WorldWideScience
 
 
1

Histologia da glândula de albúmen de Pomacea canaliculata (Lamarck, 1822 (Mollusca, Gastropoda, Pilidae  

Directory of Open Access Journals (Sweden)

Full Text Available In this paper the authors give a histological analysis of the albumen gland of mature and immature females of Pomacea canaliculata (Lamarck, 1822. In the immaturity, tthe gland doesn't show any secretory activity, although in the maturity this activity is indicated by the presence of a homogeneous and eosinophilic material in its lumen. We could notice in the capsule gland of matures females a calcareous element is present as a granular and basophilic deposit. The albumen gland is envolved by a thin conjunctive layer that can be seen in van Gieson's coloured preparations.

Eliane de Fátima Marques de Mesquita

1990-01-01

2

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

Directory of Open Access Journals (Sweden)

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.

Eliana de Fátima Marques de Mesquita

1990-01-01

3

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

Directory of Open Access Journals (Sweden)

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.

Eliana de Fátima Marques de Mesquita

1990-01-01

4

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)

Full Text Available SciELO Mexico | Language: Spanish Abstract in spanish 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.

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

5

Natural parasitic infection of the golden apple snail, Pomacea canaliculata.  

Science.gov (United States)

Golden apple snails, Pomacea canaliculata, were collected once a month during a year to search for their natural parasites. The collections were made at two localities having different ecological environments. Of 576 collected snails from a canal, 176 individuals (30.6%) were infected by three groups of metacercariae. These parasites were amphistome, distome and echinostome metacercariae, which had prevalences of 23.5, 19.5 and 0.5%, respectively. The incidence of infection was highest (68.4% in October) when the snail population was composed of the old, juvenile and young Pomacea. Amphistome metacercariae were found most frequently and echinostome metacercariae the least frequently; both parasites were localized in the foot muscle of the snails and had a Shannon index of zero. The range of amphistomes was 1 to 115 with the mean +/- SD of 1 +/- 2 and 95% CL of 1, 2. Distome metacercariae were found primarily in the heart (range: 1-13), and also in the foot muscle (range: 1-5) and kidney (range: 1-14), with a Shannon index of 0.4. The means +/- SD (with 95% CL) were 3 +/- 4 (95% CL = 1, 5), 3 +/- 4 (95% CL = 2, 4) and 2 +/- 1 (95% CL = 1, 2) for the foot muscle, heart and kidney, respectively. The snails from a pond, another locality, had a low proportion of infected individuals. Of 605 snails, only 24 individuals (4.0%) were infected, with the prevalence of amphistomes, distomes and echinostomes being 0.8, 1.8 and 2.1%, respectively. The incidence of infection for each month was zero or less than 10%, except in May when it was 30.2%. PMID:8362292

Keawjam, R S; Poonswad, P; Upatham, E S; Banpavichit, S

1993-03-01

6

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

2006-01-01

7

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english 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; ape [...] x 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.

Silvana C., Thiengo; Carlos E., Borda; J. L. Barros, Araújo.

8

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

Directory of Open Access Journals (Sweden)

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.

Guilherme R. Gorni

2006-12-01

9

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)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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.

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

10

Sex ratio and susceptibility of the golden apple snail, Pomacea canaliculata.  

Science.gov (United States)

Golden apple snails, Pomacea canaliculata, were collected at two localities having different ecological environments. In both canal and pond, P. canaliculata males were found more than females during the dry season (summer and winter). In the canal, the male snails were highest in number (86.67%) in May. When rain started, they began decreasing and were lowest at 33.33% in August. Of 575 snails collected, 30.6% were infected by one or more of the three groups of amphistome, distome and echinostome metacercariae. There were two high peaks of infection in April and October, as 60.7% and 68.4%, respectively, during which there were more males than females. The average number of parasites per snail which was highest at 54 was found in the medium-sized males (25 out of 35 males) in October. The number of parasites per snail was significantly correlated with the collected males (p < 0.01), but such relationship was not occurred with the females. Of the females, only the large-sized individuals were infected. In the pond, the female snails were present in much greater numbers than the males during the reproductive time (June-September). The females were highest (94.23%) in August. Only 24 (4.0%) of 605 snails were infected; most of the infected snails were large. PMID:7855663

Banpavichit, S; Keawjam, R S; Upatham, E S

1994-06-01

11

Lethal and non-lethal effects of multiple indigenous predators on the invasive golden apple snail (Pomacea canaliculata)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

1. We investigated the individual and combined effects of two predators (the climbing perch, Anabas testudineus, and the wetland crab, Esanthelphusa nimoafi) indigenous to wetlands in Laos, on the behaviour and survival of the invasive South American golden apple snail (Pomacea canaliculata). The snail is considered a pest, consuming large amounts of rice and other aquatic vegetation in the region. 2. Snail avoidance reactions to released predator chemical cues were investigated in aquaria wh...

2004-01-01

12

Life History Variation in Invading Applesnails (Pomacea canaliculata) May Pose Ecological Threats to Wetlands  

Science.gov (United States)

In native habitats, channeled applesnails (Pomacea canaliculata) graze periphyton. However, casual observations from introduced populations suggest these invaders show variation in feeding ecology, predator response and life history strategies. Attempts to predict this consumer influence on ecosystem function suffer from a lack of basic data. We tested how salinity affected snail mortality. Both adults and hatchlings tolerated salinity levels up to 8 ppt. Adult feeding on lettuce increased significantly at 8 ppt compared to 0 ppt (p = 0.002), while hatchling consumption of algae did not vary (p = 0.284). To see how these consumers responded to predators from the invaded ecosystem, we tested behavioural responses to predatory cues from fish, turtles, crayfish and adult applesnails. Results indicated that fish and crayfish prompted similar predator-avoidance behaviors in hatchlings (p's 0.05) between native (ramshorn) and exotic applesnails, whereas adult fish consumed more applesnails (x2, p < 0.001). Our current efforts focus on examining if predator presence or macrophyte choice alters applesnail feeding rates. Research providing insight into the basic ecology of applesnails can foster management efforts at the ecosystem scale.

Marfurt, R. K.; Boland, B. B.; Burks, R. L.

2005-05-01

13

Backbone cyclised peptides from plants show molluscicidal activity against the rice pest Pomacea canaliculata (golden apple snail).  

Science.gov (United States)

Golden apple snails ( Pomacea canaliculata) are serious pests of rice in South East Asia. Cyclotides are backbone cyclized peptides produced by plants from Rubiaceae and Violaceae. In this study, we investigated the molluscicidal activity of cyclotides against golden apple snails. Crude cyclotide extracts from both Oldenlandia affinis and Viola odorata plants showed molluscicidal activity comparable to the synthetic molluscicide metaldehyde. Individual cyclotides from each extract demonstrated a range of molluscicidal activities. The cyclotides cycloviolacin O1, kalata B1, and kalata B2 were more toxic to golden apple snails than metaldehyde, while kalata B7 and kalata B8 did not cause significant mortality. The toxicity of the cyclotide kalata B2 on a nontarget species, the Nile tilapia ( Oreochromis niloticus), was three times lower than the common piscicide rotenone. Our findings suggest that the existing diversity of cyclotides in plants could be used to develop natural molluscicides. PMID:18557620

Plan, Manuel Rey R; Saska, Ivana; Cagauan, Arsenia G; Craik, David J

2008-07-01

14

Molluscicidal activity of cardiac glycosides from Nerium indicum against Pomacea canaliculata and its implications for the mechanisms of toxicity.  

Science.gov (United States)

Cardiac glycosides from fresh leaves of Nerium indicum were evaluated for its molluscicidal activity against Pomacea canaliculata (golden apple snail: GAS) under laboratory conditions. The results showed that LC(50) value of cardiac glycosides against GAS was time dependent and the LC(50) value at 96 h was as low as 3.71 mg/L, which was comparable with that of metaldehyde at 72 h (3.88 mg/L). These results indicate that cardiac glycosides could be an effective molluscicide against GAS. The toxicological mechanism of cardiac glucosides on GAS was also evaluated through changes of selected biochemical parameters, including cholinesterase (ChE) and esterase (EST) activities, glycogen and protein contents in hepatopancreas tissues of GAS. Exposure to sublethal concentrations of cardiac glycosides, GAS showed lower activities of EST isozyme in the later stages of the exposure period as well as drastically decreased glycogen content, although total protein content was not affected at the end of 24 and 48 h followed by a significant depletion at the end of 72 and 96 h. The initial increase followed by a decline of ChE activity was also observed during the experiment. These results suggest that cardiac glycosides seriously impair normal physiological metabolism, resulting in fatal alterations in major biochemical constituents of hepatopancreas tissues of P. canaliculata. PMID:21843803

Dai, Lingpeng; Wang, Wanxian; Dong, Xinjiao; Hu, Renyong; Nan, Xuyang

2011-09-01

15

A Record of Small-Clawed Otters (Aonyx cinereus) Foraging on an Invasive Pest Species, Golden Apple Snails (Pomacea canaliculata) in a West Sumatra Rice Field  

Digital Repository Infrastructure Vision for European Research (DRIVER)

A small-clawed otter (Aonyx cinereus) survey in West Sumatran rice fields was conducted from April to September 2010. During this survey, golden apple snail (Pomacea canaliculata) shell remains were found on a rice field bank as suspected prey remains of small-clawed otters. This suspicion was later proved by the occurrence of snail material (pieces of operculum and shell) in otter spraints. This is the first evidence of small-clawed otters foraging on this invasive pest species. Characterist...

2011-01-01

16

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 condi...

2012-01-01

17

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Argentina | Language: English Abstract in english 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.

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

18

A Record of Small-Clawed Otters (Aonyx cinereus Foraging on an Invasive Pest Species, Golden Apple Snails (Pomacea canaliculata in a West Sumatra Rice Field  

Directory of Open Access Journals (Sweden)

Full Text Available A small-clawed otter (Aonyx cinereus survey in West Sumatran rice fields was conducted from April to September 2010. During this survey, golden apple snail (Pomacea canaliculata shell remains were found on a rice field bank as suspected prey remains of small-clawed otters. This suspicion was later proved by the occurrence of snail material (pieces of operculum and shell in otter spraints. This is the first evidence of small-clawed otters foraging on this invasive pest species. Characteristics of the shell remains and spraints are described.

Jabang

2011-01-01

19

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 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)

2005-05-09

20

Relative warp and correlation analysis based on distances of the morphological shell shape patterns of Pomacea canaliculata Lamarck from Japan and the Philippines  

Directory of Open Access Journals (Sweden)

Full Text Available The Golden Apple Snail (GAS, Pomacea canaliculata Lamarck is considered one of the serious agricultural pests of rice in Asia. Itis being argued that rapid invasion of this species in many variable habitats suggests genetic variability and differentiation which could be expressedat the level of the phenotype. It is therefore the major objective of the study to explore possible phenotypic differentiation in the organismespecially in the shape of the shell using geometric morphometric (GM analysis. Specifically, this study aimed to determine conchologicalvariation in populations of GAS in the Philippines and Japan. Three aspects of the shell shape were studied, which includes the ventral/aperture,dorsal and the top/whorl portion of the shell using correlation analysis based on distances (CORIANDIS. CORIANDIS was used in order tovisualize congruence of multivariate traits among P. canaliculata populations. The results showed that P. canaliculata shell varies in shape andvariability may signify distinctive genotypes or adaptation to varying environments exhibited by Japan and the Philippines.

Carlo Stephen O. Moneva

2012-06-01

 
 
 
 
21

Molecular characteristics of the HSP70 gene and its differential expression in female and male golden apple snails (Pomacea canaliculata) under temperature stimulation.  

Science.gov (United States)

Heat-shock protein 70 (HSP70) is one of the most important heat-shock proteins that helps organisms to modulate stress response via over-expression. The HSP70 gene from Pomacea canaliculata was cloned using the RACE approach; the gene is 2,767 bp in length and contains an open reading frame of 1,932 bp, which is encoded by a polypeptide of 643 amino acids. BLAST analysis showed that the predicted amino acid sequence of the P. canaliculata HSP70 gene shared a relatively high similarity with that of other known eukaryotic species that display conserved HSP characteristics. The phylogeny demonstrated a separate clustering of the apple snail HSP70 with other constitutive members from other mollusk species. Quantitative real-time RT-PCR was used to detect the differential expression of HSP70 in both sexes of P. canaliculata at different temperature conditions. These results showed that HSP70 transcript levels decreased slightly under cold shock and increased significantly under heat-shock conditions in both sexes compared to normal temperatures (26 °C). Under cold-shock treatment, the sex effect was not significant. With heat treatment, HSP70 expression could be induced at 36 °C in both females and males, and it peaked at 42 and 39 °C in females and males, respectively. In addition, a clear time-dependent HSP70 expression pattern of the apple snail exposed to the same high temperature (36 °C) was observed at different time points. The maximal induction of HSP70 expression appeared at 12 and 48 h in males and females after heat shock, respectively. The maximal induction in females was significantly higher compared to males under heat stimulus. Taken together, these results strongly suggested that males were more susceptible to heat than females and provided useful molecular information for the ecological adaptability of P. canaliculata against extreme environmental stress. PMID:24368711

Song, Hong-Mei; Mu, Xi-Dong; Gu, Dang-En; Luo, Du; Yang, Ye-Xin; Xu, Meng; Luo, Jian-Ren; Zhang, Jia-En; Hu, Yin-Chang

2014-07-01

22

Intrahost distribution and trasmission of a new species of cyclopoid copepod endosymbiotic to a freshwater snail, Pomacea canaliculata (Caenogastropoda, Ampullariidae from Argentina  

Directory of Open Access Journals (Sweden)

Full Text Available A new species of cyclopoid copepod, Ozmana huarpium, is described as a symbiont to Pomacea canaliculata (Lamarck 1822 (Caenogastropoda, Ampullariidae. Rather large numbers (about one hundred copepods per snail were found, although there was no evidence of harm to the host. To our knowledge, O. haemophila (symbiont to P. maculata, and the currently described species, O. huarpium, are the only copepod species ever recorded as endosymbionts to freshwater invertebrates. While O. haemophila is restricted to the haemocoel of its host, O. huarpium predominate in the penis sheath, the ctenidium and the mantle cavity, figuring in these pallial organs 63-65 % of total mature forms. The sex ratio of the symbiont is skewed to the female side in these organs, specially in male hosts. The hypothesis that a special female tropism for the male host's pallial organs might ensure interindividual transmission of the symbiont was tested, with indications that the symbiont is mainly transmitted during copulation.

C. D. Gamarra-Luques

2004-08-01

23

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)

Full Text Available SciELO Brazil | Language: English Abstract in english 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.

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

2013-06-01

24

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)

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.

Shengzhang Dong

2012-04-01

25

Intrahost distribution and trasmission of a new species of cyclopoid copepod endosymbiotic to a freshwater snail, Pomacea canaliculata (Caenogastropoda, Ampullariidae) from Argentina  

Scientific Electronic Library Online (English)

Full Text Available SciELO Argentina | Language: English Abstract in english A new species of cyclopoid copepod, Ozmana huarpium, is described as a symbiont to Pomacea canaliculata (Lamarck 1822) (Caenogastropoda, Ampullariidae). Rather large numbers (about one hundred copepods per snail) were found, although there was no evidence of harm to the host. To our knowledge, O. ha [...] emophila (symbiont to P. maculata), and the currently described species, O. huarpium, are the only copepod species ever recorded as endosymbionts to freshwater invertebrates. While O. haemophila is restricted to the haemocoel of its host, O. huarpium predominate in the penis sheath, the ctenidium and the mantle cavity, figuring in these pallial organs 63-65 % of total mature forms. The sex ratio of the symbiont is skewed to the female side in these organs, specially in male hosts. The hypothesis that a special female tropism for the male host's pallial organs might ensure interindividual transmission of the symbiont was tested, with indications that the symbiont is mainly transmitted during copulation.

Gamarra-Luques, C. D.; Vega, I. A.; Koch, E.; Castro-Vazquez, A..

26

Toxicidade aguda do sulfato de cobre e do extrato aquoso de folhas secas de nim para o caramujo (Pomacea canaliculata = Acute toxicity of copper sulfate and aqueous extract of dried neem leaves on snails (Pomacea canaliculata  

Directory of Open Access Journals (Sweden)

Full Text Available Os caramujos podem se tornar um problema ambiental e econômico, podendo causar muitos prejuízos. O trabalho teve como objetivo estimar a toxicidade aguda do sulfato de cobre pentaidratado (CuSO4.5H2O e do extrato aquoso de folhas secas de nim para o P. canaliculata, em condição de laboratório. Para determinação da CL (I(50;96h, o caramujo foi exposto a seis concentrações crescentes de sulfato de cobre (0,0; 0,01; 0,03; 0,05; 0,07 e 0,1 mg L-1 e a seis concentrações crescentes de extrato aquoso de folhas secas denim (0,0; 100; 125; 150; 175 e 200 mL de extrato aquoso de folhas secas de nim L-1 de água, equivalente a 0,0; 1,18; 1,47; 1,77; 2,06; e 2,36 mg de azadiractina L-1, com três repetições e um tratamento-controle em um experimento no delineamento inteiramente casualizado(DIC. A CL (I(50;96h estimada para o caramujo foi de 0,07 mg de sulfato de cobre L-1, com limite inferior de 0,05 mg L-1 e limite superior de 0,1 mg L-1. A concentração letal 50% (CL (I50;96h estimada do extrato aquoso de folhas secas de nim (EAFSN para o caramujo foi de 142,75 mL L-1, equivalente a 1,68 mg L-1 de azadiractina, com limite inferior de 130,89 mL L-1 (1,54, mg L-1 e limite superior de 155,69 mL L-1 (1,83 mg L-1.Snails can become an environmental and economic problem, causing substantial losses. The objective of this work was to estimatethe acute toxicity of copper sulfate pentahydrate (CuSO4.5H2O and the aqueous extract of dried neem leaves on snails (P. canaliculata under laboratory conditions. In order to estimate the lethal concentration 50% (LC (I50;96h, snails were exposed to six increasing copper sulfate concentrations (0.0; 0.01; 0.03; 0.05; 0.07 and 0.1 mg L-1 and six increasing concentrations of aqueous extract of dried neem leaves 0.0; 100; 125; 150; 175 and 200 mL aqueous extract of dried neem leaves L-1 water, equivalent to (0.0; 1.18; 1.47; 1.77; 2.06; and 2.36 mg azadirachtin L-1, in triplicate and one control treatment in an entirely random delineation. Estimated LC (I(50;96h of copper sulfate was 0.02 mg copper sulfate L-1, with a0.01 mg L-1 lower limit and a 0.03 mg L-1 upper limit. Estimated lethal concentration 50% of the aqueous extract of dried neem leaves was 142.75 mL L-1, equivalent to 1.68 mg L-1 of azadirachtine, with a 130.89 mL L-1 (1.54 mg L-1 low limit and 155.69 mL L-1 (1.83 mg L-1as the upper limit.

Francine Perri Venturini

2008-04-01

27

Toxicidade aguda do sulfato de cobre e do extrato aquoso de folhas secas de nim para o caramujo (Pomacea canaliculata - DOI: 10.4025/actascibiolsci.v30i2.3615 Acute toxicity of copper sulfate and aqueous extract of dried neem leaves on snails (Pomacea canaliculata - DOI: 10.4025/actascibiolsci.v30i3.3615  

Directory of Open Access Journals (Sweden)

Full Text Available Os caramujos podem se tornar um problema ambiental e econômico, podendo causar muitos prejuízos. O trabalho teve como objetivo estimar a toxicidade aguda do sulfato de cobre pentaidratado (CuSO4.5H2O e do extrato aquoso de folhas secas de nim para o P. canaliculata, em condição de laboratório. Para determinação da CL (I(50;96h, o caramujo foi exposto a seis concentrações crescentes de sulfato de cobre (0,0; 0,01; 0,03; 0,05; 0,07 e 0,1 mg L-1 e a seis concentrações crescentes de extrato aquoso de folhas secas de nim (0,0; 100; 125; 150; 175 e 200 mL de extrato aquoso de folhas secas de nim L-1 de água, equivalente a 0,0; 1,18; 1,47; 1,77; 2,06; e 2,36 mg de azadiractina L-1, com três repetições e um tratamento-controle em um experimento no delineamento inteiramente casualizado (DIC. A CL (I(50;96h estimada para o caramujo foi de 0,07 mg de sulfato de cobre L-1, com limite inferior de 0,05 mg L-1 e limite superior de 0,1 mg L-1. A concentração letal 50% (CL (I50;96h estimada do extrato aquoso de folhas secas de nim (EAFSN para o caramujo foi de 142,75 mL L-1, equivalente a 1,68 mg L-1 de azadiractina, com limite inferior de 130,89 mL L-1 (1,54, mg L-1 e limite superior de 155,69 mL L-1 (1,83 mg L-1.Snails can become an environmental and economic problem, causing substantial losses. The objective of this work was to estimate the acute toxicity of copper sulfate pentahydrate (CuSO4.5H2O and the aqueous extract of dried neem leaves on snails (P. canaliculata under laboratory conditions. In order to estimate the lethal concentration 50% (LC (I50;96h, snails were exposed to six increasing copper sulfate concentrations (0.0; 0.01; 0.03; 0.05; 0.07 and 0.1 mg L-1 and six increasing concentrations of aqueous extract of dried neem leaves 0.0; 100; 125; 150; 175 and 200 mL aqueous extract of dried neem leaves L-1 water, equivalent to (0.0; 1.18; 1.47; 1.77; 2.06; and 2.36 mg azadirachtin L-1, in triplicate and one control treatment in an entirely random delineation. Estimated LC (I(50;96h of copper sulfate was 0.02 mg copper sulfate L-1, with a 0.01 mg L-1 lower limit and a 0.03 mg L-1 upper limit. Estimated lethal concentration 50% of the aqueous extract of dried neem leaves was 142.75 mL L-1, equivalent to 1.68 mg L-1 of azadirachtine, with a 130.89 mL L-1 (1.54 mg L-1 low limit and 155.69 mL L-1 (1.83 mg L-1 as the upper limit.

Robinson Antonio Pitelli

2008-05-01

28

??????: Zymomonas mobilis subsp. pomaceae  

Full Text Available Bacteria Sphingomonadaceae Zymomonas mobilis subsp. pomaceae Zymomonas anaerobia subsp. pomaceae (sic ) Millis 1956 (authority) NCBI 120044 Zymomonas mob ilis subsp. pomaceae (sic ) (Millis 1956) De Ley and Swings 1976 (authority)

29

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)

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

II César

2012-02-01

30

Colonização de Pomacea haustrum (Reeve, 1856) em localidade com esquistossomose mansoni: Baldim, MG (Brasil). (Prosobranchia, Pilidae) / Colonization of Pomacea haustrum (Reeve, 1856) at localility with Schistosomiasis mansoni: Baldim, MG (Brazil)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Public Health | Language: Portuguese Abstract in portuguese Na localidade de Baldim, MG, Brasil, foram introduzidos, em agosto de 1972, 5.421 exemplares de Pomacea haustrum (Prosobranchia, Pilidae) em 5 córregos e 2 valas, nos quais predominavam Biomphalaria glabrata (Say, 1818) e, secundariamente, B. straminea (Dunker, 1848). Entre 1968 e 1971, os índices d [...] e infecção da espécie B. glabrata por Schistosoma mansoni oscilaram de 2,1% a 11,9%. Em nenhum momento foram capturados B. straminea liberando cercárias daquele trematódeo. Após a introdução do pilídeo, apenas uma única vez detectou-se 2 (0,8%) B. glabrata positivas. Observou-se decréscimo populacional de planorbineos e aumento de densidade de pomácea até 20,0 e 121,6 exemplares/m² em córregos e valas, respectivamente. A estimativa da densidade de F. haustrum foi feita através do método dos "quadrats". Foram coletados, de junho de 1968 a julho de 1972, 65,2% (1.526) dos planorbíneos. Porém, após a introdução do predador-competidor, foram registrados os seguintes dados: 1976, 15% (352); em 1977, 16,1% (377) e, em 1978, apenas 3,7% (87) do total dos exemplares capturados. As pomáceas, transferidas do ambiente lenítico (Sete Lagoas, MG), adaptaram-se às coleções lóticas de Baldim e foram capazes de substituir as populações originais de B. glabrata em vários biótopos, ou tornaram-se, pelo menos, dominantes, sem danos visíveis para os novos ecossistemas. Acredita-se que em outras situações análogas, Pomacea haustrum (Reeve, 1956) - e, por extensão, P. lineata (Spix, 1827), P. canaliculata (Lamark, 1822) e outras do mesmo táxon - poderão ser utilizadas, com sucesso, no controle biológico dos hospedeiros intermediários de Schistosoma mansoni. Abstract in english In the region of Baldim, MG (Brazil) - a well-known Schistosoma mansoni endemic area where transmission control had already been unsuccessfully attempted through molluscicide, sanitary education and clinical treatment - 5,421 specimens of Pomacea haustrum (Prosobranchia, Pilidae) were introduced int [...] o 5 brooks and 2 ditches where Biomphalaria glabrata (primarily) and B. straminea (secondarily) predominated. From 1968 to 1971, the infection rate of B. glabrata by S. mansoni ranged from 2.1% to 11.9%. None of the B. straminea specimens collected, however, were seen to be liberating cercariae of this trematode. After the introduction of Pilidae, only once were two positive B. glabrata specimens (1.8%) detected. A decrease in the planorbide population was observed, as well as an increase in the pomacea density to 20.0 and 121.6 specimens per square meter in the brooks and ditches, respectively. P. haustrum density was estimated by the "quadrat" method. Of the planorbides in the experiment, 65.2% (1,526) were collected from July/68 to July/72 and the rest were obtained after the introduction of the predator-competitor species, as follows: 15.0% (352) in 1976; 16.1% (377) in 1977; and 3.7% (87) in 1978. Although transferred from a lenitic medium (Sete Lagoas, MG), the pomaceae became perfectly adapted to the lotic collections of Baldim, and proved to be capable of replacing the original B. glabrata populations of several biotopes or, at least, of becoming predominant, with no damage to the new ecosystems. Based on the data presented above and the knowledge previously acquired in the study of the biology and ecology of the species, it is believed that, under similar conditions, Pomacea haustrum (Reeve, 1856) - and, by extension, P. lineata (Spix, 1827) and P. canaliculata (Lamarck, 1822), as well as other species from the same genus - may be successfully used in the biological control of the intermediate hosts of S. mansoni.

Roberto, Milward-de-Andrade; Omar dos Santos, Carvalho.

31

Colonização de Pomacea haustrum (Reeve, 1856) em localidade com esquistossomose mansoni: Baldim, MG (Brasil). (Prosobranchia, Pilidae) / Colonization of Pomacea haustrum (Reeve, 1856) at localility with Schistosomiasis mansoni: Baldim, MG (Brazil)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese Na localidade de Baldim, MG, Brasil, foram introduzidos, em agosto de 1972, 5.421 exemplares de Pomacea haustrum (Prosobranchia, Pilidae) em 5 córregos e 2 valas, nos quais predominavam Biomphalaria glabrata (Say, 1818) e, secundariamente, B. straminea (Dunker, 1848). Entre 1968 e 1971, os índices d [...] e infecção da espécie B. glabrata por Schistosoma mansoni oscilaram de 2,1% a 11,9%. Em nenhum momento foram capturados B. straminea liberando cercárias daquele trematódeo. Após a introdução do pilídeo, apenas uma única vez detectou-se 2 (0,8%) B. glabrata positivas. Observou-se decréscimo populacional de planorbineos e aumento de densidade de pomácea até 20,0 e 121,6 exemplares/m² em córregos e valas, respectivamente. A estimativa da densidade de F. haustrum foi feita através do método dos "quadrats". Foram coletados, de junho de 1968 a julho de 1972, 65,2% (1.526) dos planorbíneos. Porém, após a introdução do predador-competidor, foram registrados os seguintes dados: 1976, 15% (352); em 1977, 16,1% (377) e, em 1978, apenas 3,7% (87) do total dos exemplares capturados. As pomáceas, transferidas do ambiente lenítico (Sete Lagoas, MG), adaptaram-se às coleções lóticas de Baldim e foram capazes de substituir as populações originais de B. glabrata em vários biótopos, ou tornaram-se, pelo menos, dominantes, sem danos visíveis para os novos ecossistemas. Acredita-se que em outras situações análogas, Pomacea haustrum (Reeve, 1956) - e, por extensão, P. lineata (Spix, 1827), P. canaliculata (Lamark, 1822) e outras do mesmo táxon - poderão ser utilizadas, com sucesso, no controle biológico dos hospedeiros intermediários de Schistosoma mansoni. Abstract in english In the region of Baldim, MG (Brazil) - a well-known Schistosoma mansoni endemic area where transmission control had already been unsuccessfully attempted through molluscicide, sanitary education and clinical treatment - 5,421 specimens of Pomacea haustrum (Prosobranchia, Pilidae) were introduced int [...] o 5 brooks and 2 ditches where Biomphalaria glabrata (primarily) and B. straminea (secondarily) predominated. From 1968 to 1971, the infection rate of B. glabrata by S. mansoni ranged from 2.1% to 11.9%. None of the B. straminea specimens collected, however, were seen to be liberating cercariae of this trematode. After the introduction of Pilidae, only once were two positive B. glabrata specimens (1.8%) detected. A decrease in the planorbide population was observed, as well as an increase in the pomacea density to 20.0 and 121.6 specimens per square meter in the brooks and ditches, respectively. P. haustrum density was estimated by the "quadrat" method. Of the planorbides in the experiment, 65.2% (1,526) were collected from July/68 to July/72 and the rest were obtained after the introduction of the predator-competitor species, as follows: 15.0% (352) in 1976; 16.1% (377) in 1977; and 3.7% (87) in 1978. Although transferred from a lenitic medium (Sete Lagoas, MG), the pomaceae became perfectly adapted to the lotic collections of Baldim, and proved to be capable of replacing the original B. glabrata populations of several biotopes or, at least, of becoming predominant, with no damage to the new ecosystems. Based on the data presented above and the knowledge previously acquired in the study of the biology and ecology of the species, it is believed that, under similar conditions, Pomacea haustrum (Reeve, 1856) - and, by extension, P. lineata (Spix, 1827) and P. canaliculata (Lamarck, 1822), as well as other species from the same genus - may be successfully used in the biological control of the intermediate hosts of S. mansoni.

Roberto, Milward-de-Andrade; Omar dos Santos, Carvalho.

32

Colonização de Pomacea haustrum (Reeve, 1856 em localidade com esquistossomose mansoni: Baldim, MG (Brasil. (Prosobranchia, Pilidae Colonization of Pomacea haustrum (Reeve, 1856 at localility with Schistosomiasis mansoni: Baldim, MG (Brazil  

Directory of Open Access Journals (Sweden)

Full Text Available Na localidade de Baldim, MG, Brasil, foram introduzidos, em agosto de 1972, 5.421 exemplares de Pomacea haustrum (Prosobranchia, Pilidae em 5 córregos e 2 valas, nos quais predominavam Biomphalaria glabrata (Say, 1818 e, secundariamente, B. straminea (Dunker, 1848. Entre 1968 e 1971, os índices de infecção da espécie B. glabrata por Schistosoma mansoni oscilaram de 2,1% a 11,9%. Em nenhum momento foram capturados B. straminea liberando cercárias daquele trematódeo. Após a introdução do pilídeo, apenas uma única vez detectou-se 2 (0,8% B. glabrata positivas. Observou-se decréscimo populacional de planorbineos e aumento de densidade de pomácea até 20,0 e 121,6 exemplares/m² em córregos e valas, respectivamente. A estimativa da densidade de F. haustrum foi feita através do método dos "quadrats". Foram coletados, de junho de 1968 a julho de 1972, 65,2% (1.526 dos planorbíneos. Porém, após a introdução do predador-competidor, foram registrados os seguintes dados: 1976, 15% (352; em 1977, 16,1% (377 e, em 1978, apenas 3,7% (87 do total dos exemplares capturados. As pomáceas, transferidas do ambiente lenítico (Sete Lagoas, MG, adaptaram-se às coleções lóticas de Baldim e foram capazes de substituir as populações originais de B. glabrata em vários biótopos, ou tornaram-se, pelo menos, dominantes, sem danos visíveis para os novos ecossistemas. Acredita-se que em outras situações análogas, Pomacea haustrum (Reeve, 1956 - e, por extensão, P. lineata (Spix, 1827, P. canaliculata (Lamark, 1822 e outras do mesmo táxon - poderão ser utilizadas, com sucesso, no controle biológico dos hospedeiros intermediários de Schistosoma mansoni.In the region of Baldim, MG (Brazil - a well-known Schistosoma mansoni endemic area where transmission control had already been unsuccessfully attempted through molluscicide, sanitary education and clinical treatment - 5,421 specimens of Pomacea haustrum (Prosobranchia, Pilidae were introduced into 5 brooks and 2 ditches where Biomphalaria glabrata (primarily and B. straminea (secondarily predominated. From 1968 to 1971, the infection rate of B. glabrata by S. mansoni ranged from 2.1% to 11.9%. None of the B. straminea specimens collected, however, were seen to be liberating cercariae of this trematode. After the introduction of Pilidae, only once were two positive B. glabrata specimens (1.8% detected. A decrease in the planorbide population was observed, as well as an increase in the pomacea density to 20.0 and 121.6 specimens per square meter in the brooks and ditches, respectively. P. haustrum density was estimated by the "quadrat" method. Of the planorbides in the experiment, 65.2% (1,526 were collected from July/68 to July/72 and the rest were obtained after the introduction of the predator-competitor species, as follows: 15.0% (352 in 1976; 16.1% (377 in 1977; and 3.7% (87 in 1978. Although transferred from a lenitic medium (Sete Lagoas, MG, the pomaceae became perfectly adapted to the lotic collections of Baldim, and proved to be capable of replacing the original B. glabrata populations of several biotopes or, at least, of becoming predominant, with no damage to the new ecosystems. Based on the data presented above and the knowledge previously acquired in the study of the biology and ecology of the species, it is believed that, under similar conditions, Pomacea haustrum (Reeve, 1856 - and, by extension, P. lineata (Spix, 1827 and P. canaliculata (Lamarck, 1822, as well as other species from the same genus - may be successfully used in the biological control of the intermediate hosts of S. mansoni.

Roberto Milward-de-Andrade

1979-06-01

33

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)

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.

Baker, R.; Candresse, T.

2012-01-01

34

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)

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.

Sunisa Putkome

2008-07-01

35

Karyotype description of Pomacea patula catemacensis (Caenogastropoda, Ampullariidae), with an assessment of the taxonomic status of Pomacea patula  

Scientific Electronic Library Online (English)

Full Text Available SciELO Argentina | Language: English Abstract in english Mitotic chromosomes of the freshwater snail Pomacea patula catemacensis (Baker 1922) were analyzed on gill tissue of specimens from the type locality (Lake Catemaco, Mexico). The diploid number of chromosomes is 2n = 26, including nine metacentric and four submetacentric pairs; therefore, the fundam [...] ental number is FN = 52. No sex chromosomes could be identified. The same chromosome number and morphology were already reported for P. flagellata, i.e., the other species of the genus living in Mexico. The basic haploid number for family Ampullariidae was reported to be n = 14 in the literature; so, its reduction to n = 13 is probably an apomorphy of the Mexican Pomacea snails. Lanistes bolteni, from Egypt, also shows n = 13, but its karyotype is much more asymmetrical, and seems to have evolved independently from P. flagellata and P. patula catemacensis. The nominotypical subspecies, P. patula patula (Reeve 1856), is a poorly known taxon, whose original locality is unknown. A taxonomical account is presented here, and a Mexican origin postulated as the most parsimonious hypothesis.

María Esther, Diupotex-Chong; Néstor J., Cazzaniga; Alejandra, Hernández-Santoyo; José Miguel, Betancourt-Rule.

36

Mercury residues in south Florida apple snails (Pomacea paludosa)  

Energy Technology Data Exchange (ETDEWEB)

Mercury concentrations in the sediments of south Florida wetlands have increased three fold in the last century. Because south Florida is home to many endemic and endangered species, it is important to understand the potential impacts of mercury in this ecosystem`s food web. Recent research by Malley et al. has shown mollusks to be sensitive indicators of methyl mercury which can reflect small differences in background methyl mercury concentrations. In this study, we attempted to determine if the apple snail (Pomacea paludosa) or its eggs are good indicators of bioavailable mercury. Then, using the apple snail as an indicator, we attempted to determine geographic differences in the concentrations of mercury in south Florida. 12 refs., 1 fig., 1 tab.

Eisemann, J.D.; Beyer, W.N.; Morton, A. [National Biological Services, Laurel, MD (United States); Bennetts, R.E. [Univ. of Florida, Gainesville, FL (United States)

1997-05-01

37

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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. ca...

Chen Rui; Tong QunBo; Zhang Yi; Lou Di; Kong QingMing; Lv Shan; Zhuo MingMing; Wen LiYong; Lu ShaoHong

2011-01-01

38

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

Directory of Open Access Journals (Sweden)

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.

J.G. Tangmouo

2005-06-01

39

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Argentina | Language: English Abstract in english 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.

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

40

Observations on the morphology of Pomacea lineata (Spix, 1827) (Mollusca, Ampullariidae) Observações sobre a morfologia de Pomacea lineata (Spix, 1827) (Mollusca, Ampullaridae)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

This paper deals with the morpholgy of Pomacea lineata (Spix, 1827) collected at its type locality. The shell is globose, moderately heavy, horn-colored with brown spiral bands; apex subelevated; 4 - 5 rounded whorls increasing in diameter rather rapidly, separated by deep suture. Aperture large and ovoid; outer lip sharp; umbilicus narrow and deep; operculum concentric, corneous. Ratios: shell width/shell length = 0.74 - 0.83 (mean 0.78); spire length/shell length = 0.10 - 0.18 (mean 0.13); ...

Silvana Carvalho Thiengo

1987-01-01

 
 
 
 
41

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

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

42

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

Science.gov (United States)

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.

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

2011-01-01

43

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

Directory of Open Access Journals (Sweden)

Full Text Available 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.

Lucie Ju?i?ková

2006-01-01

44

Genome sequence of the ethanol-producing Zymomonas mobilis subsp. pomaceae lectotype strain ATCC 29192.  

Science.gov (United States)

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 from that of Z. mobilis subsp. mobilis representatives, which justifies its distinct taxonomic positioning and proves particularly useful for comparative and functional genomic analyses. PMID:21742897

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

2011-09-01

45

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

Science.gov (United States)

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 from that of Z. mobilis subsp. mobilis representatives, which justifies its distinct taxonomic positioning and proves particularly useful for comparative and functional genomic analyses.

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

46

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

Science.gov (United States)

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.

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

2008-01-01

47

First record of epibionts peritrichids and suctorians (Protozoa, Ciliophora) on Pomacea lineata (Spix, 1827)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese O objetivo do presente estudo foi realizar um levantamento dos protozoários ciliados dos táxons Peritrichia e Suctoria, epibiontes de Pomacea lineata (Spix, 1827) (Ampullariidae). Cinqüenta moluscos foram coletados em ambientes de vala de irrigação, em Juiz de Fora, Minas Gerais. As conchas dos molu [...] scos foram raspadas com bisturi e o material extraído analisado in vivo sob o microscópio de luz. Todos os moluscos examinados apresentaram ciliados epibiontes em suas conchas. Registra-se pela primeira vez ciliados epibiontes em P. lineata. Sete gêneros de ciliados: cinco peritríquios e dois suctórios foram identificados e classificados nas subclasses Peritrichia : Carchesium Ehrenberg, 1838 (Vorticellidae), Epistylis Ehrenberg, 1830 (Epistylidae), Opercularia Stein, 1854 (Operculariidae), Vaginicola Lamarck, 1816 (Vaginicolidae) e Vorticella Lìnnaeus, 1767 (Vorticellidae); e Suctoria: Acineta Ehrenberg, 1834 (Acinetidae) e Tokophrya Bütschli, 1889 (Tokophrydae). Os resultados deste estudo demonstraram que P. lineata constitui o microambiente de uma comunidade de protozoários ciliados que exibem interações tróficas complexas. Abstract in english This study made a survey on the ciliate protozoans from Peritrichid and Suctorian taxa, epibionts of Pomacea lineata (Spix, 1827) (Ampullariidae). Fifty mollusks were collected in places of irrigation ditches and shell was scraped with a scalpel and the extracted material was analyzed in vivo by lig [...] ht microscopy. All examined mollusks presented epibiont ciliates on their shells. For the first time epibiont ciliates in P. lineata was record. Seven genera of ciliates: five peritrichids and two suctorians, were identified and classified within the subclass Peritrichia: Carchesium Ehrenberg, 1838 (Vorticellidae), Epistylis Ehrenberg, 1830 (Epistylidae), Opercularia Stein, 1854 (Operculariidae), Vaginicola Lamarck, 1816 (Vaginicolidae) and Vorticella Linnaeus, 1767 (Vorticellidae); and Suctoria: Acineta Ehrenberg,1834 (Acinetidae) and Tokophrya Bütschli,1889 (Tokophrydae). The results showed that P. lineata constitute the microenvironment of a ciliate protozoan community that presents complex trophic interactions.

Dias, Roberto Júnio Pedroso; D' Ávila, Sthefane; D' Agosto, Marta.

48

Distribución y abundancia del caracol Strombus pugilis (Gastropoda: Strombidae) en relación con el hábitat en la Guajira, Caribe Colombiano  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Rodríguez Rincón, Angélica María (2011) Distribución y abundancia del caracol Strombus pugilis (Gastropoda: Strombidae) en relación con el hábitat en la Guajira, Caribe Colombiano. Maestría thesis, Universidad Nacional de Colombia.

2011-01-01

49

Acción patogénica de Heterorhabditis bacteriophora (Poinar sobre el caracol manzana (Pomacea canaliculata Lamarck, plaga de los cultivos de arroz (Oriza sativa en la cuenca baja del río Daule, Guayas, Ecuador  

Directory of Open Access Journals (Sweden)

Full Text Available Los cultivos de arroz en la cuenca baja del río Daule, Ecuador, son afectados por el caracol manzana. La pérdida estimada es de 40 al 60% de la producción/ha. El agricultor, para evitar pérdidas considerables, aplica agroquímicos en dosis elevadas, desequilibrando la fauna y microfauna nativa, agravando el problema. Razón por la cual, se evaluó la patogenicidad de H. bacteriophora sobre el caracol manzana, con tres dosis; mediante un diseño completamente al azar (DCA con cuatro tratamientos y cinco repeticiones. Los resultados muestran el 100% de mortalidad por septicemia a las 96 horas de la inoculación, con relación al testigo.

G. A. Salcedo

2013-01-01

50

Laboratory spawning of the purple snail Plicopurpura pansa (Gastropoda: Muricidae  

Directory of Open Access Journals (Sweden)

Full Text Available The spawning of the muricid gastropod Plicopurpura pansa in the laboratory at 22-23°C is described. Females deposited 1-20 capsules daily for at least 20 weeks, and produced up to 150 capsules each per spawning season. During spawning, egg clusters were formed consisting of hundreds of capsules of different ages deposited by different females. Each egg capsule contained an average of 436 embryos (± s.d. 213.6, range: 95- 1 092, n = 50. Embryos developed without nurse eggs. After six to eight weeks of intracapsular, lecithotrophic development, planktotrophic veligers hatched with two fully developed velar lobesSe describe el desove del gasterópodo Plicopurpura pansa (Gould, 1853 (Gastropoda, Prosobranchia, Muricidae a 22-23°C en el laboratorio. Cada hembra depositó diariamente de 1 a 20 cápsulas por lo menos durante 20 semanas y produjo hasta 150 cápsulas durante la estación de reproducción. Durante el tiempo de desove se formaron agrupaciones de cientos de cápsulas de diferentes edades y diferentes hembras. Cada cápsula contenía, según del tamaño, en promedio 436 embriones (± s.d. 213.6, ámbito: 95-1 092, n=50. Los embriones se desarrollaron sin huevos nutricios. Después de seis a ocho semanas del desarrollo lecitotrófico intracapsular eclosionaron larvas veliger planctotróficas completamente desarrolladas con dos velum de forma lobulada

Ludwig C. A. Naegel

2004-03-01

51

Laboratory spawning of the purple snail Plicopurpura pansa (Gastropoda: Muricidae)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Costa Rica | Language: English Abstract in spanish Se describe el desove del gasterópodo Plicopurpura pansa (Gould, 1853) (Gastropoda, Prosobranchia, Muricidae) a 22-23°C en el laboratorio. Cada hembra depositó diariamente de 1 a 20 cápsulas por lo menos durante 20 semanas y produjo hasta 150 cápsulas durante la estación de reproducción. Durante el [...] tiempo de desove se formaron agrupaciones de cientos de cápsulas de diferentes edades y diferentes hembras. Cada cápsula contenía, según del tamaño, en promedio 436 embriones (± s.d. 213.6, ámbito: 95-1 092, n=50). Los embriones se desarrollaron sin huevos nutricios. Después de seis a ocho semanas del desarrollo lecitotrófico intracapsular eclosionaron larvas veliger planctotróficas completamente desarrolladas con dos velum de forma lobulada Abstract in english The spawning of the muricid gastropod Plicopurpura pansa in the laboratory at 22-23°C is described. Females deposited 1-20 capsules daily for at least 20 weeks, and produced up to 150 capsules each per spawning season. During spawning, egg clusters were formed consisting of hundreds of capsules of d [...] ifferent ages deposited by different females. Each egg capsule contained an average of 436 embryos (± s.d. 213.6, range: 95- 1 092, n = 50). Embryos developed without nurse eggs. After six to eight weeks of intracapsular, lecithotrophic development, planktotrophic veligers hatched with two fully developed velar lobes

A. Naegel, Ludwig C..

52

Observations on the morphology of Pomacea lineata (Spix, 1827) (Mollusca, Ampullariidae) / Observações sobre a morfologia de Pomacea lineata (Spix, 1827) (Mollusca, Ampullaridae)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese Neste trabalho e estudada a morfologia de Pomacea lineata (Spix, 1827) baseada em material coletado na localidade-tipo. Concha com espessura moderada, globosa, castanha, com faixas espirais castanhas-escuras; ápice pouco elevado, 4-5 giros arredondados crescendo rapidamente em diâmetro, separados po [...] r suturas profundas. Abertura grande oval; lábio externo simples; umbigo pequeno e profundo; opérculo concêntrico, córneo. Razão: largura da concha/comprimento da concha = 0.74 - 0.83 (média 0.78); comprimento da espira/comprimento da concha = 0.10 - 0.18 (média 0.13); comprimento da abertura/comprimento da concha = 0.70 - 0.77 (média 0.73). Animal com sifão bem desenvolvido. A rádula é tenioglossa (2.1.1.1.2) e tem em média 35 fileiras transversais de dentes. A forma e a disposição dos dentes radulares são semelhantes ao padrão dos ampularídeos. Rim de cor castanha apresentando uma invaginação acentuada na parede direita. Ureter alongado e transversal ao eixo principal do rim. Testículo constituído por uma massa cor creme, ocupando as três primeiras voltas da espira. Espermiduto estreito e uniforme, correndo para a base da espira. Vesícula seminal esbranquiçada levemente achatada dorso-ventralmente. Próstata cilíndrica e compacta com coloração semelhante à do testículo. Pênis em forma de chicote com canal espermático fechado e de contorno circular. Bolsa do pênis ovalada, envolvendo-o completamente. Bainha do pênis alongada tendo sua largura diminuída gradualmente da base para a extremidade; sua superfície interna apresenta um canal mediano em sua metade proximal e duas glândulas, uma mediana e outra apical. Ovário constituído por túbulos ramificados branco-amarelados situados superficilamente sobre a glândula digestiva. Oviduto estreito correndo pelo eixo columelar até a base da espira. Receptáculo seminal tubular com parede espessa e extremidade proximal alargada. Glândula de albume volumosa e rosada envolvendo o receptáculo seminal e a glândula da casca em espiral. Vestígio do aparelho copulador masculino (pênis e sua bainha) presente em todas as fêmeas examinadas. Abstract in english This paper deals with the morpholgy of Pomacea lineata (Spix, 1827) collected at its type locality. The shell is globose, moderately heavy, horn-colored with brown spiral bands; apex subelevated; 4 - 5 rounded whorls increasing in diameter rather rapidly, separated by deep suture. Aperture large and [...] ovoid; outer lip sharp; umbilicus narrow and deep; operculum concentric, corneous. Ratios: shell width/shell length = 0.74 - 0.83 (mean 0.78); spire length/shell length = 0.10 - 0.18 (mean 0.13); aperture length/shell length = 0.70 - 0.77 (mean 0.73). The animal is longisiphonate. Renal organ brownish with marked invagination at its right edge. Ureter elongated with its long axis transverse to the main axis of the kidney. The radula is taenioglossate (2.1.1.1.2) and has on average 35 transverse rows of teeth. The form and arrangement of the radula teeth are nearly the same as in other Ampullariidae. The testis is cream-colored and lies in the first three whorls of the spire. Spermiduct uniformly narrow, running to the base of the spire. Seminal vesicle whitish, slightly pressed dorsoventrally. Prostate cylindric and thick, similar in color to the testis. Penis whiplike, with a closed circular spermiduct. Penis pouch ovoid completely envelping the penis. Penis sheath elongated, broad prosimally, tapering distally. Its inner surface shows a longitudinal channel along its proximal half and two glands, one on the middle and the other apical. Ovary composed of branched whitish tubules situated on the surface of the digestive gland. Oviduct slender running along the columellar axis toward the base of the spire. Seminal receptalble tubiform, thick-walled and rounded proximally. Albumen gland large, pink, enclosing the receptacle and the spiral capsule gland. Vestigial male copulatory apparatus (penis and its sheath)

Silvana Carvalho, Thiengo.

53

Homology and homoplasy of swimming behaviors and neural circuits in the Nudipleura (Mollusca, Gastropoda, Opisthobranchia)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

How neural circuit evolution relates to behavioral evolution is not well understood. Here the relationship between neural circuits and behavior is explored with respect to the swimming behaviors of the Nudipleura (Mollusca, Gastropoda, Opithobranchia). Nudipleura is a diverse monophyletic clade of sea slugs among which only a small percentage of species can swim. Swimming falls into a limited number of categories, the most prevalent of which are rhythmic left–right body flexions (LR) and rh...

Newcomb, James M.; Sakurai, Akira; Lillvis, Joshua L.; Gunaratne, Charuni A.; Katz, Paul S.

2012-01-01

54

From sea to land and beyond : new insights into the evolution of euthyneuran Gastropoda (Mollusca)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Background The Euthyneura are considered to be the most successful and diverse group of Gastropoda. Phylogenetically, they are riven with controversy. Previous morphology-based phylogenetic studies have been greatly hampered by rampant parallelism in morphological characters or by incomplete taxon sampling. Based on sequences of nuclear 18S rRNA and 28S rRNA as well as mitochondrial 16S rRNA and COI DNA from 56 taxa, we reconstructed the phylogeny of Euthyneura utilising Maximum Likelihood an...

Klussmann-kolb, Annette; Dinapoli, Angela; Kuhn, Kerstin; Streit, Bruno; Albrecht, Christian

2008-01-01

55

Use of axonal projection patterns for the homologisation of cerebral nerves in Opisthobranchia, Mollusca and Gastropoda  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Introduction: Gastropoda are guided by several sensory organs in the head region, referred to as cephalic sensory organs (CSOs). These CSOs are innervated by distinct nerves. This study proposes a unified terminology for the cerebral nerves and the categories of CSOs and then investigates the neuroanatomy and cellular innervation patterns of these cerebral nerves, in order to homologise them. The homologisation of the cerebral nerves in conjunction with other data, e.g. ontogenetic developmen...

Klussmann-kolb, Annette; Croll, Roger P.; Staubach, Sid

2013-01-01

56

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 ...

Fernández-Marín Beatriz; Míguez Fátima; Becerril José; García-Plazaola José

2011-01-01

57

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  

Directory of Open Access Journals (Sweden)

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.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.

Norma Angélica Santibañez Aguascalientes

2013-03-01

58

Exotic molluscs (Mollusca, Gastropoda et Bivalvia in Santa Catarina State, Southern Brazil region: check list and regional spatial distribution  

Directory of Open Access Journals (Sweden)

Full Text Available A total of twenty-one exotic mollusc taxa were assessed for Santa Catarina State (SC, fifteen Gastropoda andsix Bivalvia (twelve terrestrial, five limnic/freshwater - three gastropods and two bivalves, and four marinebivalves. Of these, fourteen are confirmed as invasive species (nine terrestrial, three limnic/freshwater, andtwo marine.

A. Ignacio Agudo-Padrón

2011-06-01

59

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)

Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish 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

DANIELA, VERGARA; LUZ ELENA, VELÁSQUEZ.

2009-04-30

60

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)

Full Text Available SciELO Brazil | Language: English Abstract in spanish 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.

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

 
 
 
 
61

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  

Directory of Open Access Journals (Sweden)

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.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.

Hilzeth L.F. Pessôa

2007-03-01

62

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)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese 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.

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.

63

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

Directory of Open Access Journals (Sweden)

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.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 intraspecific 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.

Rina Ramírez

2011-08-01

64

The oldest evidence of non-coaxial shell heterostrophy in the Class Gastropoda  

Directory of Open Access Journals (Sweden)

Full Text Available The term shell heterostrophy describes the condition where the shell whorls coil in one direction during one portion of a gastropod’s life, and in the other direction for another portion. In the present paper, the oldest evidence of non-coaxial shell heterostrophy in the Class Gastropoda is documented in the new species Koneprusellia zaki sp. nov. (Porcellioidea, Archaeogastropoda, coming from the Early Devonian of the Barrandian area (Bohemia. A brief analysis of the occurrences of this shell’s morphological features, among the Paleozoic gastropods, revealed that the shell heterostrophy was present in at least three unrelated gastropod lineages: in the clades Heterobranchia (Devonian-Recent, Macluritoidea (Ordovician, and Porcellioidea (Silurian–Cretaceous

Ferrová L

2011-11-01

65

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

DEFF Research Database (Denmark)

Following a request by the European Commission, EFSAâ??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 â??canaliculata complexâ??, 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 â??canaliculata complexâ??, 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.

Baker, R.; Candresse, T.

2012-01-01

66

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)

Full Text Available SciELO Peru | Language: Spanish Abstract in spanish 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.

Pedro, Romero; Rina, Ramírez.

67

El género Lithotrochus Conrad (Gastropoda, Vetigastropoda) en el Jurásico temprano de Argentina / The Genus Lithotrochus Conrad (Gastropoda, Vetigastropoda) In The Early Jurassic Of Argentina  

Scientific Electronic Library Online (English)

Full Text Available SciELO Argentina | Language: Spanish Abstract in spanish El género Lithotrochus (Gastropoda, Trochidae) se distribuye en la cordillera de los Andes desde Perú hasta la Patagonia argentina, es endémico en la región y posee una corta distribución en el tiempo (Sinemuriano-Pliensbachiano). Lithotrochus humboldtii (von Buch) es una de las primeras especies de [...] gastrópodos mesozoicos descriptas para América del Sur. Casi todas las descripciones y figuras conocidas de la literatura de material asignable a Lithotrochus parecen pertenecer a esta única especie, aunque existen para ella al menos dos nombres disponibles que fueron creados por von Buch y d'Orbigny en el siglo XIX. Sin embargo, en el sur de la Cuenca Neuquina se ha reconocido una nueva especie asignable al género Lithotrochus (Lithotrochus rothi n. sp.), lo que ha obligado a enmendar su diagnosis. A pesar de que se encuentra en numerosas localidades, la distribución del género está restringida a depósitos de ambientes sublitorales, y se asocia a variadas faunas bentónicas en la cercanía de depósitos con corales coloniales. Un análisis detallado de la morfología de la conchilla de la especie tipo, prestando especial atención a la ontogenia, demuestra que hay un cambio de la tasa de traslación a lo largo del eje de enroscamiento con el crecimiento, y esto podría implicar una modificación de los hábitos de vida del organismo con el tiempo. Estos organismos eran probablemente herbívoros y habitaban sustratos firmes en aguas bien iluminadas y oxigenadas. Se ha podido observar que el labio columelar es liso, lo que indica posibles afinidades con la familia Trochidae s.l., aunque lamentablemente no se han hallado aún protoconchas ni opérculos que puedan ayudar a una discusión más fundamentada de sus relaciones. Abstract in english The genus Lithotrochus (Gastropoda, Trochidae) is known in the Andean region from northern Peru to Argentine Patagonia, is endemic to this area and has a short time range (Sinemurian- Pliensbachian). Lithotrochus humboldtii (von Buch) is one of the first Mesozoic gastropod species described for Sout [...] h America. Almost all previous descriptions and figures seem to belong to the type species, for which there are at least two available names proposed by von Buch and d'Orbigny during the 19th century. A new species has been recognized from southern Neuquén Basin and is described here (Lithotrochus rothi n. sp.). The generic diagnosis is emended accordingly. Although the genus was found in several localities, its distribution is limited to sublittoral deposits, associated to a varied benthonic fauna, in the vicinity of coralliferous facies. A detailed analysis of the shell morphology of the type species and its ontogeny shows that there is a change in the traslation rate along the coiling axis as the shell grows, which could be related to a change in the organism life habits with time. These were probably grazing herbivores inhabiting firm substrates in well-lit and oxygenated waters. The presence of a smooth columellar lip points to links with the Trochidae s.l., but unfortunately their relationships are difficult to establish, since no protoconchs or opercula were found so far.

Susana E., Damborenea; S. Mariel, Ferrari.

2008-03-30

68

In vivo efficacy of praziquantel against Echinoparyphium aconiatum (Trematoda: Echinostomatidae) parasitizing the great pond snails Lymnaea stagnalis (Gastropoda: Lymnaeidae).  

Science.gov (United States)

The present study had a practical goal. I aimed to determine whether praziquantel could reduce the production of Echinoparyphium aconiatum (Trematoda: Echinostomatidae) cercariae in infected snails Lymnaea stagnalis (Gastropoda: Lymnaeidae) without killing the hosts. Praziquantel is a broad-spectrum antihelminth agent. It caused a total cessation of cercaria shedding when the praziquantel concentration in the treatment bath was 10 mg/L and the treatment time was 30 h or longer. A next research step which has to be taken before giving detailed recommendations about using praziquantel for ceasing production of E. aconiatum cercariae in parasitized snails is to follow the survivorship and performance of treated snails after a praziquantel exposure for longer than in this medium-term (3 days) experiment. PMID:21756908

Voutilainen, Ari

2011-09-01

69

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

Directory of Open Access Journals (Sweden)

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.

Roberto Zamora-Bustillos

2011-09-01

70

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish 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 d [...] el 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. Abstract in english 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 genet [...] ic 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.

Roberto, Zamora-Bustillos; Rossanna, Rodríguez-Canul; Francisco J, García de León; Jorge, Tello Cetina.

71

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish 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

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

72

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  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

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

2005-01-01

73

A new dimeric iridal triterpenoid from Belamcanda chinensis with significant molluscicide activity.  

Science.gov (United States)

An unprecedented dimeric triterpenoid, designated dibelamcandal A, with a six-membered ring linking two iridal type triterpenoid nuclei, was isolated from the rhizome of Belamcanda chinensis. Its structure was determined by extensive spectroscopic measurements, including IR, ESI-MS, HR-ESI-MS, and 1D and 2D NMR. It demonstrated significant molluscicide activity against Pomacea canaliculata. PMID:21174449

Song, Zhi-Jun; Xu, Xue-Min; Deng, Wen-Long; Peng, Shu-Lin; Ding, Li-Sheng; Xu, Han-Hong

2011-02-01

74

Populational status of the endangered mollusc Patella ferruginea Gmelin, 1791 (Gastropoda, Patellidae on Algerian islands (SW Mediterranean  

Directory of Open Access Journals (Sweden)

Full Text Available Populational status of the endangered mollusc Patella ferruginea Gmelin, 1791 (Gastropoda, Patellidae on Algerian islands (SW MediterraneanPatella ferruginea is the most endangered endemic marine inverte¬brate on the Western Mediterranean coasts according to the European Council Directive 92/43/EEC. A total of 1,017 individuals were recorded in the present study along western Algerian islands, with mean densities ranging from 0.8 to 35.3 ind/m per linear transect and averages of 4.8 ind/m per linear transect for Western Habibas Island and 22 ind/m for Plane Island, making these islands a hot spot for the species in the Medi¬terranean. The expected total number of specimens in Habibas would therefore be 50,400. The mean size of P. ferruginea on the Habibas Islands (4.45 cm was significantly (p < 0.001 greater than on Plane Island (2.78 cm. Recruitment was high in Plane Island and the northern sector of the western Habibas Islands. Lar¬ge adults had very conical shells. The fact that Habibas Islands is now a marine reserve could explain these differences in populations. Conservation of these populations should be a priority in order to avoid extinction of the species.

F. Espinosa

2009-01-01

75

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)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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.

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

76

Nyctemeral variations of magnesium intake in the calcitic layer of a Chilean mollusk shell ( Concholepas concholepas, Gastropoda)  

Science.gov (United States)

Mollusk shells are increasingly used as records of past environmental conditions, particularly for sea-surface temperature (SST) reconstructions. Many recent studies tackled SST (and/or sea-surface salinity) tracers through variations in the elementary (Mg and Sr) or stable isotope (? 18O) composition within mollusk shells. But such attempts, which sometimes include calibration studies on modern specimens, are not always conclusive. We present here a series of Mg and Sr analyses in the calcitic layer of Concholepas concholepas (Muricidae, Gastropoda) with a very high time-resolution on a time window covering about 1 and a half month of shell formation, performed by Laser Ablation Inductively-Coupled Plasma Mass Spectrometry (LA-ICP-MS) and electron probe micro-analysis (EPMA). The selected specimen of this common Chilean gastropod was grown under controlled environmental conditions and precise weekly time-marks were imprinted in the shell with calcein staining. Strontium variations in the shell are too limited to be interpreted in terms of environmental parameter changes. In contrast, Mg incorporation into the shell and growth rate appear to change systematically between night and day. During the day, Mg is incorporated at a higher rate than at night and this intake seems positively correlated with water temperature. The nightly reduced Mg incorporation is seemingly related to metabolically controlled processes, formation of organic-rich shell increments and nocturnal feeding activity of the animals. The nyctemeral Mg changes in the C. concholepas shell revealed in this study might explain at least part of the discrepancies observed in previous studies on the use of Mg as a SST proxy in mollusk shells. In the case of C. concholepas, Mg cannot be used straightforwardly as a SST proxy.

Lazareth, Claire E.; Guzman, Nury; Poitrasson, Franck; Candaudap, Frederic; Ortlieb, Luc

2007-11-01

77

Variación espacio-temporal de Scleractinia, Gorgonacea, Gastropoda, Bivalvia, Cephalopoda, Asteroidea, Echinoidea y Holothuroidea, de fondos someros de la isla San José, Golfo de California  

Directory of Open Access Journals (Sweden)

Full Text Available Se realizaron seis expediciones a la isla San José, Golfo de California entre los años 1999 y 2000 en donde se llevaron a cabo las observaciones y muestreos. Con base en los muestreos se determinó el componente específico de tres filos de macroinvertebrados bentónicos en nueve localidades: Cnidaria (Scleractinia y Gorgonacea, Mollusca (Gastropoda, Bivalvia y Cephalopoda, y Echinodermata (Echinoidea, Asteroidea y Holothuroidea. La abundancia del macrobentos conspicuo se estimó visualmente mediante buceo libre a una profundidad entre 2 y 6 m a lo largo de dos transectos en banda paralelos a la línea de costa. Se determinó un total de 38 táxones de los tres grupos. Las especies más abundantes son Tripneustes depressus (44,9%, Echinometra vanbruntii (18,3, Phataria unifascialis (8,9%, Centrostephanus coronatus (8,0%, Diadema mexicanum (5% y Eucidaris thouarsii (3,6%. No se encontraron diferencias significativas en la diversidad (H’, equidad (J y riqueza de especies (S entre los meses y localidades. El análisis de similitud identificó a dos grupos de las localidades del litoral oriental y occidental.Space-time variation of Scleractinia, Gorgonacea, Gastropoda, Bivalvia, Cephalopoda, Asteroidea, Echinoidea and Holothuroidea, from shallow bottom in San Jose Island, Gulf of California. Between the years 1999 and 2000, six expeditions were made to Isla San José, in the Gulf of California. Observations and samples were taken of benthic macroinvertebrates in nine locations. Based on the samples, the specific components of three phyla were determined: Cnidaria (Scleractinia and Gorgonacea, Mollusca (Gastropoda, Bivalvia and Cephalopoda, and Echinodermata (Echinoidea and Holothuroidea. The abundance of conspicuous benthic macroinvertebrates was visually estimated through free dives at a depth of between two and six meters along two transects parallel to the coast. A total of 38 taxa in three groups were determined. The most abundant species are Tripneustes depressus (44,9%,Echinometra vanbruntii (18,3%,Phataria unifascialis (8,9%, Centrostephanus coronatus (8,0%, Diadema mexicanum (5% y Eucidaris thouarsii (3,6%. No significant differences between diversity (H’, equity (J and richness of the species (S during the months and site of study. The similarity analysis identified two groups from locations of the eastern and western coasts. Rev. Biol. Trop. 56 (3: 1189-1199. Epub 2008 September 30.

Oscar Efraín Holguin Quiñones

2008-09-01

78

Variación espacio-temporal de Scleractinia, Gorgonacea, Gastropoda, Bivalvia, Cephalopoda, Asteroidea, Echinoidea y Holothuroidea, de fondos someros de la isla San José, Golfo de California  

Scientific Electronic Library Online (English)

Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish Se realizaron seis expediciones a la isla San José, Golfo de California entre los años 1999 y 2000 en donde se llevaron a cabo las observaciones y muestreos. Con base en los muestreos se determinó el componente específico de tres filos de macroinvertebrados bentónicos en nueve localidades: Cnidaria [...] (Scleractinia y Gorgonacea), Mollusca (Gastropoda, Bivalvia y Cephalopoda), y Echinodermata (Echinoidea, Asteroidea y Holothuroidea). La abundancia del macrobentos conspicuo se estimó visualmente mediante buceo libre a una profundidad entre 2 y 6 m a lo largo de dos transectos en banda paralelos a la línea de costa. Se determinó un total de 38 táxones de los tres grupos. Las especies más abundantes son Tripneustes depressus (44,9%), Echinometra vanbruntii (18,3), Phataria unifascialis (8,9%), Centrostephanus coronatus (8,0%), Diadema mexicanum (5%) y Eucidaris thouarsii (3,6%). No se encontraron diferencias significativas en la diversidad (H’), equidad (J) y riqueza de especies (S) entre los meses y localidades. El análisis de similitud identificó a dos grupos de las localidades del litoral oriental y occidental. Abstract in english Space-time variation of Scleractinia, Gorgonacea, Gastropoda, Bivalvia, Cephalopoda, Asteroidea, Echinoidea and Holothuroidea, from shallow bottom in San Jose Island, Gulf of California. Between the years 1999 and 2000, six expeditions were made to Isla San José, in the Gulf of California. Observati [...] ons and samples were taken of benthic macroinvertebrates in nine locations. Based on the samples, the specific components of three phyla were determined: Cnidaria (Scleractinia and Gorgonacea), Mollusca (Gastropoda, Bivalvia and Cephalopoda), and Echinodermata (Echinoidea and Holothuroidea). The abundance of conspicuous benthic macroinvertebrates was visually estimated through free dives at a depth of between two and six meters along two transects parallel to the coast. A total of 38 taxa in three groups were determined. The most abundant species are Tripneustes depressus (44,9%),Echinometra vanbruntii (18,3%),Phataria unifascialis (8,9%), Centrostephanus coronatus (8,0%), Diadema mexicanum (5%) y Eucidaris thouarsii (3,6%). No significant differences between diversity (H’), equity (J) and richness of the species (S) during the months and site of study. The similarity analysis identified two groups from locations of the eastern and western coasts. Rev. Biol. Trop. 56 (3): 1189-1199. Epub 2008 September 30.

Oscar Efraín, Holguin Quiñones; Felipe de Jesús, González Medina; Francisco, Solís Marín; Esteban F, Félix Pico.

79

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)

Full Text Available SciELO Argentina | Language: Spanish Abstract in spanish 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.

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

80

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)

Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish 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.

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

 
 
 
 
81

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

Directory of Open Access Journals (Sweden)

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

Kenné de Kock

2009-09-01

82

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)

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.

Oscar RAVERA

2005-08-01

83

[Space-time variation of Scleractinia, Gorgonacea, Gastropoda, Bivalvia, Cephalopoda, Asteroidea, Echinoidea and Holothuroidea, from shallow bottom in San Jose Island, Gulf of California].  

Science.gov (United States)

Between the years 1999 and 2000, six expeditions were made to Isla San José, in the Gulf of California. Observations and samples were taken of benthic macroinvertebrates in nine locations. Based on the samples, the specific components of three phyla were determined: Cnidaria (Scleractinia and Gorgonacea), Mollusca (Gastropoda, Bivalvia and Cephalopoda), and Echinodermata (Echinoidea and Holothuroidea). The abundance of conspicuous benthic macroinvertebrates was visually estimated through free dives at a depth of between two and six meters along two transects parallel to the coast. A total of 38 taxa in three groups were determined. The most abundant species are Tripneustes depressus (44.9%), Echinometra vanbruntii (18.3%), Phataria unifascialis (8.9%), Centrostephanus coronatus (8.0%), Diadema mexicanum (5%) y Eucidaris thouarsii (3.6%). No significant differences between diversity (H'), equity (J) and richness of the species (S) during the months and site of study. The similarity analysis identified two groups from locations of the eastern and western coasts. PMID:19419038

Holguin Quiñones, Oscar Efraín; González Medina, Felipe de Jesús; Solís Marín, Francisco; Félix Pico, Esteban F

2008-09-01

84

Invading herbivory: The golden apple snail alters ecosystem functioning in Asian wetlands  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We investigated the effects of an exotic snail, the golden apple snail (Pomacea canaliculata) on biodiversity and ecosystem functioning in tropical wetland ecosystems. This large snail (up to 80-mm shell height) has invaded large parts of Southeast Asia during recent decades. A survey of natural wetlands in Thailand showed that high densities of the snail were associated with almost complete absence of aquatic plants, high nutrient concentrations, and high phytoplankton biomass, that is, a co...

Carlsson, Nils; Brönmark, Christer; Hansson, Lars-anders

2004-01-01

85

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)

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

CARLOS MOLINET

2005-09-01

86

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)

Full Text Available SciELO Chile | Language: English Abstract in spanish 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

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

87

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

Directory of Open Access Journals (Sweden)

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.

EFSA Panel on Plant Health (PLH

2013-12-01

88

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english 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.

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

89

Bulimulidae (Gastropoda, Stylommatophora do nordeste do Brasil  

Directory of Open Access Journals (Sweden)

Full Text Available Results from studies with Bulimulidae from Northeast Brazil, with special reference to the State of Pernambuco, are presented. About 14 spp., of Bulimulidae s.s. were collected and represent one of the most diversified families of land snails in this area. From these, Drymaeus rufolineatus (Droüet, 1859 and Simpulopsis corrugata, Guppy, 1866, were recorded for the first time in Northeast Brazil and a new subspecies Drymaeus b. goianensis is described. Data of geografic distribution, ecology and shell morphology for each species are given.

A.V.C. Dutra-Clarke

1990-01-01

90

Bulimulidae (Gastropoda, Stylommatophora) do nordeste do Brasil  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] Abstract in english Results from studies with Bulimulidae from Northeast Brazil, with special reference to the State of Pernambuco, are presented. About 14 spp., of Bulimulidae s.s. were collected and represent one of the most diversified families of land snails in this area. From these, Drymaeus rufolineatus (Droüet, [...] 1859) and Simpulopsis corrugata, Guppy, 1866, were recorded for the first time in Northeast Brazil and a new subspecies Drymaeus b. goianensis is described. Data of geografic distribution, ecology and shell morphology for each species are given.

A.V.C., Dutra-Clarke; F.B.V.A. de, Souza.

91

Variações anatômicas em Lymnaea columella (Mollusca, Gastropoda  

Directory of Open Access Journals (Sweden)

Full Text Available Foram estudadas variações anatômicas de espécimes de L. columella coletados de diferentes criadouros situados em diversos Municípios do Estado de São Paulo: Campinas, Americana, Atibaia, Pirassununga, Caçapava e Taubaté. As comparações morfométricas foram baseadas em estudos do aparelho genital, rim e rádula. Foram medidos, para cada criadouro, os comprimentos do conjunto útero-vagina, dueto da espermateca, prepúcio e bainha do pênis. Foram ainda calculados os índices de relação entre bainha do pênis/prepúcio e estabelecidos os coeficientes de correlação entre comprimento da concha e comprimento do prepúcio. Cortes longitudiais do complexo peniano foram também objeto de estudo. Em relação a rádula foram determinados o número de fileiras transversais e o número de dentes por fileira, e estabelecida uma fórmula radular aproximada para os diversos criadouros.Soft parts of Lymnaea columella from ten populations from the State of São Paulo were studied in order to determine morphometric variations. These morphometric cornparisons were made upon reproductive system, kidney and radula of snail samples collected in different municipalities: Campinas, Americana, Atibaia, Pirassununga, Caçapava and Taubaté. Length measurementes of uterus, duct of spermatheca, prepuce and penis sheath were taken; the ratio penis sheath/prepuce and correlation coefficients between length of shell and length of prepuce were established. Longitudinal sections of penial complex were also studied. The number of trans verse rows, number of teeth per rows and the length of shell were determined. For each sample, the radular formula was indicated.

Marlene T. Ueta

1977-12-01

92

Notes on Buccinulum (Gastropoda, Buccinidae), a reappraisal  

Digital Repository Infrastructure Vision for European Research (DRIVER)

An attempt was made to assemble what is known at present of Buccinulum in the Indo-Western Pacific Region, fossil and Recent, more scope being offered by the discovery of new Miocene fossils from Java and Sumatra, and the recognition of further fossil species from India and Burma. This induced comparisons with, and revisions of some of the fossil and living species occurring in adjacent zoogeographical provinces. The Recent distribution of the subgenus Euthria appears to be much more extensiv...

1986-01-01

93

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

Directory of Open Access Journals (Sweden)

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.

Jakkaphun Nanuam

2013-07-01

94

Impact of invasive apple snails on the functioning and services of natural and managed wetlands  

Science.gov (United States)

At least 14 species of apple snail (Ampullariidae) have been released to water bodies outside their native ranges; however, less than half of these species have become widespread or caused appreciable impacts. We review evidence for the impact of apple snails on natural and managed wetlands focusing on those studies that have elucidated impact mechanisms. Significant changes in wetland ecosystems have been noted in regions where the snails are established: Two species in particular (Pomacea canaliculata and Pomacea maculata) have become major pests of aquatic crops, including rice, and caused enormous increases in molluscicide use. Invasive apple snails have also altered macrophyte community structure in natural and managed wetlands through selective herbivory and certain apple snail species can potentially shift the balance of freshwater ecosystems from clear water (macrophyte dominated) to turbid (plankton dominated) states by depleting densities of native aquatic plants. Furthermore, the introductions of some apple snail species have altered benthic community structure either directly, through predation, or indirectly, through exploitation competition or as a result of management actions. To date much of the evidence for these impacts has been based on correlations, with few manipulative field or mesocosm experiments. Greater attention to impact monitoring is required, and, for Asia in particular, a landscape approach to impact management that includes both natural and managed-rice wetlands is recommended.

Horgan, Finbarr G.; Stuart, Alexander M.; Kudavidanage, Enoka P.

2014-01-01

95

Estructura y neotectónica de Las Lomas de Olmedo, zona de transición entre los Sistemas Subandino y de Santa Bárbara, provincia de Salta Structure and neotectonics of the Lomas de Olmedo, a transition zone between the Subandean and Santa Bárbara Systems, province of Salta  

Directory of Open Access Journals (Sweden)

Full Text Available El presente estudio muestra las evidencias de deformación neotectónica en la región del noroeste argentino de lomas de Olmedo, provincia de Salta. Esta región ubicada en el frente orogénico a los 24°S de latitud comprende la zona de transición entre las Sierras Subandinas al norte, de tipo epidérmico con vergencia al este, o Sistema Subandino sensu stricto, y un segmento austral correspondiente al Sistema de Santa Bárbara producido por inversión tectónica de fallas normales con vergencia al oeste. Entre estos dos segmentos con diferente comportamiento se ubican las lomas de Olmedo, que muestran un complejo diseño de fallas activas. Depósitos de edad paleógena que constituyen las facies de hundimiento térmico de las fases finales del rift del Grupo Salta y los depósitos sinorogénicos neógenos de la cuenca de antepaís subandina, se hallan plegados y corridos sobre depósitos cuaternarios en el anticlinal de lomas de Olmedo. Los sedimentos terciarios están corridos sobre los depósitos lacustres de la Formación El Chorro de edad cuaternaria. Las edades 14C en conchillas de gasterópodos de esta unidad pertenecientes a Pomacea canaliculata arrojaron una edad de 7.962 ± 45 BP años para estos depósitos. Las fallas inversas con vergencia al este indican para la mayor parte del Holoceno una tasa de acortamiento orogénico de 2,34 mm/a para el frente tectónico en la zona de transición entre los dos sistemas de la faja plegada y corrida subandina.The present study shows evidence of neotectonic deformation in the Northwestern Argentina region of Lomas de Olmedo, province of Salta. This region is located in the orogenic front at 24°S latitude and encompasses a transition zone between the Sierras Subandinas to the north, a thin-skinned belt with east vergence, or Subandean System sensu stricto, and a southern segment corresponding to the Santa Bárbara System produced by tectonic inversion of normal faults with west vergence. Between this two segments of different behavior are the Lomas de Olmedo, which have a complex array of active faults. Paleogene deposits of the sag phases produced during thermal subsidence of the Salta rift system, and Neogene synorogenic deposits related to the Andean uplift are folded and thrust on the Quaternary deposits of the El Chorro Formation of Quaternary age. The 14C ages from gastropod shells from this unit belonging to Pomacea canaliculata yielded an age of 7,962 ± 45 BP years for these deposits. The reverse faults with east vergence indicate a shortening rate for most of the Holocene of 2.34 mm/a for the tectonic thrust front in the transition zone between the two fold and thrust belts of the Subandean area.

V.A. Ramos

2006-12-01

96

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)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese 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.

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

97

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  

Directory of Open Access Journals (Sweden)

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.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.

Roberta S. França

2007-03-01

98

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

Directory of Open Access Journals (Sweden)

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.

Serra, AB.

1997-01-01

99

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english 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.

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

100

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

Directory of Open Access Journals (Sweden)

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.

Liana K Jannotti-Passos

2010-07-01

 
 
 
 
101

Lymnaea cousini Jousseaume, 1887 (Gastropoda: Lymnaeidae): first record for Venezuela  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Lymnaea cousini Jousseaume, 1887 was collected in Mucubaji, Merida State, Venezuela, from a permanent pond located at a very high altitude (3760 m). Identification of the collected specimens was made by comparison with the original description of the shell by Jousseaume and the description of the renal organ and reproductive system of topotypic specimens by Paraense.

Jp, Pointier; Noya, O.; Amarista, M.; The?ron, A.

2004-01-01

102

Laboratory spawning of the purple snail Plicopurpura pansa (Gastropoda: Muricidae)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The spawning of the muricid gastropod Plicopurpura pansa in the laboratory at 22-23°C is described. Females deposited 1-20 capsules daily for at least 20 weeks, and produced up to 150 capsules each per spawning season. During spawning, egg clusters were formed consisting of hundreds of capsules of different ages deposited by different females. Each egg capsule contained an average of 436 embryos (± s.d. 213.6, range: 95- 1 092, n = 50). Embryos developed without nurse eggs. After six to eig...

Naegel, Ludwig C. A.

2004-01-01

103

Laboratory spawning of the purple snail Plicopurpura pansa (Gastropoda: Muricidae).  

Science.gov (United States)

The spawning of the muricid gastropod Plicopurpura pansa in the laboratory at 22-23 degrees C is described. Females deposited 1-20 capsules daily for at least 20 weeks, and produced up to 150 capsules each per spawning season. During spawning, egg clusters were formed consisting of hundreds of capsules of different ages deposited by different females. Each egg capsule contained an average of 436 embryos (+/- s.d. 213.6, range: 95-1092, n=50). Embryos developed without nurse eggs. After six to eight weeks of intracapsular, lecithotrophic development, planktotrophic veligers hatched with two fully developed velar lobes. PMID:17357400

Naegel, Ludwig C A

2004-03-01

104

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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.

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

105

New records for the Azorean opisthobranch fauna (Mollusca:Gastropoda).  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Seven new species of opisthobranchs are recorded for the first time from the Azores. These are: Aegires sublaevis Odhnerm, 1931; Doto koenneckeri Lemche, 1976; Doto furva Garcia-Gomez and Ortea Rato, 1983; Favorinus branchialis (Rathke, 1806); Facelina annulicornis (Charmisso and Eisenhardt, 1821); Cuthona caerulea (Montagu, 1804) and Cuthona foliata. (Forbes and Goodsit, 1838). The total number of opisthobranch species is thus extended to 116.

Calado, Gonc?alo

2002-01-01

106

Imposex in endemic volutid from Northeast Brazil (Mollusca: Gastropoda  

Directory of Open Access Journals (Sweden)

Full Text Available 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.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.

Ítalo Braga de Castro

2008-10-01

107

The phylogeography of Indoplanorbis exustus (Gastropoda: Planorbidae in Asia  

Directory of Open Access Journals (Sweden)

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.

Diaz Jose L

2010-07-01

108

Hydatina physis (Mollusca: Gastropoda: Opisthobranchia) from the Azores.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The opisthobranch gastropod Hydatina physis (Linné, 1758) is recorded from the Azores for the first time. The distribution of the species is reviewed. Colour photos of live animals are presented and colour variation of the species is discussed.

Wirtz, Peter

1999-01-01

109

Phylogeny and evolution of the Heterobranchia (Mollusca, Gastropoda)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Many questions regarding gastropod phylogeny have not yet been answered like the molecular confirmation of the Heterobranchia concept based on morphological studies from Haszprunar (1985a; 1988). This taxon contains the “Lower Heterobranchia” with several “primitive” or “basal” members) and the Euthyneura (with the Opisthobranchia and Pulmonata). Phylogenetic relationships of subgroups within the Heterobranchia have not been satisfactorily resolved and monophyly of some taxa withi...

Dinapoli, Angela

2009-01-01

110

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 ...

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

2009-01-01

111

A phylogeny of the land snails (Gastropoda: Pulmonata).  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We have undertaken the first large-scale molecular phylogenetic analysis of the Stylommatophora. Sequences of the ribosomal RNA gene-cluster were examined in 104 species of snails and slugs from 50 families, encompassing all the currently recognized major groups. It allows an independent test of the present classification based on morphology. At the level of families our molecular phylogeny closely supports the current taxonomy, but the deep branches within the tree do not. Surprisingly, a si...

2001-01-01

112

Familia Ellobiidae (Gastropoda: Archaeopulmonata) en el litoral peruano  

Scientific Electronic Library Online (English)

Full Text Available SciELO Peru | Language: Spanish Abstract in spanish 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.

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

113

Macrocyclis peruvianus (Gastropoda, Acavidae, an endemic land snail from Chile Macrocyclis peruvianus (Gastropoda, Acavidae, um caracol terrestre endêmico do Chile  

Directory of Open Access Journals (Sweden)

Full Text Available Macrocyclis peruvianus (Lamarck, 1822 is a large terrestrial snail which is endemic in Chile. A detailed description of its shell structure, jaw, radula, palial cavity and reproductive system is presented here for the first time.Macrocyclis peruvianus (Lamarck, 1822 é um grande caracol terrestre endêmico do Chile. Uma descrição detalhada da esculturação de sua concha, rádula, mandíbula, cavidade palial e sistema reprodutor são apresentados aqui pela primeira vez.

Leticia F. da Silva

2009-06-01

114

Macrocyclis peruvianus (Gastropoda, Acavidae), an endemic land snail from Chile / Macrocyclis peruvianus (Gastropoda, Acavidae), um caracol terrestre endêmico do Chile  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese Macrocyclis peruvianus (Lamarck, 1822) é um grande caracol terrestre endêmico do Chile. Uma descrição detalhada da esculturação de sua concha, rádula, mandíbula, cavidade palial e sistema reprodutor são apresentados aqui pela primeira vez. [...] Abstract in english Macrocyclis peruvianus (Lamarck, 1822) is a large terrestrial snail which is endemic in Chile. A detailed description of its shell structure, jaw, radula, palial cavity and reproductive system is presented here for the first time. [...

Leticia F. da, Silva; José W., Thomé.

115

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

Directory of Open Access Journals (Sweden)

Full Text Available 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 mantle 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.

Rosane Lanzer

1996-01-01

116

Snails and trematode infection after Indian Ocean tsunami in Phang-Nga Province, southern Thailand.  

Science.gov (United States)

The tsunami and non-tsunami affected areas of Takua Pa District, Phang-Nga Province were investigated for fresh- and brackish-water snails that transmit human parasitic diseases during 2006 and 2007. Among 46 snail species found, 17 species of 8 families were freshwater snails, 28 species of another 7 families were brackish-water snails, and 1 species was a land snail. Of these species, 11 freshwater snails, 4 brackish-water snails and 1 land snail were of medical importance. The fresh-water snails were Pomacea canaliculata, Pila angelica, P. gracilis, P. polita, Filopaludina (S.) martensi, F. (F.) s. polygramma, Melanoides tuberculata, Indoplanorbis exuxtus, Radix rubiginosa, Helicorbis umbilicalis, Gyraulus convexiusculus. Four brackish-water snails were Cerithidea cingulata, C. djadjarensis, C. alata, Sermyla riqueti and Achatina fulica was the land snail. I. exutus, M. tuberculata and F. (F.) s. polygramma harbored Xiphidio, Microcercus, Furocercus, Echinostome cercariae, and cercaria without eyespots or tail with hair. Three species of brackish-water snails, Cerithidia cingulata, C. djadjariensis, and C. alata presented with 6 types of trematode cercariae and rediae. Knowledge of medically important snails and their parasitic diseases, and prevention were given to Takua Pa people by poster, pamphlets and broadcasting through community radio. PMID:20578482

Sri-Aroon, Pusadee; Chusongsang, Phiraphol; Chusongsang, Yupa; Pornpimol, Surinthwong; Butraporn, Piyarat; Lohachit, Chantima

2010-01-01

117

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

Directory of Open Access Journals (Sweden)

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.

Moore Catrin E

2008-04-01

118

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

2008-07-01

119

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)

Full Text Available SciELO Peru | Language: Spanish Abstract in spanish 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.

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

120

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

Directory of Open Access Journals (Sweden)

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.

A. C. M. Horn

2005-08-01

 
 
 
 
121

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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. Abstract in english 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 u [...] sed 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.

A. C. M., Horn; A., Achaval; D. M., Zancan.

122

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  

Directory of Open Access Journals (Sweden)

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.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.

Eduardo Colley

2012-03-01

123

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)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 muricatu...

2011-01-01

124

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 espécie...

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

2009-01-01

125

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)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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.

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

126

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)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] 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.

Daniele Pedrosa, Monteiro; Sônia Barbosa dos, Santos.

127

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

Directory of Open Access Journals (Sweden)

Full Text Available 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.

Daniele Pedrosa Monteiro

2001-12-01

128

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  

Directory of Open Access Journals (Sweden)

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 provenientes 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 carnívorasThis 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 1996 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

DAVID VELIZ

2000-12-01

129

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  

Directory of Open Access Journals (Sweden)

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 (pIntroduction: 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<0.001 of S. aureus (12.64 % and E. coli (12.1 % compared to the positive control of growth inhibition using chloramphenicol. Conclusions: according to these results, the saline-acid solution proved to be more efficient in extracting molecules with antibacterial activity that are likely to be antimicrobial peptides from C. muricatus.

Annia Alba Menéndez

2011-08-01

130

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)

Full Text Available SciELO Cuba | Language: Spanish Abstract in spanish 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

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

131

Estructura y neotectónica de Las Lomas de Olmedo, zona de transición entre los Sistemas Subandino y de Santa Bárbara, provincia de Salta / Structure and neotectonics of the Lomas de Olmedo, a transition zone between the Subandean and Santa Bárbara Systems, province of Salta  

Scientific Electronic Library Online (English)

Full Text Available SciELO Argentina | Language: Spanish Abstract in spanish El presente estudio muestra las evidencias de deformación neotectónica en la región del noroeste argentino de lomas de Olmedo, provincia de Salta. Esta región ubicada en el frente orogénico a los 24°S de latitud comprende la zona de transición entre las Sierras Subandinas al norte, de tipo epidérmic [...] o con vergencia al este, o Sistema Subandino sensu stricto, y un segmento austral correspondiente al Sistema de Santa Bárbara producido por inversión tectónica de fallas normales con vergencia al oeste. Entre estos dos segmentos con diferente comportamiento se ubican las lomas de Olmedo, que muestran un complejo diseño de fallas activas. Depósitos de edad paleógena que constituyen las facies de hundimiento térmico de las fases finales del rift del Grupo Salta y los depósitos sinorogénicos neógenos de la cuenca de antepaís subandina, se hallan plegados y corridos sobre depósitos cuaternarios en el anticlinal de lomas de Olmedo. Los sedimentos terciarios están corridos sobre los depósitos lacustres de la Formación El Chorro de edad cuaternaria. Las edades 14C en conchillas de gasterópodos de esta unidad pertenecientes a Pomacea canaliculata arrojaron una edad de 7.962 ± 45 BP años para estos depósitos. Las fallas inversas con vergencia al este indican para la mayor parte del Holoceno una tasa de acortamiento orogénico de 2,34 mm/a para el frente tectónico en la zona de transición entre los dos sistemas de la faja plegada y corrida subandina. Abstract in english The present study shows evidence of neotectonic deformation in the Northwestern Argentina region of Lomas de Olmedo, province of Salta. This region is located in the orogenic front at 24°S latitude and encompasses a transition zone between the Sierras Subandinas to the north, a thin-skinned belt wit [...] h east vergence, or Subandean System sensu stricto, and a southern segment corresponding to the Santa Bárbara System produced by tectonic inversion of normal faults with west vergence. Between this two segments of different behavior are the Lomas de Olmedo, which have a complex array of active faults. Paleogene deposits of the sag phases produced during thermal subsidence of the Salta rift system, and Neogene synorogenic deposits related to the Andean uplift are folded and thrust on the Quaternary deposits of the El Chorro Formation of Quaternary age. The 14C ages from gastropod shells from this unit belonging to Pomacea canaliculata yielded an age of 7,962 ± 45 BP years for these deposits. The reverse faults with east vergence indicate a shortening rate for most of the Holocene of 2.34 mm/a for the tectonic thrust front in the transition zone between the two fold and thrust belts of the Subandean area.

Ramos, V.A.; Alonso, R.N.; Strecker, M..

132

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)

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.

Ana L. Suriani

2007-03-01

133

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)

1988-01-01

134

[Population genetic structure of the gastropod Nucella heyseana (Gastropoda: Muricidae) from the Sea of Japan].  

Science.gov (United States)

To study the Far East gastropod Nucella heyseana (Dunker, 1882), 15 samples were collected in the northwestern region of the Sea of Japan from Pos'et Bight of the Peter the Great Bay in the south to the Valentin Bight in the northeast of Primorye. The genetic variation for four to ten polymorphic allozyme markers and the morphometric variation for five shell traits were analyzed. The interspecific genetic differentiation (as compared with the interspecific variation in sympatric regions) and the comparative between-year variation clearly showed that genetically uniform, thought subdivided, populations occupy each region of a particular bight and groups of regions within the area under study. In total, three local populations were observed in the area; their morphometric differentiation was consistent with their genetic structure. PMID:19705748

Chichvarkhina-Svin'ina, O V; Kartavtsev, Iu F

2009-07-01

135

Sympatric Biomphalaria species (Gastropoda: Planorbidae in Lake Albert, Uganda, show homoplasies in shell morphology  

Directory of Open Access Journals (Sweden)

Full Text Available The three known sympatricBiomphalaria species that occur in Lake Albert; B. choanomphala, B. stanleyi and B. sudanica, were studied using both molecular (COI, 16S and ITS and shell morphometric data. An unidentified sample of 18 Biomphalaria specimens from Lake Albert were divided in three morphotypes according to aperture height and coiling rate and subsequently identified through molecular inferences and morphometry. The 18 specimens were identified as follows; six specimens were identified as B. sudanica, seven species as B. stanleyi, four as B. cf. choanomphala and a single specimen as B. pfeifferi. The latter was inferred with strong molecular support only, since it had similar shell morphology to typical B. stanleyi snails, thus it might be an ecophenotypic form of B. pfeifferi adapted to a lacustrine environment. Biomphalaria stanleyi exists in forms that resemble B. choanomphala, and B. choanomphala has further overlap in morphology with B. smithi. However, the results showed some disagreement between molecular and morphometric identification, hence making it difficult to rely on shell morphology alone in identification. Overall the morphometric analysis divided Biomphalaria in two possible ecophenotypes i.e. a lacustrine type with rapidly increasing whorls and relatively high apertures and a non-lacustrine type (including snails inhabiting lake edges with slowly increasing whorls and low apertures.

Thomas K. Kristensen

2011-10-01

136

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

Directory of Open Access Journals (Sweden)

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.

Amina Essawy

2001-01-01

137

Catalogue annoté des Gastéropodes terrestres (Mollusca, Gastropoda de la région Nord - Pas-de-Calais  

Directory of Open Access Journals (Sweden)

Full Text Available An annotated checklist of land snails and slugs of Nord – Pas-de-Calais region is provided. It updates the knowledge on this group on the basis of the recent checklist of the non-marine Molluscs of France and includes recent data on systematics. Each species is annotated and data on ecology, distribution and status are given.

Xavier Cucherat

2006-01-01

138

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish 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.

Alberto de Jesús, Navarrete.

139

Pagodulina subdola (Gredler, 1856 (Gastropoda, Stylommatophora, Orculidae fait bien partie de la faune de France  

Directory of Open Access Journals (Sweden)

Full Text Available Although Pagodulina subdola may have been collected in France as soon as 1850, taxonomical and geographical confusions and lacks have led to consider it as a species distributed from the southern side of central Alps to the Peloponnese through the Balkans. Here we report the westernmost populations for that species and confirm its occurrence in France from the Southern Alps, in beech forests mainly facing north above 700 m elevation.

Olivier Gargominy

2008-01-01

140

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

Directory of Open Access Journals (Sweden)

Full Text Available 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 been 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.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 ainda 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.

Daniel Abbate

2013-01-01

 
 
 
 
141

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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).

Abbate, Daniel; Cavallari, Daniel Caracanhas.

142

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

Directory of Open Access Journals (Sweden)

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.

Md. Sarwar Jahan

2001-01-01

143

Annotated type catalogue of the Amphibulimidae (Mollusca, Gastropoda, Orthalicoidea in the Natural History Museum, London  

Directory of Open Access Journals (Sweden)

Full Text Available The type status is described of 39 taxa classified within the family Amphibulimidae (superfamily Orthalicoidea and kept in the London museum. One taxon, Bulimus elaeodes Pfeiffer, 1853, is removed to the Strophocheilidae. Lectotypes are designated for Bulimus adoptus Reeve, 1849; Bulimus (Eurytus eros Angas, 1878; Helix onca d’Orbigny, 1835; Amphibulima pardalina Guppy, 1868. The type status of the following taxon is changed to lectotype in accordance with Art. 74.6 ICZN: Strophocheilus (Dryptus jubeus Fulton, 1908.As general introduction to this and following papers on Orthalicoid types in the Natural History Museum, a brief history of the London collection is given and several examples of handwriting from different authors are presented.

Jonathan Ablett

2011-10-01

144

Annotated type catalogue of the Amphibulimidae (Mollusca, Gastropoda, Orthalicoidea) in the Natural History Museum, London  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The type status is described of 39 taxa classified within the family Amphibulimidae (superfamily Orthalicoidea) and kept in the London museum. One taxon, Bulimus elaeodes Pfeiffer, 1853, is removed to the Strophocheilidae. Lectotypes are designated for Bulimus adoptus Reeve, 1849; Bulimus (Eurytus) eros Angas, 1878; Helix onca d'Orbigny, 1835; Amphibulima pardalina Guppy, 1868. The type status of the following taxon is changed to lectotype in accordance with Art. 74.6 ICZN: Strophocheilus (Dr...

Breure, Abraham S. H.; Ablett, Jonathan D.

2011-01-01

145

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

Directory of Open Access Journals (Sweden)

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.

Dilian Georgiev

2014-04-01

146

Histopathological effects of phenol on the digestive gland of amphimelania holandri fer. (gastropoda, prosobranchia)  

Energy Technology Data Exchange (ETDEWEB)

Phenolic wastes are common water pollutants generated from a variety of industrial processes used in oil refineries, gas operations, coke ovens, coal gasification and by natural processes such as the decomposition of plant matter. Relatively high concentrations of phenol are found in rivers near the outlets of channels into which industrial waste waters have been discharged. There are data about the toxic effects of phenol on fish, and on some invertebrates, including snails. However, little is known about histopathological changes induced by phenol`s toxic effects, and these changes might be a basic indicator in assessing the condition of a particular water ecosystem. The existing data are mostly relevant for fish, and we know very little about the snail`s histopathology; however, the snail is a good research model due to its effectiveness as a pollution indicator species. This study attempts to establish the structure of the normal digestive gland and histopathological changes as a result of exposure to phenol. 22 refs., 4 figs.

Lajtner, J.; Erben, R.; Klobucar, G.I.V. [Univ. of Zagreb, Zagreb (Croatia)

1996-12-31

147

Dextral and sinistral Amphidromus inversus (Gastropoda: Pulmonata: Camaenidae) produce dextral sperm.  

Science.gov (United States)

Coiling direction in pulmonate gastropods is determined by a single gene via a maternal effect, which causes cytoskeletal dynamics in the early embryo of dextral gastropods to be the mirror image of the same in sinistral ones. We note that pulmonate gastropod spermatids also go through a helical twisting during their maturation. Moreover, we suspect that the coiling direction of the helical elements of the spermatozoa may affect their behaviour in the female reproductive tract, giving rise to the possibility that sperm chirality plays a role in the maintenance of whole-body chiral dimorphism in the tropical arboreal gastropod Amphidromus inversus (Müller, 1774). For these reasons, we investigated whether there is a relationship between a gastropod's body chirality and the chirality of the spermatozoa it produces. We found that spermatozoa in A. inversus are always dextrally coiled, regardless of the coiling direction of the animal itself. However, a partial review of the literature on sperm morphology in the Pulmonata revealed that chiral dimorphism does exist in certain species, apparently without any relationship with the coiling direction of the body. Though our study shows that body and sperm chirality follows independent developmental pathways, it gives rise to several questions that may be relevant to the understanding of the chirality of spermatid ultrastructure and spermatozoan motility and sexual selection. PMID:22131641

Schilthuizen, Menno; van Heuven, Bertie-Joan

2011-12-01

148

Dextral and sinistral Amphidromus inversus (Gastropoda: Pulmonata: Camaenidae) produce dextral sperm  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Coiling direction in pulmonate gastropods is determined by a single gene via a maternal effect, which causes cytoskeletal dynamics in the early embryo of dextral gastropods to be the mirror image of the same in sinistral ones. We note that pulmonate gastropod spermatids also go through a helical twisting during their maturation. Moreover, we suspect that the coiling direction of the helical elements of the spermatozoa may affect their behaviour in the female reproductive tract, giving rise to...

2011-01-01

149

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

Directory of Open Access Journals (Sweden)

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.

Stanislava Y. Vasileva

2009-07-01

150

First occurrence of the Kentish Snail Monacha cantiana (Mollusca: Gastropoda: Hygromiidae) in the Czech Republic  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We document the first occurrence of the Kentish Snail Monacha cantiana (Montagu, 1803) from Prague, Czech Republic. During autumn 2009, an abundant population of M. cantiana was found at sites with suitable vegetation and microclimatic conditions, predominantly composed of grassy vegetation cover. It is expected that this species will continue to spread in the Czech Republic.

C?, Jaroslav Hlava?c?; Alena Peltanová

2010-01-01

151

A new record of Oxychilus alliarius (Gastropoda: Zonitidae) with the species distribution in the Czech Republic  

Digital Repository Infrastructure Vision for European Research (DRIVER)

A new finding of the land snail species Oxychilus alliarius was recorded in the Czech Republic. This West European species was found in the six isolated sites during the last thirteen years always in western part of Bohemia. This paper brings new information on the distribution of Oxychilus alliarius in the Czech Republic.

Jitka Horá?ková; Lucie Ju?i?ková

2009-01-01

152

Larval rearing, metamorphosis, growth and reproduction of the eolid nudibranch hermissenda crassicornis (eschscholtz, 1831) (gastropoda: opisthobranchia).  

Science.gov (United States)

1. Hermissenda crassicornis is a subannual nudibranch species that reproduces year-round. 2. There is a significant positive relationship between adult weight, diameter of the egg mass, estimated number of eggs per egg mass, and average number of eggs per capsule. 3. There is a planktonic veliger stage of 34 days minimum at 13 degrees -15 degrees C. 4. Larvae metamorphose on at least three species of hydroids. 5. To develop in reasonable numbers to a state competent to metamorphose veligers require a diet that includes phytoplankton of larger cell size (10-11 microm) than the commonly used Isochrysis and Monochrysis (5 microm). 6. Although Hermissenda feeds on a wide variety of sessile invertebrate species in the ocean, a diet of tunicate alone (Ciona intestinalis) promotes good growth and survival in the laboratory. 7. Egg mass deposition is initiated only after first copulation, except in the last month of life, and continues from about one-month post-metamorphosis to death, at about four months post-metamorphosis. Generation time (egg-to-egg) may be as short as 2.5 months. 8. A laboratory strain of Hermissenda is being established to provide animals of known history for research on the neural correlates of behavior. Animals, at least initially, are being selected for fast growth rate. PMID:20693369

Harrigan, J F; Alkon, D L

1978-06-01

153

A new record of Oxychilus alliarius (Gastropoda: Zonitidae with the species distribution in the Czech Republic  

Directory of Open Access Journals (Sweden)

Full Text Available A new finding of the land snail species Oxychilus alliarius was recorded in the Czech Republic. This West European species was found in the six isolated sites during the last thirteen years always in western part of Bohemia. This paper brings new information on the distribution of Oxychilus alliarius in the Czech Republic.

Lucie Ju?i?ková

2009-12-01

154

Comparative morphology of Astraea latispina (Philippi, 1844 and Astraea olfersii (Philippi, 1846 (Mollusca, Gastropoda, Turbinidae  

Directory of Open Access Journals (Sweden)

Full Text Available The present study examines comparatively the soft parts of turbinids Astraea latispina and Astraea olfersii. The characters of soft parts of these species, in agreement with Trochoidea organization, allow a differencial diagnosis on the cefalic lappets, appendix of eye-stalk, hypobranchial glands, jaws, radulae, and stomach spiral caecum, which information will be helpful in taxonomic studies.

MONTEIRO J. C.

2002-01-01

155

Macroevolution of venom apparatus innovations in auger snails (Gastropoda; Conoidea; Terebridae).  

Science.gov (United States)

The Terebridae are a diverse family of tropical and subtropical marine gastropods that use a complex and modular venom apparatus to produce toxins that capture polychaete and enteropneust preys. The complexity of the terebrid venom apparatus suggests that venom apparatus development in the Terebridae could be linked to the diversification of the group and can be analyzed within a molecular phylogenetic scaffold to better understand terebrid evolution. Presented here is a molecular phylogeny of 89 terebrid species belonging to 12 of the 15 currently accepted genera, based on Bayesian inference and Maximum Likelihood analyses of amplicons of 3 mitochondrial (COI, 16S and 12S) and one nuclear (28S) genes. The evolution of the anatomy of the terebrid venom apparatus was assessed by mapping traits of six related characters: proboscis, venom gland, odontophore, accessory proboscis structure, radula, and salivary glands. A novel result concerning terebrid phylogeny was the discovery of a previously unrecognized lineage, which includes species of Euterebra and Duplicaria. The non-monophyly of most terebrid genera analyzed indicates that the current genus-level classification of the group is plagued with homoplasy and requires further taxonomic investigations. Foregut anatomy in the family Terebridae reveals an inordinate diversity of features that covers the range of variability within the entire superfamily Conoidea, and that hypodermic radulae have likely evolved independently on at least three occasions. These findings illustrate that terebrid venom apparatus evolution is not perfunctory, and involves independent and numerous changes of central features in the foregut anatomy. The multiple emergence of hypodermic marginal radular teeth in terebrids are presumably associated with variable functionalities, suggesting that terebrids have adapted to dietary changes that may have resulted from predator-prey relationships. The anatomical and phylogenetic results presented serve as a starting point to advance investigations about the role of predator-prey interactions in the diversification of the Terebridae and the impact on their peptide toxins, which are promising bioactive compounds for biomedical research and therapeutic drug development. PMID:22440724

Castelin, M; Puillandre, N; Kantor, Yu I; Modica, M V; Terryn, Y; Cruaud, C; Bouchet, P; Holford, M

2012-07-01

156

Macroevolution of venom apparatus innovations in auger snails (Gastropoda; Conoidea; Terebridae)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The Terebridae are a diverse family of tropical and subtropical marine gastropods that use a complex and modular venom apparatus to produce toxins that capture polychaete and enteropneust preys. The complexity of the terebrid venom apparatus suggests that venom apparatus development in the Terebridae could be linked to the diversification of the group and can be analyzed within a molecular phylogenetic scaffold to better understand terebrid evolution. Presented here is a molecular phylogeny o...

2012-01-01

157

Bacteriological and biochemical assessment of marinating cephalopods, crustaceans and gastropoda during 24 weeks of storage.  

Science.gov (United States)

The quality and safety parameters of mixed marinated seafood salad containing common octopus (Octopus vulgaris), shrimp (Parapenaeus longirostris), European squid (Loligo vulgaris), sea snail (Rapana thomasiana) and common cuttlefish (Sepia officinalis) at 4 degrees C during storage of 24 weeks were investigated. In addition, the nutritional value in terms of proximate and fatty acid composition of seafood salad was also determined. Sensory scores of seafood salad in terms of appearance, odour, flavour and texture slightly decreased throughout the storage period. However, at the end of the storage period (5 months), the marinated seafood salad was still acceptable by the panellist. At the beginning of storage the total volatile basic nitrogen (TVB-N) value was 6.05 mg/100 g flesh, and the TVB-N values rose to 11.19 mg TVB-N/flesh by the end of the storage period. The pH value of the marinated seafood salad showed fluctuations, ranging from 3.57 to 3.65, and did not change significantly during the storage period. The concentrations of the biogenic amines in both the muscle of all species and in the solution of salad were also investigated. Among the biogenic amines, histamine was not detected in all samples throughout the storage period. The putrescine and cadaverine levels increased throughout the storage period, with a lower increase in the solution of seafood salad. Salmonella, coliform, Escherichia coli and Staphylococcus aureus were not detected while the total viable count remained low (3 log CFU/g) after 3 months of storage. PMID:19086240

Ozogul, Yesim; Ozogul, Fatih; Olgunoglu, Ilkan A; Kuley, Esmeray

2008-09-01

158

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

Directory of Open Access Journals (Sweden)

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.

Marlene T. Ueta

1980-12-01

159

Bridging gaps in the molecular phylogeny of the Lymnaeidae (Gastropoda: Pulmonata, vectors of Fascioliasis  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background Lymnaeidae snails play a prominent role in the transmission of helminths, mainly trematodes of medical and veterinary importance (e.g., Fasciola liver flukes. As this family exhibits a great diversity in shell morphology but extremely homogeneous anatomical traits, the systematics of Lymnaeidae has long been controversial. Using the most complete dataset to date, we examined phylogenetic relationships among 50 taxa of this family using a supermatrix approach (concatenation of the 16 S, ITS-1 and ITS-2 genes, representing 5054 base pairs involving both Maximum Likelihood and Bayesian Inference. Results Our phylogenetic analysis demonstrates the existence of three deep clades of Lymnaeidae representing the main geographic origin of species (America, Eurasia and the Indo-Pacific region. This phylogeny allowed us to discuss on potential biological invasions and map important characters, such as, the susceptibility to infection by Fasciola hepatica and F. gigantica, and the haploid number of chromosomes (n. We found that intermediate hosts of F. gigantica cluster within one deep clade, while intermediate hosts of F. hepatica are widely spread across the phylogeny. In addition, chromosome number seems to have evolved from n = 18 to n = 17 and n = 16. Conclusion Our study contributes to deepen our understanding of Lymnaeidae phylogeny by both sampling at worldwide scale and combining information from various genes (supermatrix approach. This phylogeny provides insights into the evolutionary relationships among genera and species and demonstrates that the nomenclature of most genera in the Lymnaeidae does not reflect evolutionary relationships. This study highlights the importance of performing basic studies in systematics to guide epidemiological control programs.

Pointier Jean-Pierre

2010-12-01

160

A new hygromiid for the Iberian malacofauna: Candidula corbellai n. sp. (Gastropoda, Pulmonata.  

Directory of Open Access Journals (Sweden)

Full Text Available We report a new Iberian hygromiid, Candidula corbellai n. sp., and describe its conchological and anatomical characteristics. This new species is compared with two other Iberian endemic species, Candidula camporroblensis and C. rocandioi, which present similarities in the reproductive system, such as the long flagellum. The shell of the new species is compared with specimens of the type series of these taxa. The reproductive system of C. corbellai n. sp. is distinguished from C. camporroblensis by its longer male part, although the flagellum is shorter than the penis and epiphallus together and it has a long bursa copulatrix with respect to its duct, which is shorter. The epiphallus and the bursa copulatrix duct are longer in C. rocandioi than in C. corbellai n. sp. A geographical distribution map of the three species in the Iberian peninsula is shown.

Martínez-Ortí, A.

2011-01-01

 
 
 
 
161

Consumo quantitativo e qualitativo de Perifíton colonizado em substrato artificial Biomphalaria Tenagophila (Gastropoda, Planorbidae)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Moluscos criados no campo em gaiolas transparentes e escurecidas apresentaram o mesmo consumo diário de perifíron; entretanto nas primeiras existia maior proporção de organismos vegetais e nas últimas maior proporção de organismos animais. O consumo diário por molusco foi significamente maior em presença de maiores quantidades de alimento, porém a proporção consumida do total de alimento disponível decresceu.Snails reared in the field in transparent and darkened cages consume...

1986-01-01

162

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

Directory of Open Access Journals (Sweden)

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.

Alberto de Jesús Navarrete

2001-03-01

163

Biological aspects of Omalonyx convexus (Mollusca, Gastropoda, Succineidae from the Rio Grande do Sul State, Brazil  

Directory of Open Access Journals (Sweden)

Full Text Available Omalonyx convexus (Heynemann, 1868 is widely spread throughout the Rio Grande do Sul State, Brazil. The studied specimens presented in vivo, tegument and mantle coloring in variations between milky-white, orange and beige. The shell presented itself covered by the mantle in different extents; however, it was not completely covered on any of the specimens. The feeding diet is basically constituted by vegetal tissues, although non-vegetal food items were also found. The specimens were found in preserved and in polluted fresh water environments, as well as on natural and artificial substrates. The temperature throughout the day influences their placement on habitat substrates.

Janine Oliveira Arruda

2011-12-01

164

Short-term climate change and the extinction of the snail Rhachistia aldabrae (Gastropoda: Pulmonata)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The only known population of the Aldabra banded snail Rhachistia aldabrae declined through the late twentieth century, leading to its extinction in the late 1990s. This occurred within a stable habitat and its extinction is attributable to decreasing rainfall on Aldabra atoll, associated with regional changes in rainfall patterns in the late twentieth and early twenty-first century. It is proposed that the extinction of this species is a direct result of decreasing rainfall leading to increas...

2007-01-01

165

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

Directory of Open Access Journals (Sweden)

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.

Örstan, A.

2010-01-01

166

Reproductive biology of Oxychilus(Atlantoxychilus) spectabilis (Milne-Edwards, 1885) (Gastropoda: Pulmonata): a gametogenic approach  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The taxonomic status and anatomy of Oxychilus (Atlantoxychilus) spectabilis (Milne-Edwards, 1885), an endemic land snail from Santa Maria Island, Azores, has been subject of detailed study, yet information about its life history is wanting. This study describes the reproductive cycle of O. (A.) spectabilis and assesses the validity of three morphometric shell parameters as maturation diagnostic characters. Our results indicate that individuals are reproductively more active from May to Novemb...

Ferreira, Ana Filipa; Martins, Anto?nio M. Frias; Cunha, Regina Trista?o Da; Melo, Paulo Jorge; Rodrigues, A. R.

2013-01-01

167

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

Directory of Open Access Journals (Sweden)

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.

Nóblega H.G.

2003-01-01

168

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english 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.

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

169

First occurrence of the Kentish Snail Monacha cantiana (Mollusca: Gastropoda: Hygromiidae in the Czech Republic  

Directory of Open Access Journals (Sweden)

Full Text Available We document the first occurrence of the Kentish Snail Monacha cantiana (Montagu, 1803 from Prague, Czech Republic. During autumn 2009, an abundant population of M. cantiana was found at sites with suitable vegetation and microclimatic conditions, predominantly composed of grassy vegetation cover. It is expected that this species will continue to spread in the Czech Republic.

Alena Peltanová

2010-06-01

170

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 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)

2006-04-01

171

Latitudinal variation of freeze tolerance in intertidal marine snails of the genus melampus (gastropoda: ellobiidae).  

Science.gov (United States)

Abstract Low temperatures limit the poleward distribution of many species such that the expansion of geographic range can only be accomplished via evolutionary innovation. We have tested for physiological differences among closely related species to determine whether their poleward latitudinal ranges are limited by tolerance to cold. We measured lower temperature tolerance (LT50) among a group of intertidal pulmonate snails from six congeneric species and nine locales. Differences in tolerance are placed in the context of a molecular phylogeny based on one mitochondrial (cytochrome oxidase subunit I) and two nuclear (histone 3 and a mitochondrial phosphate carrier protein) markers. Temperate species from two separate lineages had significantly lower measures of LT50 than related tropical species. Range differences within the temperate zone, however, were not explained by LT50. These results show that multiple adaptations to cold and freezing may have enabled range expansions out of the tropics in Melampus. However, northern range limits within temperate species are not governed by cold tolerance alone. PMID:24940916

Dennis, A B; Loomis, S H; Hellberg, M E

2014-01-01

172

Monoamines in the pedal plexus of the land snail Megalobulimus oblongus (Gastropoda, Pulmonata)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english In molluscs, the number of peripheral neurons far exceeds those found in the central nervous system. Although previous studies on the morphology of the peripheral nervous system exist, details of its organization remain unknown. Moreover, the foot of the terrestrial species has been studied less tha [...] n that of the aquatic species. As this knowledge is essential for our experimental model, the pulmonate gastropod Megalobulimus oblongus, the aim of the present study was to investigate monoamines in the pedal plexus of this snail using two procedures: glyoxylic acid histofluorescence to identify monoaminergic structures, and the unlabeled antibody peroxidase anti-peroxidase method using antiserum to detect the serotonergic component of the plexus. Adult land snails weighing 48-80 g, obtained from the counties of Barra do Ribeiro and Charqueadas (RS, Brazil), were utilized. Monoaminergic fibers were detected throughout the pedal musculature. Blue fluorescence (catecholamines, probably dopamine) was observed in nerve branches, pedal and subepithelial plexuses, and in the pedal muscle cells. Yellow fluorescence (serotonin) was only observed in thick nerves and in muscle cells. However, when immunohistochemical methods were used, serotonergic fibers were detected in the pedal nerve branches, the pedal and subepithelial plexuses, the basal and lateral zones of the ventral integument epithelial cells, in the pedal ganglion neurons and beneath the ventral epithelium. These findings suggest catecholaminergic and serotonergic involvement in locomotion and modulation of both the pedal ganglion interneurons and sensory information. Knowledge of monoaminergic distribution in this snail´s foot is important for understanding the pharmacological control of reflexive responses and locomotive behavior.

M.C., Faccioni-Heuser; D.M., Zancan; M., Achaval.

173

Foraminiferans as food for Cephalaspideans (Gastropoda: Opisthobranchia), with notes on secondary tests around calcareous foraminiferans  

DEFF Research Database (Denmark)

The food of four species of Cephalaspidea (Philine aperta, Philine denticulata, Philine scabra and Cylichna cylindracea) was studied in animals collected on silty clay bottoms at 20-35 m depth on the west coast of Sweden. The specimens were dissected. Only calcareous foraminiferans were found in the gizzard. Very small amounts of foreign particles were ingested. The foraminiferans were crushed in the gizzard and dissolved during their passage through the intestine and no remains of them could be identified in the fecal pellets. The three dominant foraminiferans in the habitat were one calcareous species, Ammonia batavus and two agglutinating species, Ammoscalaria pseudospiralis and Ammotium cassis. The test (shell) material of the latter two species was sand grains (quartz). It was inferred that the gastropods avoid agglutinating foraminiferans as food. Many calcareous but not agglutinating foraminiferans surround themselves with a â??secondary testâ?, a cyst or covering of foreign particles around the test. This structure has earlier been called a â??reproductive cystâ? or â??feeding cystâ? in some species. â??Secondary testsâ? are primarily connected with feeding, but might also be a preadaptation for other purposes. It might, in species like Ammonia batavus, have become a kind of antipredatory device or mimicry. A predator might conceive such a species as an agglutinating species and neglect it. The secondary test is a delicate structure in most species and is easily destroyed by the rough sampling and handling methods conventionally used. This structure is therefore not very well known.

Cedhagen, Tomas

1996-01-01

174

Shape and growth in European Atlantic Patella limpets (Gastropoda, Mollusca. Ecological implications for survival  

Directory of Open Access Journals (Sweden)

Full Text Available Specimens of Patella intermedia, Patella rustica, Patella ulyssiponensis, and Patella vulgata were analyzed for shell and radula characteristics. Shell growth in P. rustica and P. ulyssiponensis was basically isometric, indicating that shell shape was constant during growth. On the contrary, shell growth in P. intermedia and P. vulgata was positively allometric, indicating that as shells increased in size, the base became more circular and the cone more centred and relatively higher. Radula relative size increased in the order P. ulyssiponensis, P. vulgata, P. intermedia and P. rustica, and had negative allometric growth in all species, indicating that radula grew less as shell increased in size. Data reported in the literature estimated that the lowest risk of dislodgment for a limpet is associated with a centred apex, and a (shell height/(shell length or (shell height/(shell width ratio of ca. 0.53. However, as reported for other limpets, in all four studied Patella species, shells were more eccentric and flat than this theoretical optimum. Data reported in the literature indicated that, in limpets, decreasing the (shell base perimeter/(shell volume or (shell surface area/(shell volume ratios by increasing size results in lower soft body temperature and desiccation. In the present study, P. rustica shells displayed the lowest ratios, and P. ulyssiponensis shells, the highest. Considering that the former species lives at high shore levels, and the latter species at low levels, it appeared that shell shape in European Atlantic limpets can be directly related to resistance to desiccation and high temperature stresses. Radula relative size (in relation to shell height also increased with increasing level in the shore, suggesting that this might be due to a decreasing abundance of algae with increasing shore level.

J. Paulo Cabral

2007-03-01

175

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

Directory of Open Access Journals (Sweden)

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.

Igor P. Bondarev

2013-10-01

176

Morphological variation in Lacuna parva (Gastropoda: Littorinidae) from different European populations  

Science.gov (United States)

Shells of the littorinid gastropod Lacuna parva were compared from 23 European localities and postglacial deposits in Sweden. The shells from the recent and the postglacial populations are similar with the exception of the recent population from Ellekilde Hage, Øresund, Denmark. Shells from Ellekilde Hage are different in having especially well developed whorls and only one colour morph. Differences in life-cycle and radula morphometrics further distinguish the Ellekilde Hage population from populations from the Isle of Wight, UK, and Roscoff, France. No striking differences in penial morphology were observed between the populations. It is suggested that low salinity and subtidal occurrence might be the causative agents of the conchological differences exhibited by the Øresund population.

Jørgensen, Aslak

2002-08-01

177

A New Record of Cymatium encausticum (Ranellidae: Tonnoidea: Gastropoda from Korea  

Directory of Open Access Journals (Sweden)

Full Text Available The Cymatium Roding, 1798 is a small- to large-sized marine gastropod genus. Three species has been reported thus far for Cymatium in the Korean waters. In general, Cymatium encausticum (Reeve, 1844 is known to occur in tropical seawaters including the Philippine Islands along with its congeners C. gutturnium, C. springsteeni, and C. exile. A single individual of the species was collected from Jejudo Island by SCUBA diving and morphological features were observed using a stereomicroscope. This is the first study to report the occurrence of Cymatium encausticum (Reeve, 1844 from the Korean waters, providing a detailed description of the species with the illustration for the shell morphology.

Junhee Lee1

2012-07-01

178

Aminotransferases activity in the hemolymph of Bradybaena similaris (Gastropoda, Xanthonychidae) under starvation  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english Aminotransferases (GOT and GPT) activities in the hemolymph of Bradybaena similaris under experimental condition of starvation were studied. At the 10th day of starvation, GOT activity was 416.6% higher than that observed in the fed snails, being reduced and ranging values near to that shown by the [...] control group onwards. GPT activity only varied significantly at the day-30 of starvation. The results were discussed.

Jairo, Pinheiro; Edna Maria, Gomes; Generoso Manoel, Chagas.

179

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

Directory of Open Access Journals (Sweden)

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.

Diéguez Fernández, L

2012-05-01

180

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

Directory of Open Access Journals (Sweden)

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, 1839, thus leading the authors to admit the synonymy of the two nominal species under the older name, P. acuta.

W Lobato Paraense

2003-06-01

 
 
 
 
181

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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, 1839, thus leading the authors to admit the synonymy of the two nominal species under the older name, P. acuta.

Lobato Paraense, W.; Jean-Pierre Pointier

2003-01-01

182

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english 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.

Paraense, W Lobato; Pointier, Jean-Pierre.

183

Morphological and molecular characterization of Neotropic Lymnaeidae (Gastropoda: Lymnaeoidea), vectors of fasciolosis.  

Science.gov (United States)

Lymnaeidae play a crucial role in the transmission of fasciolosis, a disease of medical and veterinary importance. In the Neotropic, a region where fasciolosis is emergent, eight Lymnaeidae species are currently considered valid. However, our knowledge of the diversity of this taxon is hindered by the fact that lymnaeids exhibit extremely homogeneous anatomical traits. Because most species are difficult to identify using classic taxonomy, it is difficult to establish an epidemiological risk map of fasciolosis in the Neotropic. In this paper, we contribute to our understanding of the diversity of lymnaeids in this region of the world. We perform conchological, anatomical and DNA-based analyses (phylogeny and barcoding) of almost all species of Lymnaeidae inhabiting the Neotropic to compare the reliability of classic taxonomy and DNA-based approaches, and to delimitate species boundaries. Our results demonstrate that while morphological traits are unable to separate phenotypically similar species, DNA-based approaches unambiguously ascribe individuals to one species or another. We demonstrate that a taxon found in Colombia and Venezuela (Galba sp.) is closely related yet sufficiently divergent from Galba truncatula, G. humilis, G. cousini, G. cubensis, G. neotropica and G. viatrix to be considered as a different species. In addition, barcode results suggest that G. cubensis, G. neotropica and G. viatrix might be conspecifics. We conclude that conchological and anatomical characters are uninformative to identify closely related species of Lymnaeidae and that DNA-based approaches should be preferred. PMID:21968212

Correa, Ana C; Escobar, Juan S; Noya, Oscar; Velásquez, Luz E; González-Ramírez, Carolina; Hurtrez-Boussès, Sylvie; Pointier, Jean-Pierre

2011-12-01

184

Transcriptome analysis in Concholepas concholepas (Gastropoda, Muricidae): mining and characterization of new genomic and molecular markers.  

Science.gov (United States)

The marine gastropod Concholepas concholepas, locally known as the "loco", is the main target species of the benthonic Chilean fisheries. Genetic and genomic tools are necessary to study the genome of this species in order to understand the molecular basis of its development, growth, and other key traits to improve the management strategies and to identify local adaptation to prevent loss of biodiversity. Here, we use pyrosequencing technologies to generate the first transcriptomic database from adult specimens of the loco. After trimming, a total of 140,756 Expressed Sequence Tag sequences were achieved. Clustering and assembly analysis identified 19,219 contigs and 105,435 singleton sequences. BlastN analysis showed a significant identity with Expressed Sequence Tags of different gastropod species available in public databases. Similarly, BlastX results showed that only 895 out of the total 124,654 had significant hits and may represent novel genes for marine gastropods. From this database, simple sequence repeat motifs were also identified and a total of 38 primer pairs were designed and tested to assess their potential as informative markers and to investigate their cross-species amplification in different related gastropod species. This dataset represents the first publicly available 454 data for a marine gastropod endemic to the southeastern Pacific coast, providing a valuable transcriptomic resource for future efforts of gene discovery and development of functional markers in other marine gastropods. PMID:21867972

Cárdenas, Leyla; Sánchez, Roland; Gomez, Daniela; Fuenzalida, Gonzalo; Gallardo-Escárate, Cristián; Tanguy, Arnaud

2011-09-01

185

A phylogeny for the pomatiopsidae (Gastropoda: Rissooidea): a resource for taxonomic, parasitological and biodiversity studies  

Science.gov (United States)

Background The Pomatiopsidae are reported from northern India into southern China and Southeast Asia, with two sub-families, the Pomatiopsinae (which include freshwater, amphibious, terrestrial and marine species) and the freshwater Triculinae. Both include species acting as intermediate host for species of the blood-fluke Schistosoma which cause a public health problem in East Asia. Also, with around 120 species, triculine biodiversity exceeds that of any other endemic freshwater molluscan fauna. Nevertheless, the origins of the Pomatiopsidae, the factors driving such a diverse radiation and aspects of their co-evolution with Schistosoma are not fully understood. Many taxonomic questions remain; there are problems identifying medically relevant species. The predicted range is mostly unsurveyed and the true biodiversity of the family is underestimated. Consequently, the aim of the study was to collect DNA-sequence data for as many pomatiopsid taxa as possible, as a first step in providing a resource for identification of epidemiologically significant species (by non-malacologists), for use in resolving taxonomic confusion and for testing phylogeographical hypotheses. Results The evolutionary radiation of the Triculinae was shown to have been rapid and mostly post late Miocene. Molecular dating indicated that the radiation of these snails was driven first by the uplift of the Himalaya and onset of a monsoon system, and then by late-Pliocene global warming. The status of Erhaia as Anmicolidae is supported. The genera Tricula and Neotricula are shown to be non-monophyletic and the tribe Jullieniini may be polyphyletic (based on convergent characters). Triculinae from northern Vietnam could be derived from Gammatricula of Fujian/Yunnan, China. Conclusions The molecular dates and phylogenetic estimates in this study are consistent with an Australasian origin for the Pomatiopsidae and an East to West radiation via Oligocene Borneo-Philippines island hopping to Japan and then China (Triculinae arising mid-Miocene in Southeast China), and less so with a triculine origin in Tibet. The lack of monophyly in the medically important genera and indications of taxonomic inaccuracies, call for further work to identify epidemiologically significant taxa (e.g., Halewisia may be potential hosts for Schistosoma mekongi) and highlight the need for surveys to determine the true biodiversity of the Triculinae.

2014-01-01

186

Biochemical profile of Biomphalaria glabrata (Mollusca: Gastropoda) after infection by Echinostoma paraensei (Trematoda: Echinostomatidae).  

Science.gov (United States)

The effect of infection by Echinostoma paraensei on the activity of the enzymes alanine aminotransferase (ALT) and aspartate aminotransferase (AST) and the concentration of total proteins, uric acid and urea in the hemolymph of Biomphalaria glabrata were investigated after exposure to five or 50 miracidia. The biochemical concentrations were measured weekly until the end of the fourth week after exposure. There was a significant decrease in the concentrations of total proteins in the snails exposed both to five and 50 miracidia, as well as an increase in the nitrogenous products of excretion, ALT and AST activities. The higher ALT activity in the hemolymph of the snails after infection with 50 miracidia suggests highest energetic requirement in these snails in relation to snails exposed to five miracidia. The results also suggest an increase in the use of total proteins, since there was increased formation of nitrogenous catabolites, in conformity with an increase in the aminotransferase activities, frequently associated with tissue damages. This can be explained by damage due to penetration by the miracidia and subsequent development of intramolluscan sporocysts and rediae. PMID:21537991

Tunholi, Victor M; Lustrino, Danilo; Tunholi-Alves, Vinícius M; Mello-Silva, Clélia C C; Maldonado, Arnaldo; Pinheiro, Jairo; Rodrigues, Maria de Lurdes de A

2011-09-01

187

The shallow-water New Caledonia Drilliidae of genus Clavus Montfort, 1810 (Mollusca: Gastropoda: Conoidea).  

Science.gov (United States)

Species of the genus Clavus of the conoidean family Drilliidae that occur in the littoral and shallow waters of New Caledonia are here revised. This study is based primarily on recent expedition material from the Institut de Recherche pour le Développement (New Caledonia) and Muséum National d'Histoire Naturelle (France). A total of 22 species is recorded, of which eight are described as new.        New species: Clavus boucheti, Clavus delphineae, Clavus virginieae, Clavus picoides, Clavus squamiferus, Clavus devexistriatus, Clavus hylikos, Clavus maestratii;        New synonyms: Tylotiella Habe, 1958 = Clavus; Clavus leforestieri Hervier, 1896 = Pleurotoma obliquicostata Reeve, 1845; Pleurotoma mariei Crosse, 1869 = Pleurotoma lamberti Montrouzier, 1860; Clavus mighelsi Kay, 1979, new name for Pleurotoma acuminata Mighels, 1845, non J. Sowerby, 1816, was misidentified by Kay 1979; the lectotype of P. acuminata Mighels, 1845, is mangeliine. Clavus mighelsi sensu Kay 1979, is a synonym of Pleurotoma humilis E. A. Smith, 1879. It is suggested that Pleurotoma pulchella Reeve, 1845, sometimes treated as an Indo-Pacific species, may be a senior synonym of Fenimorea halidorema Schwengel, 1940, from the tropical western Atlantic. Nomen dubium: Pleurotoma mediocris Deshayes, 1863.  PMID:24943803

Kilburn, Richard N; Fedosov, Alexander; Kantor, Yuri

2014-01-01

188

The cephalic sensory organ in veliger larvae of pulmonates (Gastropoda: Mollusca).  

Science.gov (United States)

The apical area of larvae of four primitive pulmonate species was investigated by means of serial ultrathin and light microscope sections. Cephalic sensory organs (CSOs) were found in the larvae of Onchidium cf. branchiferum (Onchidiidae) and Laemodonta octanfracta (Ellobiidae), while no trace of the organ was present in the larvae of Ovatella myosotis (Ellobiidae) or Williamia radiata (Siphonariidae). TEM investigation revealed very similar CSOs in O. cf. branchiferum and L. octanfracta, with characteristic putative sensory cell types: ampullary cells with an internal ampulla containing densely packed cilia, para-ampullary cells with external cilia parallel to the surface, and ciliary tuft cells, bearing short ciliary tufts. The epithelium covering the organ has a thick microvillar border with microvilli laterally bearing a pair of electron-dense accumulations and a glycocalyx with interspersed flat plaque-like elements. While homologues of all major elements of the CSO can be found in other gastropod taxa, for example caenogastropods and opisthobranchs, the homology of the ampullary cell with similar cells in nongastropods appears unlikely. The CSO of L. octanfracta is associated with an additional structure, an epithelial external protrusion, lying ventral to the CSO. The absence of the organ in W. radiata weakens hypotheses on the organ's function of examining settlement conditions and velar control. PMID:11746470

Ruthensteiner, Bernhard; Schaefer, Kurt

2002-01-01

189

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

Directory of Open Access Journals (Sweden)

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.

Alexandre Dias Pimenta

2012-10-01

190

Preliminary study of the terrestrial gastropods diversity (Gastropoda: Stylomatophora from Cefa Nature Park (NW of Romania  

Directory of Open Access Journals (Sweden)

Full Text Available The paper presents the first investigation over the terrestrial gastropods fauna from Cefa Nature Park (NW of Romania. The samples were collected every month (April 2009 - March 2010, using hand collection, soil collection from 25x25 cm squares which were processed in the laboratory through sieving as well as installation of Barber traps. On the whole, 22 species were determined (without slugs, of which dominant were the Holarctic species (31.82%, followed by the European elements (27.27%. The identified species belong to the following categories: mesophilous, hydrophilous and mesohydrophilous, with close percentages (27.27 % – 31.82 %. The least of the elements are those of mesoxerophilous (13.64%. The dams habitat between fishponds supports the largest diversity of terrestrial gastropods (21 species, followed by the forest one (9 species and finally the grasslands one (5 species. The species with the highest frequency (100% met during every month of investigations, was Vallonia pulchella, for the dams habitat between fishponds. All these results argues once more the importance and the need to protect these artificial habitats (like the dams between fishponds, which often undergo large anthrop pressures resulting from the piscicultural management (repeated setting on fire in order to stop the expansion of reed surfaces. It is also necessary to continue to investigate the gastropods fauna both in Cefa Nature Park, and in the protected area to which this park has common border and habitat (Körös-Maros National Park – Hungary.

Milca Petrovici

2011-06-01

191

ESR studies of {gamma}-irradiated Rapana venosa (Gastropoda, Muricidae) shell  

Energy Technology Data Exchange (ETDEWEB)

The unirradiated as well as {sup 60}Co {gamma}-ray irradiated up to 11.3kGy shells of veined Rapana Whelk (Rapana venosa), collected from the Black Sea coasts (Romania) were investigated by ESR technique. The radicals produced by {gamma}-irradiation in Rapana shell whose g-factors varied from 1.9976 to 2.0057 were attributed to CO{sub 2}{sup -}, CO{sub 3}{sup 3-}, CO{sub 3}{sup -}, and SO{sub 2}{sup -} species. The analysis of ESR spectra showed that the ESR signal intensity of all these radicals enhanced gradually with the increase of absorbed dose while the thermal treatment (100 deg. C) revealed an exponential decrease of the ESR amplitude with the annealing time for CO{sub 2}{sup -} and CO{sub 3}{sup 3-} free radicals.

Dana Seletchi, Emilia [Department of Atomic and Nuclear Physics, University of Bucharest, Magurele, P.O. Box, MG-11, RO-077125, Bucharest (Romania)]. E-mail: ed_seletchi@yahoo.com; Duliu, Octavian G. [Department of Atomic and Nuclear Physics, University of Bucharest, Magurele, P.O. Box, MG-11, RO-077125, Bucharest (Romania); Georgescu, Rodica [National Institute for Nuclear Physics and Engineering, Magurele, P.O. Box, MG-6, RO-077125, Bucharest (Romania)

2007-10-15

192

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english 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.

Alexandre Dias, Pimenta.

193

Darwininitium – a new fully pseudosigmurethrous orthurethran genus from Nepal (Gastropoda, Pulmonata, Cerastidae  

Directory of Open Access Journals (Sweden)

Full Text Available A new genus and species of pseudosigmurethrous orthurethran pulmonate of the family Cerastidae, Darwininitium shiwalikianum gen. n. and sp. n. is described from the Lesser Himalaya of Nepal. It represents the first record of an orthurethran with a fully developed pseudosigmurethrous pallial system,a completely closed secondary ureteric system. Biogeographically this new taxon provides a significant range extension for the family north of the previously known distribution range.

Prem Budha

2012-03-01

194

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

Directory of Open Access Journals (Sweden)

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.

Said Nouira

2011-12-01

195

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

Directory of Open Access Journals (Sweden)

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.

Marcos G. Papp

2001-03-01

196

Phylogenetic relationship and species identification within the Naticidae Guilding, 1834 (Gastropoda: Caenogastropoda)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Die vorliegende Arbeit handelt von der molekuaren Systematik, Phylogenie und Artenidentifikation der Naticidae und stellt die bisher umfassendste phylogenetische Analyse dieser Tiergruppe dar. Die molekulare Systematik dieser Tiergruppe unterscheidet sich deutlich von der traditioneller Klassifikationen, die überwiegend auf konvergent auftretenden schalenmorphologischen Merkmalen basieren. Die ermittelten Artengruppen widersprechen größtenteils den traditionellen Gattungskonzep...

Hu?lsken, Thomas

2008-01-01

197

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 mi...

Md. Moniruzzaman Sarker; Badrun Nesa; Md Sarwar Jahan

2007-01-01

198

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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) <...

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

2001-01-01

199

First records of the invasive slug Arion lusitanicus auct. non Mabille (Gastropoda: Pulmonata: Arionidae in Romania  

Directory of Open Access Journals (Sweden)

Full Text Available The invasive pest slug Arion lusitanicus (also known as Arion vulgaris has spread throughout much of Europe within the last 60 years, becoming one of the worst agricultural and horticultural pest species. It has now been detected in Romania for the first time. There are dense populations at two sites in Bra?ov County (2013 and another occurrence in Mure? County (2012. We review occurrences in neighbouring countries and discuss evidence that A. lusitanicus might have arrived in Romania earlier. Further research on the species’ spread in Romania and on its impact on the native fauna and flora is necessary.

Ana-Maria P?pureanu

2014-03-01

200

Structural diversity of NADPH diaphorase-reactive enteral networks in Stylommatophora (Gastropoda, Pulmonata)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In this work we investigated the involvement of putative nitric oxide (NO)-forming neurons in enteric plexuses of stylommatophoran gastropods. The nitric oxide synthase (NOS)-containing cells were detected by NADPH diaphorase (NADPHd) histochemistry in the entreral nervous systems of several stylommatophoran species (Achatinacea: Achatina fulica, Helicacea: Cepaea hortensis, Cepaea nemoralis, Discus rotundatus, Helicella obvia, Helix lucorum, Helix lutescens, Monachoides umbrosa, Trichia hisp...

R?szer Tamás (1979-) (orvos, tudományos munkatárs); Bánfalvi Gáspár (1943-) (biológus); Jenei Zsolt; Serf?z? Zoltán; Czimmerer Zsolt

2004-01-01

 
 
 
 
201

Monoamines in the pedal plexus of the land snail Megalobulimus oblongus (Gastropoda, Pulmonata  

Directory of Open Access Journals (Sweden)

Full Text Available In molluscs, the number of peripheral neurons far exceeds those found in the central nervous system. Although previous studies on the morphology of the peripheral nervous system exist, details of its organization remain unknown. Moreover, the foot of the terrestrial species has been studied less than that of the aquatic species. As this knowledge is essential for our experimental model, the pulmonate gastropod Megalobulimus oblongus, the aim of the present study was to investigate monoamines in the pedal plexus of this snail using two procedures: glyoxylic acid histofluorescence to identify monoaminergic structures, and the unlabeled antibody peroxidase anti-peroxidase method using antiserum to detect the serotonergic component of the plexus. Adult land snails weighing 48-80 g, obtained from the counties of Barra do Ribeiro and Charqueadas (RS, Brazil, were utilized. Monoaminergic fibers were detected throughout the pedal musculature. Blue fluorescence (catecholamines, probably dopamine was observed in nerve branches, pedal and subepithelial plexuses, and in the pedal muscle cells. Yellow fluorescence (serotonin was only observed in thick nerves and in muscle cells. However, when immunohistochemical methods were used, serotonergic fibers were detected in the pedal nerve branches, the pedal and subepithelial plexuses, the basal and lateral zones of the ventral integument epithelial cells, in the pedal ganglion neurons and beneath the ventral epithelium. These findings suggest catecholaminergic and serotonergic involvement in locomotion and modulation of both the pedal ganglion interneurons and sensory information. Knowledge of monoaminergic distribution in this snail´s foot is important for understanding the pharmacological control of reflexive responses and locomotive behavior.

Faccioni-Heuser M.C.

2004-01-01

202

Monoamines in the pedal plexus of the land snail Megalobulimus oblongus (Gastropoda, Pulmonata)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In molluscs, the number of peripheral neurons far exceeds those found in the central nervous system. Although previous studies on the morphology of the peripheral nervous system exist, details of its organization remain unknown. Moreover, the foot of the terrestrial species has been studied less than that of the aquatic species. As this knowledge is essential for our experimental model, the pulmonate gastropod Megalobulimus oblongus, the aim of the present study was to investigate monoamines ...

Faccioni-heuser, M. C.; Zancan, D. M.; Achaval, M.

2004-01-01

203

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english 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.

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

204

Two new species of Thaumastus (Gastropoda: Pulmonata: Orthalicidae: Bulimulinae) from the state of Minas Gerais, Brazil  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english Two new species of Thaumastus (Thaumastus) from the state of Minas Gerais, southeastern Brazil, are described. They are diagnosed and characterized by the morphology of the shell and soft parts and compared with Brazilian species of the subgenus Thaumastus s.s. Martens, 1860. Thaumastus (T.) parvus [...] sp. nov. is similar to T. (T.) baixoguanduensis Pena, Coelho & Salgado, 1996 but can be distinguished by the smaller size, smaller number of plates in the jaw, different number of follicle groups in the ovotestis and form of the fertilization complex. Thaumastus (T.) caetensis sp. nov. is similar to T. (T.) largillierti (Philippi, 1845) but differs by the width and the contour of the parietal side of the shell aperture. T. (T.) caetensis is also closer to Thaumastus (T.) baixoguanduensis but can be distinguished by the smaller dimensions (height, width and number of protoconch whorls), the lack of a transversal light band on the body whorl, the jaw with smaller number of plates, and the radula with 35 teeth. In the soft parts, this new species differs also in the number of follicle gatherings in ovotestis, fertilization complex with globose shape, and penian retractor muscle terminally and laterally attached to flagellum

Meire Silva, Pena; Norma Campos, Salgado; Arnaldo C. dos Santos, Coelho.

205

Description and classification of Late Triassic Neritimorpha (Gastropoda, Mollusca from the St Cassian Formation, Italian Alps  

Directory of Open Access Journals (Sweden)

Full Text Available Neritopsis represents the only surviving genus of an ancient group of the Neritimorpha that has no internal dissolution of its shell walls. While the two known living species have lecithotrophic early development without larval shell, Neritopsis aqabaensis n. sp. from the Gulf of Aqaba, Jordan, has a planktotrophic veliger. These living species of the genus differ in their protoconch shape as well as teleoconch morphology and ornament from the Triassic species that can be considered related to Neritopsis. Neritopsidae with the modern Neritopsinae is distinguished from the Triassic Cassianopsinae n. subfam. based on the genus Cassianopsis n. gen. with three species by features of their protoconch as well as the different characters of the operculum. Zardiniopsis n. gen. differs from these by higher shell shape and a smaller more complexly ornamented protoconch. Fossariopsis has a more angular shell shape. Colubrellopsinae n. subfam. with Colubrellopsis n. gen. resembles Cassianopsis n. gen. in respect to protoconch and features of the aperture of the teleoconch, but the former has rounded whorls and an ornament of axial ribs. Among the Fedaiellidae n. fam. with smooth shells two species of Fedaiella are redefined. The characters of the inner lip of their aperture connect them with the Neritopsidae, whereas the operculum in the Fedaiellidae with concentric structure on the outside distinguishes them from neritopsids.
In distinction to the groups of the Neritopsoidea members of the Dephinulopsidae have a smooth inner lip of the aperture. Here Delphinulopsinae and Platychilininae n. subfam. differ from each other in the shape and ornament of their teleoconch. Schwardtopsis n. gen. resembles a juvenile Delphinulopsis grown to a larger size. The large concave callus of the inner lip and almost open coiling defines Delphinulopsis. Rows of nodes, low initial shell and rapid growth in shell diameter to an almost limpet shape characterises Platychilina, and lamellar growth increments on an almost limpet-like shell with flat initial part is present in Marmolatella. The Palaeonaricidae n. fam. contains two species of Palaeonarica, which have a Nerita-like shell with simple aperture.
The Naticopsidae of the Carboniferous and Permian has its continuation in the Ampezzonaticopsinae n. subfam. of the Triassic, being connected to each other by the sinuous ornament of ribs on their larval shells. The genera are distinguished by teleoconch shape and differences in the ornament of their larval shell. Ampezzonaticopsis n. gen. has whorls well separated by deep sutures, Cortinaticopsis n. gen. has a simple aperture and a callus covering the umbilicus. The Hologyrinae n. subfam. with Hologyra have a ridge in the columellar furrow and an operculum that resembles that attributed to Carboniferous Naticopsis. Their protoconch has a characteristic chevron ornament on its larval whorls.

Bandel K

2007-09-01

206

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  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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% o...

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

207

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)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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.

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

208

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)

Full Text Available SciELO Chile | Language: Spanish Abstract in spanish 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.

Osorio, Cecilia.

209

Complexo Littorina ziczac (Gmelin (Mollusca, Gastropoda, Caenogastropoda no litoral fluminense: análise morfométrica, distribuição vertical e bioquímica The Littorina ziczac (Gmelin complex (Mollusca, Gastropoda, Caenogastropoda in the Rio de Janeiro coast: morphometric analysis, vertical distribution and biochemistry  

Directory of Open Access Journals (Sweden)

Full Text Available The Littorina ziczac (Gmelin, 1791 species complex was studied in Rio de Janeiro State, southeastern Brazil. The occurrence of three species was confirmed, through the analysis of penis morphology: L. ziczac (Gmelin, 1791, L. lineata d'Orbigny, 1841 and L. lineolata d'Orbigny, 1840. There is a correlation between the morphology of the penis and shell shape, thus it was possible to make a discrimination model based in conchologic data, with an efficiency of 75%. However, this model cannot be applied to others samples that weren't included in its formulation, due to phenotypic plasticity of the shell caused by biotic and abiotic factors. In the 9 areas studied L. lineolata was always the most abundam species. No vertical stratification in the distribution of the species was verified. From the nine enzymatic systems examined, only Pgi, Pgm e Mpi, presented identifiable patterns and no diagnostic locus was identified in any species. Nevertheless, S and I suggest the individualization of L. ziczac and L. lineata,respectively.

Ricardo Silva Absalão

1999-06-01

210

Complexo Littorina ziczac (Gmelin) (Mollusca, Gastropoda, Caenogastropoda) no litoral fluminense: análise morfométrica, distribuição vertical e bioquímica / The Littorina ziczac (Gmelin) complex (Mollusca, Gastropoda, Caenogastropoda) in the Rio de Janeiro coast: morphometric analysis, vertical distribution and biochemistry  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] Abstract in english The Littorina ziczac (Gmelin, 1791) species complex was studied in Rio de Janeiro State, southeastern Brazil. The occurrence of three species was confirmed, through the analysis of penis morphology: L. ziczac (Gmelin, 1791), L. lineata d'Orbigny, 1841 and L. lineolata d'Orbigny, 1840. There is a cor [...] relation between the morphology of the penis and shell shape, thus it was possible to make a discrimination model based in conchologic data, with an efficiency of 75%. However, this model cannot be applied to others samples that weren't included in its formulation, due to phenotypic plasticity of the shell caused by biotic and abiotic factors. In the 9 areas studied L. lineolata was always the most abundam species. No vertical stratification in the distribution of the species was verified. From the nine enzymatic systems examined, only Pgi, Pgm e Mpi, presented identifiable patterns and no diagnostic locus was identified in any species. Nevertheless, S and I suggest the individualization of L. ziczac and L. lineata,respectively.

Ricardo Silva, Absalão; Renata Alves Pinheiro, Roberg.

211

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)

Full Text Available SciELO Chile | Language: English Abstract in spanish 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

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

212

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  

Directory of Open Access Journals (Sweden)

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.

FS. Albuquerque

2008-11-01

213

Novo gastrópode fóssil da bacia de São José de Itaboraí, estado do Rio de Janeiro, Brasil (Mollusca, Gastropoda, Pulmonata, Endodontidae A new fossil gastropod from São José de Itaboraí basin, Rio de Janeiro State, Brazil (Mollusca, Gastropoda, Pulmonata, Endodontidae  

Directory of Open Access Journals (Sweden)

Full Text Available A new species of a very small land snail (Endodontidae occurring in São José de Itaboraí limestone basin, state of Rio de Janeiro, Brazil, is described in honour of zoologist Hugo de Souza Lopes. Austrodiscus Parodiz, 1957 is registered in the paleontological records, for the first time.

Cândido Simões Ferreira

1989-01-01

214

Comparative morphology of Astraea latispina (Philippi, 1844) and Astraea olfersii (Philippi, 1846) (Mollusca, Gastropoda, Turbinidae) / Morfologia comparada de Astraea latispina (Philippi, 1844) e Astraea olfersii (Philippi, 1846) (MOLLUSCA, GASTROPODA, TURBINIDAE)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese O presente estudo trata do exame comparativo das partes moles dos turbinídeos Astraea latispina e Astraea olfersii. Os caracteres das partes moles dessas espécies, concordantes com a organização dos Trochoidea, proporcionaram diagnose diferencial quanto aos lóbulos cefálicos, apêndice do pedúnculo o [...] cular, glândulas hipobranquiais, mandíbulas, rádulas e ceco espiral do estômago, fornecendo um número maior de dados que poderão auxiliar em estudos taxonômicos. Abstract in english The present study examines comparatively the soft parts of turbinids Astraea latispina and Astraea olfersii. The characters of soft parts of these species, in agreement with Trochoidea organization, allow a differencial diagnosis on the cefalic lappets, appendix of eye-stalk, hypobranchial glands, j [...] aws, radulae, and stomach spiral caecum, which information will be helpful in taxonomic studies.

J. C., MONTEIRO; A. C. S., COELHO.

215

Potentiality of Achatina fulica Bowdich, 1822 (Mollusca: Gastropoda) as intermediate host of the Angiostrongylus costaricensis Morera & Céspedes 1971 Achatina fulica Bowdich, 1822 (Mollusca: Gastropoda) como hospedeiro intermediário potencial do Angiostrongylus costaricensis Morera & Céspedes 1971  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Samples of Achatina fulica were experimentally infected with Angiostrongylus costaricensis larvae, etiological agent of abdominal angiostrongyliasis, showing that A. fulica is susceptible to the parasite. Achatina fulica may be a risk to urbanization of abdominal angiostrongyliasis presumably due to its high proliferation, continuous dispersion and remarkable adaptation in several Brazilian towns.Exemplares de Achatina fulica foram experimentalmente infectados com larvas de Angiostrongylu...

2003-01-01

216

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)

Full Text Available SciELO Chile | Language: English Abstract in spanish 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

FRANCISCO J, CÁDIZ; CARLOS S, GALLARDO.

217

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)

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

RUBÉN E. SOTO

2004-03-01

218

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)

Full Text Available SciELO Chile | Language: Spanish Abstract in spanish 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

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

219

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)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese 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.

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

220

Report on the ocurrence of Angiostrongylus costaricensis in southern Brazil, in a new intermediate host from the genus Sarasinula (Veronicellidae, Gastropoda) / Registro de Angiostrongylus costaricensis no sul do Brasil, em novo hospedeiro intermediário do gênero Sarasinula (Veronicellidae, Gastropoda)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese Lesmas veronicelídeas são os principais hospedeiros intermediários de Angiostrongylus costaricencis. Em uma localidade rural de Nova Itaberaba (SC, no sul do Brasil) Sarasinula linguaeformis apresenta-se como peste agrícola. O exame parasitológico das lesmas demonstrou infecção pelo A. costaricencis [...] em 43 de 50 animais. A prevalência de 86% e as cargas parasitárias são as mais altas registradas até o momento no Brasil e S. linguaeformis é a primeira espécie do gênero Sarasinula a ser identificado como hospedeiro intermediário do A. costaricencis no sul do país. Abstract in english Veronicellid slugs are the main intermediate hosts for Angiostrongylus costaricencis. In a rural locality in Nova Itaberaba (SC, southern Brazil) Sarasinula linguaeformis was identified as a crop pest. The parasitological examination revealed A. costaricencis infection in 43 out ot 50 slugs. The pre [...] valence of 86% and the individual parasitic burdens are the highest sofar reported in Brazil and S. linguaeformis is the first species from the genus Sarasinula to be identified as intermediate host for A. costaricencis in southern Brazil.

Antonio Carlo, Laitano; Júlia Pasquali, Genro; Ricardo, Fontoura; Susana Siqueira Lima, Branco; Rafael Lucyk, Maurer; Carlos, Graeff-Teixeira; José Maria, Milanez; Luís Antônio, Chiaradia; José Willibaldo, Thomé.

 
 
 
 
221

Analysis of the secondary structure of mitochondrial LSU rRNA of Peruvian land snails (Orthalicidae: Gastropoda) / Análisis de la estructura secundaria del LSU rRNA mitocondrial de caracoles terrestres peruanos (Orthalicidae: Gastropoda)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Peru | Language: English Abstract in spanish El alineamiento de genes ribosomales es dificultoso debido a eventos de inserción y deleción de nucleótidos, convirtiendo el alineamiento en ambiguo; esto puede ser superado utilizando la información de la estructura secundaria. El objetivo del presente trabajo es evaluar la utilidad de la estructur [...] a secundaria en mejorar el alineamiento del gen 16S rRNA de caracoles terrestres de la familia Orthalicidae. Se evaluaron 10 especies de Orthalicidos (5 géneros). El ADN total fue aislado y parte del gen 16S rRNA fue amplificado y secuenciado usando primers internos. Las secuencias fueron alineadas con ClustalX y corregidas a mano, en formato DCSE, usando la estructura secundaria del 16S rRNA de Albinaria caerulea (Pulmonata: Clausiliidae). Las secuencias obtenidas variaron de 323 a 345 pb correspondiendo a partes del dominio IV y V del gen 16S rRNA. Se pudo recuperar por homología la estructura secundaria para los Orthalicidos usando RnaViz 2.0. La mayoría de las hélices son conservadas, siendo en general los bucles más variables. El fenómeno de mutaciones compensatorias en las hélices, estaría relacionado con la conservación de la estructura. La ausencia de un "bulge-stem-loop" en el dominio V ubica a la familia Orthalicidae dentro de Heterobranchia. Abstract in english The alignment of ribosomal genes is difficult due to insertion and deletion events of nucleotides, making the alignment ambiguous. This can be overcome by using information from the secondary structure of ribosomal genes. The aim of this study was to evaluate the utility of the secondary structure i [...] n improving the alignment of the 16S rRNA gene in land snails of the family Orthalicidae. We assessed 10 Orthalicid species (five genera). Total DNA was isolated and the partial 16S rRNA gene was amplified and sequenced using internal primers. The sequences were aligned with ClustalX and manually corrected, in DCSE format, using the 16S rRNA secondary structure of Albinaria caerulea (Pulmonata: Clausiliidae). The sequences obtained ranged from 323 to 345 bp corresponding to parts of both domains IV and V of the 16S rRNA gene. The secondary structure was recovered by homology using RnaViz 2.0. Most stems are conserved, and in general the loops are more variable. The compensatory mutations in stems are related to maintenance of the structure. The absence of a bulge-stem-loop in domain V places the family Orthalicidae within the Heterobranchia.

Jorge, Ramirez; Rina, Ramírez.

222

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  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 cap...

Ca?diz, Francisco J.; Gallardo, Carlos S.

2007-01-01

223

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)

Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish 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.

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

2014-06-30

224

The population density effects on the reproductive biology of the snail Bradybaena similaris (Férussac, 1821) (Mollusca, Gastropoda) Efeitos da densidade populacional na biologia reprodutiva do molusco Bradybaena similaris (Molusca, Gastropoda)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The influence of population density on some aspects of the reproductive biology of the snail Bradybaena similaris was studied. Molluscs were maintained under 0.2 (isolated), 0.3, 0.6, 1.0, 1.3 and 1.7 snail/m² densities. The animals maintained under 0.3 and 0.6 snail/m² showed the lowest numbers of eggs laid/snail, being the highest value observed to the 1.7 snail/m². The hatching of the snails maintained under 0.3 snail/m² density, begun at the 21st day after laying, and the maximum time...

Cs, Oliveira; Mc, Vasconcellos; Pinheiro, J.

2008-01-01

225

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)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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.

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

226

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  

Directory of Open Access Journals (Sweden)

Full Text Available 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 different 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.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.

F. Rocha-Miranda

2006-11-01

227

The population density effects on the reproductive biology of the snail Bradybaena similaris (Férussac, 1821) (Mollusca, Gastropoda) / Efeitos da densidade populacional na biologia reprodutiva do molusco Bradybaena similaris (Molusca, Gastropoda)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese A influência da densidade populacional em alguns aspectos da biologia reprodutiva do molusco Bradybaena similaris foi estudada. Os moluscos foram mantidos em densidades de 0.2 (isolados), 0.3, 0.6, 1.0,1.3 e 1.7 moluscos/m². Nas densidades de 0.3 e 0.6 moluscos/m², os moluscos apresentaram os menore [...] s números de ovos postos por molusco, sendo o maior valor observado para essa variável na densidade de 1.7 molusco/m². A eclosão dos moluscos mantidos a uma densidade de 0.3 molusco/m², iniciou-se aos 21 dias após a postura, sendo o tempo máximo necessário para a eclosão 36 dias para ovos oriundos de moluscos mantidos nas densidades de 0.6, 1.0, 1.3 moluscos/m². O maior percentual de eclosão (55.56%) foi observado para os moluscos isolados. O conteúdo de galactogênio na glândula de albúmem parece não acompanhar as alterações na reprodução de B. similaris em resposta a diferentes densidades populacionais. Abstract in english The influence of population density on some aspects of the reproductive biology of the snail Bradybaena similaris was studied. Molluscs were maintained under 0.2 (isolated), 0.3, 0.6, 1.0, 1.3 and 1.7 snail/m² densities. The animals maintained under 0.3 and 0.6 snail/m² showed the lowest numbers of [...] eggs laid/snail, being the highest value observed to the 1.7 snail/m². The hatching of the snails maintained under 0.3 snail/m² density, begun at the 21st day after laying, and the maximum time required to the hatching was 36 days was observed to the eggs came from snails maintained under the densities 0.6, 1.0, 1.3 snail/m², respectively. The highest percentage hatchability (55.56%) was observed to isolated snails. The galactogen content in the albumen gland did not seem to accompany the alterations occurred in the reproduction of B. similaris in response to the different population densities.

Oliveira, CS. de; Vasconcellos, MC.; Pinheiro, J..

228

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)

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.

Eduardo Colley

2009-12-01

229

Report on the ocurrence of Angiostrongylus costaricensis in southern Brazil, in a new intermediate host from the genus Sarasinula (Veronicellidae, Gastropoda) Registro de Angiostrongylus costaricensis no sul do Brasil, em novo hospedeiro intermediário do gênero Sarasinula (Veronicellidae, Gastropoda)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Veronicellid slugs are the main intermediate hosts for Angiostrongylus costaricencis. In a rural locality in Nova Itaberaba (SC, southern Brazil) Sarasinula linguaeformis was identified as a crop pest. The parasitological examination revealed A. costaricencis infection in 43 out ot 50 slugs. The prevalence of 86% and the individual parasitic burdens are the highest sofar reported in Brazil and S. linguaeformis is the first species from the genus Sarasinula to be identified as intermediate hos...

Antonio Carlo Laitano; Júlia Pasquali Genro; Ricardo Fontoura; Susana Siqueira Lima Branco; Rafael Lucyk Maurer; Carlos Graeff-Teixeira; José Maria Milanez; Luís Antônio Chiaradia; José Willibaldo Thomé

2001-01-01

230

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  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 c...

2009-01-01

231

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  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

2004-01-01

232

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)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

2006-01-01

233

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  

Directory of Open Access Journals (Sweden)

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

MIRIAM FERNÁNDEZ

2006-06-01

234

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  

Directory of Open Access Journals (Sweden)

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.

JOSE MIGUEL ROJAS

2000-09-01

235

Primeiro registro de Antillorbis nordestensis (Lucena (Mollusca, Gastropoda, Planorbidae para a Ilha Grande, Angra dos Reis, Rio de Janeiro First record of Antillorbis nordestensis (Lucena (Mollusca, Gastropoda, Planorbidae to Ilha Grande, Angra dos Reis, Rio de Janeiro  

Directory of Open Access Journals (Sweden)

Full Text Available A malacological survey has been done by the sênior author in Ilha Grande, State of Rio de Janeiro, since 1996. Up to this date the only freshwater gastropods found were specimens of Antillorbis nordestensis (Lucena, 1954. The snails were collected at a swampy area situated behind the late Penal Colony Cândido Mendes (Ilha Grande Prison.

Sônia Barbosa dos Santos

1999-01-01

236

Role of temperature in the reproductive cycle of Thais chocolata (Gastropoda, Muricidae) in Chanavaya, Tarapacá, Chile / Rol de la temperatura en el ciclo reproductivo de Thais chocolata (Gastropoda, Muricidae) en Chanavaya, Tarapacá, Chile  

Scientific Electronic Library Online (English)

Full Text Available SciELO Chile | Language: English Abstract in spanish La condición reproductiva de Thais chocolata (establecimiento de agregación copulativa, postura de cápsulas y densidad de especímenes), se analizó mensualmente entre febrero de 2009 y enero de 2010, en la localidad de Chanavaya (Tarapacá, Chile). Los resultados, mostraron que los ejemplares se distr [...] ibuyen principalmente agregados, y que su desarrollo gonadal es asincrónico, con presencia de hembras maduras durante todo el año. Se encontraron agregaciones reproductivas en el estrato somero desde fines de enero hasta agosto de 2009, reapareciendo en enero de 2010. Sin embargo, las mayores magnitudes (que sustentaron su pesquería), ocurrieron durante junio-julio y enero. Se registró un incremento en la densidad de ejemplares en el estrato de 5 a 17 m de profundidad en mayo-agosto y diciembre-enero, coincidentes con aquellos en los que se desarrollaron las mayores agregaciones. Los períodos de agregaciones masivas, coincidieron con períodos de temperaturas mayores de 15°C, disminuyendo la actividad reproductiva con la temperatura. Se postula que variaciones bruscas de temperatura que ocurren en cortos periodos de tiempo, podrían causar que los especímenes maduros se desplacen, aumentando su densidad en aguas someras para reproducirse. Se sugiere proporcionar mayor protección al recurso durante su proceso de agregación reproductiva, dado que su extracción deja las posturas desprotegidas y propensas a la depredación por otros organismos. Abstract in english The reproductive condition of Thais chocolata (copulative aggregation establishment, clutch laying in capsules and specimen density), was studied monthly between February 2009 and January 2010, in the locality of Chanavaya (Tarapacá, Chile). Results showed that the specimens are mainly distributed i [...] n aggregations, and that their gonad development is asynchronous with the presence of mature females being registered during the entire year. Reproductive aggregations were found in the shallow stratus from late January to August 2009 and reappearing in January 2010. However, the larger ones (which sustained extraction) occurred during June-July and January. An increase in specimen density in the 5 to 17 m stratum was registered in May-August and December-January, coinciding with the periods previous to, during and after the highest aggregation magnitudes registered. The aggregation periods coincided with temperatures over 15°C, with a lower reproductive activity associated to a decrease in temperature. We state that abrupt temperature changes occurring in short time periods could cause mature specimen to move, increasing their density in shallow waters for reproductive purposes. We suggest increasing protection for the resource during the reproductive aggregation processes given that extraction leaves the clutches unprotected and prone to predation from other organisms.

Marcela, Cantillanez; Miguel, Avendaño.

237

Contribuição de Melampus coffeus (Gastropoda, Ellobiidae) na degradação da serapilheira do médio estuário do rio Pacoti, Ceará, Brasil / Contribution of Melampus coffeus (Gastropoda, Ellobiidae) to leaf litter decomposition in the middle estuary of the Pacoti river, Ceará, Brazil  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese A degradação da serapilheira no médio estuário do rio Pacoti foi estudada na presença e na ausência do gastrópode Melampus coffeus (Linnaeus, 1758), visando verificar a possível contribuição desse invertebrado na ciclagem da matéria orgânica dos manguezais. A densidade populacional de M. coffeus e a [...] distribuição das folhas, em termos de biomassa úmida, biomassa seca e abundância, presentes na serapilheira do local, foram estimadas a partir de uma amostragem. Um experimento em campo foi realizado com amostras de coloração e biomassas similares de folhas de Rhizophora mangle (Rhizophoraceae) sem sinais de herbivoria, distribuídas igualmente entre 64 gaiolas. Em 32 destas foram colocados também exemplares de M. coffeus. Essas gaiolas foram distribuídas entre quatro pontos, sendo oito pares de gaiolas (controle e experimento) por ponto. Durante oito semanas, quatro pares de gaiolas foram coletados semanalmente. Após coletadas, os sinais de pastagem nas folhas causados por M. coffeus foram contados e as biomassas úmida e seca das amostras foram determinadas. Comparando controle e experimento, verificou-se que M. coffeus é capaz de contribuir na degradação da serapilheira na área estudada, porém, não foi verificada uma participação significativa desse gastrópode na degradação das folhas quando comparados experimento e controle ao longo do experimento. Abstract in english The leaf litter decomposition in the middle estuary of the Pacoti river was studied in the presence and absence of the gastropod Melampus coffeus (Linnaeus, 1758), aiming at examining the contribution of this invertebrate to the organic matter cycling in mangroves ecosystems. The local population de [...] nsity of M. coffeus and leaf distribution based on wet biomass, dry biomass, and abundance, were estimated. A field experiment was conducted using samples of Rhizophora mangle (Rhizophoraceae) leaves (with similar color, and wet and dry biomass) equally distributed in 64 leaf litter cages. Groups of 14 individuals of M. coffeus were placed in 32 of these cages. The experimental cages were equally distributed with their respective control cages (leaves only) in the field among four points, totaling 64 cages. During eight weeks four pairs of cages (experimental and control) were collected weekly. Once collected, the leaves showing signs of grazing by M. coffeus were counted. The wet and dry biomasses of samples were also determined. Although M. coffeus can contribute to leaf litter degradation, in this study, its effect on leaf degradation was not significant when comparing experiment and control groups during the experimental time in the studied area.

Diva S, Tavares; Rafaela C, Maia; Cristina A, Rocha-Barreira.

238

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  

Directory of Open Access Journals (Sweden)

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 distribuição 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.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 mangrove 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.

Rafaela C. Maia

2007-12-01

239

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)

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.

Edilson Matos

1997-09-01

240

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)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] 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.

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

 
 
 
 
241

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)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] 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 (

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

242

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)

Full Text Available SciELO Chile | Language: Spanish Abstract in spanish 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.

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

243

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  

Directory of Open Access Journals (Sweden)

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.

C. A. ROCHA-BARREIRA

2002-11-01

244

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  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 ho...

Fs, Albuquerque; Mc, Peso-aguiar; Mjt, Assunc?a?o-albuquerque

2008-01-01

245

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  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

Rocha-barreira, C. A.

2002-01-01

246

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  

Directory of Open Access Journals (Sweden)

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

FRANCISCO J CÁDIZ

2007-03-01

247

MACROINVERTEBRATES COMPOSITION IN THE BLIZNEC STREAM, SECOND AND THIRD MAKSIMIR LAKE  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 import...

2004-01-01

248

Ribosomal DNA ITS-1 sequencing of Galba truncatula (Gastropoda, Lymnaeidae and its potential impact on fascioliasis transmission in Mendoza, Argentina  

Directory of Open Access Journals (Sweden)

Full Text Available Sequencing of the rDNA ITS-1 proved that the lymnaeid snail species Galba truncatula is present in Argentina and that it belongs to the haplotype HC, the same as that responsible for the fascioliasis transmission in the human hyperendemic area with the highest human prevalences and intensities known, the Northern Bolivian Altiplano.

P. Artigas

2006-01-01

249

DNA multigene sequencing of topotypic specimens of the fascioliasis vector Lymnaea diaphana and phylogenetic analysis of the genus Pectinidens (Gastropoda)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 human 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. diap...

2012-01-01

250

DNA multigene sequencing of topotypic specimens of the fascioliasis vector Lymnaea diaphana and phylogenetic analysis of the genus Pectinidens (Gastropoda  

Directory of Open Access Journals (Sweden)

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 human 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 (cox1 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.

Maria Dolores Bargues

2012-02-01

251

Ribosomal DNA ITS-1 sequencing of Galba truncatula (Gastropoda, Lymnaeidae) and its potential impact on fascioliasis transmission in Mendoza, Argentina  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Sequencing of the rDNA ITS-1 proved that the lymnaeid snail species Galba truncatula is present in Argentina and that it belongs to the haplotype HC, the same as that responsible for the fascioliasis transmission in the human hyperendemic area with the highest human prevalences and intensities known, the Northern Bolivian Altiplano.

2006-01-01

252

[Genetic and morphological variability of the gastropod mollusk Nucella heyseana (Mollusca, Gastropoda) in the environmental optimum and pessimum].  

Science.gov (United States)

Genotypic variability at six allozyme loci and six morphological shell characters was examined in 450 individuals (four samples) of mollusk Nucella heysana from the Vrangel' Bight (Nakhodka Bay) and the Vostok Bay (Peter the Great Gulf, Sea of Japan). An analysis of variation in allele frequencies showed that each of the two localities (Vostok and Nakhodka bays) in the analyzed region is inhabited by a single, albeit genetically heterogeneous, population. A canonical analysis and an analysis of variance of individual heterozygosity (Ho) and morphological variation indicate an association between Ho and morphological variation depending on habitat (interaction) in settlements in the Vrangel' Bight and, to a lesser extent, in the Vostok Bay. These results indicate that, in extreme environmental conditions, allozyme phenotypes may be selected either themselves or as markers of genes linked with them. PMID:11094745

Kartavtsev, Iu F; Rybnikova, I G; Sitnikov, A V; Amachaeva, E Iu; Svin'ina, O V

2000-10-01

253

Proterometra macrostoma (Trematoda: Azygiidae): location of the redia and emergence path from the snail, Elimia semicarinata (Gastropoda: Pleuroceridae).  

Science.gov (United States)

The objectives of this study were to describe (1) the osmotic environment and precise location of the Proterometra macrostoma redia in its snail intermediate host, (2) where retraction of the distome body into the cercarial tail occurs, and (3) the subsequent emergence path of the cercaria out of the snail. Snails, Elimia semicarinata , were collected from North Elkhorn Creek in Scott County, Kentucky and screened daily for patent infections. Live rediae were extracted from infected snails in either artificial pond water (APW) or artificial snail water (ASW) and monitored for changes in morphology and movement every hour over 5 hr at 22 C. Infected and control snails were simultaneously fixed and decalcified in Cal-Ex II, prepared for routine paraffin sectioning, and serial sections subsequently analyzed for rediae and cercariae location. Significantly (?(2) = 42.45; 1 df; P = 0.0001) more rediae showed movement in ASW than in APW after 5 hr, suggesting a host compartment separate from the mantle cavity. Histological sections clearly showed rediae developing in close association with the snail digestive tract, within the peri-intestinal sinus of the snail, and isolated from the mantle cavity by a mantle membrane. Retraction of the distome body into the cercarial tail follows the emergence of the cercaria from the redia. Cercariae then enter the mantle cavity and emerge into fresh water through a siphon-like structure formed by the mantle collar of the snail. PMID:23343411

Rosen, Ronald; Berg, Ericka; Dolan, Julianna; King, Bailey; Martin, Michon; Mehmeti, Franceska

2013-08-01

254

Description of a new species of the genus Arganiella Giusti & Pezzoli, 1980 (Mollusca, Gastropoda, Hydrobiidae) from the Iberian Peninsula  

Digital Repository Infrastructure Vision for European Research (DRIVER)

[EN] A new species of Arganiella Giusti & Pezzoli, 1980, up to now a monotypic genus, thought to be endemic to the Italian Central Apennines, is described from the Iberian Peninsula. This new species, named Arganiella tartessica, is located in southwestern Spain, provinces of Huelva and Badajoz. In this paper, a detailed description of its morphological characters is given and new data of nervous system and ciliated areas in the cephalic region are provided.

Arconada, B.; Ramos, M. A.

2007-01-01

255

Age, Growth, Mortality and Population Structure of Strombus canarium (Gastropoda: Strombidae: Variations in Male and Female Sub-Populations  

Directory of Open Access Journals (Sweden)

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.

Z.C. Cob

2009-01-01

256

Nouvelle localité de Valvata cristata (O.F. Müller, 1774 (Gastropoda, Heterobranchia,Valvatidae en Alsace (France, Bas-Rhin  

Directory of Open Access Journals (Sweden)

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.

Antoine Wagner

2012-01-01

257

Redécouverte de Pagodulina pagodula (Des Moulins, 1830 (Gastropoda, Orculidae dans le Puy-de-Dôme (Auvergne, France  

Directory of Open Access Journals (Sweden)

Full Text Available Pagodulina pagodula (Des Moulins, 1830 was cited from Puy-de-Dôme in 1851. This mention, regularly cited, had not been confirmed during the 20th century, and the species was considered extinct in Puy-de-Dôme. A recently discovered population, west of Clermont-Ferrand, was compared to topotypes from Dordogne and confirmed its occurrence in Puy-de-Dôme. The origin of the quotation of P. pagodula in the department was traced and the likely historical stations were identified. Field work confirmed the extant ocurrence of the species on these two stations. This paper provides an update of the distribution of P. pagodula in Puy-de-Dôme, with some observations on its habitats.

Laurent Charles

2012-01-01

258

Population structure and accompanying biota of the snail Turbo (Callopoma) funiculosus (Gastropoda: Turbinidae), on Socorro Island, Revillagigedo Archipelago, Mexico  

Scientific Electronic Library Online (English)

Full Text Available SciELO Costa Rica | Language: English Abstract in spanish El caracol porcelana, Turbo funiculosus, es un recurso pesquero potencial que casi no ha sido estudiado ni se ha utilizado comercialmente. En marzo de 1992, se realizó un muestreo de T. funiculosus en Bahía Binners y Bahía Blanca, isla Socorro, archipiélago Revillagigedo, empleando cuadrantes de 25 [...] m2. Se encontraron variaciones en la longitud total entre 3.0 y 85 mm, el peso proporcional entre 3.0 y 228 g, y la densidad entre 6.21 y 9.87 ind/m2. Los organismos de mayor tamaño (más de 50 mm) contienen 30.6 % de partes suaves. Las poblaciones del caracol porcelana siguen siendo inexplotadas en el archipiélago Revillagedo y podrían ser un recurso potencial de la industria pesquera bajo un adecuado plan de manejo. Abstract in english The porcelain snail, Turbo funiculosus, is a potential fishery resource that almost has not been studied or used commercially. In March of 1992, we sampled T. funiculosus in Bahía Binners and Bahía Blanca, Socorro Island, Revillagigedo Archipelago, using 25 m² quadrants. We found that total length v [...] aries between 3.0 and 85 mm, proportional weight between 3.0 and 228 g, and density between 6.21 and 9.87 ind/m². The largest organisms (over 50 mm) contain 30.6 % of soft parts. Porcelain snail populations remain unexploited on Revillagedo Archipelago and could be a potential resource under an adequate management strategy. Rev. Biol. Trop. 54 (4): 1079-1084. Epub 2006 Dec. 15.

Oscar E, Holguin Quiñones; Jesús E, Michel-Morfín.

259

Première mention de Pomatias elegans (O. F. Müller, 1774 (Gastropoda, Caenogastropoda, Pomatiidae au Nord de la Tunisie  

Directory of Open Access Journals (Sweden)

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.

Monia Ben Romdhane

2008-01-01

260

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)

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.

Henk K. Mienis

2010-01-01

 
 
 
 
261

Le genre Vertigo O.F. Müller, 1773 (Gastropoda, Stylommatophora, Vertiginidae en Normandie, premier état des connaissances  

Directory of Open Access Journals (Sweden)

Full Text Available According to the historical data on land molluscs in Normandy, three species belonging to the genus Vertigo were known in early XXth century: Vertigo pygmaea, V. antivertigo and V. moulinsiana. Nowadays, after five years of field surveys for a regional atlas project, three other species have been recorded: Vertigo angustior, V. pusilla and V. substriata; the former three are still present. V. pygmaea seems to be very common, occurring in a fairly wide variety of habitats, however V. antivertigo and V. substriata are restricted to damp environmental conditions but occur in scattered localities all over Normandy. V. pusilla, V. moulinsiana and V. angustior are rare and highly localised.

Pierre-Olivier Cochard

2006-01-01

262

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Costa Rica | Language: English Abstract in spanish 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.

Thompson, Fred G..

263

The South American radiation of Jerrybuccinum (Gastropoda, Buccinidae), with a new deep-water species from Chile  

Science.gov (United States)

Abstract 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 & Pastorino, 2009 and two still unnamed species from the Falkland Plateau.

Fraussen, Koen; Sellanes, Javier; Stahlschmidt, Peter

2014-01-01

264

Drusia (Escutiella alexantoni n. sp. (Gastropoda, Pulmonata, Parmacellidae, a new terrestrial slug from the Atlantic coast of Morocco  

Directory of Open Access Journals (Sweden)

Full Text Available We describe a new parmacellid, Drusia (Escutiella alexantoni n. sp. from the Moroccan Atlantic coast. The species most closely related to the new taxon are D. (E. deshayesii and D. (D. valenciennii. The new parmacellid differs from D. (E deshayesii mainly by the presence of external spots and bands on both the back and the shield, a reproductive system with uneven atrial appendices of the horn–shaped organ, and a different reticulated pattern of the inner epiphallus. It differs from D. (D. valenciennii mainly for the appearance of the shell and the pattern and disposition of the bumps inside the penis, the presence of an elbow–shape in this organ, and the reticulated appearance of the inner wall of the epiphallus. An updated dichotomous key of the family Parmacellidae is provided.

Borredà, V.

2013-01-01

265

Phylogeography and Genetic Differentiation among Populations of the Moon Turban Snail Lunella granulata Gmelin, 1791 (Gastropoda: Turbinidae)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 geograp...

Chiu, Yuh-wen; Bor, Hor; Tan, Mian-shin; Lin, Hung-du; Jean, Chuen-tan

2013-01-01

266

Phylogeography and Genetic Differentiation among Populations of the Moon Turban Snail Lunella granulata Gmelin, 1791 (Gastropoda: Turbinidae).  

Science.gov (United States)

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

Chiu, Yuh-Wen; Bor, Hor; Tan, Mian-Shin; Lin, Hung-Du; Jean, Chuen-Tan

2013-01-01

267

Phylogeography and Genetic Differentiation among Populations of the Moon Turban Snail Lunella granulata Gmelin, 1791 (Gastropoda: Turbinidae  

Directory of Open Access Journals (Sweden)

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.

Chuen-Tan Jean

2013-04-01

268

Population structure and accompanying biota of the snail Turbo (Callopoma funiculosus (Gastropoda: Turbinidae, on Socorro Island, Revillagigedo Archipelago, Mexico  

Directory of Open Access Journals (Sweden)

Full Text Available The porcelain snail, Turbo funiculosus, is a potential fishery resource that almost has not been studied or used commercially. In March of 1992, we sampled T. funiculosus in Bahía Binners and Bahía Blanca, Socorro Island, Revillagigedo Archipelago, using 25 m² quadrants. We found that total length varies between 3.0 and 85 mm, proportional weight between 3.0 and 228 g, and density between 6.21 and 9.87 ind/m². The largest organisms (over 50 mm contain 30.6 % of soft parts. Porcelain snail populations remain unexploited on Revillagedo Archipelago and could be a potential resource under an adequate management strategy. Rev. Biol. Trop. 54 (4: 1079-1084. Epub 2006 Dec. 15.El caracol porcelana, Turbo funiculosus, es un recurso pesquero potencial que casi no ha sido estudiado ni se ha utilizado comercialmente. En marzo de 1992, se realizó un muestreo de T. funiculosus en Bahía Binners y Bahía Blanca, isla Socorro, archipiélago Revillagigedo, empleando cuadrantes de 25 m2. Se encontraron variaciones en la longitud total entre 3.0 y 85 mm, el peso proporcional entre 3.0 y 228 g, y la densidad entre 6.21 y 9.87 ind/m2. Los organismos de mayor tamaño (más de 50 mm contienen 30.6 % de partes suaves. Las poblaciones del caracol porcelana siguen siendo inexplotadas en el archipiélago Revillagedo y podrían ser un recurso potencial de la industria pesquera bajo un adecuado plan de manejo.

Oscar E Holguin Quiñones

2006-12-01

269

Influence of joint application of heavy metals on level of each metal accumulated in the periwinkle Tympanotonus fuscatus (Gastropoda: Potamididae)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Most laboratory assessments of 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 fuscatu...

Otitoloju, A. A.; Don-pedro, K. N.

2006-01-01

270

Hemocyte-specific responses to the peroxidizing herbicide fomesafen in the pond snail Lymnaea stagnalis (Gastropoda, Pulmonata).  

Science.gov (United States)

Responses of circulating hemocytes were studied in Lymnaea stagnalis exposed to 10, 30, 90, and 270 microg/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. PMID:16930795

Russo, Jacqueline; Lefeuvre-Orfila, Luz; Lagadic, Laurent

2007-03-01

271

Myogenesis in Aplysia californica (Cooper, 1863) (Mollusca, Gastropoda, Opisthobranchia) with special focus on muscular remodeling during metamorphosis.  

Science.gov (United States)

To date only few comparative approaches tried to reconstruct the ontogeny of the musculature in invertebrates. This may be due to the difficulties involved in reconstructing three dimensionally arranged muscle systems by means of classical histological techniques combined with light or transmission electron microscopy. Within the scope of the present study we investigated the myogenesis of premetamorphic, metamorphic, and juvenile developmental stages of the anaspidean opisthobranch Aplysia californica using fluorescence F-actin-labeling in conjunction with modern confocal laser scanning microscopy. We categorized muscles with respect to their differentiation and degeneration and found three true larval muscles that differentiate during the embryonic and veliger phase and degenerate during or slightly after metamorphosis. These are the larval retractor, the accessory larval retractor, and the metapodial retractor muscle. While the pedal retractor muscle, some transversal mantle fibers and major portions of the cephalopedal musculature are continued and elaborated during juvenile and adult life, the buccal musculature and the anterior retractor muscle constitute juvenile/adult muscles which differentiate during or after metamorphosis. The metapodial retractor muscle has never been reported for any other gastropod taxon. Our findings indicate that the late veliger larva of A. californica shares some common traits with veligers of other gastropods, such as a larval retractor muscle. However, the postmetamorphic stages exhibit only few congruencies with other gastropod taxa investigated to date, which is probably due to common larval but different adult life styles within gastropods. Accordingly, this study provides further evidence for morphological plasticity in gastropod myogenesis and stresses the importance of ontogenetic approaches to understand adult conditions and life history patterns. PMID:18157859

Wollesen, Tim; Wanninger, Andreas; Klussmann-Kolb, Annette

2008-07-01

272

Focal benthic mollusks (Mollusca: Bivalvia and Gastropoda) of selected sites in Tubbataha Reef National Marine Park, Palawan, Philippines  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The study was conducted at Tubbataha Reef National Marine Park from May 6-11, 2005. Seven preestablished stations with survey sites at 5 and 10 m depth and one intertidal area were assessed using 150m permanent belt transects. Focal benthic mollusks found one meter to the left and right of transects wereidentified and counted. A total of 19 species belonging to eight families were recorded, of which 15species are univalves. In the intertidal area a total of 12 species were noted, 13 species a...

2005-01-01

273

Focal benthic mollusks (Mollusca: Bivalvia and Gastropoda of selected sites in Tubbataha Reef National Marine Park, Palawan, Philippines  

Directory of Open Access Journals (Sweden)

Full Text Available The study was conducted at Tubbataha Reef National Marine Park from May 6-11, 2005. Seven preestablished stations with survey sites at 5 and 10 m depth and one intertidal area were assessed using 150m permanent belt transects. Focal benthic mollusks found one meter to the left and right of transects wereidentified and counted. A total of 19 species belonging to eight families were recorded, of which 15species are univalves. In the intertidal area a total of 12 species were noted, 13 species at the shallow (5m and five species at deeper (10 m areas. Species belonging to the family Tridacnidae and Trochidaewere the most abundant. Among the subtidal stations, the highest number of individuals was noted at ashallow reef flat (station VI. In terms of density, the intertidal area had the highest (213,310 ind. km-2followed by the shallow (72,870 ind. km-2 and the deep with 5,720 ind. km-2.The densities of Tridacna crocea (133,330 ind. km-2 and Hippopus hippopus (3,330 ind. km-2 at theintertidal area were found to be higher than in most other survey sites in Palawan but previous densityrecords at the park indicate a stiff decline. On the contrary, the first record on the density of T. squamosa(950 ind. km-2 at the park is much lower compared to that from other parts of Palawan. Large andcommercially valuable gastropods like, Trochus niloticus, Tectus maculatus and T. pyramis that are rarelyencountered at the intertidal areas were abundant at the TRNMP. Other important species like Tridacnagigas, Charonia tritonis and Cassis cornuta were not encountered at the study sites. To fully assess theabundance of focal mollusks, permanent transects should be established in the same seven sites but inshallow reef flat of about 2 m deep, in the lagoon and in the intertidal of North and South Islets wherespecies composition, density and growth could be monitored on an annual basis which could be used toevaluate the management effectiveness at the TRNMP.

Roger G. Dolorosa

2005-12-01

274

Biochemical Change at the Setting-up of the Crossed-Lamellar Layer in Nerita undata Shell (Mollusca, Gastropoda  

Directory of Open Access Journals (Sweden)

Full Text Available Nerita undata is a marine gastropod, the shell of which consists of an external layer composed of very fine, long and undulating calcite prisms, and of an internal aragonite crossed-lamellar layer. As for any Ca-carbonate shell, both layers are composite materials, resulting from the  sub-micrometric association of organic macromolecules with the mineral phase. But at the transition between the two layers, in situ synchrotron-based mapping using ?-XANES spectroscopy performed at the S K-edge and SR-FTIR spectroscopy reveals that biochemical compositions change correlatively with the mineral phase, such as displayed by the distribution of sulfur-containing organic compounds (S-polysaccharides or S-amino acids and organic molecular groups (amide I and II bands. These results highlight the complex change of secretory activity operated by the mineralizing tissue (the mollusk mantle between these two parts of the shell, which is suspected to minutely control the setting-up of the crossed-lamellar microstructural pattern over the calcite prisms—A not so straightforward feature.

Julius Nouet

2012-03-01

275

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)

2006-09-01

276

Influence of joint application of heavy metals on level of each metal accumulated in the periwinkle Tympanotonus fuscatus (Gastropoda: Potamididae  

Directory of Open Access Journals (Sweden)

Full Text Available Most laboratory assessments of 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 ion 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 ratio 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. Rev. Biol. Trop. 54 (3: 803-814. Epub 2006 Sept. 29.La mayoría de los análisis de laboratorio sobre toxicidad y bioacumulación de metales pesados se han concentrado en la acumulación individual de los iones metálicos en los organismos de prueba expuestos a ellos. Sin embargo, bajo condiciones naturales del ambiente, los metales nunca se presentan en forma aislada y deben interactuar unos con otros, justificando así la necesidad de estudiar el efecto de la aplicación conjunta de metales en animales de prueba. En este estudio la exposición de Tympanotonus fuscatus a concentraciones subletales (0.1-0.01 de 96 h LC50 de metales pesados reveló que la bioacumulación varía según el tipo de metal, el período de exposición y la concentración en el medio de prueba. Mientras los iones de Zn y Pb incrementaron gradualmente su acumulación al pasar el tiempo, las cantidades de Cu fluctuaron regularmente durante los 30 días del experimento. Los niveles de Zn, Cu y Cd bioacumulados durante los 30 días del experimento son de dos a seis veces menores (con un rango de bioacumulación de 0.15-0.81 que los que se obtienen por la exposición a los metales en forma individual. Por el contrario, la acumulación de Pb aumentó al doble (rango de bioacumulación 1.36-2.0.

A.A Otitoloju

2006-09-01

277

Influence of joint application of heavy metals on level of each metal accumulated in the periwinkle Tympanotonus fuscatus (Gastropoda: Potamididae)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Costa Rica | Language: English Abstract in spanish La mayoría de los análisis de laboratorio sobre toxicidad y bioacumulación de metales pesados se han concentrado en la acumulación individual de los iones metálicos en los organismos de prueba expuestos a ellos. Sin embargo, bajo condiciones naturales del ambiente, los metales nunca se presentan en [...] forma aislada y deben interactuar unos con otros, justificando así la necesidad de estudiar el efecto de la aplicación conjunta de metales en animales de prueba. En este estudio la exposición de Tympanotonus fuscatus a concentraciones subletales (0.1-0.01 de 96 h LC50) de metales pesados reveló que la bioacumulación varía según el tipo de metal, el período de exposición y la concentración en el medio de prueba. Mientras los iones de Zn y Pb incrementaron gradualmente su acumulación al pasar el tiempo, las cantidades de Cu fluctuaron regularmente durante los 30 días del experimento. Los niveles de Zn, Cu y Cd bioacumulados durante los 30 días del experimento son de dos a seis veces menores (con un rango de bioacumulación de 0.15-0.81) que los que se obtienen por la exposición a los metales en forma individual. Por el contrario, la acumulación de Pb aumentó al doble (rango de bioacumulación 1.36-2.0). Abstract in english Most laboratory assessments of 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 eac [...] h 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 ion 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 ratio 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). Rev. Biol. Trop. 54 (3): 803-814. Epub 2006 Sept. 29.

A.A, Otitoloju; K.N, Don-Pedro.

278

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)

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

Jasna Puizina

2013-08-01

279

Mitochondrial DNA phylogeography of Semisulcospira libertina (Gastropoda: Cerithioidea: Pleuroceridae): implications the history of landform changes in Taiwan.  

Science.gov (United States)

The mitochondrial DNA cytochrome c oxidase subunit I sequences from 95 specimens of Semisulcospira libertina in Taiwan were identified as two major phylogroups, exhibiting a southern and northern distribution, north of Formosa Bank and south of Miaoli Plateau. The genetic distance between these two phylogroups was 12.20%, and the distances within-phylogroups were 4.97 and 5.56%. According to a molecular clock of 1.56% per lineage per million years, the divergence time between these two major phylogroups was estimated at 4.94 million years ago (mya), with the two phylogroups forming at 3.64 and 3.75 mya, respectively. Moreover, the geological events have suggested that Taiwan Island emerged above sea level at 4-5 mya, and became its present shape at 2 mya. These results suggested that these two phylogroups might originate from two independent ancestral populations or divergent before colonizing Taiwan. Within South phylogroup, the initial colonization was hypothesized to be in Kaoping River (WT), followed by its northward. The high divergence between south- and north of WT River was influenced by the formation of the Kaoping foreland basins. Within North phylogroup, the colonization was from central sub-region through paleo-Miaoli Plateau to northern and northeastern sub-regions. This study showed that the landform changes might have shaped the genetic structure of S. libertina in concert. Apparently, two cryptic species or five different genetic stocks of S. libertina could be identified; these results are useful for the evaluation and conservation of S. libertina in Taiwan. PMID:24584517

Hsu, Kui-Ching; Bor, Hor; Lin, Hung-Du; Kuo, Po-Hsun; Tan, Mian-Shin; Chiu, Yuh-Wen

2014-06-01

280

Potentiality of Achatina fulica Bowdich, 1822 (Mollusca: Gastropoda) as intermediate host of the Angiostrongylus costaricensis Morera & Céspedes 1971  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Samples of Achatina fulica were experimentally infected with Angiostrongylus costaricensis larvae, etiological agent of abdominal angiostrongyliasis, showing that A. fulica is susceptible to the parasite. Achatina fulica may be a risk to urbanization of abdominal angiostrongyliasis presumably due to its high proliferation, continuous dispersion and remarkable adaptation in several Brazilian towns.

2003-01-01

 
 
 
 
281

Natural infection of Deroceras laeve (Mollusca: gastropoda with metastrongylid larvae in a transmission focus of abdominal angiostrongyliasis  

Directory of Open Access Journals (Sweden)

Full Text Available Angiostrongylus costaricensis is a nematode parasitic of rodents. Man may become infected by ingestion of the third stage larvae produced within the intermediate hosts, usually slugs from the family Veronicellidae. An epidemiological study carried out in a locality in southern Brazil (western Santa Catarina State where these slugs are a crop pest and an important vector for A. costaricensis has documented for the first time the natural infection of Deroceras laeve with metastrongylid larvae. This small limacid slug is frequently found amid the folds of vegetable leaves and may be inadvertently ingested. Therefore D. laeve may have an important role in transmission of A. costaricensis to man.

MAURER Rafael Lucyk

2002-01-01

282

On the taxonomical identity of some taxa of the Iberian endemic genus Iberus Montfort, 1810 (Gastropoda, Helicidae  

Directory of Open Access Journals (Sweden)

Full Text Available To determine the taxonomic identity of some of the species included in the genus Iberus, we reviewed the type series described by Rossmässler (1854 and deposited at the Senckenberg Forschungsinstitut und Naturmuseum of Frankfurt (Germany. We concluded that Helix alcarazana (currently Iberus alcarazanus is a junior synonym of Iberus alonensis (Férussac, 1821. The type localities of Helix guiraoana and Helix alcarazana were discussed and modified and the lectotypes of Helix guiraoana, Helix guiraoana var. angustata, Helix alcarazana and Helix loxana were designated. In addition, we reviewed the type series of Helix alonensis Férussac, 1821 (currently Iberus alonensis deposited at the Muséum national d’Histoire naturelle of Paris, France and we selected its lectotype. The locality of Alicante has been designated as the restricted type locality of this species.

Martínez–Ortí, A.

2012-01-01

283

Metamorphosis Induction of the Dog Conch Strombus canarium (Gastropoda: Strombidae Using Cues Associated with Conch Nursery Habitat  

Directory of Open Access Journals (Sweden)

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.

Z.C. Cob

2010-01-01

284

Significant population genetic structure of the Cameroonian fresh water snail, Bulinus globosus, (Gastropoda: Planorbidae) revealed by nuclear microsatellite loci analysis.  

Science.gov (United States)

In order to characterize the demographic traits and spatial structure of Cameroonians Bulinus globosus, intermediate host of Schistosoma haematobium, genetic structure of seven different populations, collected from the tropical zone, was studied using six polymorphic microsatellites. Intrapopulation genetic diversity ranged from 0.37 to 0.55. Interpopulation genetic diversity variation clearly illustrated their significant isolation due to distance with gene flow substantially limited to neighbouring populations. The effective population sizes (Ne) were relatively low (from 3.0 to 18.6), which supposes a high rate from which populations would lose their genetic diversity by drift. Analysis of genetic temporal variability indicated fluctuations of allelic frequencies (35 of 42 locus-population combinations, Pgenetic drift and gene flow are the main factors shaping the genetic structure of studied populations. PMID:24751417

Djuikwo-Teukeng, F F; Da Silva, A; Njiokou, F; Kamgang, B; Ekobo, A Same; Dreyfuss, G

2014-09-01

285

Conservational status and demographic characteristics of Patella ferruginea Gmelin, 1791 (Mollusca, Gastropoda on the Alboran Island (Western Mediterranean  

Directory of Open Access Journals (Sweden)

Full Text Available Due to the high risk of the global extinction in which Patella ferruginea Gmelin, 1791 is found, it is considered of great interest to describe and quantify its demographic characteristics in those sites where it still persists, as well as to evaluate the reasons which have led this limpet to be one of the most threatened marine species in the Mediterranean Sea. Over the study period (2000-2002, systematic census were made on the perimeter of the Alboran Island (Alboran Sea, westernmost area of the Mediterranean Sea with the object to quantify the abundance of the species in the locality, as well as their external biometry and spatial distribution. As a result, the presence of a probable reproductive population of P. ferruginea was found on the island. The negative effect provoked by the continuous presence of man was proved, prejudicing the population in those zones which were more accessible for their harvesting. For this reason, it is necessary to regulate the use of the natural resources of the island to favour the conservation and spontaneous recolonisation of the zone by P. ferruginea.

Moreno, D.

2003-01-01

286

Natural infection of deroceras laeve (Mollusca: gastropoda) with metastronbylid larvae in a transmission focus of abdominal angiostrongyliasis.  

Science.gov (United States)

Angiostrongylus costaricensis is a nematode parasitic of rodents. Man may become infected by ingestion of the third stage larvae produced within the intermediate hosts, usually slugs from the family Veronicellidae. An epidemiological study carried out in a locality in southern Brazil (western Santa Catarina State) where these slugs are a crop pest and an important vector for A. costaricensis has documented for the first time the natural infection of Deroceras laeve with metastrongylid larvae. This small limacid slug is frequently found amid the folds of vegetable leaves and may be inadvertently ingested. Therefore D. laeve may have an important role in transmission of A. costaricensis to man. PMID:11896413

Maurer, Rafael Lucyk; Graeff-Teixeira, Carlos; Thome, José Willibaldo; Chiaradia, Luís Antônio; Sugaya, Hiroko; Yoshimura, Kentaro

2002-01-01

287

Distribution, feeding behavior and control strategies of the exotic land snail Achatina fulica (Gastropoda: Pulmonata) in the northeast of Brazil.  

Science.gov (United States)

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

Albuquerque, F S; Peso-Aguiar, M C; Assunção-Albuquerque, M J T

2008-11-01

288

Thais (Stramonita) rustica (Lamarck, 1822) (Mollusca: Gastropoda: Thaididae), a potential bioindicator of contamination by organotin northeast Brazil  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

Ítalo Braga de Castro; Meirelles, Carlos A. O.; Helena Matthews-Cascon; Marcos Antonio Fernandez

2004-01-01

289

Thais (Stramonita) rustica (Lamarck, 1822) (Mollusca: Gastropoda: Thaididae), a potential bioindicator of contamination by organotin northeast Brazil  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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.

Castro, Ítalo Braga de; Meirelles, Carlos A. O.; Matthews-Cascon, Helena; Fernandez, Marcos Antonio.

290

Thais (Stramonita rustica (Lamarck, 1822 (Mollusca: Gastropoda: Thaididae, a potential bioindicator of contamination by organotin northeast Brazil  

Directory of Open Access Journals (Sweden)

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.

Ítalo Braga de Castro

2004-06-01

291

Systematics and evolution of the Acochlidia (Gastropoda, Euthyneura) - a microanatomical approach by means of 3D reconstruction using Amira  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

Neusser, Timea Pamela

2012-01-01

292

Opisthobranchia (Mollusca, Gastropoda) – more than just slimy slugs. Shell reduction and its implications on defence and foraging  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Abstract Background In general shell-less slugs are considered to be slimy animals with a rather dull appearance and a pest to garden plants. But marine slugs usually are beautifully coloured animals belonging to the less-known Opisthobranchia. They are characterized by a large array of interesting biological phenomena, usually related to foraging and/or defence. In this paper our knowledge of shell reduction, correlated with the evolution of different defensive and foraging ...

Wägele Heike; Klussmann-Kolb Annette

2005-01-01

293

mtDNA ribosomal gene phylogeny of sea hares in the genus Aplysia (Gastropoda, Opisthobranchia, Anaspidea): Implications for comparative neurobiology  

Energy Technology Data Exchange (ETDEWEB)

Sea hares within the genus Aplysia are important neurobiological model organisms, and as studies based on different Aplysia species appear in the literature, a phylogenetic framework has become essential. We present a phylogenetic hypothesis for this genus, based on portions of two mitochondrial genes (12S and 16S). In addition, we reconstruct the evolution of several behavioral characters of interest to neurobiologists in order to illustrate the potential benefits of a phylogeny for the genus Aplysia. These benefits include the determination of ancestral traits, the direction and timing of evolution of characters, prediction of the distribution of traits, and identification of cases of independent acquisition of traits within lineages. This last benefit may prove especially useful in understanding the linkage between behaviors and their underlying neurological basis.

Medina, Monica; Collins, Timothy M.; Walsh, Patrick J.

2000-08-10

294

Opisthobranchia (Mollusca, Gastropoda – more than just slimy slugs. Shell reduction and its implications on defence and foraging  

Directory of Open Access Journals (Sweden)

Full Text Available Abstract Background In general shell-less slugs are considered to be slimy animals with a rather dull appearance and a pest to garden plants. But marine slugs usually are beautifully coloured animals belonging to the less-known Opisthobranchia. They are characterized by a large array of interesting biological phenomena, usually related to foraging and/or defence. In this paper our knowledge of shell reduction, correlated with the evolution of different defensive and foraging strategies is reviewed, and new results on histology of different glandular systems are included. Results Based on a phylogeny obtained by morphological and histological data, the parallel reduction of the shell within the different groups is outlined. Major food sources are given and glandular structures are described as possible defensive structures in the external epithelia, and as internal glands. Conclusion According to phylogenetic analyses, the reduction of the shell correlates with the evolution of defensive strategies. Many different kinds of defence structures, like cleptocnides, mantle dermal formations (MDFs, and acid glands, are only present in shell-less slugs. In several cases, it is not clear whether the defensive devices were a prerequisite for the reduction of the shell, or reduction occurred before. Reduction of the shell and acquisition of different defensive structures had an implication on exploration of new food sources and therefore likely enhanced adaptive radiation of several groups.

Wägele Heike

2005-02-01

295

New records of Omalonyx matheroni (Pontiez & Michaud, 1835 (Mollusca, Gastropoda, Succineidae for the São Paulo and Paraná States.  

Directory of Open Access Journals (Sweden)

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.

Maria Cristina Dreher Mansur

2009-06-01

296

Copper in Helix pomatia (Gastropoda) is regulated by one single cell type: differently responsive metal pools in rhogocytes.  

Science.gov (United States)

Like all other animal species, terrestrial pulmonate snails require Cu as an essential trace element. On the other hand, elevated amounts of Cu can exert toxic effects on snails. The homeostatic regulation of Cu must therefore be a pivotal goal of terrestrial pulmonates to survive. Upon administration of Cu, snails accumulate the metal nearly equally in most of their organs. Quantitative studies in connection with HPLC and electrospray ionization mass spectrometry reveal that a certain fraction of Cu in snails is bound to a Cu-metallothionein (Cu-MT) isoform that occurs in most organs at constant concentrations, irrespective of whether the animals had been exposed to physiological or elevated amounts of Cu. In situ hybridization demonstrates that at the cellular level, the Cu-binding MT isoform is exclusively expressed in the so-called pore cells (or rhogocytes), which can be found in all major snail organs. The number of pore cells with Cu-MT mRNA reaction products remains unaffected by Cu exposure. Rhogocytes also are major storage sites of Cu in a granular form, the metal quickly entering the snail tissues upon elevated exposure. The number of rhogocytes with granular Cu precipitations strongly increases upon Cu administration via food. Thus, whereas Cu-MT in the rhogocytes represents a stable pool of Cu that apparently serves physiological tasks, the granular Cu precipitations form a second, quickly inducible, and more easily available pool of the metal that serves Cu regulation by responding to superphysiological metal exposure. PMID:15905226

Dallinger, Reinhard; Chabicovsky, Monika; Hödl, Elisabeth; Prem, Caroline; Hunziker, Peter; Manzl, Claudia

2005-10-01

297

Heavy metals in Patella caerulea (Mollusca, Gastropoda) in polluted and non-polluted areas from the Iskenderun Gulf (Mediterranean Turkey).  

Science.gov (United States)

The concentrations of Cd, Cu, Zn, Fe, Pb, Ni, and Co were measured in gastropod mollusks Patella caerulea in the Mediterranean area. The organisms were collected at two coastal sites in Iskenderun Gulf during winter, spring, summer, and autumn 2008. Samples of the digestive gland, gill, and muscle were analyzed for heavy metals. The aim of study is to determine heavy metal levels in tissues of P. caerulea in different locations. Tissues of P. caerulea from the polluted site showed metal concentrations appreciably higher than unpolluted organisms. The highest metal levels were registered in the digestive gland of P. caerulea. Generally, digestive gland and gills showed higher metal concentrations than muscle. The average concentrations of heavy metals analyzed exhibited the following decreasing order: Fe>Zn>Cu>Ni>Cd>Pb>Co for both stations 1 and 2. Seasonal changes in metal concentrations were observed in the tissues of P. caerulea from a polluted and an unpolluted population. PMID:19543988

Yüzerero?lu, T A; Gök, G; Co?un, H Y; Firat, O; Aslanyavrusu, Sabahattin; Maruldali, Onur; Kargin, F

2010-08-01

298

A new species of Haplosporidium Caullery & Mesnil, 1899 in the marine false limpet Siphonaria lessonii (Gastropoda: Siphonariidae) from Patagonia.  

Science.gov (United States)

A new species of Haplosporidium Caullery & Mesnil, 1899 parasitising the pulmonate gastropod Siphonaria lessonii Blainville in Patagonia, Argentina, is described based on morphological (scanning and transmission electron microscopy) and sequence (small subunit ribosomal RNA gene) data. Different stages of sporulation were observed as infections disseminated in the digestive gland. Haplosporidium patagon n. sp. is characterised by oval or slightly subquadrate spores with an operculum that is ornamented with numerous short digitiform projections of regular height, perpendicular to and covering its outer surface. The operculum diameter is slightly larger than the apical diameter of the spore. Neither the immature nor mature spores showed any kind of projections of the exosporoplasm or of the spore wall. Regarding phylogenetic affinities, the new species was recovered as sister to an undescribed species of Haplosporidium Caullery & Mesnil, 1899 from the polychaete family Syllidae Grube from Japanese waters. The morphological characters (ornamentation of the operculum, spore wall structure, shape and size of spores, and the lack of spore wall projections) corroborate it as an as yet undescribed species of Haplosporidium and the first for the phylum in marine gastropods of South America. Siphonaria lessonii is the only known host to date. PMID:24711113

Ituarte, Cristián; Bagnato, Estefanía; Siddall, Mark; Cremonte, Florencia

2014-05-01

299

Opisthobranchs from the western Indian Ocean, with descriptions of two new species and ten new records (Mollusca, Gastropoda)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

Yonow, Nathalie

2012-01-01

300

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)

Full Text Available SciELO Brazil | Language: English Abstract in english 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.

Maria Dolores, Bargues; Roberto Luis, Mera y Sierra; Patricio, Artigas; Santiago, Mas-Coma.

 
 
 
 
301

Actualización del conocimiento de la distribución de la Superfamilia Vitrinoidea Fitzinger, 1833 (Gastropoda, Pulmonata en el oeste de Galicia  

Directory of Open Access Journals (Sweden)

Full Text Available A faunistic study of species of Superfamily Vitrinoidea Fitzinger, 1833, in the west of Galicia (A Coruña and Pontevedra provinces has been realized. For each species the previous cite and the localities where the species have been found, are included, as well as a map showing the distribution of each species, using U.T.M. 10 x 10 km system. We corroborate the presence of Aegopinella pura (Alder, 1830 in the study area and Oxychilus glaber (Rossmässler, 1835 is recorded for first time from Pontevedra province.

En este trabajo se realiza un estudio faunístico de las especies de la Superfamilia Vitrinoidea Fitzinger, 1833, encontradas en el oeste de Galicia (provincias de A Coruña y Pontevedra. Para cada especie se incluyen citas previas y localidades de captura, así como sus respectivos mapas de distribución, en cuadrículas 10 x 10 km U.T.M. Se constata la presencia de Aegopinella pura (Alder, 1830 en el área de estudio y se cita por primera vez Oxychilus glaber (Rossmässler, 1835 en la provincia de Pontevedra.

Ondina, P.

1995-12-01

302

Population structure and accompanying biota of the snail Turbo (Callopoma) funiculosus (Gastropoda: Turbinidae), on Socorro Island, Revillagigedo Archipelago, Mexico  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The porcelain snail, Turbo funiculosus, is a potential fishery resource that almost has not been studied or used commercially. In March of 1992, we sampled T. funiculosus in Bahía Binners and Bahía Blanca, Socorro Island, Revillagigedo Archipelago, using 25 m² quadrants. We found that total length varies between 3.0 and 85 mm, proportional weight between 3.0 and 228 g, and density between 6.21 and 9.87 ind/m². The largest organisms (over 50 mm) contain 30.6 % of soft parts. Porcelain snai...

2006-01-01

303

First record of Thylaeodus (Gastropoda: Vermetidae from the Equatorial Atlantic Ocean, with the description of a new species  

Directory of Open Access Journals (Sweden)

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 feeding 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.

Paula Spotorno

2013-02-01

304

Description of a new species of the genus Arganiella Giusti & Pezzoli, 1980 (Mollusca, Gastropoda, Hydrobiidae from the Iberian Peninsula  

Directory of Open Access Journals (Sweden)

Full Text Available A new species of Arganiella Giusti & Pezzoli, 1980, up to now a monotypic genus, thought to be endemic to the Italian Central Apennines, is described from the Iberian Peninsula. This new species, named Arganiella tartessica, is located in southwestern Spain, provinces of Huelva and Badajoz. In this paper, a detailed description of its morphological characters is given and new data of nervous system and ciliated areas in the cephalic region are provided.Se describe una especie ibérica de Arganiella Giusti y Pezzoli, 1980, un género que hasta ahora se consideraba monotípico y endémico de los Apeninos centrales italianos. Esta nueva especie, denominada Arganiella tartessica, ha sido localizada en el sureste español, en las provincias de Huelva y Badajoz. En este artículo se describen en detalle sus caracteres morfológicos y se presentan datos, hasta la fecha desconocidos en el género Arganiella, del sistema nervioso y de áreas ciliadas en la región cefálica.

Ramos, M.ª A.

2007-06-01

305

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

Directory of Open Access Journals (Sweden)

Full Text Available 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 1844, 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.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 describe 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.

Fred G. Thompson

2012-09-01

306

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 1844), 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...

Thompson, Fred G.

2012-01-01

307

Life-history traits of Fossaria cubensis (Gastropoda: Lymnaeidae under experimental exposure to Fasciola hepatica (Trematoda: Digenea  

Directory of Open Access Journals (Sweden)

Full Text Available The effect of exposing the lymnaeid snail Fossaria cubensis to the trematode Fasciola hepatica on the snail population's life-history traits was studied under laboratory conditions. Exposed individuals showed a lower survival rate than control snails, although from week 7 onward a slower decrease of this parameter in relation to the control group was observed. There were higher values of fecundity rate for the controls compared to the exposed group except during weeks 9, 10, 11 and 12, which was the time that followed the period when almost all of the infected snails died. Both the intrinsic and finite rates of natural increase were significantly higher for the control group, but exposed snails still attained a lower mean generation time. Age-specific trade-offs were found, mainly for the weekly increase in size versus the number of eggs per mass, the weekly increase in size versus the number of viable eggs per mass, the number of masses versus the hatching probability and the number of eggs versus the hatching probability. All these negative associations were significant for juveniles of both control and exposed snails and not for adults; however, exposed young individuals exhibited much higher values of the correlation coefficient than control animals.

Alfredo Gutiérrez

2000-10-01

308

Life-history traits of Fossaria cubensis (Gastropoda: Lymnaeidae) under experimental exposure to Fasciola hepatica (Trematoda: Digenea)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english The effect of exposing the lymnaeid snail Fossaria cubensis to the trematode Fasciola hepatica on the snail population's life-history traits was studied under laboratory conditions. Exposed individuals showed a lower survival rate than control snails, although from week 7 onward a slower decrease of [...] this parameter in relation to the control group was observed. There were higher values of fecundity rate for the controls compared to the exposed group except during weeks 9, 10, 11 and 12, which was the time that followed the period when almost all of the infected snails died. Both the intrinsic and finite rates of natural increase were significantly higher for the control group, but exposed snails still attained a lower mean generation time. Age-specific trade-offs were found, mainly for the weekly increase in size versus the number of eggs per mass, the weekly increase in size versus the number of viable eggs per mass, the number of masses versus the hatching probability and the number of eggs versus the hatching probability. All these negative associations were significant for juveniles of both control and exposed snails and not for adults; however, exposed young individuals exhibited much higher values of the correlation coefficient than control animals.

Gutiérrez, Alfredo; Perera, Gloria; Yong, Mary; Sánchez, Jorge; Lin, Wong.

309

Life-history traits of Fossaria cubensis (Gastropoda: Lymnaeidae) under experimental exposure to Fasciola hepatica (Trematoda: Digenea)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The effect of exposing the lymnaeid snail Fossaria cubensis to the trematode Fasciola hepatica on the snail population's life-history traits was studied under laboratory conditions. Exposed individuals showed a lower survival rate than control snails, although from week 7 onward a slower decrease of this parameter in relation to the control group was observed. There were higher values of fecundity rate for the controls compared to the exposed group except during weeks 9, 10, 11 and 12, which ...

Alfredo Gutiérrez; Gloria Perera; Mary Yong; Jorge Sánchez; Wong Lin

2000-01-01

310

A high molecular weight proteoglycan is differentially expressed during development of the mollusc Concholepas concholepas (Mollusca; Gastropoda; Muricidae).  

Science.gov (United States)

Incorporation of radioactive sulfate to hatched veliger larvae of the gastropod muricid Concholepas concholepas indicated that over 87% of the sulfated macromolecules were found in the detergent insoluble fraction, rich in extracellular matrix (ECM) components. The sulfated material was solubilized with guanidine salt followed by urea dialysis and fractionated by DEAE-Sephacel chromatography. Three sulfated compounds eluting at 0.7, 1.1, and 3.0 M NaCl, called peaks I, II, and III, respectively, were obtained. The sulfated compound present in peak I was degraded by pronase or sodium alkaline treatment to a small sulfated resistant material, suggesting the presence of a proteoglycan (PG). Filtration analysis on Sephacryl S-500 and SDS-PAGE of the intact PG indicates that it has a high molecular weight (360,000 to over 1 x 10(6)). Monoclonal antibodies (mAb) against this PG were produced. The specificity of one mAb, the 6H2, was demonstrated by size chromatography and ELISA analysis. The epitope recognized by this mAb seems to be present in the core protein of the PG. Both the extent of sulfation and the presence of different sulfated species of PGs were evaluated during the development of this mollusc. A twelvefold increase in the incorporation of sulfate to PGs per milligram of protein was found in veliger larvae compared to blastula-glastula stages. This change correlated well with the differential expression of the sulfated PG present in peak I. Biochemical and immunological analysis indicate that high levels of this PG are found in veliger and trocophore larvae in comparison with blastula-gastrula and early juveniles.(ABSTRACT TRUNCATED AT 250 WORDS) PMID:1460434

Brandan, E; González, M; Inestrosa, N C; Tremblay, C; Urrea, R

1992-12-15

311

Seasonal variation in glycoconjugates of the pedal glandular system of the rayed Mediterranean limpet, Patella caerulea (Gastropoda: Patellidae).  

Science.gov (United States)

Glycoconjugates secreted by the pedal system of the rayed limpet, Patella caerulea, were characterised in situ by histochemical and lectin-histochemical methods in individuals collected around the annual cycle, in November, March, and June. Stainings with periodic acid-Schiff (PAS), Alcian blue pH 2.5 (AB pH 2.5), Alcian blue pH 1.0 (AB pH 1.0), high-iron diamine-Alcian blue pH 2.5 and lectin binding assays with 9 lectins (Con A, WGA, succinylated-WGA, PNA, DBA, SBA, AAA, UEA-I, LTA) were performed. Four secreting cell types were observed in the sole, one in the peripheric region, and two in the sidewall. Glycoconjugate composition varied among cell types and also in one and the same cell type throughout the year. ?-Elimination followed by PAS and AB pH 2.5 stainings indicated that most saccharidic chains were O-linked to the protein backbone. Secretion by sole and peripheric region was acidic, carboxylated and/or sulfated, whereas that of the sidewall was neutral. Glucosaminylated and 1,4-fucosylated residuals were predominant in the cell types along the year, 1,2-fucosylated residuals being observed only in the sidewall cells in June. Mannosylated and/or glycosylated residuals were observed in all cells mostly in November. Galactosylated/galactosaminylated residuals were present mostly in the sidewall cells and in the sole subepidermal mucocytes in June. Mannosylated and/or glycosylated residuals in November are probably linked to gonad maturation or to higher locomotion and foraging activity, whereas galactosaminylation in the sole cells and 1,2-fucosylation and glucosaminylation in the sidewall cells in June are linked to a prolonged stationary state, increasing water adsorption to counteract dehydration and/or to modulate microbial interactions. PMID:23683552

Petraccioli, Agnese; Maio, Nicola; Guarino, Fabio Maria; Scillitani, Giovanni

2013-06-01

312

Opisthobranchia (Mollusca, Gastropoda) – more than just slimy slugs. Shell reduction and its implications on defence and foraging  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Background: In general shell-less slugs are considered to be slimy animals with a rather dull appearance and a pest to garden plants. But marine slugs usually are beautifully coloured animals belonging to the less-known Opisthobranchia. They are characterized by a large array of interesting biological phenomena, usually related to foraging and/or defence. In this paper our knowledge of shell reduction, correlated with the evolution of different defensive and foraging strategies is reviewed, a...

Wa?gele, Heike; Klussmann-kolb, Annette

2005-01-01

313

Temporal speciation pattern in the western Mediterranean genus Tudorella P. Fischer, 1885 (Gastropoda, Pomatiidae) supports the Tyrrhenian vicariance hypothesis.  

Science.gov (United States)

The land snail genus Tudorella shows a peculiar disjunct distribution around the western Mediterranean coasts. Despite high phenotypic plasticity, only two species with a disputed number of subspecific taxa are currently recognised. We delimited the species with mitochondrial (COI & 16S) and nuclear (ITS-1) markers based on the unified species concept and suggested that there are eight species in the genus, two of them currently undescribed. Applying Bayesian phylogenetic model selection, we tested four different biogeographic hypotheses that could be causal for the current distribution pattern of extant Tudorella species. A scenario involving vicariance events resulting from the repeated splits of the Tyrrhenian plate with subsequent dispersal events over land bridges during the Pliocene received greatest support in the data. PMID:19772926

Pfenninger, Markus; Véla, Errol; Jesse, Ruth; Elejalde, Miren Arantzazu; Liberto, Fabio; Magnin, Frédéric; Martínez-Ortí, Alberto

2010-02-01

314

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

Science.gov (United States)

A survey of the larval stages (cercariae and metacercariae) of trematodes (Digenea) found in planorbid snails in Central Europe (Austria, Czech Republic, south-east Germany, Hungary, Poland and the Slovak Republic) is presented based on a study of 7,628 snails of 12 species examined between 1998-2006. A total of 34 trematode larval stages, comprising cercariae of 28 species and metacercariae of seven species (one species occurred both as cercaria and metacercaria) of nine families were found in 898 (11.5%) snails of eight species. The dominant cercariae were those belonging to the Rubenstrema exasperatum (Rudolphi, 1819)/Neoglyphe locellus (Kossack, 1910) species complex, Tylodelphys excavata (Rudolphi, 1803) and Echinostoma spiniferum (La Valette, 1855) sensu Nasincová (1992), all from Planorbarius corneus (Linnaeus). Almost the same spectrum of cercariae of the families Echinostomatidae, Plagiorchiidae and Omphalometridae was found in the present study as in previous reports; however, a considerably lower spectrum of cercariae of the families Diplostomidae and Strigeidae was recorded. The most frequent metacercariae were those of Echinoparyphium aconiatum Dietz, 1909, Neoglyphe locellus and Moliniella anceps (Molin, 1859), all occurring mainly in P. corneus. The most heavily infected snail species was P. corneus, followed by Planorbis planorbis (Linnaeus) and Segmentina nitida (Müller). The widest spectrum of trematode species was found in P. planorbis and P. corneus. Forty-two cercariae identified to the species level belonging to 15 families, plus an additional 43 taxa recorded under generic or provisional names, were reported from 11 species of planorbids in previous studies carried out in Central Europe. However, the actual number of trematode species occurring in the planorbid snails is probably much lower, because many, if not most, larval stages reported under provisional names or unidentified to the species level may be conspecific with identified adult forms. A key to the cercariae and metacercariae recorded from planorbids in Central Europe, together with illustrations of those species encountered most frequently in the field, is provided to facilitate identification. PMID:18210216

Faltýnková, Anna; Nasincová, Vanda; Kablásková, Lenka

2008-03-01

315

Sclerochronology - a highly versatile tool for mariculture and reconstruction of life history traits of the queen conch, Strombus gigas (Gastropoda)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The queen conch, Strombus gigas, is an important fisheries resource in the Western Tropical Atlantic. In order to maintain harvesting success, improve fisheries management and contribute to mariculture pursuits, a detailed understanding of the life history traits of this species is required. Traditionally, this has been achieved by tedious and time-consuming long-term field observations. This study presents a highly versatile and rapid technique to estimate the timing and rate of shell growth...

Radermacher, Pascal; Scho?ne, Bernd R.; Gischler, Eberhard; Oschmann, Wolfgang; The?bault, Julien; Fiebig, Jens

2009-01-01

316

The occurrence, bionomics and potential impacts of the invasive freshwater snail Tarebia granifera (Lamarck, 1822) (Gastropoda: Thiaridae) in South Africa  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The Asian prosobranch snail Tarebia granifera was reported from South Africa (and Africa) for the first time in 1999 in northern KwaZulu-Natal though it was probably introduced sometime prior to 1996. In the 10 years since its discovery it has spread rapidly, particularly northwards, into Mpumalanga province, the Kruger National Park and Swaziland. The snail has colonized different types of habitat, from rivers, lakes and irrigation canals to concrete lined reservoirs and ornamental ponds. It...

2009-01-01

317

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)

Full Text Available SciELO Brazil | Language: English Abstract in english 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.

Amilcar Brum, Barbosa; Sonia Barbosa dos, Santos.

318

The occurrence of Clithon retropictus (v. Martens, 1879) (Gastropoda: Neritidae) in an unusual habitat, northern Jeju Island, Republic of Korea  

Science.gov (United States)

Clithon retropictus is a neritid gastropod inhabiting mainly brackish water. Currently this species has been listed as a second grade endangered species of wildlife in Korea by the Ministry of Environment, due to the decrease in its population size. C. retropictus has previously been identified from estuaries on the south coast of Korea. In Jeju Island, this species has been reported only from the south coast. However, a population has recently been discovered on the north coast of the island in an apparently new type of habitat, under rocks adjacent to a dry riverbed on a muddy substrate. C. retropictus was found to be aggregated under some of the larger rocks, and the habitat was located near the high tide line. The present study reports some possible reasons for the occurrence of the population in this unusual habitat, and provides useful information on the biometry and population size which can be used in the management of this endangered species.

Noseworthy, Ronald G.; Lee, Hee-Jung; Choi, Kwang-Sik

2013-09-01

319

First report of Angiostrongylus cantonensis (Nematoda: Metastrongylidae) in Achatina fulica (Mollusca: Gastropoda) from Southeast and South Brazil.  

Science.gov (United States)

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 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. PMID:21120369

Maldonado Jr, Arnaldo; Simões, Raquel O; Oliveira, Ana Paula M; Motta, Esther M; Fernandez, Mônica A; Pereira, Zilene M; Monteiro, Simone S; Torres, Eduardo J Lopes; Thiengo, Silvana Carvalho

2010-11-01

320

First report of Angiostrongylus cantonensis (Nematoda: Metastrongylidae) in Achatina fulica (Mollusca: Gastropoda) from Southeast and South Brazil  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

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

 
 
 
 
321

DNA barcodes and phylogenetic affinities of the terrestrial slugs Arion gilvus and A. ponsi (Gastropoda, Pulmonata, Arionidae)  

Science.gov (United States)

Abstract The Iberian Peninsula is a region with a high endemicity of species of the terrestrial slug subgenus Mesarion. Many of these species have been described mainly on subtle differences in their proximal genitalia. It therefore remains to be investigated 1) whether these locally diverged taxa also represent different species under a phylogenetic species concept as has been shown for other Mesarion species outside the Iberian Peninsula, and 2) how these taxa are phylogenetically related. Here, we analysed DNA sequence data of two mitochondrial (COI and 16S) genes, and of the nuclear ITS1 region, to explore the phylogenetic affinities of two of these endemic taxa, viz. Arion gilvus Torres Mínguez, 1925 and A. ponsi Quintana Cardona, 2007. We also evaluated the use of these DNA sequence data as DNA barcodes for both species. Our results showed that ITS did not allow to differentiate among most of the Mesarion molecular operational taxonomic units (MOTUs) / morphospecies in Mesarion. Yet, the overall mean p-distance among the Mesarion MOTUs / morphospecies for both mtDNA fragments (16.7% for COI, 13% for 16S) was comparable to that between A. ponsi and its closest relative A. molinae (COI: 14.2%; 16S: 16.2%) and to that between A. gilvus and its closest relative A. urbiae (COI: 14.4%; 16S: 13.4%). Hence, with respect to mtDNA divergence, both A. ponsi and A. gilvus, behave as other Mesarion species or putative species-level MOTUs and thus are confirmed as distinct ‘species’.

Breugelmans, Karin; Jordaens, Kurt; Adriaens, Els; Remon, Jean Paul; Cardona, Josep Quintana; Backeljau, Thierry

2013-01-01

322

DNA barcodes and phylogenetic affinities of the terrestrial slugs Arion gilvus and A. ponsi (Gastropoda, Pulmonata, Arionidae).  

Science.gov (United States)

The Iberian Peninsula is a region with a high endemicity of species of the terrestrial slug subgenus Mesarion. Many of these species have been described mainly on subtle differences in their proximal genitalia. It therefore remains to be investigated 1) whether these locally diverged taxa also represent different species under a phylogenetic species concept as has been shown for other Mesarion species outside the Iberian Peninsula, and 2) how these taxa are phylogenetically related. Here, we analysed DNA sequence data of two mitochondrial (COI and 16S) genes, and of the nuclear ITS1 region, to explore the phylogenetic affinities of two of these endemic taxa, viz. Arion gilvus Torres Mínguez, 1925 and A. ponsi Quintana Cardona, 2007. We also evaluated the use of these DNA sequence data as DNA barcodes for both species. Our results showed that ITS did not allow to differentiate among most of the Mesarion molecular operational taxonomic units (MOTUs) / morphospecies in Mesarion. Yet, the overall mean p-distance among the Mesarion MOTUs / morphospecies for both mtDNA fragments (16.7% for COI, 13% for 16S) was comparable to that between A. ponsi and its closest relative A. molinae (COI: 14.2%; 16S: 16.2%) and to that between A. gilvus and its closest relative A. urbiae (COI: 14.4%; 16S: 13.4%). Hence, with respect to mtDNA divergence, both A. ponsi and A. gilvus, behave as other Mesarion species or putative species-level MOTUs and thus are confirmed as distinct 'species'. PMID:24453553

Breugelmans, Karin; Jordaens, Kurt; Adriaens, Els; Remon, Jean Paul; Cardona, Josep Quintana; Backeljau, Thierry

2013-12-30

323

DNA barcodes and phylogenetic affinities of the terrestrial slugs Arion gilvus and A. ponsi (Gastropoda, Pulmonata, Arionidae)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The Iberian Peninsula is a region with a high endemicity of species of the terrestrial slug subgenus Mesarion. Many of these species have been described mainly on subtle differences in their proximal genitalia. It therefore remains to be investigated 1) whether these locally diverged taxa also represent different species under a phylogenetic species concept as has been shown for other Mesarion species outside the Iberian Peninsula, and 2) how these taxa are phylogenetically related. Here, we ...

Backeljau, Thierry; Jordaens, Kurt; Breugelmans, Karin; Quintana Cardona, Josep; Remon, Jean Paul; Adriaens, Els

2013-01-01

324

Shell morphology of the freshwater snail Gundlachia ticaga (Gastropoda: Ancylidae) from four sites in Ilha Grande, southeastern Brazil  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english 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.

Luiz Eduardo M., Lacerda; Igor C., Miyahira; Sonia B., Santos.

325

50 CFR 665.221 - Definitions.  

Science.gov (United States)

...margaritifera. other clams Other Bivalves. sea squirts Tunicates. sponges Porifera. tako, he`e octopi Cephalopods. sea snails Gastropoda. sea slugs Opistobranchs. Limu seaweed Algae. Live rock. segmented...

2010-10-01

326

The role of light and gravity in the experimental transmission of Echinostoma caproni (Digenea: Echinostomatidae) cercariae to the second intermediate host, Biomphalaria glabrata (Gastropoda: Pulmonata).  

Science.gov (United States)

Trematode cercariae inhabit predictable environments and respond to trigger cues with genetically fixed releaser responses when foraging for the upstream host. The effect of light and gravity on the transmission of Echinostoma caproni cercariae to Biomphalaria glabrata was investigated experimentally. Transmission chambers were constructed of clear polyvinyl chloride pipe. Snails were constrained within the chamber to prevent movement, while permitting the cercariae to swim freely. A trial consisted of 2 infected B. glabrata shedding E. caproni cercariae placed at the center of the chamber, with 5 uninfected B. glabrata placed 10 cm on either side (or above and below) of the shedding snails as sentinels. There was no significant difference in the prevalence of infection sentinel snails in either experiment (light vs. dark or top vs. bottom); however, mean intensity was significantly higher in sentinel snails in the dark portion of the chamber (42.5 vs. 10.4; P = 0.001) and the top of the transmission chamber (66.1 vs. 38.0; P = 0.0003). There was a high correlation between the number of metacercariae collected from sentinel snails and the total number of infective units (metacercariae + unsuccessful cercariae): r = 0.992 (light vs. dark) and r = 0.957 (top vs. bottom), respectively, at cercariae densities estimated from 22 to 3,304/L. The results suggest that cercariae of E. caproni exhibit negative photo- and geotaxis in searching for a second intermediate host. Stereotypical releaser responses to environmental trigger cues (light and gravity) allow E. caproni cercariae to exploit flexible strategies for completing the life cycle consistent with the broad range second intermediate and definitive hosts used by E. caproni cercariae and adults, respectively. PMID:18954154

Platt, Thomas R; Burnside, Lindsay; Bush, Elizabeth

2009-06-01

327

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)

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.

Bargues M Dolores

2011-07-01

328

Response of the Lymnaea peregra (Mollusca: gastropoda) to oil and dispersant. Akvarietest av responsen paa olja och dispergeringsmedel hos Lumnaea peregra (Mollusca)  

Energy Technology Data Exchange (ETDEWEB)

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).

Lax, H.J.; Vainio, T.

1988-01-01

329

La malacofaune du site Natura 2000 du lac de Saint Léger et mention de Vertigo angustior Jeffreys, 1830 (Mollusca, Gastropoda, Vertiginidae pour les Alpes-de-Haute-Provence  

Directory of Open Access Journals (Sweden)

Full Text Available In 2007, the non-marine mollusc of the Natura 2000 site FR9301546 « Lac de Saint Léger » and its catchment were surveyed on the basis of 19 and 13 stations respectively. This survey allowed us to find 11 species of freshwater molluscs in the lake (9 snails and 3 species of pea mussels and 21 terrestrial species in the fen (5 slugs and 16 land snails, among which Vertigo angustior Jeffreys, 1830. It is the first report of this species in the Alpes-de-Haute-Provence. In the catchment, 25 land species (5 slugs and 20 land snails were discovered but no freshwater species. The freshwater fauna of the lake is very poor due to the oligotrophic conditions of its water. In contrast, the land fauna of the fen, located at 1 300 m a.s.l., is very similar to those of wetland plains. The malacofauna of the catchment (about 50 ha is relatively poor considering its geographic position in the French Alps.

Xavier Cucherat

2010-01-01

330

Première mention de la Veloutée moine, Ashfordia granulata (Alder, 1830 (Gastropoda, Hygromiidae dans la région Nord - Pas-de-Calais (France  

Directory of Open Access Journals (Sweden)

Full Text Available Widely distributed in England, Ashfordia granulata is known from France in the Somme, Bretagne and Basse-Normandie regions. This note describes the first reporting of the species in the Nord-Pas-de-Calais region. It was found in seepages between beach and sand dunes at Pointe aux Oies, between Wimereux and Ambleteuse. This population is restricted to a few square meters and was not found in similar biotopes nearby. Trampling by hikers and marine erosion are the major threats to this isolated population.

Tarek Oueslati

2012-01-01

331

Occurrence de Granaria stabilei anceyi (Fagot, 1881 (Gastropoda, Pulmonata, Chondrinidae sur le massif de la Sainte-Victoire (Bouches-du-Rhône  

Directory of Open Access Journals (Sweden)

Full Text Available We provide a synthesis of the data about Granaria stabilei anceyi. This subspecies is present on the moutains of the Sainte-Baume (Var and Bouches-du-Rhône and of the Sainte-Victoire (Bouches-du-Rhône where it had never been quoted historically.

Daniel Pavon

2005-01-01

332

Periwinkle (Gastropoda: Littorinidae) habitat selection and its impact upon microalgal populations / Seleção de hábitat de gastrópodes Littorinidae e seu impacto sobre populações de microalgas  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese O presente estudo examina seleção do hábitat e pressão de herbivoria pelo gastrópode Nodilittorina lineolata (Gmelin, 1791) no costão rochoso de Arraial do Cabo, RJ, Brasil (lat. 23°S, long. 43°W). Experimentos de transferência sugerem que os gastrópodos selecionam ativamente a região do médio-litor [...] al, em que o cirripédio Chthamalus bisinuatus Pilsbry é o invertebrado séssil dominante. Nós também conduzimos um experimento de exclusão, com gaiolas, no médio-litoral, manipulando os herbívoros e luz, para acessar o impacto da herbivoria sobre a densidade de microalgas. A pressão de herbivoria reduziu significativamente a abundância de microalgas no médiolitoral, sugerindo que a disponibilidade de alimento exerce um papel importante na seleção do hábitat dos gastrópodos estudados. Abstract in english The present study examines habitat selection and grazing pressure of the periwinkle Nodilittorina lineolata (Gmelin, 1791) on the rocky shore of Arraial do Cabo, RJ, Brazil (lat. 23°S, long. 43°W). Transfer experiments suggest that periwinkles actively select the mid intertidal, where the cirripede [...] Chthamalus bisinuatus Pilsbry is the dominant sessile invertebrate. We also conducted a caging experiment in the middle intertidal, manipulating grazers and light, to assess the impact of grazing upon microalgal density. Grazing pressure significantly reduced microalgal abundance at the mid-intertidal level, suggesting that food availability plays an important role in the habitat selection of periwinkles on the studied shore.

M., APOLINÁRIO; R., COUTINHO; M. H., BAETA-NEVES.

333

Land snail fauna of the Humosu Secular Forest (Suceava County, Romania); a new locality of Serrulina serrulata (L. Pfeiffer, 1847) (Gastropoda: Pulmonata: Clausiliidae)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The paper reports faunistic data on the land snail fauna of the protected beech forest reserve of Fagetul Secular Humosu (Suceava County, Romania). We found several species with Carpathian distribution, and the study area is probably the easternmost locality of these species. The Humosu Forest Reserve is the fourth locality of Serrulina serrulata (L. Pfeiffer, 1847) in Romania. The species survival requires occurrence of preserved old-growth forests with decaying tree trunks and logs.

Barna Páll-Gergely; C?t?lin-Constantin Roibu

2011-01-01

334

Assessing the effects of fluoxetine on Physa acuta (Gastropoda, Pulmonata) and Chironomus riparius (Insecta, Diptera) using a two-species water-sediment test  

Energy Technology Data Exchange (ETDEWEB)

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 {mu}g/L. A fifth treatment (87.5 {mu}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 {mu}g/L), while the opposite effect was observed at the highest treatment (250 {mu}g/L). Additional studies should be conducted to establish if the statistically significant differences observed in F0 sex ratio at the 62.5 {mu}g/L and F1 adult emergence at 31.25 {mu}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.

Sanchez-Argueello, Paloma [Laboratory for Ecotoxicology, Department of the Environment, INIA, Crta, A Coruna km 7, 28040 Madrid (Spain)], E-mail: arguello@inia.es; Fernandez, Carlos; Tarazona, Jose V. [Laboratory for Ecotoxicology, Department of the Environment, INIA, Crta, A Coruna km 7, 28040 Madrid (Spain)

2009-03-01

335

New genus Arxellia with new species of Solariellidae (Gastropoda: Trochoidea) from New Caledonia, Papua New Guinea, Philippines, Western Australia, Vanuatu and Tonga .  

Science.gov (United States)

A new genus, Arxellia, is described in the family Solariellidae. Nine species are referred to this taxon, eight of which are new and are described in this paper (Arxellia trochos n. sp., Arxellia boucheti n. sp., Arxellia herosae n. sp., Arxellia helicoides n. sp., Arxellia tracheia n. sp., Arxellia thaumasta n. sp., Arxellia maestratii n. sp. and Arxellia erythrea n. sp.). The previously described species Bathymophila tenorioi Poppe, Tagaro & Dekker, 2006 is reassigned to Arxellia. PMID:24990045

Vilvens, Claude; Williams, Suzanne T; Herbert, David G

2014-01-01

336

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)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese 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.

José Willibaldo, Thomé.

337

Veronicellidae (Mollusca, Gastropoda neotropicais: IV. Redescrição dos tipos de Vaginula andreana, Vaginula reinhardti e Vaginula trilineata, no Zoologisk Museum de Copenhague, Dinamarca  

Directory of Open Access Journals (Sweden)

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 (Ilhas Mascarenhas; leg. Andrea, encontrado num pote de plantas no Jardim Botânico de Copenhague. Discute-se a sinonímia das espécies.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 (Mascarene ls.; leg. Andrea; found in a pot of plants in the Botanical Garden of Copenhagen. The synonymy of the species is discussed.

José Willibaldo Thomé

1988-07-01

338

Current knowledge on population studies on five continental molluscs (Mollusca, Gastropoda et Bivalvia of Santa Catarina State (SC, Central Southern Brazil region  

Directory of Open Access Journals (Sweden)

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.

A. Ignacio Agudo-Padrón

2011-03-01

339

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)

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.

2011-06-01

340

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)

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.

Nehring, S.

2000-05-01

 
 
 
 
341

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)

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.

Sankurathri, C.S. (Dept. of the Environment, Nanaimo, British Columbia); Holmes, J.C.

1976-10-01

342

Contribution to the knowledge of the Bulgarian species of the genus Vitrea (Gastropoda, Pristilomatidae) with the description of a new species  

Science.gov (United States)

Abstract A new species of genus Vitrea is described: Vitrea ulrichi sp. n. is the eleventh species within the genus found in Bulgaria, and the largest representative of the Bulgarian Vitrea. Some critical notes on the taxonomy of the species V. bulgarica and V. sturanyi are presented. A key is provided for the determination of the species of Vitrea found in the country.

Georgiev, Dilian; Dedov, Ivailo

2014-01-01

343

Mode of life of Early Devonian Orthonychia protei (Neritimorpha, Gastropoda inferred from its post-larval shell ontogeny and muscle scars  

Directory of Open Access Journals (Sweden)

Full Text Available Rich fossil material of the Early Devonian Orthonychia protei (Oehlert, 1883 from the Saint Céneré Formation, Brittany (France provides a unique chance to analyze the infraspecific variability of muscle scars and post-larval shell morphology. The position of the muscle scar in this species depends on the shape of the teleoconch, which seems to be influenced by its living position upon the crinoid host. Individuals having a teleoconch aperture with a pentagonal outline and five apertural processes probably lived on top of a crinoid calyx and their muscle was attached to the center of their teleoconchs. However, muscle scars are situated more laterally in individuals with irregular teleoconchs lacking apertural processes. The latter group was probably attached to another part of the crinoid body or even to another type of hard substrate. Juvenile post-larval Orthonychia protei was a mobile animal, but very early in its ontogeny became adapted to a fixed position on the crinoid body and remained immobile for the majority of its post-larval ontogeny. Long-term coexistence of Orthonychia protei with the same crinoid suggests that this species had a long-term advantage from such an ecological strategy. However, the existence of individuals with irregularly shaped teleoconchs suggests that Orthonychia protei could also live successfully outside of the digestive openings of crinoids and, thus, use a food source not closely connected with crinoids. This interpretation can be supported by the fact that at least some Silurian and Devonian platyceratids were adapted to living on small firm objects (like empty cephalopod shells lying on the sediment surface.

Frýda J

2008-12-01

344

Report on the ocurrence of Angiostrongylus costaricensis in southern Brazil, in a new intermediate host from the genus Sarasinula (Veronicellidae, Gastropoda  

Directory of Open Access Journals (Sweden)

Full Text Available Veronicellid slugs are the main intermediate hosts for Angiostrongylus costaricencis. In a rural locality in Nova Itaberaba (SC, southern Brazil Sarasinula linguaeformis was identified as a crop pest. The parasitological examination revealed A. costaricencis infection in 43 out ot 50 slugs. The prevalence of 86% and the individual parasitic burdens are the highest sofar reported in Brazil and S. linguaeformis is the first species from the genus Sarasinula to be identified as intermediate host for A. costaricencis in southern Brazil.

Laitano Antonio Carlo

2001-01-01

345

Description of two new species of Rissoella Gray, 1847 (Mollusca, Gastropoda, Heterobranchia) from Venezuela, with a key to the Caribbean species known for the genus  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Two new species of the genus Rissoella Gray, 1847 are described from Venezuela, one from the National Park Morrocoy, Rissoella morrocoyensis sp. n. and the other from the Wildlife Refuge Isla de Aves, Rissoella venezolanicola sp. n. Rissoella morrocoyensis sp. n. has a deep umbilicus (partly closed), preumbilical cord, black head, hypobranchial gland marked by a pale yellow boomerang-shaped ribbon and it lives on the leaves of the seagrass Thalassia testudinum Banks & König, 1805. Rissoella ...

Caballer, Manuel; Ortea, Jesus; Narciso, Samuel

2011-01-01

346

Description of two new species of Rissoella Gray, 1847 (Mollusca, Gastropoda, Heterobranchia) from Venezuela, with a key to the Caribbean species known for the genus  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Two new species of the genus Rissoella Gray, 1847 are described from Venezuela, one from the National Park Morrocoy, Rissoella morrocoyensis sp. n. and the other from the Wildlife Refuge Isla de Aves, Rissoella venezolanicola sp. n. R. morrocoyensis sp. n. has a deep umbilicus (partly closed), preumbilical cord, black head, hypobranchial gland marked by a pale yellow boomerang-shaped ribbon and it lives on the leaves of the seagrass Thalassia testudinum Banks & König, 1805. R. venezolanicola...

Caballer Gutierrez, Manuel; Ortea, Jesus; Narciso, Samuel

2011-01-01

347

Relationships of the Triassic Eucycloidea Koken, 1897 (Mollusca, Gastropoda to modern genera such as Pagodatrochus, Calliotropis and Euchelus, based on morphology of the early shell  

Directory of Open Access Journals (Sweden)

Full Text Available The aim of this study is to document the relationship that may exist between Triassic species of Eucycloscala, Ampezzotrochus, Sabrinella, Microcheilus, Eunemopsis and Pseudoclanculus and living species of genera such as Pagodatrochus, Turcica, Calliotropis, Danilia, and Euchelus. Their shell has a nacreous inner layer and ornament of axial ribs on the early teleoconch. This ornament distinguishes from living and fossil Vetigastropoda with Trochus, and Turbo-like shells. Eucycloscalidae, containing the Triassic genera Eucycloscala and Ampezzotrochus, can be distinguished from Eunemopsis and Pseudoclanculus and the Eunemopsidae fam. nov. by folds on the inner lip and Sabrinellidae fam. nov. with Sabrinella and Microcheilus by the varix of the aperture of the last whorl. Lanascala with Lanascalidae belongs here. Neoeunema gen. nov. represents a Triassic member of Eucyclidae, which contains numerous Jurassic genera and species. Pseudoturcicidae fam. nov. differs by the ornament of the early teleoconch. The Chilodontidae form a characteristic Cretaceous group with teeth on the inner side of their outer lip. Three families of modern genera can be distinguished by the arrangement of teeth in the radula: four pairs in Pagodatrochidae fam. nov. and Turcicidae fam. nov., and three pairs in Calliotropidae, documented with Euchelus. The Seguenzioidea represents a related group having a distinctive radula with two lateral pairs of teeth and a variety of shell shapes and ornament. The early teleoconch of Seguenziidae (with slit in the aperture and Ancistrobasidae fam. nov. (without such a slit resembles that of the Eucycloscalidae, but has a strong spiral rib in addition to the axial ribs. The new species Microcheilus maxwelli sp. nov., Eucycloidea madagascariensis sp. nov., new genera Pseudoturcica and Heterodiscohelix, and new families Sabrinellidae fam. nov., Euemopsidae fam. nov., Pseudoturcidae fam. nov., Pagodatrochidae fam. nov. Turcicidae fam. nov., and Ancistrobasidae fam. nov. are introduced. The fossil record confirms existence of two independent branches of Vetigastropoda since more than 220 Ma, and within one of these branches parallel to the Eucycloidea the Seguenzioidea since Mesozoic times.

Bandel K

2010-09-01

348

Relationships of the Triassic Eucycloidea Koken, 1897 (Mollusca, Gastropoda) to modern genera such as Pagodatrochus, Calliotropis and Euchelus, based on morphology of the early shell  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The aim of this study is to document the relationship that may exist between Triassic species of Eucycloscala, Ampezzotrochus, Sabrinella, Microcheilus, Eunemopsis and Pseudoclanculus and living species of genera such as Pagodatrochus, Turcica, Calliotropis, Danilia, and Euchelus. Their shell has a nacreous inner layer and ornament of axial ribs on the early teleoconch. This ornament distinguishes from living and fossil Vetigastropoda with Trochus, and Turbo-like shells. Eucycloscalidae, cont...

Bandel K

2010-01-01

349

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)

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.

Carmen Fuentealba

2012-11-01

350

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)

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.

Vidal Haddad Junior

2006-10-01

351

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  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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...

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

2006-01-01

352

The terrestrial Gastropoda Megalobulimus abbreviatus as a useful model for nociceptive experiments: effects of morphine and naloxone on thermal avoidance behavior  

Directory of Open Access Journals (Sweden)

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 < 0.001. With 2.5 mg/kg (16.26 ± 3.19 s, 5.0 mg/kg (11.53 ± 1.64 s and 7.5 mg/kg naloxone (7.38 ± 1.6 s, there was a significant, not dose-dependent decrease in latency compared to the control (33.44 ± 8.53 s and saline groups (29.1 ± 9.91 s. No statistically significant difference was found between the naloxone-treated groups. With naloxone plus morphine, there was a significant decrease in latency when compared to all other groups (minimum 64% in the saline group and maximum 83.2% decrease in the morphine group. These results provide evidence of the involvement of endogenous opioid peptides in the control of thermal withdrawal behavior in this snail, and reveal a stereotyped and reproducible avoidance behavior for this snail species, which could be studied in other pharmacological and neurophysiological studies.

M. Achaval

2005-01-01

353

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)

Full Text Available SciELO Brazil | Language: English Abstract in english 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

Achaval, M.; Penha, M.A.P.; Swarowsky, A.; Rigon, P.; Xavier, L.L.; Viola, G.G.; Zancan, D.M..

354

Report on the occurrence of Angiostrongylus costaricensis in southern Brazil, in a new intermediate host from the genus Sarasinula (Veronicellidae, Gastropoda).  

Science.gov (United States)

Veronicellid slugs are the main intermediate hosts for Angiostrongylus costaricencis. In a rural locality in Nova Itaberaba (SC, southern Brazil) Sarasinula linguaeformis was identified as a crop pest. The parasitological examination revealed A. costaricencis infection in 43 out ot 50 slugs. The prevalence of 86% and the individual parasitic burdens are the highest sofar reported in Brazil and S. linguaeformis is the first species from the genus Sarasinula to be identified as intermediate host for A. costaricencis in southern Brazil. PMID:11340504

Laitano, A C; Genro, J P; Fontoura, R; Branco, S S; Maurer, R L; Graeff-Teixeira, C; Milanez, J M; Chiaradia, L A; Thomé, J W

2001-01-01

355

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.

2010-03-01

356

Accumulation of free and covalently bound microcystins in tissues of Lymnaea stagnalis (Gastropoda) following toxic cyanobacteria or dissolved microcystin-LR exposure  

Energy Technology Data Exchange (ETDEWEB)

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 mug L{sup -1}) and ii) Planktothrix agardhii suspensions producing 5 and 33 mug MC-LR equivalents L{sup -1} over a 5-week period, and after a 3-week depuration period. Snails exposed to dissolved MC-LR accumulated up to 0.26 mug total MCs g{sup -1} dry weight (DW), with no detection of bound MCs. Snails exposed to MCs producing P. agardhii accumulated up to 69.9 mug total MCs g{sup -1} DW, of which from 17.7 to 66.7% were bound. After depuration, up to 15.3 mug g{sup -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.

Lance, Emilie, E-mail: emilie.lance@live.f [UMR CNRS Ecobio 6553, University of Rennes 1, Campus de Beaulieu, 265 Avenue du General Leclerc, 35042 Rennes Cedex (France); Neffling, Milla-Riina [Department of Biochemistry and Pharmacy, Abo Akademi University, Tykistoekatu 6, FI-20520 Turku (Finland); Gerard, Claudia [UMR CNRS Ecobio 6553, University of Rennes 1, Campus de Beaulieu, 265 Avenue du General Leclerc, 35042 Rennes Cedex (France); Meriluoto, Jussi [Department of Biochemistry and Pharmacy, Abo Akademi University, Tykistoekatu 6, FI-20520 Turku (Finland); Bormans, Myriam [UMR CNRS Ecobio 6553, University of Rennes 1, Campus de Beaulieu, 265 Avenue du General Leclerc, 35042 Rennes Cedex (France)

2010-03-15

357

The Biology of Lymnaea peregra (Muller (Gastropoda:Pulmonata: Basommatophora with Special Reference to the Effects of Herbicides on its Reproduction  

Directory of Open Access Journals (Sweden)

Full Text Available The freshwater snail, Lymnaea peregra (Muller is widely distributed in the UK and is probably the commonest species in Europe. Culture of L. peregra in laboratory conditions have paid attention to foods, temperature and water quality, and these directly affect the life history traits, such as growth rate, age of maturation and fecundity. The occurrence of the herbicide, simazine in freshwater habitats does not only have a direct effect on the distribution of snails, but may also have indirect effects on both higher and lower trophic levels. It is more important to determine the influence of herbicides on the population densities of a snail which is needed for both ecological balance and economic importance.

M. Nazrul Islam

2001-01-01

358

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)

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.

C.M. Kerchove

2002-04-01

359

Elysia timida (Risso, 1818) (Gastropoda, Opisthobranchia): relationship and feeding deterrence to a potential predator on the south-western Mediterranean coast  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The relationship between the sacoglossan Elysia timida and the ornate wrasse Thalassoma pavo was studied in two laboratory experiments using artificial models. A feeding-preference experiment was conducted to determine whether mollusc extract deterred feeding by T. pavo, by using a ‘‘realistic’’ mollusc model(imitating the colour pattern of E. timida) coated with mollusc extract, and a reference model (without imitation or extract), and fishes collected from two locations. ...

Gime?nez Casalduero, Francisca; Muniain, Claudia; Garci?a Charton, Jose? Antonio

2001-01-01

360

Evaluation of the cholinomimetic actions of trimethylsulfonium, a compound present in the midgut gland of the sea hare Aplysia brasiliana (Gastropoda, Opisthobranchia)  

Digital Repository Infrastructure Vision for European Research (DRIVER)

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 competiti...

Kerchove, C. M.; Markus, R. P.; Freitas, J. C.; Costa-lotufo, L. V.

2002-01-01

 
 
 
 
361

Evaluation of the cholinomimetic actions of trimethylsulfonium, a compound present in the midgut gland of the sea hare Aplysia brasiliana (Gastropoda, Opisthobranchia)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english 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

C.M., Kerchove; R.P., Markus; J.C., Freitas; L.V., Costa-Lotufo.

362

Comparative histology and ultrastructure of the nidamental glands and egg masses of the Opisthobranchia (Mollusca, Gastropoda) : a functional and evolutionary approach  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In the present study the nidamental glands of 32 species of opisthobranchs, belonging to the "Cephalaspidea s. l.", Anaspidea, Sacoglossa, Tylodinoidea, Pleurobranchoidea and Nudibranchia and of five species from outgroup taxa (Pyramidelloidea, Pulmonata and Gymnomorpha) have been investigated histologically, histochemically and ultrastructurally. The egg masses of nineteen opisthobranch taxa and one pulmonate species have also been studied with the same techniques. Generally speaking, th...

Klussmann-kolb, Annette

1999-01-01

363

Phylogenetic analysis of Euthyneura (Gastropoda) by means of the 16S rRNA gene: use of a 'fast' gene for 'higher-level' phylogenies  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The phylogeny of Euthyneura is analysed by using DNA sequences of the mitochondrial 16S rRNA gene. Despite the common notion that this gene is too variable to provide useful information at high taxonomic levels, such as in the present study, bootstrap proportions are high for several clades in the study. This indicates that there is a useful amount of variation despite the noise due to multiple substitutions. The analyses furthermore indicate that (i) Gymnosomata (represented by Clione) is no...

Thollesson, M.

1999-01-01

364

Variation in radular teeth and acuspid side of the radula in Lacuna pallidula, L. parva and L. vincta (Gastropoda: Littorinidae) from the Isle of Wight, United Kingdom  

Science.gov (United States)

The variation in the radula of three species of Lacuna has been investigated and the back of the rachidian tooth is proposed as providing a new character set of potentially high taxonomic value. The term basal plate is introduced for the back of the rachidian tooth. Cusp and tooth morphology are closely related to diet and wear, and are subject to considerable homoplasy, whereas the structure of the basal plate of the rachidian tooth provides a more neutral character set. The difference in this character set between the lacunids has been quantified using seven measurements and the exploratory multivariate statistical procedure principal component analysis. The basal plate of the rachidian tooth showed interspecific differences. The taxonomic value of this new character set should be evaluated in further studies of other prosobranchs.

Jørgensen, Aslak

2001-01-01

365

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 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

2009-03-01

366

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)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese 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.

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