ptomatis forbesi and Bellerophon steltzneri showed morphologies compable to a grazer habit with medium mobility. This relative high diversity of gastropods and bellerophonts corroborates the environment of medium and inner shelf inferred for the Maecuru Formation among the others macrofossils, since the majority of Paleozoic fauna of gastropods were typically from shallow seas.

  19. Distribution of Bithynia leachii (Sheppard, 1823 and Bithynia troschelii (Paasch, 1842 (Gastropoda: Bithyniidae in the Czech Republic

    Directory of Open Access Journals (Sweden)

    Luboš Beran

    2009-04-01

    Full Text Available This paper summarises all known data about the occurrence and distribution of Bithynia leachii (Sheppard, 1823 and Bithynia troschelii (Paasch, 1842 in the Czech Republic. Both species were already recorded from the Czech Republic in the past, but they were not distinguished. Autochthonous occurrence of both species is restricted to South Moravia; in the floodplains along the Morava River and the Dyje River where both species are very rare. Bithynia troschelii was also found in other sites situated in Bohemia and northern Moravia but these occurrences are not indigenous.

  20. Influence of joint application of heavy metals on level of each metal accumulated in the periwinkle Tympanotonus fuscatus (Gastropoda: Potamididae)

    International Nuclear Information System (INIS)

    Most laboratory assessments on toxicity and bioaccumulation of heavy metals have been concentrated on the accumulation of these metal ions when exposed singly to the test organisms. However, under the natural environmental settings, the metals are never present in isolation and may interact with each other, therefore justifying the need to study the influence of joint application of metals on accumulated levels in exposed animals. In this study, exposure of the periwinkle Tympanotonus fuscatus to sublethal concentrations (equivalent to 0.1 and 0.01 of 96 h LC50) of heavy metals revealed that they were bioaccumulative varying amounts, depending on the type of metal, exposure period and concentration in the test media. while Zn and Pb ions accumulation increased steadily with exposure time, the amounts of Cu accumulated fluctuated regularly over the 30-day experimental period. The levels of Zn, Cu and Cd bioaccumulated over the 30-day experimental period were reduced by over 2-6 folds (with bioaccumulation radio values ranging from 0.15 to 0.81) when compared to concentrations of the respective metals accumulated during single bioaccumulation studies. However, Pb concentrations accumulated during the joint action studies increased nearly 2-fold (bioaccumulation ratio range 1.36 to 2.0-fold). (author)

  1. Hemocyte-specific responses to the peroxidizing herbicide fomesafen in the pond snail Lymnaea stagnalis (Gastropoda, Pulmonata)

    Energy Technology Data Exchange (ETDEWEB)

    Russo, Jacqueline [UMR 6553 Ecobio CNRS Universite de Rennes 1, Campus de Beaulieu, F-35042 Rennes cedex 35042 (France); Lefeuvre-Orfila, Luz [UMR 985 INRA-Agrocampus Ecobiologie et Qualite des Hydrosystemes Continentaux, Equipe Ecotoxicologie et Qualite des Milieux aquatiques, 65 rue de Saint-Brieuc CS 84215, F-35042 Rennes cedex 35042 (France); Lagadic, Laurent [UMR 985 INRA-Agrocampus Ecobiologie et Qualite des Hydrosystemes Continentaux, Equipe Ecotoxicologie et Qualite des Milieux aquatiques, 65 rue de Saint-Brieuc CS 84215, F-35042 Rennes cedex 35042 (France)]. E-mail: laurent.lagadic@rennes.inra.fr

    2007-03-15

    Responses of circulating hemocytes were studied in Lymnaea stagnalis exposed to 10, 30, 90, and 270 {mu}g/L fomesafen for 24 and 504 h. Flow cytometry was used to quantify fomesafen-induced production of reactive oxygen species (ROS), phagocytic activity on Escherichia coli, and oxidative burst when hemocytes were challenged by E. coli or phorbol 12-myristate-13-acetate (PMA). Lysosomal membrane damage was assessed, using the neutral-red retention time (NRRT) assay. Exposure to fomesafen for 24 h resulted in increase in ROS levels and decreases in phagocytosis and the oxidative burst in PMA-stimulated hemocytes. After 504 h, intracellular levels of ROS returned to normal, but phagocytosis of E. coli was still inhibited and the associated oxidative burst significantly reduced. After both durations of exposure, decreases of NRRT indicated that lysosome membrane fragility increased with fomesafen concentration. Potential implications for the health and survival of the snails and consequences on populations are discussed. - Fomesafen inhibited phagocytosis and the associated oxidative burst, and increased lysosome fragility in L. stagnalis hemocytes.

  2. Shell morphology of the freshwater snail Gundlachia ticaga (Gastropoda: Ancylidae) from four sites in Ilha Grande, southeastern Brazil

    Scientific Electronic Library Online (English)

    Luiz Eduardo M., Lacerda; Igor C., Miyahira; Sonia B., Santos.

    2011-06-01

    Full Text Available The freshwater snail Gundlachia ticaga (Marcus & Marcus, 1962) is widely distributed in Brazil, but its morphology has been poorly studied. We compared the shell morphology of samples from four sites (Vila do Abraão, Vila de Provetá, Parnaioca and Praia do Sul) in Ilha Grande (Angra dos Reis, state [...] of Rio de Janeiro) in order to evaluate differences within and among four populations. We used nine morphometric characters representing shell size and shape. To analyze shell morphology we considered aperture shape, sculpture of teleoconch, apex carving and position. The resulting dataset was correlated by Pearson´s linear correlation and shell differences among populations were tested using ANOVA and Discriminant Function Analysis. The results showed that there is significant variation among populations concerning shell shape and morphology. Shells from preserved localities (Praia do Sul and Parnaioca) and shells from highly modified environments (Vila do Abraão and Vila de Provetá) were the most similar to each other. Results from the visual assessment and from the discriminant analysis were almost identical. The shell indices are the most important variables in the differentiation of samples. The observed variation corroborates the hypothesis that G. ticaga displays phenotypic plasticity, which may lead to wrong identifications. Narrower shells with an elongate aperture could be misidentified as Ferrissia Walker, 1903 and, broader shells with a roundish aperture could be wrongly identified as Burnupia Walker, 1912. We confirmed that the absence of radial lines is not a good diagnostic character for G. ticaga. The analysis of the apical micro-sculpture and soft parts is essential for a correct identification.

  3. Thais (Stramonita) rustica (Lamarck, 1822) (Mollusca: Gastropoda: Thaididae), a potential bioindicator of contamination by organotin northeast Brazil

    Scientific Electronic Library Online (English)

    Ítalo Braga de, Castro; Carlos A. O., Meirelles; Helena, Matthews-Cascon; Marcos Antonio, Fernandez.

    2004-06-01

    Full Text Available A utilização de tintas antiincrustrantes contendo o composto biocida tributilestanho (TBT) tem induzido moluscos neogastrópodes ao imposex. O imposex é caracterizado pelo surgimento de caracteres sexuais masculinos, sobretudo, pênis e vaso deferente não funcionais em fêmeas desses moluscos. Foram co [...] letadas amostras de Thais rústica em oito estações ao longo da costa da cidade de Natal no Rio Grande do Norte. Esses animais foram analisados quanto a presença e o grau de imposex que apresentavam. Os níveis mais elevados de imposex foram observados na estação mais próxima ao porto. Abstract in english The use of antifouling paints containing the biocide compound tributyltin (TBT) has been shown as an inductor of imposex in neogastropods mollusks. Imposex is characterized by the development of male features in females, mainly the appearance of a no functional vas deferens and penis. Samples of Tha [...] is rustica were collected in eight sites in the metropolitan area of Natal city, Rio Grande do Norte state, northeast Brazil, and examined for occurrence of imposex, which was found in many females. The higher imposex levels were presented by samples from sites near city harbor.

  4. Phylogeography and Genetic Differentiation among Populations of the Moon Turban Snail Lunella granulata Gmelin, 1791 (Gastropoda: Turbinidae

    Directory of Open Access Journals (Sweden)

    Chuen-Tan Jean

    2013-04-01

    Full Text Available We examined the genetic variation and phylogeographic relationships among 10 populations of Lunella granulata from mainland China, Penghu Archipelago, Taiwan Island, and Japan using mitochondrial COI and 16S markers. A total of 45 haplotypes were obtained in 112 specimens, and relatively high levels of haplotype diversity (h = 0.903 and low levels of nucleotide diversity (? = 0.0046 were detected. Four major phylogenetic lineage clusters were revealed and were concordant with their geographic distribution, agreeing with the haplotype network. These results suggested that geographic barrier isolating effects were occurring among the populations. This hypothesis was also supported by a significant genetic differentiation index (FST = 0.709 and by a spatial analysis of molecular variance (SAMOVA analysis. A mismatch distribution analysis, neutrality tests and Bayesian skyline plots found a single significant population expansion. This expansion occurred on the coast of mainland China before 20–17 ka. Consequently, although the dispersal ability of the planktonic stage and the circulation of ocean currents generally promote genetic exchanges among populations, L. granulata has tended to maintain distinct genetic groups that reflect the respective geographic origins of the constituent lineages. Although the circulation of ocean currents, in principle, may still play a role in determining the genetic composition of populations, long-distance migration between regions is difficult even at the planktonic stage.

  5. New records of Vertigo moulinsiana (Gastropoda: Vertiginidae and notes on its distribution and habitats in the Czech Republic

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    Luboš Beran

    2006-04-01

    Full Text Available Vertigo moulinsiana (Dupuy, 1849 was found in 2003–2005 in Northern Bohemia (Czech Republic at 11 sites. All these sites are situated on floodplains of smaller streams in a sandstone area. The known occurrence of this endangered relict in the Czech Republic is concentrated in three areas – a large area of Bohemian Cretaceous Basin, a floodplain near villages B?ežany and Božice (Dyje River Basin in Southern Moravia and small, isolated, treeless fens in the White Carpathians (Bílé Karpaty Mts.. The principal habitats where V. moulinsiana lives in the Czech Republic are sedge marshes, Typha swamps, reed swamps (with Carex spp., alder carrs (also with Carex spp. and tufa-forming spring fens.

  6. New records of Vertigo moulinsiana (Gastropoda: Vertiginidae) and notes on its distribution and habitats in the Czech Republic

    OpenAIRE

    Luboš Beran

    2006-01-01

    Vertigo moulinsiana (Dupuy, 1849) was found in 2003–2005 in Northern Bohemia (Czech Republic) at 11 sites. All these sites are situated on floodplains of smaller streams in a sandstone area. The known occurrence of this endangered relict in the Czech Republic is concentrated in three areas – a large area of Bohemian Cretaceous Basin, a floodplain near villages B?ežany and Božice (Dyje River Basin) in Southern Moravia and small, isolated, treeless fens in the White Carpathians (Bílé K...

  7. Sôbre a cópula e a constituicäo do aparelho genital de Succinea meridionalis Orbigny, 1846: (Gastropoda, Pulmonata, Succineidae)

    Scientific Electronic Library Online (English)

    Pedro Domingues, Lanzieri.

    Full Text Available Neste trabalho é feita a descrição anatômica e histológica do aparelho genital de Succiena meridionalis Orbigy, 1846, considerando-se também a concha, mandíbula, rádula e câmara paleal. As variações da concha, rádula e "talon", bem como a intensidade de pigmentação de diversas estruturas também são [...] discutidas. Além dêstes aspectos, são relatados alguns dados biológicos da espécie e disposição anatômica do aparelho copulador por ocasião do ato sexual. Como caracteres importantes para diagnose desta espécie, dentro do gênero, consideramos: 1 - Conchas geralmente translúcidas e frágeis, como comprimento, nos adultos, variando de 6,0 a 13,1 mm e número de espiras compreendida entre 2 1/6 e 3 1/6. 2 - Ovotestis constituído por numerosos folículo reunidos num só grupo. 3 - Canal coletor do ovotestis unido à vesícula seminal subterminalmente. 4 - Vagina curta e mais dilatada na porção proximal, podendo formar um ângulo reto ou agudo com o oviduto. 5 - Bainha muscular do pênis envolvendo a porção distal do falus e sendo atravessada subrterminalmente pelo canal deferente. 6 - Porção proximal do falus bem dilatada, tendo dobrada contra si o epifalus. 7 - Presença de uma papila na comunicação do epifalus com a porção proximal do falus e que se projeta para a luz dêste último. 8 - Inserção terminal do músculo retrtor no epifalus.

  8. The South American radiation of Jerrybuccinum (Gastropoda, Buccinidae), with a new deep-water species from Chile

    OpenAIRE

    Fraussen, Koen; Sellanes, Javier; Stahlschmidt, Peter

    2014-01-01

    A new deep water species from off the Chilean coast, Jerrybuccinum kantori sp. n., is described. The animal is equipped with a large statocyst. Kryptos explorator Fraussen & Sellanes, 2008 from off Concepción is found to be congeneric and transferred to the genus Jerrybuccinum. Differences in size and sculpture serve to distinguish the new species from J. explorator. Both Chilean species are associated with methane seep or low oxygen environments. They are compared with J. malvinense Kantor ...

  9. Bioindicator Thais carinifera (mollusca, gastropoda): imposex response and consequences along the Pakistan coast during the period from 1993 to 2012

    Scientific Electronic Library Online (English)

    Nuzhat, Afsar; Ghazala, Siddiqui; Zarrien, Ayub.

    2015-06-01

    Full Text Available Resumo O fenômeno hormonal "imposex" foi investigado e relatado para o gastrópode muricídeo Thais carinifera durante duas décadas, de 1993 a 2012, em três das seis localidades investigadas ao longo da costa de Sindh and Balochistão, Paquistão. Os estágios VDS 1 a 4 foram aparentes na espécie. A inte [...] nsidade do imposex permaneceu comparativamente baixa nas populações dos portos próximos do porto de Mohammad Bin-Qasim, especificamente em Old Korangi Fish Harbour (OKFH) e New Korangi Fish Harbour (NKFH), onde as atividades portuárias são esporádicas quando comparadas às de Manora Channel e à área adjacente do Porto de Karachi, onde a atividade portuária é mais intensa. A espécie alvo mostrou-se um bom bioindicador por ter apresentado decréscimo acentuado ao longo do extenso período de estudo. As investigações mostraram que esse decréscimo é apenas devido ao efetivo banimento globalmente imposto da tributiltina (TBT) como base de tintas anti-incrustantes ocorrido na década passada. Abstract in english Abstract Endocrine mediated "imposex" phenomenon was investigated and recorded in the muricoid gastropod species Thais carinifera during the two decades from 1993 to 2012 at three (3) sites out of six (6) localities investigated along the Sindh and Balochistan coast, Pakistan. The VDS stages 1 to 4 [...] were apparent in Thais carinifera. The intensity of imposex has remained comparatively low in the populations of harbours in close proximity to port Mohammad Bin-Qasim, namely; Old Korangi Fish Harbour (OKFH) and New Korangi Fish Harbour (NKFH) where shipping activities are sporadic as compared to those in Manora Channel and the adjoining Karachi Port area where intensive shipping activity is rather frequent. Target species found to be good bioindicators have shown a marked decrease over the prolonged study period. Investigations show that this decrease is solely due to globally imposed effective bans on tributyltin (TBT) based antifouling paints over the past decade.

  10. Spatial diversity of rocky midlittoral macro-invertebrates associated with the endangered species Patella ferruginea (Mollusca: Gastropoda) of Tunisian coastline

    Science.gov (United States)

    Tlig-Zouari, Sabiha; Rabaoui, Lotfi; Fguiri, Hosni; Diawara, Moctar; Ben Hassine, Oum Kalthoum

    2010-04-01

    The present study focuses on horizontal spatial variability of benthic macrofauna associated with Patella ferruginea. Thirty-six samples collected at 12 transects belonging to 4 midlittoral sites along the rocky Tunisian coastline, were examined. A total of 44 species belonging to 5 taxa were found. Multivariate analysis applied on gathered data did not show a horizontal spatial variability at small scale (between transects), but at large scale, between sites as well as sectors. Thus, three groups of communities were identified (GI: Korbous and El Haouaria; GIIa: Zembra Island and GIIb: Kelibia). The distribution of species abundance within these groups revealed that crustaceans were the most abundant taxon, due to the overwhelming dominance of Chthamalus stellatus. This substratum appeared to create favourable micro-habitats for the installation of molluscs including gastropods. Regarding the low diversity index ( H') and evenness ( J), they seemed to reflect a disturbance and a demographic unbalance within these communities. The heterogeneity of substrate surface, created by C. stellatus specimens appeared to be caused by various complex interactions established between the key components of these communities in particular suspension feeders, predators, herbivorous molluscs and macroalgae. Thus, the dynamic status of each of these communities is the result of these complex interactions.

  11. First record of Thylaeodus (Gastropoda: Vermetidae) from the Equatorial Atlantic Ocean, with the description of a new species

    Scientific Electronic Library Online (English)

    Paula, Spotorno; Luiz Ricardo L., Simone.

    2013-02-01

    Full Text Available The vermetid Thylaeodus equatorialis sp. nov. is endemic to the São Pedro and São Paulo Archipelago, located at the mid equatorial Atlantic Ocean. The species is closely related to Thylaeodus rugulosus (Monterosato, 1878), as indicated by similar shell characters, coloration of the soft parts, and f [...] eeding tube scars. However, T. equatorialis sp. nov. mainly differs from T. rugulosus in the operculum/aperture diameter ratio (~79% versus 100%), by having well developed pedal tentacles and fewer egg capsules in brooding females. In addition, the new species has the following unique characteristics: size almost twice as large (shell, tube aperture, erect feeding tube, protoconch and egg capsules) as the other Atlantic species; unusual method of brooding egg capsules; radula with prominent and more numerous flanking cusps; and small pustules following the suture of the protoconch. A detailed discussion on the taxonomy and biology of vermetid Thylaeodus and allies is also presented.

  12. Observations on Neotricula aperta (Gastropoda: Pomatiopsidae population densities in Thailand and central Laos: implications for the spread of Mekong schistosomiasis

    Directory of Open Access Journals (Sweden)

    Attwood Stephen W

    2012-06-01

    Full Text Available Abstract Background The snail Neotricula aperta transmits Mekong schistosomiasis in southern Laos and Cambodia, with about 1.5 million people at risk of infection. Plans are under consideration for at least 12 hydroelectric power dams on the lower Mekong river and much controversy surrounds predictions of their environmental impacts. Unfortunately, there are almost no ecological data (such as long term population trend studies available for N. aperta which could be used in impact assessment. Predictions currently assume that the impacts will be the same as those observed in Africa (i.e., a worsening of the schistosomiasis problem; however, marked ecological differences between the snails involved suggest that region specific models are required. The present study was performed as an initial step in providing data, which could be useful in the planning of water resource development in the Mekong. Snail population density records were analyzed for populations close to, and far downstream of, the Nam Theun 2 (NT2 project in Laos in order to detect any changes that might be attributable to impoundment. Results The population immediately downstream of NT2 and that sampled 400?km downstream in Thailand both showed a long term trend of slow growth from 1992 to 2005; however, both populations showed a marked decline in density between 2005 and 2011. The decline in Thailand was to a value significantly lower than that predicted by a linear mixed model for the data, whilst the population density close to NT2 fell to undetectable levels in 2011 from densities of over 5000?m-2 in 2005. The NT2 dam began operation in 2010. Conclusions The impact of the NT2 dam on N. aperta population density could be more complex than first thought and may reflect the strict ecological requirements of this snail. There was no indication that responses of N. aperta populations to dam construction are similar to those observed with Bulinus and Schistosoma haematobium in Africa, for example. In view of the present findings, more ecological data (in particular population density monitoring and surveillance for new habitats are urgently required in order to understand properly the likely impacts of water resource development on Mekong schistosomiasis.

  13. Biochemical composition and tissue weight of Chorus giganteus (GASTROPODA : MURICIDAE) exposed to different diets and temperatures during reproductive  conditioning / COMPOSIÇÃO BIOQUÍMICA E PESO DOS TECIDOS DE Chorus giganteus (GASTROPODA: MURICIDAE) EXPOSTO A DIFERENTES DIETAS E TEMPERATURAS DURANTE O ACONDICIONAMENT / COMPOSICIÓN BIOQUÍMICA Y PESO DE LOS TEJIDOS DE Chorus giganteus (GASTROPODA: MURICIDAE) EXPUESTO A DIFERENTES DIETAS Y TEMPERATURAS DURANTE EL ACONDICIONAMIENTO REPRODUCTIVO

    Scientific Electronic Library Online (English)

    Claudio A, Carrasco; Jorge M, Navarro; Germán E, Leiva.

    2006-05-01

    Full Text Available Realizou-se um estudo para determinar os efeitos da temperatura e dieta sobre o peso e composição bioquímica dos tecidos brandos do gastrópode Chorus giganteus durante um período de acondicionamento reprodutivo de 133 dias. Especímenes adultos obtidos desde a zona submareal de Chaihuin (Valdivia, Ch [...] ile), com tamanhos entre 9 e 13cm de longitude total, foram mantidos em estanques de água de mar a 13, 15 e 18ºC e alimentados ad libitum em sistemas separados com o bivalve Mytilus chilensis ou com a almeja Tagelus dombeii. Outros dois grupos de caracóis foram instalados em cultivos suspendidos na bahía de Metri, ao Leste do seno de Reloncaví, utilizando as mesmas dietas, com o fim de ter um grupo comparativo de especímenes expostos à temperatura ambiente (11,0-15,4ºC). Os resultados demonstram que todos os tecidos dos caracóis alimentados com T. dombeii aumentaram seu peso e componentes bioquímicos, enquanto que o grupo de caracóis alimentados com M. chilensis mostrou uma baixa preferência por esta dieta, sem apresentar ganho de tecidos. As temperaturas mais favoráveis para o processo de acondicionamento reprodutivo foram 13 e 15ºC, ao igual que a temperatura ambiental, sem diferenças significativas entre estes diferentes grupos. Abstract in spanish Se realizó un estudio para determinar los efectos de la temperatura y dieta sobre el peso y composición bioquímica de los tejidos blandos del gastrópodo Chorus giganteus durante un periodo de acondicionamiento reproductivo de 133 días. Especímenes adultos obtenidos desde la zona submareal de Chaihui [...] n (Valdivia, Chile), con tamaños entre 9 y 13cm de longitud total, fueron mantenidos en estanques de agua de mar a 13, 15 y 18ºC y alimentados ad libitum en sistemas separados con el bivalvo Mytilus chilensis o con la navajuela Tagelus dombeii. Otros dos grupos de caracoles fueron instalados en cultivos suspendidos en la bahía de Metri, al Este del seno de Reloncaví, utilizando las mismas dietas, con el fin de tener un grupo comparativo de especímenes expuestos a la temperatura ambiente (11,0-15,4ºC). Los resultados demuestran que todos los tejidos de los caracoles alimentados con T. dombeii aumentaron su peso y componentes bioquímicos, mientras que el grupo de caracoles alimentados con M. chilensis mostró una baja preferencia por esta dieta, sin presentar ganancia de tejidos. Las temperaturas más favorables para el proceso de acondicionamiento reproductivo fueron 13 y 15ºC, al igual que la temperatura ambiental, sin diferencias significativas entre estos diferentes grupos. Abstract in english A study was made of the effects of temperature and diet on the dry soft tissue weight and biochemical composition of the gastropod Chorus giganteus (trumulco) over a 133 day period of reproductive conditioning. Adult specimens measuring 9-13cm in total length obtained from the subtidal habitat at Ch [...] aihuin (Valdivia, Chile) were maintained in seawater tanks at 13, 15 and 18ºC, and fed ad libitum in parallel systems with either mussels, Mytilus chilensis, or razor clams, Tagelus dombeii. Two groups of snails were simultaneously installed in suspended culture at Metri Bay on the eastern shore of Reloncavi Sound using the same diets, in order to provide a comparative group of specimens exposed to environmental temperatures (11.0-15.4ºC). The results show that all tissues of the snails fed with T. dombeii increased in dry weight and in biochemical components, while the second group of snails showed low preference for M. chilensis and no tissue gains. The most favourable temperatures for the reproductive conditioning were 13 and 15ºC, as well as the ambient temperature, with no significant differences among these treatments.

  14. ESTUDO DO APROVEITAMENTO DAS VÍSCERAS DOS MOLUSCOS ESCARGOT (Achatina fulica E ARUÁ (Pomacea lineata PARA INCORPORAÇÃO EM RAÇÃO ANIMAL

    Directory of Open Access Journals (Sweden)

    S. E. R. BARBOZA

    2008-09-01

    Full Text Available

    O objetivo deste trabalho foi estudar o aproveitamento das vísceras - subprodutos, dos moluscos escargot e aruá. As vísceras foram processadas na forma de farinha e suas características físico-químicas (composição centesimal, cálcio, fósforo, digestibilidade em pepsina, índice de acidez e microbiológicas (Salmonella sp foram comparadas aos padrões de qualidades exigidas pela Legislação (6.198, de 26/12/74, e o Decreto 76.986, de 06/01/76 do Ministério da Agricultura e Abastecimento para a comercialização de produtos destinados à alimentação animal. Os resultados obtidos permitiram verificar que as farinhas de vísceras de ambas espécies podem ser utilizadas como matérias primas, constituindo ótimas fontes de nutrientes para a incorporação em rações animais.

  15. Larval trematodes (Digenea) of the great pond snail, Lymnaea stagnalis (L.), (Gastropoda, Pulmonata) in Central Europe: a survey of species and key to their identification.

    Czech Academy of Sciences Publication Activity Database

    Faltýnková, Anna; Našincová, Vanda; Kablásková, Lenka

    2007-01-01

    Ro?. 14, ?. 1 (2007), s. 39-51. ISSN 1252-607X R&D Projects: GA AV ?R IAA6022404; GA ?R GP524/07/P086; GA ?R GD524/03/H133; GA MŠk LC522 Institutional research plan: CEZ:AV0Z60220518 Keywords : Trematoda * Mollusca * cercaria * metacercaria * Lymnaea stagnalis Subject RIV: EG - Zoology Impact factor: 0.713, year: 2007

  16. Succinea peruviana (Gastropoda en la dieta de la lagartija de las Lomas Microlophus tigris (Sauria en la Reserva Nacional de Lachay, Lima, Perú

    Directory of Open Access Journals (Sweden)

    José Pérez Z.

    2013-03-01

    Full Text Available El presente trabajo informa de la presencia del caracol Succinea peruviana en la dieta de la lagartija de las Lomas Microlophus tigris, la misma que habita el mesohábitat de Lomas con árboles en la Reserva Nacional de Lachay. Este es el primer informe del consumo de caracoles por lagartijas del Desierto Costero Peruano

  17. Confocal Raman microscopy as a tool to describe different mineral and organic phases at high spatial resolution within marine biogenic carbonates: case study on Nerita undata (Gastropoda, Neritopsina

    Directory of Open Access Journals (Sweden)

    J. Nouet

    2011-06-01

    Full Text Available Marine biogenic carbonates formed by invertebrates (e.g. corals and mollusk shells represent complex composites of one or more mineral phases and organic molecules. This complexity ranges from the macroscopic structures observed with the naked eye down to sub micrometric structures only revealed by micro analytical techniques. Understanding to what extent and how organisms can control the formation of these structures requires that the mineral and organic phases can be identified and their spatial distribution related. Here we demonstrate the capability of confocal Raman microscopy applied to cross sections of a shell of Nerita undata to describe the distribution of calcite and aragonite including their crystallographic orientation with high lateral resolution (?300 nm. Moreover, spatial distribution of functional groups of organic compounds can be simultaneously acquired, allowing to specifically relate them to the observed microstructures. The data presented in this case study highlights the possible new contributions of this method to the description of modalities of Nerita undata shell formation, and what could be expected of its application to other marine biogenic carbonates. Localization of areas of interest would also allow further investigations using more localized methods, such as TEM that would provide complementary information on the relation between organic molecules and crystallographic lattice.

  18. A new land snail from the Quaternary of Mallorca (Balearic Islands, Western Mediterranean: Darderia bellverica n. gen., n. sp. (Gastropoda, Pulmonata, Helicodontidae

    Directory of Open Access Journals (Sweden)

    Altaba, C. R.

    2006-12-01

    Full Text Available A new genus and species of land snail is described from pre-human paleosoils at Bellver hill in the island of Mallorca. It is a medium-sized helicodontid with 6 tight coils, dome-shaped spire, obtuse peripheral keel, eccentric umbilicus, narrow aperture inclined forward, sinuous reflected peristome, a low angular tooth, 5 infrapalatal denticles, teleoconch with many regular riblets and widely scattered hair pits, and protoconch with simple wrinkles and very thin spiral lines. This very rare species had been reported as a member of the Iberian-Maghribian Oestophora. Similar Plio-Pleistocene fossils from the Balearics and Sardinia are placed in the new genus. This may constitute a biogeographic link within the Lindholmiolinae, now surviving at both ends of the Mediterranean basin. It remains unknown when, why or whether it became extinct.

  19. Conservation status and updated census of Patella ferruginea (Gastropoda, Patellidae in Ceuta: distribution patterns and new evidence of the effects of environmental parameters on population structure

    Directory of Open Access Journals (Sweden)

    Rivera–Ingraham, G. A.

    2011-06-01

    Full Text Available The Strait of Gibraltar has important populations of the highly endangered patellid limpet Patella ferruginea. Between 2006 and 2010, an exhaustive census was carried out in Ceuta. The total coastline was divided into 17 sectors. The coast of each sector was examined by using 10 m transects. For the case of those sectors composed of breakwaters, jetties or islets, no transects were used, and instead, the total number of individuals was recorded. Each individual was measured to the nearest millimetre using a calliper. Moreover, the complete rocky shore length where the species could potentially be present was calculated, and an estimation of the total number of individuals that each sector could host was made. Results indicate that Ceuta could be home to around 44,000 individuals. The species found in Point Benzú, its westernmost limit of distribution on the North African coasts. The largest populations were recorded on the South Bay, with higher Mediterranean influence. Our results indicate that substrate roughness (topographic heterogeneity and the area’s accessibility highly influence the abundance and population structure. Those populations located on high topographic heterogeneity substrates show higher recruitment rates and lower percentages of larger individuals, while medium to low rugosity surfaces presented the opposite pattern. Additionally, easily accessible areas (and frequented by humans presented smaller average shell sizes. Implications of the results for conservation purposes are discussed.

  20. Effects of thermal effluents on parasites and commensals of Physa gyrina Say (Mollusca: Gastropoda) and their interactions at Lake Wabamun, Alberta

    Energy Technology Data Exchange (ETDEWEB)

    Sankurathri, C.S. (Dept. of the Environment, Nanaimo, British Columbia); Holmes, J.C.

    1976-10-01

    Effects of thermal effluents on the dynamics of larval helminth parasites and on populations of limnaei haetogaster limnaei limnaei and Chaetogaster limnaei vaghini (Annelida; Oligochaeta) harbored by Physa gyrina (Mollusca: Pulmonata) were studied at Lake Wabamun, Alberta. Thermal effluents provided the necessary conditions to maintain digenean parasite transmission throughout the year between definitive and intermediate hosts, and increased the prevalence of certain parasites, especially the metacercarial stages. At temperatures above 24/sup 0/C prevalences of C. l. limnaei and C. l. vaghini decreased in the lake, and at these temperatures in the laboratory C. l. limnaei abandoned the snails and perished. Under experimental conditions the number of Echinoparyphium recurvatum larvae penetrated Physa gyrina was inversely related to the number of C. l. limnaei present. It was also observed that these oligochaetes actively ingested digenean larvae. Elimination of C. l. limnaei caused by thermal effluents has augmented the metacercarial infections. An ecological model depicting the interactions of Physa gyrina--digeneans--Chaetogaster l. limnaei is presented. This is a complex system in which water temperature acts as a main regulating factor. The three main components of the system interact with each other and are influenced by various external factors, resulting in a dynamic ecological system.

  1. A new species of Tambja (Mollusca, Gastropoda, Nudibranchia) from the Mediterranean Sea: description of the first species of the genus from the Balearic Islands and Malta

    Science.gov (United States)

    Domínguez, M.; Pola, M.; Ramón, M.

    2015-06-01

    A new species of polycerid nudibranchs of the genus Tambja is described from Mallorca Island (Spain) and Malta. So far, only two species of Tambja had been recorded in the Mediterranean Sea with a distribution limited to southern Spain. With Tambja mediterranea sp. nov., the distribution of the genus in the Mediterranean Sea is extended, and the new species represents the first occurrence of Tambja at the Balearic Islands and Malta. Externally, the new species is mainly characterized by having ground orange-red colour, dorsum covered with rounded whitish tubercles, rhinophores red with whitish tips and three gill branches with orange-reddish rachis and whitish branches. In the present paper, external and internal features of T. mediterranea are described and compared with other species of the genus, especially with its most similar species, T. limaciformis. Additionally, phylogenetic analyses (Bayesian and maximum likelihood) based on mitochondrial sequences (COI) show that T. mediterranea sp. nov. is sister to T. divae and that both species cluster together with T. limaciformis and T. amakusana with the maximum support.

  2. High-performance thin-layer chromatographic analysis of lutein and beta-carotene in Cerithidia californica (Gastropoda) infected with two species of larval trematodes.

    Science.gov (United States)

    Marsit, C J; Fried, B; Sherma, J

    2000-06-01

    High-performance thin-layer chromatography (HPTLC) analysis was done on lutein and beta-carotene in the digestive gland-gonad complex (DGG) and whole body of uninfected Cerithidia californica snails and those infected with the larval trematodes Mesostephanus appendiculatis or Euhaplorichis californiensis. HPTLC of the DGG extract on C-18 reversed-phase plates developed in petroleum ether-acetonitrile-methanol (1:2:2) mobile phase showed 2 identifiable pigment zones; the least polar zone had a retention factor (Rf) of 0.07, identical to a beta-carotene standard, and the more polar zone had an Rf of 0.41, identical to a lutein standard. Densitometric scanning of the pigment zones in sample versus standard chromatograms showed that the weight percent of lutein in the uninfected DGGs (3.4x10(-3)%) was significantly greater (P<0.05) than that of DGGs infected with either M. appendiculatis (0.35x10(-3)%) or E. californiensis (0.82x10(-3)%). Changes in beta-carotene in the infected DGGs were insignificant compared to the uninfected controls. However, the beta-carotene content of whole snails was significantly reduced (P<0.05) by infection with either trematode. PMID:10864272

  3. The heart of a dragon: 3D anatomical reconstruction of the ‘scaly-foot gastropod’ (Mollusca: Gastropoda: Neomphalina) reveals its extraordinary circulatory system

    OpenAIRE

    Chen, Chong(Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, PR China); Copley, Jonathan T.; Linse, Katrin; Rogers, Alex D.; Sigwart, Julia D.

    2015-01-01

    Introduction The ‘scaly-foot gastropod’ (Chrysomallon squamiferum Chen et al., 2015) from deep-sea hydrothermal vent ecosystems of the Indian Ocean is an active mobile gastropod occurring in locally high densities, and it is distinctive for the dermal scales covering the exterior surface of its foot. These iron-sulfide coated sclerites, and its nutritional dependence on endosymbiotic bacteria, are both noted as adaptations to the extreme environment in the flow of hydrogen sulfide. We pre...

  4. Age, Growth, Mortality and Population Structure of Strombus canarium (Gastropoda: Strombidae): Variations in Male and Female Sub-Populations

    OpenAIRE

    Z.C. Cob; Arshad, A.; J.S. Bujang; M.A. Ghaffar

    2009-01-01

    The age, growth, mortality and population structure of Strombus canarium Linnaeus, 1758 were examined in the Johor Straits, Malaysia from January to December 2005. A total of 2088 conchs were sampled where females were more abundant than males with monthly sex ratio of 1.72±0.17 (N = 12). The estimated growth parameter showed higher asymptotic length (L?) and growth coefficient (K) in females (L? = 70.20 mm, K = 1.50 year-1) compared with the males (L? = 69.30 mm, K = 1.20 year-1). Thi...

  5. Duration of pairing and use of allosperm in Biomphalaria glabrata (Gastropoda: Planorbidae Duração do acasalamento e uso do aloesperma em Biomphalaria glabrata (Gastropode: Planorbidae

    Directory of Open Access Journals (Sweden)

    Marc Vianey-Liaud

    1989-03-01

    Full Text Available Virgin homozygous black pigmented and albino Biomphalaria glabrata are paired during a period varying from 1 to 20 days. The rate of cross-fertilized parents is statistically similar for the various lengths of pairing. As a whole, nearly 80% of the albino snails produce a pigmented progeny. This production begins as soon as the snails are mated and continues after their separation. To measure the actual use of the allosperm, its use during the postmating period must be added to the length of mating. So, it appears that the real use of the allosperm is statistically constant (mean slightly inferior to 8 weeks and not related to the length of the previous pairing.Espécimes virgens de Biomphalaria glabrata (um melâncio e um albino são acasalados durante um período variável de 1 a 20 dias. A proporção de espécimes parentais albinos fecundados por cruzamento é semelhante estatisticamente para os diversos períodos de acasalamento. Em conjunto, cerca de 80% dos albinos produziram descendência pigmentada. Essa produção começa assim que os moluscos são acasalados e continua depois que são separados. Para medir a utilização real do aloesperma, sua utilização durante o período de pós-acasalamento. Parece, assim, que a utilização real do aloesperma é estatisticamente constante (média ligeiramente inferior a oito semanas e não relacionada a duração do acasalamento anterior.

  6. Nueva especie de Planorbidae (Gastropoda: Basommatophora) en la Patagonia chilena: Biomphalaria cristiani sp. nov. / First record of Planorbidae (Mollusca: Basommatophora) in Chilean Patagonia: Biomphalaria cristiani sp. nov.

    Scientific Electronic Library Online (English)

    Carmen, Fuentealba; Ricardo, Figueroa.

    2012-11-01

    Full Text Available En Chile la familia Planorbidae está representada por el género Biomphalaria Preston, 1910, compuesta por siete especies distribuidas desde Isluga hasta el río Puelo. De estas especies, solo B.peregrina, ampliamente distribuida en el neotrópico, y Biomphalaria aymara de Isluga, han sido reconocidas [...] sobre la base de la morfología del sistema reproductor y la rádula, caracteres que fueron utilizados en el presente estudio para diferenciar a Biomphalaria cristiani como nueva especie del grupo y primer registro de la familia en la Patagonia chilena, ampliando su actual rango de distribución. Los caracteres que permiten la diagnosis de B. cristiani son el saco vaginal vestigial truncado, ausencia del desarrollo de los músculos suspensores del pene, vaina del pene corta en relación al prepucio, oviducto largo en relación al espermioducto y vaso deferente más delgado y largo que la vaina del pene, de tamano similar al prepucio. La localidad tipo de Biomphalaria cristiani sp. nov. es Laguna Cisnes (47°7'10.02"S, 72°27'40.65"W), región de Aysén. Abstract in english The family Planorbidae in Chile is represented by the genus Biomphalaria Preston, 1910, consisting of seven species distributed from Isluga to Puelo River. Of these species, only Biomphalaria peregrina widely distributed in the neotropical and Biomphalaria aymara from Isluga are recognized based on [...] the morphology of the reproductive system and radula, characters that were used in the following study to differentiate Biomphalaria cristiani as a new species of this group and first record of the family in Chilean Patagonia, extending its current distribution range. The characters for the diagnosis of B. cristiani are: truncated vestigial vaginal pouch, lack of development of the penis retractor muscles, penis sheath shorter than the prepuce, oviduct longer than the spermiduct and vas deferens thinner and longer than the penis sheath, similar size to the prepuce. The type locality of B. cristiani nov. sp. is Laguna Cisnes (47°7'10.02"S; 72°27'40.65"W), Aysén region.

  7. Preliminary investigations on accompanied invertebrate fauna of farms of Helix pomatia Linnaeus and Helix aspersa O. F. Müller (Helicidae, Gastropoda in Serbia and Montenegro

    Directory of Open Access Journals (Sweden)

    ?ur?i? Sre?ko B.

    2004-01-01

    Full Text Available Altogether 18 species of invertebrates were evidented during investigations on snail farms of Helix pomatia Linnaeus and Helix aspersa O. F. Müller in Serbia and Montenegro. Of these, 9 species from 8 genera were registered from Serbia, and 9 species from 9 genera were collected from Montenegro. Invertebrate material mostly pertained to insects (orders Coleoptera and Heteroptera and crustaceans (order Isopoda. Data about exact ecological status of all species of collected invertebrates were also presented. Also we notify clear distinctions between all analyzed species in the type of feeding (the cases of helicophagy, zoophagy, phytophagy, and mixophagy.

  8. Preliminary investigations on accompanied invertebrate fauna of farms of Helix pomatia Linnaeus and Helix aspersa O. F. Müller (Helicidae, Gastropoda) in Serbia and Montenegro

    OpenAIRE

    ?ur?i? Sre?ko B.; Topalovi? D.; Jakovljevi? Jelena; Brajkovi? Miloje M.; Nikoli? Z.

    2004-01-01

    Altogether 18 species of invertebrates were evidented during investigations on snail farms of Helix pomatia Linnaeus and Helix aspersa O. F. Müller in Serbia and Montenegro. Of these, 9 species from 8 genera were registered from Serbia, and 9 species from 9 genera were collected from Montenegro. Invertebrate material mostly pertained to insects (orders Coleoptera and Heteroptera) and crustaceans (order Isopoda). Data about exact ecological status of all species of collected invertebrates wer...

  9. Glowing Seashells: Diversity of Fossilized Coloration Patterns on Coral Reef-Associated Cone Snail (Gastropoda: Conidae) Shells from the Neogene of the Dominican Republic

    Science.gov (United States)

    Hendricks, Jonathan R.

    2015-01-01

    The biology of modern Conidae (cone snails)—which includes the hyperdiverse genus Conus—has been intensively studied, but the fossil record of the clade remains poorly understood, particularly within an evolutionary framework. Here, ultraviolet light is used to reveal and characterize the original shell coloration patterns of 28 species of cone snails from three Neogene coral reef-associated deposits from the Cibao Valley, northern Dominican Republic. These fossils come from the upper Miocene Cercado Fm. and lower Pliocene Gurabo Fm., and range in age from about 6.6-4.8 Ma. Comparison of the revealed coloration patterns with those of extant species allow the taxa to be assigned to three genera of cone snails (Profundiconus, Conasprella, and Conus) and at least nine subgenera. Thirteen members of these phylogenetically diverse reef faunas are described as new species. These include: Profundiconus? hennigi, Conasprella (Ximeniconus) ageri, Conus anningae, Conus lyelli, Conus (Atlanticonus?) franklinae, Conus (Stephanoconus) gouldi, Conus (Stephanoconus) bellacoensis, Conus (Ductoconus) cashi, Conus (Dauciconus) garrisoni, Conus (Dauciconus?) zambaensis, Conus (Spuriconus?) kaesleri, Conus (Spuriconus?) lombardii, and Conus (Lautoconus?) carlottae. Each of the three reef deposits contain a minimum of 14–16 cone snail species, levels of diversity that are similar to modern Indo-Pacific reef systems. Finally, most of the 28 species can be assigned to modern clades and thus have important implications for understanding the biogeographic and temporal histories of these clades in tropical America. PMID:25830769

  10. Accumulation of free and covalently bound microcystins in tissues of Lymnaea stagnalis (Gastropoda) following toxic cyanobacteria or dissolved microcystin-LR exposure

    International Nuclear Information System (INIS)

    Accumulation of free microcystins (MCs) in freshwater gastropods has been demonstrated but accumulation of MCs covalently bound to tissues has never been considered so far. Here, we follow the accumulation of total (free and bound) MCs in Lymnaea stagnalis exposed to i) dissolved MC-LR (33 and 100 ?g L-1) and ii) Planktothrix agardhii suspensions producing 5 and 33 ?g MC-LR equivalents L-1 over a 5-week period, and after a 3-week depuration period. Snails exposed to dissolved MC-LR accumulated up to 0.26 ?g total MCs g-1 dry weight (DW), with no detection of bound MCs. Snails exposed to MCs producing P. agardhii accumulated up to 69.9 ?g total MCs g-1 DW, of which from 17.7 to 66.7% were bound. After depuration, up to 15.3 ?g g-1 DW of bound MCs were detected in snails previously exposed to toxic cyanobacteria, representing a potential source of MCs transfer through the food web. - The study concerns accumulation and elimination of both free and bound microcystins (MCs) in tissues of a gastropod exposed to MCs producing cyanobacteria or dissolved MC-LR.

  11. A new record of Morula anaxares with a description of the radula of three other species from Goa, Central West Coast of India (Gastropoda: Muricidae)

    Digital Repository Service at National Institute of Oceanography (India)

    Kumbhar, J.V.; Rivonker, C.U.

    2012-01-01

    extraction, live specimens were initially anaesthetized using 7.5 % Magnesium chloride to relax and loosen the body muscles attached to the shell and facilitate easy removal of the organism. Subsequently, an incision was made on the dorsal surface... of the head to expose the radular sac located within the mantle cavity. The radular sac was transferred to 19 % KOH solution for digestion of radular tissue. Subsequently, the radula was washed with distilled water and dehydrated using alcohol (Ramesh...

  12. Threatened freshwater and terrestrial molluscs (Mollusca, Gastropoda et Bivalvia of Santa Catarina State, Southern Brazil: check list and evaluation of regional threats

    Directory of Open Access Journals (Sweden)

    2011-06-01

    Full Text Available A total of nineteen continental native mollusc species are confirmed for the Santa Catarina State (SC(organized in ten Genera and seven Families, one aquatic Prosobranchia/Caenogastropoda (Ampullariidae,six Pulmonata terrestrial gastropods (one Ellobiidae, three Megalobulimidae and two micro-snails –Charopidae and Streptaxidae and twelve freshwater mussels (eight Mycetopodidae and four Hyriidae. Thesespecies are designated by the International Union for Conservation of the Nature – IUCN as follows: seven as"Vulnerable", six "In Danger" and six “Without Category Established”. The general regional threats that thesespecies are subjected to are briefly analyzed.

  13. Second record and new locality of the Bulgarian endemic species Insignia macrostoma Angelov, 1972 (Gastropoda: Hydrobiidae) – more than 40 years after its description

    OpenAIRE

    Dilian Georgiev

    2013-01-01

    One shell of Insignia macrostoma Angelov, 1972 without an operculum was found on 10 Dec 2011 in cave river deposits of the Toplya cave, Bulgaria, Stara Planina Mts., near the village of Golyama Zhelyazna. It is the second finding of this species after more than 40 years and a new locality.

  14. Metamorphosis Induction of the Dog Conch Strombus canarium (Gastropoda: Strombidae) Using Cues Associated with Conch Nursery Habitat

    OpenAIRE

    Cob, Z. C.; Arshad, A.; Bujang, J. S.; Muda, W. L. W.; Ghaffar, M. A.

    2010-01-01

    Strombus canarium is a commercially important gastropod that has great potential for advancement into aquaculture. In this study, the metamorphosis response of Strombus canarium larvae to various metamorphosis cues associated with conch nursery habitat and to KCl and GABA, were tested. Bioassays were run as static, no choice experiment and adopting a continuous exposure approach. Strombus canarium larvae showed strong metamorphosis responses when sediment (i.e., conch nursery habitat sediment...

  15. Nueva especie de Planorbidae (Gastropoda: Basommatophora en la Patagonia chilena: Biomphalaria cristiani sp. nov. First record of Planorbidae (Mollusca: Basommatophora in Chilean Patagonia: Biomphalaria cristiani sp. nov.

    Directory of Open Access Journals (Sweden)

    Carmen Fuentealba

    2012-11-01

    Full Text Available En Chile la familia Planorbidae está representada por el género Biomphalaria Preston, 1910, compuesta por siete especies distribuidas desde Isluga hasta el río Puelo. De estas especies, solo B.peregrina, ampliamente distribuida en el neotrópico, y Biomphalaria aymara de Isluga, han sido reconocidas sobre la base de la morfología del sistema reproductor y la rádula, caracteres que fueron utilizados en el presente estudio para diferenciar a Biomphalaria cristiani como nueva especie del grupo y primer registro de la familia en la Patagonia chilena, ampliando su actual rango de distribución. Los caracteres que permiten la diagnosis de B. cristiani son el saco vaginal vestigial truncado, ausencia del desarrollo de los músculos suspensores del pene, vaina del pene corta en relación al prepucio, oviducto largo en relación al espermioducto y vaso deferente más delgado y largo que la vaina del pene, de tamano similar al prepucio. La localidad tipo de Biomphalaria cristiani sp. nov. es Laguna Cisnes (47°7'10.02"S, 72°27'40.65"W, región de Aysén.The family Planorbidae in Chile is represented by the genus Biomphalaria Preston, 1910, consisting of seven species distributed from Isluga to Puelo River. Of these species, only Biomphalaria peregrina widely distributed in the neotropical and Biomphalaria aymara from Isluga are recognized based on the morphology of the reproductive system and radula, characters that were used in the following study to differentiate Biomphalaria cristiani as a new species of this group and first record of the family in Chilean Patagonia, extending its current distribution range. The characters for the diagnosis of B. cristiani are: truncated vestigial vaginal pouch, lack of development of the penis retractor muscles, penis sheath shorter than the prepuce, oviduct longer than the spermiduct and vas deferens thinner and longer than the penis sheath, similar size to the prepuce. The type locality of B. cristiani nov. sp. is Laguna Cisnes (47°7'10.02"S; 72°27'40.65"W, Aysén region.

  16. Bulinus globosus (Planorbidae; Gastropoda) populations in the Lake Victoria basin and coastal Kenya show extreme nuclear genetic differentiation

    DEFF Research Database (Denmark)

    Nyakaana, Silvester; Stothard, J. Russell

    2013-01-01

    Bulinus globosus, a key intermediate host for Schistosoma haematobium that causes urinary schistosomiasis, is a hermaphroditic freshwater Planorbid snail species that inhabits patchy and transient water bodies prone to large seasonal variations in water availability. Although capable of self-fertilizing, this species has been reported to be preferentially out crossing. In this study, we characterized the population genetic structure of 19 B. globosus populations sampled across the Lake Victoria basin and coastal Kenya using four polymorphic microsatellite loci. Population genetic structure was characterized and quantified using FST statistics and Bayesian clustering algorithms. The four loci used in this study contained sufficient statistical power to detect low levels of population genetic differentiation and were highly polymorphic with the number of alleles per locus across populations ranging from 16 to 22. Average observed and expected heterozygosities across loci in each population ranged from 0.13 to 0.69 and from 0.39 to 0.79, respectively. Twenty-five of the seventy-six possible population-locus comparisons significantly deviated from Hardy–Weinberg equilibrium proportions after Bonferroni corrections, mostly due to the deficiency of heterozygotes. Significant genetic differentiation was observed between populations and Bayesian inferences identified 15 genetic clusters. The excess homozygosity, significant inbreeding and population genetic differentiation observed in B. globosus populations are likely to be due to the habitat patchiness, mating system and the proneness to cyclic extinction and recolonization in transient habitats

  17. Diagenetic changes in Concholepas concholepas shells (Gastropoda, Muricidae in the hyper-arid conditions of Northern Chile – implications for palaeoenvironmental reconstructions

    Directory of Open Access Journals (Sweden)

    L. Ortlieb

    2008-02-01

    Full Text Available Variations on chemical composition in fossil biogenic carbonates, and in particular of mollusk shells, have been used in a range of palaeoenvironmental reconstructions. Therefore, it is of primary importance to detect and understand the diagenetic processes that may modify the original chemical signature. This microstructural and biogeochemical study focuses on modern and fossil (Pleistocene and Holocene shells of a littoral gastropod of Northern Chile, and on the characterization of mineral component transformations at the nanometric scale and concomitant intracrystalline organic compound modifications. The inner aragonite layer of the shell exhibits more complex deteriorations than the calcite layer. This preliminary study confirms that physical and chemical alterations of various components of mollusk shell biocrystals are complex and might manifest in different ways even within a single individual. The single criterion of determining the mineralogical composition to attest shell sample conservation state should not be considered as sufficient.

  18. Diagenetic changes in Concholepas concholepas shells (Gastropoda, Muricidae in the hyper-arid conditions of Northern Chile – implications for palaeoenvironmental reconstructions

    Directory of Open Access Journals (Sweden)

    L. Ortlieb

    2009-02-01

    Full Text Available Variations in the chemical composition of fossil biogenic carbonates, and in particular of mollusc shells, have been used in a range of palaeoenvironmental reconstructions. It is of primary importance, therefore, to detect and understand the diagenetic processes that may modify the original chemical signature. This microstructural and biogeochemical study focuses on modern and fossil (Holocene and Pleistocene shells of a littoral gastropod of Northern Chile, and on the characterization of mineral component transformations at the nanometric scale and concomitant intracrystalline organic compound modifications. The inner aragonite layer of the shell exhibits more complex deteriorations than the calcite layer. This preliminary study confirms that physical and chemical alterations of various components of mollusc shell biocrystals are complex and might manifest in different ways even within a single individual. The single criterion of determining the mineralogical composition to verify the conservation state of shell samples is insufficient.

  19. Glowing seashells: diversity of fossilized coloration patterns on coral reef-associated cone snail (Gastropoda: Conidae) shells from the Neogene of the Dominican Republic.

    Science.gov (United States)

    Hendricks, Jonathan R

    2015-01-01

    The biology of modern Conidae (cone snails)--which includes the hyperdiverse genus Conus--has been intensively studied, but the fossil record of the clade remains poorly understood, particularly within an evolutionary framework. Here, ultraviolet light is used to reveal and characterize the original shell coloration patterns of 28 species of cone snails from three Neogene coral reef-associated deposits from the Cibao Valley, northern Dominican Republic. These fossils come from the upper Miocene Cercado Fm. and lower Pliocene Gurabo Fm., and range in age from about 6.6-4.8 Ma. Comparison of the revealed coloration patterns with those of extant species allow the taxa to be assigned to three genera of cone snails (Profundiconus, Conasprella, and Conus) and at least nine subgenera. Thirteen members of these phylogenetically diverse reef faunas are described as new species. These include: Profundiconus? hennigi, Conasprella (Ximeniconus) ageri, Conus anningae, Conus lyelli, Conus (Atlanticonus?) franklinae, Conus (Stephanoconus) gouldi, Conus (Stephanoconus) bellacoensis, Conus (Ductoconus) cashi, Conus (Dauciconus) garrisoni, Conus (Dauciconus?) zambaensis, Conus (Spuriconus?) kaesleri, Conus (Spuriconus?) lombardii, and Conus (Lautoconus?) carlottae. Each of the three reef deposits contain a minimum of 14-16 cone snail species, levels of diversity that are similar to modern Indo-Pacific reef systems. Finally, most of the 28 species can be assigned to modern clades and thus have important implications for understanding the biogeographic and temporal histories of these clades in tropical America. PMID:25830769

  20. Effects of endocrine disruptors on prosobranch snails (Mollusca: Gastropoda) in the laboratory. Part I: Bisphenol A and octylphenol as xeno-estrogens.

    Science.gov (United States)

    Oehlmann, J; Schulte-Oehlmann, U; Tillmann, M; Markert, B

    2000-12-01

    The effects of suspected endocrine disrupting chemicals on freshwater and marine prosobranch species were analysed in laboratory experiments. In this first publication, the responses of the freshwater snail Marisa cornuarietis and of the marine prosobranch Nucella lapillus to the xeno-estrogenic model compounds bisphenol A (BPA) and octylphenol (OP) are presented at nominal concentration ranges between 1 and 100 micrograms/L. Marisa was exposed during 5 months using adult specimens and in a complete life-cycle test for 12 months. In both experiments, the xeno-estrogens induced a complex syndrome of alterations in female Marisa referred to as "superfemales" at the lowest concentrations. Affected specimens were characterised by the formation of additional female organs, an enlargement of the accessory pallial sex glands, gross malformations of the pallial oviduct section resulting in an increased female mortality, and a massive stimulation of oocyte and spawning mass production. The effects of BPA and OP were comparable at the same nominal concentrations. An exposure to OP resulted in inverted U-type concentration response relationships for egg and spawning mass production. Adult Nucella from the field were tested for three months in the laboratory. As in Marisa, superfemales with enlarged accessory pallial sex glands and an enhancement of oocyte production were observed. No oviduct malformations were found probably due to species differences in the gross anatomical structure of the pallial oviduct. A lower percentage of exposed specimens had ripe sperm stored in their vesicula seminalis and additionally male Nucella exhibited a reduced length of penis and prostate gland when compared to the control. Because statistically significant effects were observed at the lowest nominal test concentrations (1 microgram BPA or OP/L), it can be assumed that even lower concentrations may have a negative impact on the snails. The results show that prosobranchs are sensitive to endocrine disruption at environmentally relevant concentrations and that especially M. cornuarietis is a promising candidate for a future organismic invertebrate model to identify endocrine-mimetic test compounds. PMID:11214443

  1. Recovery from imposex by a population of the dogwhelk, Nucella lapillus (Gastropoda: Caenogastropoda), on the southeastern coast of England since May 2004: a 52-month study.

    Science.gov (United States)

    Morton, Brian

    2009-10-01

    Over a 52-month period beginning in May 2004 and concluding in August 2008, and coinciding with the period over which TBT was banned as a ship anti-foulant globally, a population of the dogwhelk, Nucella lapillus, was studied for changes in population size and structure, and reproduction. During the study period, the size of the population of N. lapillus on the Mewsbrook Groyne at Littlehampton on the southeastern coast of England grew from approximately 25 individuals to >500, i.e., a 20-fold increase. Similarly, population structure normalised to reveal a maximum age of up to approximately 3 years. The numbers of egg capsules produced by the N. lapillus population also grew over the study, again by a factor of 20, and the length of the breeding season increased from 7 months in 2004-2005 and 2005-2006 to 11 months in 2006-2007 and 2007-2008. Such changes were reflected in the incidence of imposex from Vas Deferens Index Stages 3 and 4 in 2003 to zero commencing in 2008 and continuing into 2009. Due to a lack of confirmatory chemical data, the changes in population size, structure and reproduction herein reported upon for N. lapillus cannot be correlated positively with changes in ambient TBT levels, but they can and are correlated with freedom from imposex. This is the first time such a dramatic recovery from imposex, following the banning of TBT, has been documented. PMID:19501847

  2. Long-term changes in Prosobranchia (Gastropoda) abundances on the German North Sea coast: the role of the anti-fouling biocide tributyltin

    Science.gov (United States)

    Nehring, S.

    2000-05-01

    Tributyltin (TBT) has been used as a biocide in marine anti-fouling paints since the early 1970s. Due to its strong ecotoxicity and the relatively high levels in the water column as well as in port sediments on the German North Sea coast, it probably has negative ecological effects on organisms other than those targeted. An analysis of the long-term development of prosobranch stocks in the inner German Bight reveals a decrease in abundance of many species. For most species the decline cannot be attributed to TBT, but in four prosobranch species ( Buccinum undatum, Hydrobia ulvae, Littorina littorea and Nucella lapillus) significant ecological effects by TBT pollution are very probable. Although research for alternative non-TBT anti-fouling paints (e.g. biocide-free types on the basis of silicone) has been intensified, the potential threats to ecosystems and the ecotoxicological profiles of these alternatives have to be carefully evaluated.

  3. Bait formulations of molluscicides and their effects on biochemical changes in the ovotestis of snail Lymnaea acuminata (Mollusca; Gastropoda:Lymnaeidae).

    Science.gov (United States)

    Kumar, Pradeep; Singh, Vinay Kumar; Singh, D K

    2011-01-01

    The effect of sub-lethal feeding of bait formulations containing molluscicidal component of Ferula asafoetida (ferulic acid, umbelliferone), Syzygium aromaticum (eugenol) and Carum carvi (limonene) on biochemical changes in the ovotestis of snail Lymnaea acuminata were studied. Bait formulations feeding to L. acuminata were studied in clear glass aquaria having diameter of 30 cm. Baits were prepared from different binary combinations of attractant amino acid (valine, aspartic acid, lysine and alanine 10 mM) in 100 mL of 2% agar solution + sub-lethal (20% and 60% of 24h LC50) doses of different molluscicides (ferulic acid, umbelliferone, eugenol and limonene). These baits caused maximum significant reduction in free amino acid, protein, DNA, RNA levels i.e. 41.37, 23.56, 48.36 and 14.29% of control in the ovotestis of the snail, respectively. Discontinuation of feeding after treatment of 60% of 96h LC50 of molluscicide containing bait for next 72h caused a significant recovery in free amino acid, protein, DNA and RNA levels in the ovotestis of L. acuminata. PMID:22012453

  4. Assessing the effects of fluoxetine on Physa acuta (Gastropoda, Pulmonata) and Chironomus riparius (Insecta, Diptera) using a two-species water-sediment test

    International Nuclear Information System (INIS)

    Fluoxetine has been tested in a two-species water-sediment system, which allowed a two-generation study with Chironomus riparius and a partial life-cycle with the freshwater snail Physa acuta to be performed at the same time. The design considered the continuous application of fluoxetine to overlaying water for nominal concentrations of 31.25, 62.5, 125 and 250 ?g/L. A fifth treatment (87.5 ?g/L) level consisted of pulse applications once a week. Measures of water and sediment concentrations were determined once a week and at the end of experiment (day 44), respectively. The fate study demonstrated that water dissipation can be explained by partitioning of fluoxetine to sediment. At the end of experiment, the percentage of detected fluoxetine was up to 10-fold higher in sediment than in overlaying water. The employed two-species test allowed distinguishing, in the same exposure conditions, effects due to waterborne exposure together ingestion at the sediment surface (freshwater grazing snail P. acuta) and exposure by burrowing activities (sediment-dwelling insect larvae C. riparius). The effect assessment showed a stimulation of P. acuta reproduction at lower concentrations (31.25 and 62.5 ?g/L), while the opposite effect was observed at the highest treatment (250 ?g/L). Additional studies should be conducted to establish if the statistically significant differences observed in F0 sex ratio at the 62.5 ?g/L and F1 adult emergence at 31.25 ?g/L of C. riparius havnce at 31.25 ?g/L of C. riparius have a toxicological significance. This study showed that fluoxetine can affect reproduction of freshwater molluscs. The results of the present study may contribute to knowledge on ecotoxicology of pharmaceuticals, about which little data is available. The possible consequences and implications for targeting the environmental risk assessment of fluoxetine are discussed

  5. Veronicellidae (Mollusca, Gastropoda) neotropicais: IV. Redescrição dos tipos de Vaginula andreana, Vaginula reinhardti e Vaginula trilineata, no Zoologisk Museum de Copenhague, Dinamarca

    Scientific Electronic Library Online (English)

    José Willibaldo, Thomé.

    1988-07-01

    Full Text Available Com base no exame dos tipos, são redescritas as espécies Vaginula andreana Semper, 1885, Vaginula reinhardti Semper, 1885 e Vaginula trilineata Semper, 1885. As espécies provêm, respectivamente, de Maurício (Ilhas Mascarenhas; leg. Andrea), Macau, China (leg. Reinhardt), e provavelmente Maurício (Il [...] has Mascarenhas; leg. Andrea, encontrado num pote de plantas no Jardim Botânico de Copenhague). Discute-se a sinonímia das espécies. Abstract in english Upon the examination of the types, the species Vaginula andreana Semper, 1885, Vaginula reinhardti Semper, 1885, and Vaginula trilineata Semper, 1885, are redescribed. They proceed from, respectively: Mauritius (Mascarene ls.; leg. Andrea); Macao, China (leg. Reinhardt): probably Mauritius (Mascaren [...] e ls.; leg. Andrea; found in a pot of plants in the Botanical Garden of Copenhagen). The synonymy of the species is discussed.

  6. Comparative population biology of digenes and their 1st intermediate host mollusc : the case of three Helicometra (Trematoda, Opecoelidae) endoparasites of marine prosobranchs (Gastropoda)

    OpenAIRE

    Reversat, Je?ro?me; Silan, Patrick

    1991-01-01

    In the Etang de Thau (Herault - France), Helicometra gobii, H. fasciata and H. pulchella parasitize the Calliostoma striatum, Gibbula adansoni and Tricolia tenuis gastropods respectively. A comparative analysis of these host populations and their trematodes reveals a relation between the spatial and temporal structures of these populations, the parasite specificity and the specific richness of parasite settlements of these molluscs. Thus, although it has by far the rarest gastropod and has th...

  7. The terrestrial Gastropoda Megalobulimus abbreviatus as a useful model for nociceptive experiments: effects of morphine and naloxone on thermal avoidance behavior

    Scientific Electronic Library Online (English)

    M., Achaval; M.A.P., Penha; A., Swarowsky; P., Rigon; L.L., Xavier; G.G., Viola; D.M., Zancan.

    2005-01-01

    Full Text Available We describe the behavior of the snail Megalobulimus abbreviatus upon receiving thermal stimuli and the effects of pretreatment with morphine and naloxone on behavior after a thermal stimulus, in order to establish a useful model for nociceptive experiments. Snails submitted to non-functional (22ºC) [...] and non-thermal hot-plate stress (30ºC) only displayed exploratory behavior. However, the animals submitted to a thermal stimulus (50ºC) displayed biphasic avoidance behavior. Latency was measured from the time the animal was placed on the hot plate to the time when the animal lifted the head-foot complex 1 cm from the substrate, indicating aversive thermal behavior. Other animals were pretreated with morphine (5, 10, 20 mg/kg) or naloxone (2.5, 5.0, 7.5 mg/kg) 15 min prior to receiving a thermal stimulus (50ºC; N = 9 in each group). The results (means ± SD) showed an extremely significant difference in response latency between the group treated with 20 mg/kg morphine (63.18 ± 14.47 s) and the other experimental groups (P

  8. DNA sequence characterisation and phylogeography of Lymnaea cousini and related species, vectors of fascioliasis in northern Andean countries, with description of L. meridensis n. sp. (Gastropoda: Lymnaeidae

    Directory of Open Access Journals (Sweden)

    Bargues M Dolores

    2011-07-01

    Full Text Available Abstract Background Livestock fascioliasis is a problem throughout Ecuador, Colombia and Venezuela, mainly in Andean areas where the disease also appears to affect humans. Transmission patterns and epidemiological scenarios of liver fluke infection have shown to differ according to the lymnaeid vector snail species involved. These Andean countries present the vectors Lymnaea cousini, L. bogotensis and L. ubaquensis, unknown in the rest of Latin America. An exhaustive combined haplotype study of these species is performed by means of DNA sequencing of the nuclear ribosomal 18S RNA gene, ITS-2 and ITS-1, and mitochondrial DNA cox1 gene. Results The conserved 5.8S rDNA sequence corroborated that no pseudogenes are involved in the numerous non-microsatellite/minisatellite-related indels appearing between the ITS-2 and ITS-1 sequences when comparing different L. cousini - L. bogotensis populations. Sequence analyses and phylogenetic reconstruction methods including other lymnaeid vector species show that (i L. bogotensis is a synonym of L. cousini, (ii L. ubaquensis is a synonym of Pseudosuccinea columella, and (iii populations of L. cousini hitherto known from Venezuelan highlands indeed belong to a new species for which the name L. meridensis n. sp. is proposed. This new species is described and a complete phenotypic differentiation provided. Conclusions ITS-2, ITS-1 and cox1 prove to be good markers for specimen classification and haplotype characterisation of these morphologically similar lymnaeids in endemic areas. Analysis of the 18S gene and phylogenetic reconstructions indicate that L. cousini and L. meridensis n. sp. cluster in an evolutionary line different from the one of P. columella, despite their external resemblance. This suggests an evolutionary phenotypic convergence related to similar environments and which has given rise to frequent specimen misclassification. Body size and phylogenetic relationships of L. meridensis n. sp. with well-known vectors as Lymnaea cousini and P. columella, as well as with Galba/Fossaria species, suggest that the new species may participate in disease transmission to both animals and humans in altitude areas during the yearly window in which temperatures are higher than the F. hepatica minimum development threshold. The involvement of L. cousini and P. columella in the transmission and geographical/altitudinal distribution of fascioliasis in these Andean countries is analysed.

  9. Venomous mollusks: the risks of human accidents by conus snails (gastropoda: conidae) in Brazil / Moluscos peçonhentos: riscos de acidentes em humanos pelo molusco Conus (Gastrópode: cunidae) in Brazil

    Scientific Electronic Library Online (English)

    Vidal, Haddad Junior; João Batista de, Paula Neto; Válter José, Cobo.

    2006-10-01

    Full Text Available Os moluscos do gênero Conus apresentam um aparato venenoso composto de uma rádula quitinosa ligada a glândulas de peçonha, causando envenenamentos humanos graves e mesmo óbitos pela ação neurotóxica indutora do bloqueio de vários receptores e paralisia muscular. Não há casos descritos de envenenamen [...] to no país, mas determinadas populações correm risco de acidentes. Abstract in english Mollusks of the genus Conus present a venomous apparatus composed of radulae, a chitin structure linked to glands, which injects potent neurotoxic peptides, causing serious human envenomation and even death, associated with the blockage of certain receptors and muscular paralysis. No reported enveno [...] mation has occurred in Brazil, but certain populations are at risk of accidents.

  10. Venomous mollusks: the risks of human accidents by conus snails (gastropoda: conidae in Brazil Moluscos peçonhentos: riscos de acidentes em humanos pelo molusco Conus (Gastrópode: cunidae in Brazil

    Directory of Open Access Journals (Sweden)

    Vidal Haddad Junior

    2006-10-01

    Full Text Available Mollusks of the genus Conus present a venomous apparatus composed of radulae, a chitin structure linked to glands, which injects potent neurotoxic peptides, causing serious human envenomation and even death, associated with the blockage of certain receptors and muscular paralysis. No reported envenomation has occurred in Brazil, but certain populations are at risk of accidents.Os moluscos do gênero Conus apresentam um aparato venenoso composto de uma rádula quitinosa ligada a glândulas de peçonha, causando envenenamentos humanos graves e mesmo óbitos pela ação neurotóxica indutora do bloqueio de vários receptores e paralisia muscular. Não há casos descritos de envenenamento no país, mas determinadas populações correm risco de acidentes.

  11. Evaluation of the cholinomimetic actions of trimethylsulfonium, a compound present in the midgut gland of the sea hare Aplysia brasiliana (Gastropoda, Opisthobranchia

    Directory of Open Access Journals (Sweden)

    C.M. Kerchove

    2002-04-01

    Full Text Available Trimethylsulfonium, a compound present in the midgut gland of the sea hare Aplysia brasiliana, negatively modulates vagal response, indicating a probable ability to inhibit cholinergic responses. In the present study, the pharmacological profile of trimethylsulfonium was characterized on muscarinic and nicotinic acetylcholine receptors. In rat jejunum the contractile response induced by trimethylsulfonium (pD2 = 2.46 ± 0.12 and maximal response = 2.14 ± 0.32 g was not antagonized competitively by atropine. The maximal response (Emax to trimethylsulfonium was diminished in the presence of increasing doses of atropine (P<0.05, suggesting that trimethylsulfonium-induced contraction was not related to muscarinic stimulation, but might be caused by acetylcholine release due to presynaptic stimulation. Trimethylsulfonium displaced [³H]-quinuclidinyl benzilate from rat cortex membranes with a low affinity (Ki = 0.5 mM. Furthermore, it caused contraction of frog rectus abdominis muscles (pD2 = 2.70 ± 0.06 and Emax = 4.16 ± 0.9 g, which was competitively antagonized by d-tubocurarine (1, 3 or 10 µM with a pA2 of 5.79, suggesting a positive interaction with nicotinic receptors. In fact, trimethylsulfonium displaced [³H]-nicotine from rat diaphragm muscle membranes with a Ki of 27.1 µM. These results suggest that trimethylsulfonium acts as an agonist on nicotinic receptors, and thus contracts frog skeletal rectus abdominis muscle and rat jejunum smooth muscle via stimulation of postjunctional and neuronal prejunctional nicotinic cholinoreceptors, respectively.

  12. Current knowledge on population studies on five continental molluscs (Mollusca, Gastropoda et Bivalvia of Santa Catarina State (SC, Central Southern Brazil region

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    A. Ignacio Agudo-Padrón

    2011-03-01

    Full Text Available Although still very scarce, available knowledge on population studies on continental (land and freshwatermolluscs in the territory of Santa Catarina State is shortly analyzed and discussed. Based on the IUCN“Restricted Distribution” criterion, a total of 54 nominal species, including 31 terrestrial gastropods, 15freshwater gastropods and 8 limnic bivalves, were considered strong candidates as threatened taxa. Out of allthese endangered species, only 5 limnic forms (2 gastropods and 3 bivalves were previously analysed, in someway, at population level.

  13. Effect of pollution on some freshwater species. I. histochemical and biochemical features of lead pollution on some organs of Viviparus viviparus L. (Mollusca Gastropoda)

    Energy Technology Data Exchange (ETDEWEB)

    Benedetti, I.; Benedetti, L.; Bolognani, L.; Bolognani Fantin, A.M.; Marini, M.; Ottaviani, E.

    1982-01-01

    Experimental lead pollution was studied in some organs (foot, mantle and digestive gland) of Viviparus viviparus L. The amount of lead contained after 48h, 96 h and one week of pollution were established using an atomic absorption spectrophotometer. On the basis of physicochemical determination, it turns out that lead is mainly concentrated in the mantle. The biochemical tests (cholesterol, sulpholipids and phospholipids) were aimed at evaluating the lipids involved in the membranes. The histochemical research was carried out chiefly to evaluate the modifications of polysaccharides and proteins. Some hydrolytic enzymes (Na+ and K+ dependent ATPase) and some ooreductive enzymes (NADH+ and NADPH+ dependent diaphorases, D-lactate dehydrogenase, succinate dehydrogenase and glucose-6-P-dehydrogenase) were also tested. The digestive gland is the most severely damaged organ as proved by histomorphological and biochemical analyses.

  14. A GUIDE TO FRESHWATER MOLLUSKS OF THE LAURENTIAN GREAT LAKES WITH SPECIAL EMPHASIS ON THE GENUS PISIDIUM

    Science.gov (United States)

    Presented here are keys and notes on distribution and ecology for the freshwater snails (Gastropoda), mussels (Unionidae), and fingernail clams (Sphaeriidae) which have been collected from the Laurentian Great Lakes. Including subspecies and forms, 121 taxa are discussed: 47 Gast...

  15. Records of Auger shells (Negastropoda: Terebridae) from Andaman and Nicobar Islands

    Digital Repository Service at National Institute of Oceanography (India)

    Ansari, Z.A.; Abidi, S.A.H.; Haridevi, C.K.

    2006-01-01

    although some have radular teeth and a poison sac like those of Hastula. As found here, Terebra most likely encompasses several different groups worthy of generic or subgeneric differentiation. Systematic account Phyllum : Mollusca Class : Gastropoda Order...

  16. MACROINVERTEBRATES COMPOSITION IN THE BLIZNEC STREAM, SECOND AND THIRD MAKSIMIR LAKE

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    Marina Piria

    2004-06-01

    Full Text Available Qualitative and quantitative macroinvertebrates in spring period was investigated during two years in the first and second Maksimir Lake and Bliznec stream. The domination of Gastropoda was outstanding at these three investigated sites. From time to time stronger development of Gastropoda, Bivalvia, Diptera and Crustacea was noted at the second Maksimir Lake. Gastropoda was dominant at the third Maksimir Lake (from 1.484 to 2.506 g m–2 while Crustacea, Oligochaeta and Hirudinea made important biomass. Species density in the Bliznec stream was quantitative higher than the one at other stations. The dominant group was Gastropoda (from 0.568 to 3.026 g m–2 and there was higher development of Trichoptera, Crustacea, Diptera, Heteroptera and Bivalvia (Table 3 and 4. Bliznec stream water quality, observed by biological method given by Kerovec, ranged from polluted to highly polluted.

  17. Mollusc fauna of the National Park Bavarian Forest (Germany).

    Czech Academy of Sciences Publication Activity Database

    Hlavá?, Jaroslav

    2010-01-01

    Ro?. 113, - (2010), s. 5-110. ISSN 0232-0738 Institutional research plan: CEZ:AV0Z30130516 Keywords : Gastropoda * Bivalvia * Red List of Bavaria * zoogeography * Macrogastra badia * Petasina edentula * Vertigo modesta arctica Subject RIV: EG - Zoology

  18. Habitats of relict terrestrial snails in southern Siberia: lessons for the reconstruction of palaeoenvironments of full-glacial Europe.

    Czech Academy of Sciences Publication Activity Database

    Horsák, M.; Chytrý, M.; Pokryszko, B. M.; Danihelka, Ji?í; Ermakov, B. V.; Hájek, Michal; Hájková, Petra; Kintrová, K.; Ko?í, M.; Kubešová, S.; Lustyk, P.; Otýpková, Z.; Pelánková, Barbora; Valachovi?, M.

    2010-01-01

    Ro?. 37, ?. 8 (2010), s. 1450-1462. ISSN 0305-0270 Institutional research plan: CEZ:AV0Z60050516 Keywords : Altai Mountains * climate * Gastropoda Subject RIV: EF - Botanics Impact factor: 4.273, year: 2010

  19. EXPLOTACIÓN, USOS Y ESTADO ACTUAL DE LA CIGUA O BURGAO CITTARIUM PICA (MOLLUSCA: GASTROPODA: TROCHIDAE)EN LA COSTA CONTINENTAL DEL CARIBE COLOMBIANO / EXPLOITATION, USES AND CURRENT STATUS OF THE WEST INDIAN TOPSHELL CITTARIUM PICA (MOLLUSCA: GASTROPODA, TROCHIDAE) ALONG THE COLOMBIAN CARIBBEAN COAST

    Scientific Electronic Library Online (English)

    Adriana, Osorno Arango; Juan M., Díaz Merlano.

    2006-12-01

    Full Text Available La cigua o burgao, Cittarium pica es un gasterópodo común y conspicuo de la zona intermareal del litoral rocoso del Caribe y ha sido utilizado como alimento por el hombre desde tiempos precolombinos. Aunque la extracción del recurso es realizada únicamente por pescadores artesanales y principalmente [...] para autoconsumo de pobladores locales, su abundancia se ha visto reducida notablemente durante los últimos diez años, por lo que la especie hace parte de la lista roja de fauna amenazada en varios países caribeños, incluido Colombia. El presente estudio tuvo por objeto hacer un diagnóstico del estado actual de la población de C. pica a lo largo de la costa continental del Caribe colombiano, así como una caracterización general de los niveles de explotación y usos en tiempos recientes. Para ello, la costa Caribe colombiana se dividió en cinco sectores de acuerdo al rango de distribución establecida para la especie: 1-Urabá chocoano, 2-Isla Fuerte, 3-Cartagena e Islas del Rosario, 4-Santa Marta y Parque Nacional Natural Tayrona, 5-La Guajira. En cada uno de los sectores se efectuaron encuestas a los pobladores locales. Se realizaron muestreos en una serie de estaciones representativas con el fin de determinar la abundancia, densidad y estructura de tallas de la población de C. pica. La presión por extracción que se ejerce sobre el recurso es variable entre los sectores, siendo mayor en Santa Marta y Parque Nacional Natural Tayrona, Urabá chocoano, y Cartagena e Islas del Rosario. El uso principal que se da al recurso es como complemento de la dieta de los pobladores locales, aunque en algunas ocasiones éstos también comercializan la carne y la concha. Las conchas se venden a artesanos que elaboran con ella objetos de bisutería y "souvenirs". La densidad ecológica promedio en toda el área de estudio fue 5.38 Ind/m² (± 0.82), con diferencias significativas tanto entre los sectores como entre las estaciones de un mismo sector. La estructura de tallas de la población (talla promedio = 25.08 mm ± 4.71, moda = 11.10 mm) indica que en general el recurso está sometido a sobreexplotación en el Caribe colombiano. Con ello, se confirma que C. pica enfrenta un riesgo de extinción en el mediano plazo en Colombia y debe mantenerse en la categoría de "vulnerable" en la lista roja de especies amenazadas del mismo país. Abstract in english The West Indian topshell, Cittarium pica is a common and conspicuous gastropod that thrives in Caribbean intertidal rocky shores and has been used for food by men since pre-Columbian times. Although, the exploitation of this resource is practiced only by artisanal fishermen and mainly for self-consu [...] mption, its abundance has noticeably reduced in the last ten years, so the species has been included in the endangered animal lists of several Caribbean countries, including Colombia. The present study was carried out to assess the current status of the population of C. pica along the Colombian Caribbean mainland and to describe the overall exploitation level and uses of this resource in recent times. In order to achieve so, Colombian Caribbean coast was divided into five zones according to the established distribution range of the species: 1-Urabá chocoano, 2-Isla Fuerte, 3-Cartagena and Rosario Islands, 4-Santa Marta and Tayrona Natural National Park, 5-La Guajira. In each one of the zones opinion polls among local inhabitants were conducted. A series of samples from representative stations were obtained in order to determine the abundance, density and size structure of the C. pica population. The fishing pressure on the resource is different between the sectors, being greater in Santa Marta and Tayrona Natural National Park, Urabá chocoano, and Cartagena and Rosario Islands. The main use given to C. pica is as dietary complement of the local population, but the flesh and shells are commercialized at times. Shells are sold to artisans and used for "souvenirs" and handcraft manufactures. The mean ecological density of C. pica in the entire study

  20. Estado del conocimiento de la durofagia en el registro fósil: interacción depredador-presa en moluscos marinos (Clases Gastropoda y Bivalvia) / State of the art of durophagy in the fossil record: predator-prey interactions in marine mollusks (classes Gastropoda and Bivalvia)

    Scientific Electronic Library Online (English)

    Catalina, Gómez-Espinosa; Raúl, Gío-Argáez; Miriam, Carreño de la Vega.

    Full Text Available La depredación como un mecanismo evolutivo, de diversificación y biomineralización es un tópico de gran interés. Un tipo específico de depredación es la durofagia que se define como el hábito alimenticio de los animales que consumen organismos con un esqueleto duro mineralizado, ya sea concha o exoe [...] squeleto. Los moluscos representan una fuente muy importante para examinar la depredación durófaga en el registro fósil debido a su distribución mundial, abundancia, buena preservación y a que habitan en una gran variedad de ambientes. En este trabajo se revisa el número de artículos publicados en revistas de circulación internacional que se enfocan en el tema de la durofagia y que tienen como potenciales presas a gasterópodos y bivalvos marinos fósiles. Se recuperaron y revisaron 101 artículos sobre este tema, enfocados en seis tipos de evidencia: perforación, reparación y fragmentación de la concha, mordidas, "punctures" y coprolitos. La mayoría de los ejemplos correspondieron a moluscos del Cenozoico. En general hay más registros en la zona tropical. Durante el Paleozoico, la mayoría de las veces, no se identificó el potencial depredador; esta tendencia continuó en el Mesozoico pero se reconoció la depredación de gasterópodos y bivalvos por parte de gasterópodos carnívoros, artrópodos, peces y reptiles. Durante el Cenozoico dominó la depredación por parte de gasterópodos natícidos y murícidos y se reconoció también la depredación por parte de artrópodos, peces y mamíferos. Abstract in english Predation as an evolutionary mechanism of diversification is a topic of great interest. Durophagy is the feeding behavior of preying on hard-shelled or exoskeleton-bearing organisms. On this matter, because of their worldwide distribution, abundance, wide range of habitats, and a remarkable preserva [...] tion frequency, mollusks are of particular interest in the study of predation in the fossil record. In the present work, papers published in international scientific magazines focusing on the issue of durophagy on fossil marine bivalve and gastropods as potential prey were analyzed. A total of 101 papers on this subject were reviewed. Six-kinds of evidence of durophagy were identified: drilling, repaired and fragmented shells, bites, punctures and coprolites. Most items are of Cenozoic age and the majority of the records available correspond to the tropics. Most Paleozoic potential predators were not identified; this situation extends to the Mesozoic, but predation of gastropods and bivalves by carnivorous gastropods, arthropods, fishes and reptiles was recognized. Predation by naticid and muricid gastropods prevails during the Cenozoic, also was recognized predation by arthropods, fishes and mammals.

  1. Utilization of shells of the snail Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda by the hermit crab Clibanarius vittatus (Bosc, 1802 (Decapoda, Anomura in the São Vicente Estuary, São Paulo, Brazil Utilización de conchas de caracoles terrestres Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda por el cangrejo ermitaño Clibanarius vittatus (Bosc, 1802 (Decapoda, Anomura en el estuario de São Vicente, São Paulo, Brasil

    Directory of Open Access Journals (Sweden)

    Bruno S. Sant'Anna

    2005-11-01

    Full Text Available Hermit crabs depend on mollusc shells for housing. In this study, an unusual resource is reported for a hermit crab that usually inhabits marine gastropod shells. During a field study conducted from May 2001 to April 2003 in an estuarine area in São Vicente, state of São Paulo, Brazil, 21 individuals of Clibanarius vittatus (Bosc, 1802 were found inhabiting the shells of the terrestrial gastropod Achatina fulica Bowdich, 1822. A. fulica occurs in nearshore grass patches, where occasional contact with sea water kills them, and their shells then become available to the hermit crabsEl cangrejo ermitaño depende de conchas de moluscos para hacer de ella su casa. Este estudio ha descubierto una manera inusual de como vive este cangrejo, que generalmente habita la concha de gastrópodos marinos. El estudio fue realizado en la estación marítima de São Vicente, provincia de São Paulo, de mayo de 2001 hasta abril de 2003. Durante ese periodo, un total de 21 cangrejos Clibanarius vittatus (Bosc, 1802 fueron encontrados viviendo en las conchas del caracol terrestre Achatina fulica Bowdich, 1822. A. fulica ocurre en áreas de césped cercanos a la costa, donde el contacto ocasional con el agua de mar provoca su muerte y sus conchas quedan disponibles para el cangrejo ermitaño

  2. Utilization of shells of the snail Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda) by the hermit crab Clibanarius vittatus (Bosc, 1802) (Decapoda, Anomura) in the São Vicente Estuary, São Paulo, Brazil / Utilización de conchas de caracoles terrestres Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda) por el cangrejo ermitaño Clibanarius vittatus (Bosc, 1802) (Decapoda, Anomura) en el estuario de São Vicente, São Paulo, Brasil

    Scientific Electronic Library Online (English)

    Bruno S., Sant' Anna; Cilene M., Zangrande; Alvaro L.D., Reigada.

    2005-11-01

    Full Text Available El cangrejo ermitaño depende de conchas de moluscos para hacer de ella su casa. Este estudio ha descubierto una manera inusual de como vive este cangrejo, que generalmente habita la concha de gastrópodos marinos. El estudio fue realizado en la estación marítima de São Vicente, provincia de São Paulo [...] , de mayo de 2001 hasta abril de 2003. Durante ese periodo, un total de 21 cangrejos Clibanarius vittatus (Bosc, 1802) fueron encontrados viviendo en las conchas del caracol terrestre Achatina fulica Bowdich, 1822. A. fulica ocurre en áreas de césped cercanos a la costa, donde el contacto ocasional con el agua de mar provoca su muerte y sus conchas quedan disponibles para el cangrejo ermitaño Abstract in english Hermit crabs depend on mollusc shells for housing. In this study, an unusual resource is reported for a hermit crab that usually inhabits marine gastropod shells. During a field study conducted from May 2001 to April 2003 in an estuarine area in São Vicente, state of São Paulo, Brazil, 21 individual [...] s of Clibanarius vittatus (Bosc, 1802) were found inhabiting the shells of the terrestrial gastropod Achatina fulica Bowdich, 1822. A. fulica occurs in nearshore grass patches, where occasional contact with sea water kills them, and their shells then become available to the hermit crabs

  3. Ocorrência e controle de lesmas do gênero Omalonyx (Gastropoda, Succineidae), pragas de capim-elefante Pennisetum purpureum (Poaceae) em Rio Preto da Eva, Amazonas / Occurrence and control of Omalonyx slugs (Gastropoda, Succineidae), pests of the elephant-grass Pennisetum purpureum (Poaceae) in Rio Preto da Eva, Amazonas

    Scientific Electronic Library Online (English)

    Marcos Vinicius Bastos, Garcia; Janine Oliveira, Arruda; Daniel Mansur, Pimpão; Terezinha Batista, Garcia.

    2012-06-01

    Full Text Available Lesmas do gênero Omalonyx d'Orbigny, 1837 são hermafroditas, herbívoras, de distribuição neotropical e vivem em plantas aquáticas, nas demais vegetações adjacentes e em solo úmido próximo a ambientes de água doce. No presente trabalho reporta-se a ocorrência atípica de O. pattersonae Tillier, 1981 e [...] de Omalonyx sp. em área de terra firme, distante de ambiente aquático. Estas espécies aqui reportadas são simpátricas e devido à alta densidade populacional e prejuízos causados às folhas do capim-elefante Pennisetum purpureum Schumach, são caracterizadas como pragas agrícolas. No período da noite as lesmas se alimentavam das folhas do capim elefante e durante o dia permaneciam escondidas na base do caule, próximo a superfície úmida do solo. A aplicação de cal hidratada sobre agregados de indivíduos de Omalonyx spp foi um método efetivo para o controle das populações. As alterações ambientais dos ecossistemas amazônicos para uso agrícola e/ou urbanização tem promovido o aumento populacional de espécies que se adaptam a novos habitats e geralmente se tornam pragas de difícil controle. Abstract in english Slugs of the genus Omalonyx d'Orbigny, 1837 are hermaphrodites, herbivorous, distributed on Neotropical regions, living on aquatic plants, moist soil and terrestrial vegetation close to freshwater systems. The present paper reports the atypical occurrence of O. pattersonae Tillier, 1981 and Omalonyx [...] sp. in an upland area far from any aquatic environment. Both species reported here are sympatric and due to the high populations density and damages caused on leaves of elephant-grass Pennisetum purpureum Schumach, they are recognized as agricultural pests. During the night, the slugs feed on the grass leaves and at the daylight they stayed hidden in the base of stems, near the moist soil surface. The use of hydrated lime distributed over the aggregations of Omalonyx spp. showed to be an effective method to control the populations. The environmental changes in the Amazonian ecosystems for agricultural or urban purposes have promoted the increase of populations of native species that adapt in the new habitat and usually become pests that are difficult to control.

  4. Individual growth of Heleobia piscium in natural populations (Gastropoda: Cochliopidae from the multiple use natural Reserve Isla Martin Garcia, Buenos Aires, Argentina Crescimento individual de Heleobia piscium em populações naturais (Gastropoda: Cochliopidae da Reserva Natural de usos múltiplos Ilha Martín García, Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    SM. Martin

    2008-08-01

    Full Text Available The present work analyses the individual growth of Heleobia piscium in natural conditions in coastal drainage channels of the Multiple Use Natural Reserve Isla Martín García, Buenos Aires, Argentina. Isla Martín García is located in the Upper Río de la Plata, to the south of the mouth of the Uruguay river (34° 11' 25" S and 58° 15' 38" W. Monthly collections were made from July 2005 to July 2006 in the eastern part of the island (Arena Beach. The population of H. piscium showed a complex and dynamic structure of sizes during a long period of the annual cycle. Two cohorts could be detected. The Bertalanffy growth equation was: Lt = 6 (1-e -1.85 (t+0.38 and Lt = 3.9 (1-e -0.19 (t+4.84 for cohorts 1 and 2, respectively. The pattern of population growth displayed a staggered model, where the greatest growth is observed during the summer. The reproductive period occurred during six months, from the beginning of summer to middle of fall. Based on only one reproductive effort, this pattern is not similar to that of other cogeneric species already studied.O presente trabalho analisa o crescimento individual de Heleobia piscium em condições naturais em poças costeiras da Reserva Natural de Usos Múltiplos Ilha Martín García, Buenos Aires, Argentina. A Ilha Martín García está localizada no Rio da Prata superior, ao sul da desembocadura do rio Uruguai (34° 11' 25" S e 58°15' 38" W. Amostras mensais foram analisadas entre os meses de julho de 2005 e julho de 2006, no setor este da ilha (Praia de Arena. A população de Heleobia piscium se caracterizou por uma complexa e dinâmica estrutura de talhas ao longo de grande parte do ciclo anual. Duas cohortes puderam ser detectadas. A equação de von Bertalanffy para a cohorte 1 foi: Lt = 6 (1-e -1.85 (t+0.38. Para a cohorte 2: Lt = 3.9 (1-e -0.19 (t+4.84. O padrão de desenvolvimento da população mostra um modelo escalonado, estendendo-se o período de maior crescimento durante toda a estação do verão. A temporada reprodutiva se manifestou durante seis meses, desde o princípio do verão até meados do outono. Este padrão baseado em um único esforço reprodutivo não se assemelha ao de outras espécies congenéricas já estudadas.

  5. Succinea peruviana (Gastropoda) en la dieta de la lagartija de las Lomas Microlophus tigris (Sauria) en la Reserva Nacional de Lachay, Lima, Perú / Succinea peruviana (Gastropoda) in the diet of the Lomas lizard Microlophus tigris (Sauria) from the Lachay National Reserve, Peru

    Scientific Electronic Library Online (English)

    José, Pérez Z.; Katya, Balta; Rina, Ramírez; Dora, Susanibar.

    Full Text Available El presente trabajo informa de la presencia del caracol Succinea peruviana en la dieta de la lagartija de las Lomas Microlophus tigris, la misma que habita el mesohábitat de Lomas con árboles en la Reserva Nacional de Lachay. Este es el primer informe del consumo de caracoles por lagartijas del Desi [...] erto Costero Peruano. Abstract in english We report the snail Succinea peruviana in the diet of the Lomas lizard Microlophus tigris, which inhabit the mesohabitat from the formation forested of Lomas in the Lachay National Reserve. This is the first report of snails in the diet of Peruvian coastal desert lizards. [...

  6. Occurrence of Aelurostrongylus abstrusus (Railliet, 1898) larvae (Nematoda: Metastrongylidae) infecting Achatina (Lissachatina) fulica Bowdich, 1822 (Mollusca: Gastropoda) in the Amazon region / Ocorrência de Aelurostrongylus abstrusus (Railliet, 1898) (Nematoda: Metastrongylidae) infectando o Achatina (Lissachatina) fulica Bowdich, 1822 (Mollusca: Gastropoda) na região amazônica

    Scientific Electronic Library Online (English)

    Sanny Maria de, Andrade-Porto; Kelly Cristina Pereira de, Souza; Melissa Querido, Cárdenas; Rosemary A., Roque; Daniel Mansur, Pimpão; Cleusa Suzana, Araújo; José Celso de Oliveira, Malta.

    2012-06-01

    Full Text Available Achatina fulica ou "caramujo africano" é uma espécie exótica, considerada uma das cem piores espécies invasoras do mundo, causando sérios danos ambientais. No presente estudo foi registrado, pela primeira vez, a ocorrência do Aelurostrongylus abstrusus infectando o A.fulica na região amazônica. Esse [...] nematóide é descrito parasitando principalmente o sistema pulmonar de felinos, causando a "aelurostrongilose", também conhecida como estrongiloidose cardio-pulmonar felina. Novos dados morfométricos de larvas de terceiro estágio são apresentados. Dos 45 caramujos coletados, 40% estavam infectados por larvas de A. abstrusus. Especimens de Achatina fulica foram coletados em três áreas da cidade de Manaus: rural, leste e oeste. A zona leste apresentou a maior prevalência de 80%. O grande número de A.fulica encontrado em áreas habitadas aumenta as chances de ocorrência de zoonoses emergentes e destaca a necessidade de mais estudos para o melhor controle da doença. Abstract in english Achatina fulica or "giant African snail" is an exotic species, considered to be one of the world's hundred most invasive species, causing serious environmental damages. In the present study we report, for the first time, the occurrence of Aelurostrongylus abstrusus infecting A.fulica in the Amazon r [...] egion. This nematode is described parasitizing mainly the pulmonary system of felines, which causes "aelurostrongilose", also known as feline cardio-pulmonary strongyloidosis. New morphometric data of third stage larvae are presented herein. The present study demonstrated that 40% of all the snails were infected by A. abstrusus. Achatina fulica specimens were collected from three different areas in Manaus namely: rural; east and west areas. The east area presents the highest prevalence of 80%. The large number of A.fulica found in inhabited areas increases the chances of emergent zoonoses, which highlights the need of further studies so as to better control this disease.

  7. Occurrence of Aelurostrongylus abstrusus (Railliet, 1898 larvae (Nematoda: Metastrongylidae infecting Achatina (Lissachatina fulica Bowdich, 1822 (Mollusca: Gastropoda in the Amazon region Ocorrência de Aelurostrongylus abstrusus (Railliet, 1898 (Nematoda: Metastrongylidae infectando o Achatina (Lissachatina fulica Bowdich, 1822 (Mollusca: Gastropoda na região amazônica

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    Sanny Maria de Andrade-Porto

    2012-06-01

    Full Text Available Achatina fulica or "giant African snail" is an exotic species, considered to be one of the world's hundred most invasive species, causing serious environmental damages. In the present study we report, for the first time, the occurrence of Aelurostrongylus abstrusus infecting A.fulica in the Amazon region. This nematode is described parasitizing mainly the pulmonary system of felines, which causes "aelurostrongilose", also known as feline cardio-pulmonary strongyloidosis. New morphometric data of third stage larvae are presented herein. The present study demonstrated that 40% of all the snails were infected by A. abstrusus. Achatina fulica specimens were collected from three different areas in Manaus namely: rural; east and west areas. The east area presents the highest prevalence of 80%. The large number of A.fulica found in inhabited areas increases the chances of emergent zoonoses, which highlights the need of further studies so as to better control this disease.Achatina fulica ou "caramujo africano" é uma espécie exótica, considerada uma das cem piores espécies invasoras do mundo, causando sérios danos ambientais. No presente estudo foi registrado, pela primeira vez, a ocorrência do Aelurostrongylus abstrusus infectando o A.fulica na região amazônica. Esse nematóide é descrito parasitando principalmente o sistema pulmonar de felinos, causando a "aelurostrongilose", também conhecida como estrongiloidose cardio-pulmonar felina. Novos dados morfométricos de larvas de terceiro estágio são apresentados. Dos 45 caramujos coletados, 40% estavam infectados por larvas de A. abstrusus. Especimens de Achatina fulica foram coletados em três áreas da cidade de Manaus: rural, leste e oeste. A zona leste apresentou a maior prevalência de 80%. O grande número de A.fulica encontrado em áreas habitadas aumenta as chances de ocorrência de zoonoses emergentes e destaca a necessidade de mais estudos para o melhor controle da doença.

  8. Morfologia do sistema muscular e do sistema reprodutor de Anisancylus obliquus (Broderip & Sowerby do Chile, como contribuição à sistemática de Ancylidae (Gastropoda, Pulmonata, Basommatophora Morphology of the muscular and reproductive systems of Anisancylus obliquus (Broderip & Sowerby from Chile as a contribution to the systematics of Ancylidae (Gastropoda, Pulmonata, Basommatophora

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    Sonia Barbosa dos Santos

    2000-12-01

    Full Text Available A study on the morphology of the muscular and reproductive systems of Anisancylus obliquus (Broderip & Sowerby, 1832 based on specimens from Chile is presented. Differences are observed in the number of folicules of the ovotestis and prostata when comparing them with specimens from Brazil (chilean specimens: ovotestis = 28 to 32; prostata = 3 to 5; brazilian specimens: ovotestis = 20 to 21; prostata = 6 to 8. In the muscular system, the right aductor muscle scar is often longer than in brazilian specimens. The general morphology of muscular and reproductive systems is similar to that observed to Uncancylus concentricus (d'Orbigny, 1835 and Gundlachia dutrae Santos, 1994 (V-shaped adhesive area; single right anterior muscle with elongated moon-shaped scar; ejaculatory complex with projected ejaculatory duct and differs from G. ticaga (Marcus & Marcus, 1962, G. radiata (Guilding, 1828 and Hebetancylus moricandi (d'Orbigny, 1837 (elongated adhesive area; double right anterior muscle with rounded or oval-shaped muscle scar and ejaculatoiy complex without projected ejaculatory duct. Differences are also observed when comparing them with Ancylus fluviatilis Müller, 1774 where the right muscle scar is continuous with the posterior one, whereas A. obliquus shows three well defined muscle scars. The ejaculatory system of A. fluviatilis presents flagellum duct and ejaculatory duct opening apart into the sheath; there are penis, prepuce with muscular pillars and a muscular flagellum, whereas A. obliquus shows the flagellum duct and ejaculatory duct reaching the sheath together; there are not penis and muscular pillars on prepuce; the flagellum is glandular. These differences shows A. obliquus and others neotropical pateliforms basommatophorans are not closely related to european Ancylus.

  9. Lista preliminar de los Punctoideos de Rio Grande do Sul, Brasil, con descripción de dos especies nuevas (Mollusca, Gastropoda, Stylommatophora Preliminar list of the Punctoidea from the State of Rio Grande do Sul, Brazil, with description of two new species (Mollusca, Gastropoda, Stylommatophora

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    Sergio Eduardo Miquel

    2004-12-01

    Full Text Available Se presenta una lista parcial de gasterópodos terrestres Punctoideos del "Centro de Pesquisas e Conservação da Natureza Pró-Mata" (São Francisco de Paula, Estado de Rio Grande do Sul, Brazil (CPCN-PM. Esta lista incluye siete especies, dos de ellas son nuevas. El CPCN-PM se localiza entre los 600 y 950 m de altitud; presenta clima templado superhúmedo a húmedo, lluvias de 2.250 mm anuales y temperatura promedio anual de 14,5ºC; están presentes tres regiones fitoecológicas principales, floresta ombrófila mixta, floresta ombrófila densa y sabana. Los taxones hallados son: Rotadiscus amancaezensis (Hidalgo, 1869, Lilloiconcha tucumana (Hylton Scott, 1963, Radiodiscus cuprinus Fonseca & Thomé, 2000, Radiodiscus tenellus Hylton Scott, 1957, Radiodiscus promatensis sp. nov., Zilchogyra gordurasensis (Thiele, 1927 y Zilchogyra zulmae sp. nov. La conchilla de R. promatensis sp. nov. es muy pequeña, casi plana, con ombligo muy desarrollado, abertura reniforme, con estrías espirales en la teleoconcha y 58-62 costillas axiales en el último anfracto. La conchilla de Z. zulmae sp. nov. es troquiforme alta, con cinco anfractos con fuertes y espaciadas costillas axiales (25-38, ombligo amplio y perspectivo y abertura subcircular angulosa. La fauna de gasterópodos carópidos del CPCN-PM tiene tres especies conocidas sólo del área (R. cuprinus, R. promatensis sp. nov. y Z. zulmae sp. nov., una, que se distribuye también en Paraguay (R. tenellus y tres (L. tucumana, R. amancaezensis y Z. gordurasensis, comunes a otras áreas de América del Sur, principalmente la región de las Yungas.The partial list of the land snails Punctoidea from the "Centro de Pesquisas e Conservação da Natureza Pró-Mata" (São Francisco de Paula, State of Rio Grande do Sul, Brazil (CPCN-PM is presented herein. This list includes seven species, two of them new. The CPCN-PM is located between 600 and 950 m of altitude; it has a temperate super humid to humid climate, with 2,250 mm of annual rainfall and means annual temperature of 14.5ºC; three main phytoecological regions are present -mixed ombrophile forest, dense ombrophile forest and savanna. The taxa found are: Rotadiscus amancaezensis (Hidalgo, 1869, Lilloiconcha tucumana (Hylton Scott, 1963, Radiodiscus cuprinus Fonseca & Thomé, 2000, Radiodiscus tenellus Hylton Scott, 1957, Radiodiscus promatensis sp. nov., Zilchogyra gordurasensis (Thiele, 1927 and Zilchogyra zulmae sp. nov. The shell of R. promatensis sp. nov. is very small, almost flat, with very wide umbilicus, reniform aperture, teleoconch with spiral striae and 58-62 axial ribs on the body whorl. The shell of Z. zulmae sp. nov. is trochiform elevated, with five whorls with strong and widely spaced axial ribs (25-38, wide and perspective umbilicus and sub circular angled aperture. The charopid gastropod fauna from the CPCN-PM has three species known only from there (R. cuprinus, R. promatensis sp. nov. and Z. zulmae sp. nov., another one with previous known distribution only in Paraguay (R. tenellus and three common species (L. tucumana, R. amancaezensis and Z. gordurasensis with distribution in other South American areas -mainly Yungas forests.

  10. Lista preliminar de los Punctoideos de Rio Grande do Sul, Brasil, con descripción de dos especies nuevas (Mollusca, Gastropoda, Stylommatophora) / Preliminar list of the Punctoidea from the State of Rio Grande do Sul, Brazil, with description of two new species (Mollusca, Gastropoda, Stylommatophora)

    Scientific Electronic Library Online (English)

    Sergio Eduardo, Miquel; Rina, Ramírez; José Willibaldo, Thomé.

    2004-12-01

    Full Text Available Se presenta una lista parcial de gasterópodos terrestres Punctoideos del "Centro de Pesquisas e Conservação da Natureza Pró-Mata" (São Francisco de Paula, Estado de Rio Grande do Sul, Brazil) (CPCN-PM). Esta lista incluye siete especies, dos de ellas son nuevas. El CPCN-PM se localiza entre los 600 [...] y 950 m de altitud; presenta clima templado superhúmedo a húmedo, lluvias de 2.250 mm anuales y temperatura promedio anual de 14,5ºC; están presentes tres regiones fitoecológicas principales, floresta ombrófila mixta, floresta ombrófila densa y sabana. Los taxones hallados son: Rotadiscus amancaezensis (Hidalgo, 1869), Lilloiconcha tucumana (Hylton Scott, 1963), Radiodiscus cuprinus Fonseca & Thomé, 2000, Radiodiscus tenellus Hylton Scott, 1957, Radiodiscus promatensis sp. nov., Zilchogyra gordurasensis (Thiele, 1927) y Zilchogyra zulmae sp. nov. La conchilla de R. promatensis sp. nov. es muy pequeña, casi plana, con ombligo muy desarrollado, abertura reniforme, con estrías espirales en la teleoconcha y 58-62 costillas axiales en el último anfracto. La conchilla de Z. zulmae sp. nov. es troquiforme alta, con cinco anfractos con fuertes y espaciadas costillas axiales (25-38), ombligo amplio y perspectivo y abertura subcircular angulosa. La fauna de gasterópodos carópidos del CPCN-PM tiene tres especies conocidas sólo del área (R. cuprinus, R. promatensis sp. nov. y Z. zulmae sp. nov.), una, que se distribuye también en Paraguay (R. tenellus) y tres (L. tucumana, R. amancaezensis y Z. gordurasensis), comunes a otras áreas de América del Sur, principalmente la región de las Yungas. Abstract in english The partial list of the land snails Punctoidea from the "Centro de Pesquisas e Conservação da Natureza Pró-Mata" (São Francisco de Paula, State of Rio Grande do Sul, Brazil) (CPCN-PM) is presented herein. This list includes seven species, two of them new. The CPCN-PM is located between 600 and 950 m [...] of altitude; it has a temperate super humid to humid climate, with 2,250 mm of annual rainfall and means annual temperature of 14.5ºC; three main phytoecological regions are present -mixed ombrophile forest, dense ombrophile forest and savanna. The taxa found are: Rotadiscus amancaezensis (Hidalgo, 1869), Lilloiconcha tucumana (Hylton Scott, 1963), Radiodiscus cuprinus Fonseca & Thomé, 2000, Radiodiscus tenellus Hylton Scott, 1957, Radiodiscus promatensis sp. nov., Zilchogyra gordurasensis (Thiele, 1927) and Zilchogyra zulmae sp. nov. The shell of R. promatensis sp. nov. is very small, almost flat, with very wide umbilicus, reniform aperture, teleoconch with spiral striae and 58-62 axial ribs on the body whorl. The shell of Z. zulmae sp. nov. is trochiform elevated, with five whorls with strong and widely spaced axial ribs (25-38), wide and perspective umbilicus and sub circular angled aperture. The charopid gastropod fauna from the CPCN-PM has three species known only from there (R. cuprinus, R. promatensis sp. nov. and Z. zulmae sp. nov.), another one with previous known distribution only in Paraguay (R. tenellus) and three common species (L. tucumana, R. amancaezensis and Z. gordurasensis) with distribution in other South American areas -mainly Yungas forests.

  11. Recaracterização do subgênero Toltecia Pilsbry com descrição da conquiliomorfologia e anatomia dos sistemas excretor e reprodutor de Punctum (Toltecia) Pilsbryi (Scott), n.comb. (Gastropoda, Stylommatophora, Punctidae) / Recharacterization of the subgenus Toltecia Pilsbry with conchomorphology and anatomy of the excretory and reproductive systems of Punctum (Toltecia) Pilsbryi (Scott), n.comb. (Gastropoda, Stylommatophora, Punctidae)

    Scientific Electronic Library Online (English)

    Álvaro Luís Müller da, Fonseca; José Willibaldo, Thomé.

    Full Text Available [...] Abstract in english Conchomorphological and anatomic characteristics of species from Punctum (Toltecia) are presented and discussed. The brief recharacterization about the conchomorphology and internal anatomy of Toltecia with related species from this subgenus is presented. The data from this species are compared with [...] other related species from Punctidae, Helicodiscidae and Charopidae. Punctum (Toltecia) pilsbryi, n.comb. is redescribed and its shells features was analyzed by SEM (Scanning Electron Microscope) and commented, as well as the shells dimensions; the anatomy of the excretory and reproductive systems are described too. The anatomic characteristics, mainly from excretory system, characterize Punctum (Toltecia) pilsbryi, n.comb. like Punctidae.

  12. Recaracterização do subgênero Toltecia Pilsbry com descrição da conquiliomorfologia e anatomia dos sistemas excretor e reprodutor de Punctum (Toltecia Pilsbryi (Scott, n.comb. (Gastropoda, Stylommatophora, Punctidae Recharacterization of the subgenus Toltecia Pilsbry with conchomorphology and anatomy of the excretory and reproductive systems of Punctum (Toltecia Pilsbryi (Scott, n.comb. (Gastropoda, Stylommatophora, Punctidae

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    Álvaro Luís Müller da Fonseca

    1995-01-01

    Full Text Available Conchomorphological and anatomic characteristics of species from Punctum (Toltecia are presented and discussed. The brief recharacterization about the conchomorphology and internal anatomy of Toltecia with related species from this subgenus is presented. The data from this species are compared with other related species from Punctidae, Helicodiscidae and Charopidae. Punctum (Toltecia pilsbryi, n.comb. is redescribed and its shells features was analyzed by SEM (Scanning Electron Microscope and commented, as well as the shells dimensions; the anatomy of the excretory and reproductive systems are described too. The anatomic characteristics, mainly from excretory system, characterize Punctum (Toltecia pilsbryi, n.comb. like Punctidae.

  13. Ocorrência no Brasil de Thiara (Melanoides tuberculata (O.F. Muller, 1774 (Gastropoda, Prosobranchia, primeiro hospedeiro intermediário de Clonorchis sinensis (Cobbold, 1875 (Trematoda, Plathyhelmintes Occurrence of Thiara (Melanoides tuberculata (O.F. Mullher, 1774 (Gastropoda, Prosobranchia in Brazil, first intermediate host of Clonorchis sinensis (Cobbold, 1875 (Trematoda, Plathyhelmintes

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    Jorge Faria Vaz

    1986-08-01

    Full Text Available Relata-se a introdução em nosso meio de Thiara (Melanoides tuberculata possivelmente anterior a 1967, quando pela primeira vez foi coletada em Santos. Essa espécie pode comportar-se como primeiro hospedeiro intermediário de Paragonimus westermani e de Clonorchis sinensis. Somente o último trematódeo tem alguma possibilidade de vir a parasitar o homem, em nosso meio.Introduction of Thiara (Melanoides tuberculata in Brazil, is reported. This introduction may go back prior to 1967 when some specimens were collected at Santos, S.Paulo (Brazil. T. (M. tuberculata is an intermediate host of Paragonimus westermani and Clonorchis sinensis, both pathogenic for man. Only this last trematode has some potential for human infection in Brazil.

  14. Bait formulations of molluscicides and their effects on biochemical changes in the ovotestis of snail Lymnaea acuminata (Mollusca; Gastropoda:Lymnaeidae) / Formulações de iscas de moluscicidas e seus efeitos sobre as alterações bioquímicas no ovoteste do caramujo Lymnaea acuminata (Mollusca;Gastropoda:Lymnaeidae)

    Scientific Electronic Library Online (English)

    Pradeep, Kumar; Vinay Kumar, Singh; D.K., Singh.

    2011-10-01

    Full Text Available Foi estudado o efeito subletal das iscas usadas para alimentação contendo componentes moluscicidas de Ferula asafoetida (ácido ferúlico, umbeliferone), Syzygium aromaticum (eugenol) e Carum carvi (limonene) nas alterações bioquímicas do ovoteste do caramujo Lymnaea acuminata. A formulação das iscas [...] usadas para alimentar L. acuminata foi estudada em aquários de vidros transparentes de diâmetro de 30 cm. As iscas foram preparadas por combinações diferentes binárias de aminoácidos (valina, ácido aspártico, lisina e alanina 10 mM) em 100 mL de solução de agar a 2% + doses subletais (20% e 60% durante 24 horas LC50) de diferentes moluscicidas (ácido ferúlico, umbeliferone, eugenol e limonene). Estas iscas causaram redução significante máxima em aminoácidos livres, proteínas, níveis de DNA e RNA isto é 41,37%, 23,56%, 48,36% e 14,29% de controle no ovoteste do caramujo, respectivamente. Discontinuação da alimentação depois do tratamento de 60% de 96 horas de LC50 do moluscicida contendo a isca para as subsequentes 72 horas causou significante recuperação dos níveis de aminoácidos livres, proteína, DNA e RNA no ovoteste da L. acuminata. Abstract in english The effect of sub-lethal feeding of bait formulations containing molluscicidal component of Ferula asafoetida (ferulic acid, umbelliferone), Syzygium aromaticum (eugenol) and Carum carvi (limonene) on biochemical changes in the ovotestis of snail Lymnaea acuminata were studied. Bait formulations fee [...] ding to L. acuminata were studied in clear glass aquaria having diameter of 30 cm. Baits were prepared from different binary combinations of attractant amino acid (valine, aspartic acid, lysine and alanine 10 mM) in 100 mL of 2% agar solution + sub-lethal (20% and 60% of 24h LC50) doses of different molluscicides (ferulic acid, umbelliferone, eugenol and limonene). These baits caused maximum significant reduction in free amino acid, protein, DNA, RNA levels i.e. 41.37, 23.56, 48.36 and 14.29% of control in the ovotestis of the snail, respectively. Discontinuation of feeding after treatment of 60% of 96h LC50 of molluscicide containing bait for next 72h caused a significant recovery in free amino acid, protein, DNA and RNA levels in the ovotestis of L. acuminata.

  15. Bait formulations of molluscicides and their effects on biochemical changes in the ovotestis of snail Lymnaea acuminata (Mollusca; Gastropoda:Lymnaeidae Formulações de iscas de moluscicidas e seus efeitos sobre as alterações bioquímicas no ovoteste do caramujo Lymnaea acuminata (Mollusca;Gastropoda:Lymnaeidae

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    Pradeep Kumar

    2011-10-01

    Full Text Available The effect of sub-lethal feeding of bait formulations containing molluscicidal component of Ferula asafoetida (ferulic acid, umbelliferone, Syzygium aromaticum (eugenol and Carum carvi (limonene on biochemical changes in the ovotestis of snail Lymnaea acuminata were studied. Bait formulations feeding to L. acuminata were studied in clear glass aquaria having diameter of 30 cm. Baits were prepared from different binary combinations of attractant amino acid (valine, aspartic acid, lysine and alanine 10 mM in 100 mL of 2% agar solution + sub-lethal (20% and 60% of 24h LC50 doses of different molluscicides (ferulic acid, umbelliferone, eugenol and limonene. These baits caused maximum significant reduction in free amino acid, protein, DNA, RNA levels i.e. 41.37, 23.56, 48.36 and 14.29% of control in the ovotestis of the snail, respectively. Discontinuation of feeding after treatment of 60% of 96h LC50 of molluscicide containing bait for next 72h caused a significant recovery in free amino acid, protein, DNA and RNA levels in the ovotestis of L. acuminata.Foi estudado o efeito subletal das iscas usadas para alimentação contendo componentes moluscicidas de Ferula asafoetida (ácido ferúlico, umbeliferone, Syzygium aromaticum (eugenol e Carum carvi (limonene nas alterações bioquímicas do ovoteste do caramujo Lymnaea acuminata. A formulação das iscas usadas para alimentar L. acuminata foi estudada em aquários de vidros transparentes de diâmetro de 30 cm. As iscas foram preparadas por combinações diferentes binárias de aminoácidos (valina, ácido aspártico, lisina e alanina 10 mM em 100 mL de solução de agar a 2% + doses subletais (20% e 60% durante 24 horas LC50 de diferentes moluscicidas (ácido ferúlico, umbeliferone, eugenol e limonene. Estas iscas causaram redução significante máxima em aminoácidos livres, proteínas, níveis de DNA e RNA isto é 41,37%, 23,56%, 48,36% e 14,29% de controle no ovoteste do caramujo, respectivamente. Discontinuação da alimentação depois do tratamento de 60% de 96 horas de LC50 do moluscicida contendo a isca para as subsequentes 72 horas causou significante recuperação dos níveis de aminoácidos livres, proteína, DNA e RNA no ovoteste da L. acuminata.

  16. What can we learn from confusing Olivella columellaris and O. semistriata (Olivellidae, Gastropoda), two key species in panamic sandy beach ecosystems? / ¿Qué podemos aprender de la confusión de la Olivella columellaris y la O. semistriata (Olivellidae, Gastropoda), dos especies con un papel clave en los ecosistemas de las playas arenosas panamicas?

    Scientific Electronic Library Online (English)

    Alison I., Troost; Samantha D., Rupert; Ariel Z., Cyrus; Frank V., Paladino; Benjamin F., Dattilo; Winfried S., Peters.

    2012-06-01

    Full Text Available La Olivella columellaris (Sowerby 1825) y la O. semistriata (Gray 1839) son caracoles filtradores que navegan en la zona de vaivén de las playas arenosas tropicales del Pacífico oriental. Si bien son frecuentemente el elemento macrofáunico dominante en su habitat, su biología está insuficientemente [...] entendida; de hecho, las dos especies han sido confundidas en las pocas publicaciones que han tratado de su ecología. La identificación equivocada tanto en las publicaciones como en las colecciones ha contribuido también a sobrestimar el solapamiento geográfico de las dos especies. Para proporcionar una base taxonómica segura para futuras investigaciones funcionales, evolutivas y ecológicas, evaluamos la validez de los rasgos diagnósticos en poblaciones silvestres y en colecciones museísticas, y definimos criterios de identificación para ser usados. El análisis morfométrico mostró que el crecimiento de la concha es alométrico en la O. columellaris pero isométrico en la O. semistriata, lo que sugiere que las dos especies siguen programas de desarrollo diferentes. La confusión taxonómica se ha visto agravada por la existencia de poblaciones de O. semistriata enanas, que fueron originalmente descritas como una especie separada: O. attenuata (Reeve 1850). En nuestro sitio de estudio en Costa Rica, la ocurrencia de tales poblaciones enanas se correlaciona con olas de baja energía, y no con la presión de depredación ni con disturbios antropogénicos, lo que indica una plasticidad ecológica considerable en el desarrollo de la O. semistriata. Abstract in english Olivella columellaris (Sowerby 1825) and O. semistriata (Gray 1839) are suspension-feeding, swash-surfing snails on tropical sandy beaches of the east Pacific. While they often are the numerically dominant macrofaunal element in their habitats, their biology is poorly understood; the two species act [...] ually have been confused in all of the few publications that address their ecology. Frequent misidentifications in publications and collections contributed also to an overestimation of the geographic overlap of the two species. To provide a sound taxonomic basis for further functional, ecological, and evolutionary investigations, we evaluated the validity of diagnostic traits in wild populations and museum collections, and defined workable identification criteria. Morphometric analysis demonstrated that shell growth is allometric in O. columellaris but isometric in O. semistriata, suggesting that the species follow distinct developmental programs. The taxonomic confusion is aggravated by the existence of populations of dwarfish O. semistriata, which originally had been described as a separate species, O. attenuata (Reeve 1851). At our Costa Rican study sites, the occurrence of such dwarfish populations correlates with low wave energies but not with predation pressure and anthropogenic disturbances, indicating significant ecological plasticity in the development of O. semistriata.

  17. El loco Concholepas concholepas (Bruguière, 1789) (Mollusca: Gastropoda: Muricidae) como recurso durante el Holoceno Temprano-Medio en Los Vilos, Chile central / El loco Concholepas concholepas (Bruguière, 1789) (Mollusca: Gastropoda: Muricidae) during the Early-Middle Holocene of Los Vilos, central Chile

    Scientific Electronic Library Online (English)

    Pedro, Báez; Javier, Arata; Donald, Jackson.

    Full Text Available Se estudió la abundancia relativa del loco, Concholepas concholepas, y las causas posibles de su variabilidad en los conchales culturales más antiguos del Holoceno Temprano-Medio del litoral de Los Vilos (31º55'S, 71º32'W). Las muestras se obtuvieron en excavaciones arqueológicas de cinco sitios y s [...] e dataron con C14: Punta Purgatorio (LV079: 10.040 ± 70 años antes del presente, a.a.p.), Caleta Ñagué (LV098: 10.120 ± 80 a.a.p.), Dunas de Agua Amarilla (LV166: 6.700 ± 60 a.a.p.), Borde Norte de Quebrada de Quereo (LV036, 6.030 ± 80 a.a.p.) y Fundo Agua Amarilla (LV099: 5.480 ± 70 a.a.p.). Las conchas corresponden a ejemplares juveniles y adultos jóvenes, cuyas tallas varían entre 20 y 145 mm. Este amplio rango de tamaño refleja que los recolectores que formaron los conchales extrajeron los moluscos sin selección de tallas. La mayoría de los especímenes son de talla superior a 50 mm, longitud que corresponde a la talla de primera madurez en las poblaciones de locos actuales. La abundancia de esta especie en los conchales es mayor en los sitios más recientes: 46.200 ejemplares en LV166 y 4.185.000 en LV036. La variabilidad observada en los registros sustenta la hipótesis que éstos fueron motivados por cambios paleoclimáticos que afectaron directamente las características ecológicas de la región, las que influyeron, indirectamente, en la extracción de las especies Abstract in english The relative abundance of "el loco", Concholepas concholepas, and the possible causes of its variability in cultural shell deposits dated from the Early-Middle Holocene of Los Vilos littoral (31º55'S, 71º32'W) were studied. The samples were obtained in archaeologic excavations from five sites. These [...] samples were dated with C14: Punta Purgatorio (LV079: 10.040 ± 70 years before present, y.b.p.), Caleta Ñagué (LV098: 10.120 ± 80 y.b.p.), Dunas de Agua Amarilla (LV166: 6.700 ± 60 y.b.p.), Borde Norte de Quebrada de Quereo (LV036: 6.030 ± 80 y.b.p.) and Fundo Agua Amarilla (LV099: 5.480 ± 70 y.b.p.). These gastropod shells correspond to juvenile and young adult specimens, whose lengths oscillate between 20 and 145 mm. The wide range of sizes found indicates that collectors did not make mollusk selection by sizes during the captures. The majority of these specimens are of a size longer than 50 mm. This latter length corresponds to first maturity size found in current Concholepas concholepas populations. The abundance of this species in the shellmidden is greater in the most recent sites: 46,200 specimens in LV166 and 4,185,000 in LV036. The variability in the records substantiates the hypothesis that the principal cause in the observed changes was originated in palaeoclimatic changes that affected directly the ecologic characteristics of the region, and influenced, indirectly, the species extraction

  18. El loco Concholepas concholepas (Bruguière, 1789 (Mollusca: Gastropoda: Muricidae como recurso durante el Holoceno Temprano-Medio en Los Vilos, Chile central El loco Concholepas concholepas (Bruguière, 1789 (Mollusca: Gastropoda: Muricidae during the Early-Middle Holocene of Los Vilos, central Chile

    Directory of Open Access Journals (Sweden)

    Pedro Báez

    2004-01-01

    Full Text Available Se estudió la abundancia relativa del loco, Concholepas concholepas, y las causas posibles de su variabilidad en los conchales culturales más antiguos del Holoceno Temprano-Medio del litoral de Los Vilos (31º55'S, 71º32'W. Las muestras se obtuvieron en excavaciones arqueológicas de cinco sitios y se dataron con C14: Punta Purgatorio (LV079: 10.040 ± 70 años antes del presente, a.a.p., Caleta Ñagué (LV098: 10.120 ± 80 a.a.p., Dunas de Agua Amarilla (LV166: 6.700 ± 60 a.a.p., Borde Norte de Quebrada de Quereo (LV036, 6.030 ± 80 a.a.p. y Fundo Agua Amarilla (LV099: 5.480 ± 70 a.a.p.. Las conchas corresponden a ejemplares juveniles y adultos jóvenes, cuyas tallas varían entre 20 y 145 mm. Este amplio rango de tamaño refleja que los recolectores que formaron los conchales extrajeron los moluscos sin selección de tallas. La mayoría de los especímenes son de talla superior a 50 mm, longitud que corresponde a la talla de primera madurez en las poblaciones de locos actuales. La abundancia de esta especie en los conchales es mayor en los sitios más recientes: 46.200 ejemplares en LV166 y 4.185.000 en LV036. La variabilidad observada en los registros sustenta la hipótesis que éstos fueron motivados por cambios paleoclimáticos que afectaron directamente las características ecológicas de la región, las que influyeron, indirectamente, en la extracción de las especiesThe relative abundance of "el loco", Concholepas concholepas, and the possible causes of its variability in cultural shell deposits dated from the Early-Middle Holocene of Los Vilos littoral (31º55'S, 71º32'W were studied. The samples were obtained in archaeologic excavations from five sites. These samples were dated with C14: Punta Purgatorio (LV079: 10.040 ± 70 years before present, y.b.p., Caleta Ñagué (LV098: 10.120 ± 80 y.b.p., Dunas de Agua Amarilla (LV166: 6.700 ± 60 y.b.p., Borde Norte de Quebrada de Quereo (LV036: 6.030 ± 80 y.b.p. and Fundo Agua Amarilla (LV099: 5.480 ± 70 y.b.p.. These gastropod shells correspond to juvenile and young adult specimens, whose lengths oscillate between 20 and 145 mm. The wide range of sizes found indicates that collectors did not make mollusk selection by sizes during the captures. The majority of these specimens are of a size longer than 50 mm. This latter length corresponds to first maturity size found in current Concholepas concholepas populations. The abundance of this species in the shellmidden is greater in the most recent sites: 46,200 specimens in LV166 and 4,185,000 in LV036. The variability in the records substantiates the hypothesis that the principal cause in the observed changes was originated in palaeoclimatic changes that affected directly the ecologic characteristics of the region, and influenced, indirectly, the species extraction

  19. Avaliação da atividade moluscicida do látex de três espécies de Euphorbia (Euphorbiaceae sobre Leptinaria unilamellata d'Orbigny, 1835 (Gastropoda - Subulinidae Assessment of moluscicidal activity of the latex of three Euphorbia (Euphorbiaceae species on Leptinaria unilamellata d'Obigny 1835 (Gastropoda - Subulinidae

    Directory of Open Access Journals (Sweden)

    I.S Afonso-Neto

    2010-03-01

    Full Text Available Gastrópodes pulmonados terrestres podem atuar como hospedeiros intermediários de helmintos. Os primeiros registros do controle químico desses invertebrados datam do início do século XX e as substâncias utilizadas eram toxinas inespecíficas já empregadas no controle de outras pragas. Moluscicidas sintéticos apresentam limitações técnicas que estimularam a busca de substitutos naturais. Dentre as várias espécies vegetais com atividade moluscicida, Euphorbia cotinifolia L., Euphorbia milii des Moul. var. splendens (Bojer ex Hook Ursch & Leandri e Euphorbia tirucalli L. despertam atenção pelos excelentes resultados obtidos sobre moluscos aquáticos. Contudo, estudos sobre a atividade de plantas moluscicidas em moluscos terrestres são pouco comuns, apesar de sua grande importância parasitológica e agrícola. As semelhanças anatomo-fisiológicas entre espécies de moluscos aquáticos e terrestres sugerem que estratégias de controle químico possam ter eficiência semelhante para os dois grupos de invertebrados. Com base nessa hipótese, o presente trabalho teve como objetivo avaliar a atividade moluscicida do látex de três espécies do gênero Euphorbia sobre Leptinaria unilamellata d'Orbigny, 1835, gastrópode terrestre descrito como hospedeiro intermediário de helmintos trematódeos digenéticos que parasitam animais domésticos. Destas E. milii var. splendens apresentou efeito moluscicida elevado sobre L. unilamellata, 100% até uma diluição de 1:800, já nos primeiros minutos após a aplicação. Embora citadas na literatura como tóxicas para moluscos aquáticos, E. cotinifolia e E. tirucalli não exibiram atividade moluscicida sobre L. unilamellata. Os resultados do presente estudo indicam que o látex de E. milii var. splendens pode se constituir em uma estratégia viável de controle químico de moluscos terrestres.Pulmonate terrestrial gastropods can be intermediate hosts for helminthes. The first records of chemically controlling these invertebrates date back to the beginning of the 20th century. The substances used were unspecific toxins which were already used for controlling other pests. Synthetic molluscicides have technical limitations that stimulated a search for natural substitutes. Among the many vegetal species that have molluscicidal activity, Euphorbia cotinifolia L., Euphorbia milii des Moul. var. splendens (Bojer ex Hook Ursch & Leandri and Euphorbia tirucalli L. call attention because of the excellent results that have been obtained when they are used on aquatic mollusks. However, studies on the activity of molluscicidal plants on terrestrial mollusks are rare, in spite of its great importance in controlling parasites and to agriculture. Anatomical and physiological similarities among species of aquatic and terrestrial mollusks suggest that chemical control strategies can be effective on both groups of invertebrates. Based on this hypothesis, we assessed the molluscicidal activity of the latex of three species of the genus Euphorbia on the terrestrial gastropod Leptinaria unilamellata d'Orbigny, 1835, described as an intermediate host of digenetic trematode helminths that parasitize domestic animals. E. milii var. splendens had the highest molluscicidal effect on L. unilamellata, being 100% lethal in concentrations up to 1:1800 in the first minutes after application. Although E. cotinifolia and E. tirucalli have been cited in the literature as toxic to