WorldWideScience

Sample records for opisthobranchia gastropoda mollusca

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

    OpenAIRE

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

    2012-01-01

    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...

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

    Science.gov (United States)

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

    2012-06-26

    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 rhythmic dorsal-ventral body flexions (DV). The phylogenetic distribution of these behaviors suggests a high degree of homoplasy. The central pattern generator (CPG) underlying DV swimming has been well characterized in Tritonia diomedea and in Pleurobranchaea californica. The CPG for LR swimming has been elucidated in Melibe leonina and Dendronotus iris, which are more closely related. The CPGs for the categorically distinct DV and LR swimming behaviors consist of nonoverlapping sets of homologous identified neurons, whereas the categorically similar behaviors share some homologous identified neurons, although the exact composition of neurons and synapses in the neural circuits differ. The roles played by homologous identified neurons in categorically distinct behaviors differ. However, homologous identified neurons also play different roles even in the swim CPGs of the two LR swimming species. Individual neurons can be multifunctional within a species. Some of those functions are shared across species, whereas others are not. The pattern of use and reuse of homologous neurons in various forms of swimming and other behaviors further demonstrates that the composition of neural circuits influences the evolution of behaviors. PMID:22723353

  3. Especies bentónicas de Opisthobranchia (Mollusca: Gastropoda presentes en el litoral del norte peruano

    Directory of Open Access Journals (Sweden)

    Katia Nakamura

    2013-05-01

    Full Text Available El presente trabajo muestra las especies bentónicas de Opisthobranchia registradas para el norte del Perú. El trabajo se basa en la recopilación de la literatura cientí?ca disponible para el área de interés. Se presentan las 17 especies reportadas para dicha zona, clasi?cadas dentro del Grupo Informal Opisthobranchia en 6 clados, 12 familias y 14 géneros. A pesar del alto potencial de diversidad que se le otorga a la costa norte peruana, el número de especies registradas es bajo, debido principalmente al escaso número de exploraciones e investigaciones realizadas.

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

    OpenAIRE

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

    2013-01-01

    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...

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

    OpenAIRE

    Wägele Heike; Klussmann-Kolb Annette

    2005-01-01

    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...

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

    Directory of Open Access Journals (Sweden)

    Wägele Heike

    2005-02-01

    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.

  7. Descriptions of three new species of Mitridae (Mollusca: Gastropoda) from South China Sea

    Science.gov (United States)

    Li, Baoquan; Zhang, Suping; Li, Xinzheng

    2005-03-01

    Three new species of Family Mitridae (Mollusca: Gastropoda) from the South China Sea are described in the present paper. They are Ziba aglais sp. nov. B. LI & S. ZHANg, Neocancilla daidaleosa sp. nov. B. LI & X. LI, and Mitra holkosa sp. nov. B. LI. Their systematic positions are also discussed.

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

    Czech Academy of Sciences Publication Activity Database

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

    2008-01-01

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

  9. Redescrição dos tipos de Veronicellidae (Mollusca, Gastropoda) neotropicais: X. Os tipos de Diplosolenodes occidentalis (Guilding, 1825) no British Museum (Natural History), Londres

    OpenAIRE

    José Willibaldo Thomé

    1984-01-01

    Diplosolenodes occidentalis (Guilding, 1825) (Mollusca, Gastropoda, Veronicellidae) is redescribed upon the examination of types in the British Museum (Natural History). New characters of external and internal morphohgy are described. A leclotype, is selected.

  10. From sea to land and beyond – New insights into the evolution of euthyneuran Gastropoda (Mollusca

    Directory of Open Access Journals (Sweden)

    Streit Bruno

    2008-02-01

    Full Text Available Abstract 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 and Bayesian inference methods. The evolution of colonization of freshwater and terrestrial habitats by pulmonate Euthyneura, considered crucial in the evolution of this group of Gastropoda, is reconstructed with Bayesian approaches. Results We found several well supported clades within Euthyneura, however, we could not confirm the traditional classification, since Pulmonata are paraphyletic and Opistobranchia are either polyphyletic or paraphyletic with several clades clearly distinguishable. Sacoglossa appear separately from the rest of the Opisthobranchia as sister taxon to basal Pulmonata. Within Pulmonata, Basommatophora are paraphyletic and Hygrophila and Eupulmonata form monophyletic clades. Pyramidelloidea are placed within Euthyneura rendering the Euthyneura paraphyletic. Conclusion Based on the current phylogeny, it can be proposed for the first time that invasion of freshwater by Pulmonata is a unique evolutionary event and has taken place directly from the marine environment via an aquatic pathway. The origin of colonisation of terrestrial habitats is seeded in marginal zones and has probably occurred via estuaries or semi-terrestrial habitats such as mangroves.

  11. Contribució a l’estudi dels mol·luscs terrestres (Mollusca, Gastropoda) del Parc de la Serralada Litoral (Barcelona)

    OpenAIRE

    Bros, V.

    2013-01-01

    Contribution to the study of terrestrial molluscs (Mollusca, Gastropoda) Serralada LitoralPark (Barcelona)The population of molluscs in Serralada Litoral Park (Barcelona, NE Iberian peninsula) was assessed, contributing to the conservation plan. A wildlife inventory was conducted based on fieldwork and literature. Gastropod communities in various natural environments and conchological species of interest for conservation are also described. Several environmental aspects that determine the dis...

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

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    Klussmann-Kolb Annette

    2010-01-01

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

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

    DEFF Research Database (Denmark)

    Kristof, Alen; Klussmann-Kolb, Annette

    2010-01-01

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

  14. Contribució a l’estudi dels mol·luscs terrestres (Mollusca, Gastropoda del Parc de la Serralada Litoral (Barcelona

    Directory of Open Access Journals (Sweden)

    Bros, V.

    2013-01-01

    Full Text Available Contribution to the study of terrestrial molluscs (Mollusca, Gastropoda Serralada LitoralPark (BarcelonaThe population of molluscs in Serralada Litoral Park (Barcelona, NE Iberian peninsula was assessed, contributing to the conservation plan. A wildlife inventory was conducted based on fieldwork and literature. Gastropod communities in various natural environments and conchological species of interest for conservation are also described. Several environmental aspects that determine the distribution and abundance of snails are discussed and management measures to meet their ecological requirements are suggested.

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

    Scientific Electronic Library Online (English)

    Zaidett, Barrientos Llosa.

    1165-11-01

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

  16. Biochemical profile of Achatina fulica (Mollusca: Gastropoda) after infection by different parasitic loads of Angiostrongylus cantonensis (Nematoda, Metastrongylidae).

    Science.gov (United States)

    Tunholi-Alves, Vinícius Menezes; Tunholi, Victor Menezes; Amaral, Ludimila Santos; Mota, Esther Maria; Maldonado Júnior, Arnaldo; Pinheiro, Jairo; Garcia, Juberlan

    2015-01-01

    The effect of experimental infection by different parasitic loads of Angiostrongylus cantonensis (Nematode, Metastrongylidae) on the activities of the aminotransferases and concentration of total proteins, uric acid and urea in the hemolymph of Achatina fulica (Mollusca, Gastropoda) were investigated. There was a significant decrease in the concentration of total proteins in the exposed snails to 5000 or more larvae. This change was accompanied by an increase in the concentrations of urea and uric acid in the hemolymph, suggesting a higher rate of deamination of the amino acids. Besides this, variations in the activities of the aminotransferases were also observed, with the highest values recorded in the groups exposed to greater parasite load. These results 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. Infection was verified by the fact that L3 larvae recovered from the snails was proportion to the exposure dose of L1 larvae. Histopathological results also indicated presence of an inflammatory cell infiltrate, favoring an increase of both transaminases. PMID:25308279

  17. Assessing metal contamination from construction and demolition (C&D) waste used to infill wetlands: using Deroceras reticulatum (Mollusca: Gastropoda).

    Science.gov (United States)

    Staunton, John A; Mc Donnell, Rory J; Gormally, Michael J; Williams, Chris D; Henry, Tiernan; Morrison, Liam

    2014-11-01

    Large quantities of construction and demolition waste (C&D) are produced globally every year, with little known about potential environmental impacts. In the present study, the slug, Deroceras reticulatum (Mollusca: Gastropoda) was used as the first biomonitor of metals (Ag, As, Ba, Cd, Co, Cr, Cu, Mn, Mo, Ni, Pb, Sb, Se, Ti, Tl, V and Zn) on wetlands post infilling with construction and demolition (C&D) waste. The bioaccumulation of As, Ba, Cd, Co, Sb, Se and Tl were found to be significantly elevated in slugs collected on C&D waste when compared to unimproved pastures (control sites), while Mo, Se and Sr had significantly higher concentrations in slugs collected on C&D waste when compared to known contaminated sites (mining locations), indicating the potential hazardous nature of C&D waste to biota. Identifying exact sources for these metals within the waste can be problematic, due to its heterogenic nature. Biomonitors are a useful tool for future monitoring and impact studies, facilitating policy makers and regulations in other countries regarding C&D waste infill. In addition, improving separation of C&D waste to allow increased reuse and recycling is likely to be effective in reducing the volume of waste being used as infill, subsequently decreasing potential metal contamination. PMID:25298023

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

    Czech Academy of Sciences Publication Activity Database

    Hlavá?, Jaroslav; Peltanová, A.

    2010-01-01

    Ro?. 9, - (2010), s. 11-15. ISSN 1336-6939 Institutional research plan: CEZ:AV0Z30130516 Keywords : Monacha cantiana * Hygromiidae * first record * distribution Subject RIV: EG - Zoology http://mollusca.sav.sk/pdf/9/9.Hlavac-Peltanova.pdf

  19. From sea to land and beyond – New insights into the evolution of euthyneuran Gastropoda (Mollusca)

    OpenAIRE

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

    2008-01-01

    Abstract 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 Like...

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

    Scientific Electronic Library Online (English)

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

    2003-06-01

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

  1. Annotated type catalogue of the Orthalicoidea (Mollusca, Gastropoda in the Museum für Naturkunde, Berlin

    Directory of Open Access Journals (Sweden)

    Abraham Breure

    2013-03-01

    Full Text Available The type status is described of 96 taxa classified within the superfamily Orthalicoidea and present in the Mollusca collection of the Museum für Naturkunde der Humboldt-Universität zu Berlin. Lectotypes are designated for the following taxa: Orthalicus elegans Rolle, 1895; Bulimus maranhonensis Albers, 1854; Orthalicus nobilis Rolle, 1895; Orthalichus tricinctus Martens, 1893. Orthalicus sphinx tresmariae is introduced as new name for Zebra sphinx turrita Strebel, 1909, not Z. quagga turrita Strebel, 1909. The following synonyms are established: Zebra crosseifischeri Strebel, 1909 = Orthalicus princeps fischeri Martens, 1893; Orthalicus isabellinus Martens, 1873 = O. bensoni (Reeve, 1849; Zebra zoniferus naesiotes Strebel, 1909 = Orthalicus undatus (Bruguière, 1789; Porphyrobaphe (Myiorthalicus dennisoni pallida Strebel, 1909 = Hemibulimus dennisoni (Reeve, 1848; Zebra delphinus pumilio Strebel, 1909 = Orthalicus delphinus (Strebel, 1909; Orthalicus (Laeorthalicus reginaeformis Strebel, 1909 = Corona perversa (Swainson, 1821; Bulimus (Eurytus corticosus Sowerby III, 1895 = Plekocheilus (Eurytus stuebeli Martens, 1885. The taxon Bulimus (Eudioptus psidii Martens, 1877 is now placed within the family Sagdidae, tentatively in the genus Platysuccinea. Appendices are included with an index to all the types of Orthalicoidea extant (including those listed by Köhler 2007 and a partial list of letters present in the correspondence archives.

  2. Thecosomata e Gymnosomata (Mollusca, Gastropoda da cadeia Fernando de Noronha, Brasil

    Directory of Open Access Journals (Sweden)

    Larrazábal Maria Eduarda de

    2003-01-01

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

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

    OpenAIRE

    Klussmann-kolb, Annette

    1999-01-01

    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...

  4. Konchologické nálezy (Mollusca: Gastropoda et Bivalvia) z ran? st?edov?kých objekt? v Žalov? u Prahy.

    Czech Academy of Sciences Publication Activity Database

    Hlavá?, Jaroslav

    Vol. 1. Praha : Archeologický ústav AV ?R, 2012 - (Tomková, K.), s. 342-347 ISBN 978-80-87365-48-9 R&D Projects: GA AV ?R IAAX00020701 Institutional research plan: CEZ:AV0Z30130516 Keywords : Middle Ages * Mollusca * cauri * molluscs Subject RIV: EG - Zoology

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

    International Nuclear Information System (INIS)

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

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

    Energy Technology Data Exchange (ETDEWEB)

    Sankurathri, C.S.; Holmes, J.C.

    1976-04-01

    Effects of thermal effluents on the population dynamics of Physa gyrina Say (Gastropoda; Pulmonata) were studied at Lake Wabamun, Alberta, from May 1971 to August 1973. Thermal effluent increased the rate of development of eggs and the growth of P. gyrina, and allowed continuous reproductive activity throughout the year. These changes, and the increased period of growth of aquatic macrophytes, resulted in increased population densities of P. gyrina in the heated area during summer. Temperatures below 10/sup 0/C or small amounts of vegetation appear to limit the population of P. gyrina in winter.

  7. The mitochondrial genome of Ifremeria nautilei and the phylogenetic position of the enigmatic deep-sea Abyssochrysoidea (Mollusca: Gastropoda).

    Science.gov (United States)

    Osca, David; Templado, José; Zardoya, Rafael

    2014-09-01

    The complete nucleotide sequence of the mitochondrial (mt) genome of the deep-sea vent snail Ifremeria nautilei (Gastropoda: Abyssochrysoidea) was determined. The double stranded circular molecule is 15,664 pb in length and encodes for the typical 37 metazoan mitochondrial genes. The gene arrangement of the Ifremeria mt genome is most similar to genome organization of caenogastropods and differs only on the relative position of the trnW gene. The deduced amino acid sequences of the mt protein coding genes of Ifremeria mt genome were aligned with orthologous sequences from representatives of the main lineages of gastropods and phylogenetic relationships were inferred. The reconstructed phylogeny supports that Ifremeria belongs to Caenogastropoda and that it is closely related to hypsogastropod superfamilies. Results were compared with a reconstructed nuclear-based phylogeny. Moreover, a relaxed molecular-clock timetree calibrated with fossils dated the divergence of Abyssochrysoidea in the Late Jurassic-Early Cretaceous indicating a relatively modern colonization of deep-sea environments by these snails. PMID:24967939

  8. Evolution der Cephalic Sensory Organs innerhalb der Opisthobranchia

    OpenAIRE

    Staubach, Sid

    2008-01-01

    Das Ziel der vorliegenden Doktorarbeit war es, die Evolution der Kopfsinnesorgane der Opisthobranchia zu rekonstruieren. Bei den Opisthobranchia handelt es sich um eine äußerst diverse Gruppe überwiegend mariner Gastropoden innerhalb der Euthyneura. Die Kopfsinnesorgane oder cephalic sensory organs (CSOs) weisen innerhalb der verschiedenen Großgruppen der Opisthobranchia eine sehr hohe morphologische Variabilität auf, und finden ihre Ausprägung in verschiedenen Formen von Labialtentakel...

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

    Scientific Electronic Library Online (English)

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

    2010-06-01

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

  10. Effects of thermal effluents on parasites and commensals of Physa gyrina Say (Mollusca: Gastropoda) and their interactions at Lake Wabamun, Alberta

    Energy Technology Data Exchange (ETDEWEB)

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

    1976-10-01

    Effects of thermal effluents on the dynamics of larval helminth parasites and on populations of limnaei haetogaster limnaei limnaei and Chaetogaster limnaei vaghini (Annelida; Oligochaeta) harbored by Physa gyrina (Mollusca: Pulmonata) were studied at Lake Wabamun, Alberta. Thermal effluents provided the necessary conditions to maintain digenean parasite transmission throughout the year between definitive and intermediate hosts, and increased the prevalence of certain parasites, especially the metacercarial stages. At temperatures above 24/sup 0/C prevalences of C. l. limnaei and C. l. vaghini decreased in the lake, and at these temperatures in the laboratory C. l. limnaei abandoned the snails and perished. Under experimental conditions the number of Echinoparyphium recurvatum larvae penetrated Physa gyrina was inversely related to the number of C. l. limnaei present. It was also observed that these oligochaetes actively ingested digenean larvae. Elimination of C. l. limnaei caused by thermal effluents has augmented the metacercarial infections. An ecological model depicting the interactions of Physa gyrina--digeneans--Chaetogaster l. limnaei is presented. This is a complex system in which water temperature acts as a main regulating factor. The three main components of the system interact with each other and are influenced by various external factors, resulting in a dynamic ecological system.

  11. Accumulation of cesium-137 by useful mollusca

    International Nuclear Information System (INIS)

    There are few data available on the radioactive contamination of marine mollusca, especially cephalopoda. Therefore, in this paper, data obtained on the radioactive contamination of cephalopoda were compared with those on pelecypoda and gastropoda. The uptake and elimination experiments were carried out by means of radioisotope tracer methods, and the concentration factors of 137Cs due to radioactive fallout were estimated. The contamination of cephalopoda was also compared with those of other marine organisms in terms of concentration factor. The activity ratios in the organs or tissues of octopus were in the range of 3.5 and 12.8 on the 14th day after the beginning of exposure and those of squid were in the range of 8.8 and 10.9 on the 6th day after the commencement of the experiment. The biological half time was 90 days for octopus from the observation over 75 days, while it was 31 days for clam from the results of 75 days' experiment. The concentration factors of 137Cs due to radioactive fallout were in the range of 3 and 23 for cephalopoda, 7 and 28 for pelecypoda and 24 and 30 for gastropoda, respectively. It was concluded that no difference in the concentration factors was clearly observable among the classes of mollusca, but the values were substantially similar to those of crustaceans and slightly lower than those of marine fish. (auth.)

  12. Metabolism of 60Co in mollusca

    International Nuclear Information System (INIS)

    After mollusca were bred in 60Co-labeled sea water or were given 60Co-labeled feed for certain hours, their tissues including the liver were removed as experimental samples. 60Co metabolism was observed by the Sephadex gel filtration profile. A gel chromatogram of the liver in gastropoda showed a marked peak of 60Co on the high-molecular side. Although the peak was observed on both high- and low-molecular sides in pelecypoda, it was more marked on the high-molecular side than on the low-molecular side. In cephalopoda, the peak pattern was similar to that in the other mollusca, but the proportion of low-molecular components was comparatively large. The gel filtration profile of 60Co in various tissues of cephalopoda revealed the incorporation of 60Co into the high-molecular components in blood, three peaks in the kidneys, and the incorporation of 60Co into the low-molecular components in the branchial heart. The metabolism of 60Co was dependent upon the chemical form of Co in gastropoda, and organic 60Co was specifically observed in the high-molecular components. (Namekawa, K.)

  13. FRESHWATER SNAILS (MOLLUSCA: GASTROPODA) OF NORTH AMERICA

    Science.gov (United States)

    Freshwater gastropod mollusks are represented in North America (north of Mexico) by 15 families, 78 genera and, as treated in this manual, 499 species. They are grouped into two large subclasses, the gill-breathing, operculated Prosobranchia and the lung-breathing, non-operculate...

  14. Molecular phylogenetics of Caenogastropoda (Gastropoda: Mollusca).

    Science.gov (United States)

    Colgan, D J; Ponder, W F; Beacham, E; Macaranas, J

    2007-03-01

    Caenogastropoda is the dominant group of marine gastropods in terms of species numbers, diversity of habit and habitat and ecological importance. This paper reports the first comprehensive multi-gene phylogenetic study of the group. Data were collected from up to six genes comprising parts of 18S rRNA, 28S rRNA (five segments), 12S rRNA, cytochrome c oxidase subunit I, histone H3 and elongation factor 1alpha. The alignment has a combined length of 3995 base positions for 36 taxa, comprising 29 Caenogastropoda representing all of its major lineages and seven outgroups. Maximum parsimony, maximum likelihood and Bayesian analyses were conducted. The results generally support monophyly of Caenogastropoda and Hypsogastropoda (Caenogastropoda excepting Architaenioglossa, Cerithioidea and Campanilioidea). Within Hypsogastropoda, maximum likelihood and Bayesian analyses identified a near basal clade of nine or 10 families lacking an anterior inhalant siphon, and Cerithiopsidae s.l. (representing Triphoroidea), where the siphon is probably derived independently from other Hypsogastropoda. The asiphonate family Eatoniellidae was usually included in the clade but was removed in one Bayesian analysis. Of the two other studied families lacking a siphon, the limpet-shaped Calyptraeidae was associated with this group in some analyses, but the tent-shaped Xenophoridae was generally associated with the siphonate Strombidae. The other studied hypsogastropods with an anterior inhalant siphon include nine families, six of which are Neogastropoda, the only traditional caenogastropod group above the superfamily-level with strong morphological support. The hypotheses that Neogastropoda are monophyletic and that the group occupies a derived position within Hypsogastropoda are both contradicted, but weakly, by the molecular analyses. Despite the addition of large amounts of new molecular data, many caenogastropod lineages remain poorly resolved or unresolved in the present analyses, possibly due to a rapid radiation of the Hypsogastropoda following the Permian-Triassic extinction during the early Mesozoic. PMID:17127080

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

    DEFF Research Database (Denmark)

    Cedhagen, Tomas

    1996-01-01

    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 “secondary test”, a cyst or covering of foreign particles around the test. This structure has earlier been called a “reproductive cyst” or “feeding cyst” in some species. “Secondary tests” 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.

  16. Phyllidia flava Aradas, 1847 (Mollusca Opisthobranchia), new record for the Azores

    OpenAIRE

    Hart, Justin; Wirtz, Peter

    2013-01-01

    Cervera et al. (2006) listed 113 opisthobranch species from the Azores. Since then, several additional coastal opisthobranchs have been reported from the Azores, e.g. Malaquias et al. (2011), Pedro et al. (2011), Cordeiro et al. (2013). We here report yet another previously unrecorded opisthobranch species from the Azores. The observations were made while SCUBA diving at Pico Island, Azores. Two specimens were deposited in the Zoologische Staatssammlung, München, Germany.

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

    Directory of Open Access Journals (Sweden)

    Liana K Jannotti-Passos

    2010-07-01

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

  18. Miocene Vetigastropoda and Neritimorpha (Mollusca, Gastropoda) of central Chile

    Science.gov (United States)

    Nielsen, Sven N.; Frassinetti, Daniel; Bandel, Klaus

    2004-09-01

    Species of Vetigastropoda (Fissurellidae, Turbinidae, Trochidae) and one species of Neritimorpha (Neritidae) from the Navidad area, south of Valpara?´so, and the Arauco Peninsula, south of Concepción, are described. Among these, the Fissurellidae comprise Diodora fragilis n. sp., Diodora pupuyana n. sp., two additional unnamed species of Diodora, and a species resembling Fissurellidea. Turbinidae are represented by Cantrainea sp., and Trochidae include Tegula (Chlorostoma) austropacifica n. sp., Tegula (Chlorostoma) chilena n. sp., Tegula (Chlorostoma) matanzensis n. sp., Tegula (Agathistoma) antiqua n. sp., Bathybembix mcleani n. sp., Gibbula poeppigii [Philippi, 1887] n. comb., Diloma miocenica n. sp., Fagnastesia venefica [Philippi, 1887] n. gen. n. comb., Fagnastesia matanzana n. gen. n. sp., Calliostoma mapucherum n. sp., Calliostoma kleppi n. sp., Calliostoma covacevichi n. sp., Astele laevis [Sowerby, 1846] n. comb., and Monilea riorapelensis n. sp. The Neritidae are represented by Nerita (Heminerita) chilensis [Philippi, 1887]. The new genus Fagnastesia is introduced to represent low-spired trochoideans with a sculpture of nodes below the suture, angulated whorls, and a wide umbilicus. This Miocene Chilean fauna includes genera that have lived at the coast and in shallow, relatively warm water or deeper, much cooler water. This composition therefore suggests that many of the Miocene formations along the central Chilean coast consist of displaced sediments. A comparison with different fossil and Recent faunas from around the Pacific and South America indicates that the vetigastropod and neritid fauna from the Miocene of Chile has only minor affinities with taxa living near New Zealand, Argentina, and the tropical eastern Pacific at that time.

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

    Scientific Electronic Library Online (English)

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

    2010-07-01

    Full Text Available 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.

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

    OpenAIRE

    Kristof, Alen; Klussmann-kolb, Annette

    2010-01-01

    Background: Studies on the development of the nervous system and the musculature of invertebrates have become more sophisticated and numerous within the last decade and have proven to provide new insights into the evolutionary history of organisms. In order to provide new morphogenetic data on opisthobranch gastropods we investigated the neuromuscular development in the nudibranch Aeolidiella stephanieae Valdez, 2005 using immunocytochemistry as well as F-actin labelling in conjunction with c...

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

    Scientific Electronic Library Online (English)

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

    1065-10-01

    Full Text Available 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.

  2. Keeping Nerves: Central Nervous System of the Interstitial Acochlidiid Parhedyle cryptophthalma (Gastropoda, Opisthobranchia)

    DEFF Research Database (Denmark)

    Joerger, Katharina; Kristof, Alen

    2008-01-01

    Unusually well-preserved fossils of a Halicyne-like cycloid crustacean frequently occur in the early Late Triassic lacustrine clay bed at Krasiejów in Opole Silesia, southern Poland. Its gill-like structures form a horseshoe-shaped pair of units composed of numerous calcified blades with reverse U-shaped cross-section. Originally, these were parallel slits opening on the ventral surface of the carapace. Lobation of the posterior margin of the carapace, of unusually large mature size for the group, make the animal different from other members of Halicynidae, and the new name Opolanka decorosa gen. et sp. nov. is proposed for it. More completely preserved specimens of cycloids from Vosges, France, and Madagascar show that the slit openings were located above radially arranged coxae of the walking appendages and a reduced abdomen. The disposition and arrangement of the cycloid gills suggest at least close analogy, and possibly homology, with the respiratory areas of the Branchiura, serving mostly as ion-exchangeorgans. It is proposed that they originated, in connection with the body size increase and adaptation to fresh-water environment, as radially arranged infoldings of the respiratory areas cuticle, with strongly calcified rigid dorsal parts suspended from the carapace. At least three ecologically and anatomically distinct lineages were represented in the order Cyclida, which was probably initially confined to marine environments and gradually adapted to life in continental waters. New taxa Schraminidae fam. nov. (with Schramine gen. nov.) and Americlidae fam. nov. (with Americlus gen. nov.) are proposed. J. Morphol., 2008. © 2008 Wiley-Liss, Inc.

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

    Energy Technology Data Exchange (ETDEWEB)

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

    2000-08-10

    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.

  4. The Cylindrobulla / Ascobulla complex-unraveling problems in identification and adding to Cylindrobulla diversity (Gastropoda, Heterobranchia, Sacoglossa) by describing a new species.

    Science.gov (United States)

    Laetz, Elise; Christa, Gregor; Händeler, Katharina; Wägele, Heike

    2014-01-01

    Sacoglossa (Gastropoda: Heterobranchia) are generally considered a monophyletic group, previously associated within the now defunct "Opisthobranchia", but now basally located within Panpulmonata. In the light of this new phylogenetic hypothesis, detailed knowledge of the most basal groups within Sacoglossa is of paramount importance. This study focuses on the genus Cylindrobulla, which is usually considered the most basal group within the Sacoglossa from a morphological point of view, because it does not share the typical elongate radula teeth of all other Sacoglossa. We describe a new species, Cylindrobulla schuppi sp. nov., and provide data on its food. We reexamined and clarify the radula of the type species C. beauii, review the genus with all other valid species, provide new characters to aid in the proper identification of species within this genus, compare it to the very similar genus Ascobulla, present a determination key using external characters to ensure proper identification of the two similar genera, and discuss phylogenetic relationships within the shelled sacoglossan, the Oxynoacea. PMID:25544526

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

    Scientific Electronic Library Online (English)

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

    2009-08-01

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

  6. Histomorfologia do órgão acessório de perfuração de Thais haemastoma (Mollusca, Gastropoda) / Histology of the accessory boring organ in Thais haemastoma (Mollusca, Gastropoda)

    Scientific Electronic Library Online (English)

    Ana Valêsca P., Lima; Inês X., Martins.

    2009-06-01

    Full Text Available Os representantes da família Thaididae são organismos predadores de outros moluscos, perfurando suas conchas pela ação alternada de secreção oriunda do "Accessory Boring Organ" (ABO) e por raspagem através da rádula. Nesta família, o ABO está localizado na porção ventral mediano-anterior do pé. Os a [...] nimais examinados neste estudo foram coletados na praia do Futuro, Fortaleza, em seguida levados ao laboratório para fixação e posterior tratamento histológico rotineiro. A porção glandular do ABO de Thais haemastoma (Linnaeus, 1758) se encontra alojada em uma cavidade circundada pela musculatura do pé e apresentando um ducto excretório que a comunica com o meio externo. Esta cavidade é revestida por um epitélio cilíndrico simples separando a porção glandular deste órgão do músculo pedioso, sendo contínuo com o epitélio de revestimento do ducto excretório. Subjacente a este tecido foi visualizado um tecido conjuntivo frouxo. A região glandular do ABO da espécie apresenta um formato discoidal com superfície irregular devido à presença de reentrâncias em direção à porção central da glândula. O epitélio glandular pseudoestratificado com células cilíndricas e ciliadas reagiu negativamente aos testes histoquímicos. Abaixo do epitélio, foi observado um tecido conjuntivo frouxo de sustentação. Abstract in english The mollusks of the family Thaididae are predators of others mollusks drilling their shell using alternately secretions from the accessory boring organ (ABO) and scraping movements of the radula. In this family the ABO is located in the median-anterior ventral part of the foot. The animals examined [...] in the study were collected in the "Praia do Futuro", Fortaleza, Ceará, Brazil. The glandular part of ABO in Thais haemastoma (Linnaeus, 1758) is located in a cavity inside the foot, surrounded by foot muscle, and shows an excretory duct connecting that glandular portion to the outside. The analysis of microscopic sections stained by eosin-hematoxylin showed an epithelial tissue lining the cavity, and separating the glandular portion of ABO from the foot muscle. This ephitelial tissue is continuous with the excretory duct ephitelium. Under this tissue was observed a loose connective tissue. The ABO gland of T. haemastoma has a discoidal format and an irregular surface due to the presence of reentrances heading to the central part of the gland. The pseudoestratificated glandular epithelium with cylindrical and ciliated cells reacted negatively to the histochemical tests. Under the epithelium a connective loose tissue of support was observed.

  7. 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

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    DAVID VELIZ

    2000-12-01

    Full Text Available Este estudio describe la diversidad, y la distribución latitudinal y batimétrica de los caracoles de la Familia Trochidae en el norte de Chile, mediante muestreos intermareales y submareales someros, realizados entre 1996 y 1999 entre Arica (18º S y Los Vilos (31º S, y de muestras de profundidad 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

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

    Scientific Electronic Library Online (English)

    DAVID, VELIZ; JULIO A, VASQUEZ.

    2000-12-01

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

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

    Scientific Electronic Library Online (English)

    Eduardo, Colley.

    2012-03-01

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

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

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    Arnaldo C. dos Santos Coelho

    1989-01-01

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

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

    Scientific Electronic Library Online (English)

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

    2011-04-01

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

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

    Scientific Electronic Library Online (English)

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

    2011-08-01

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

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

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    Oscar Efraín Holguin Quiñones

    2008-09-01

    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.

  14. 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)

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

    1189-11-01

    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.

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

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    C.M. Kerchove

    2002-04-01

    Full Text Available Trimethylsulfonium, a compound present in the midgut gland of the sea hare Aplysia brasiliana, negatively modulates vagal response, indicating a probable ability to inhibit cholinergic responses. In the present study, the pharmacological profile of trimethylsulfonium was characterized on muscarinic and nicotinic acetylcholine receptors. In rat jejunum the contractile response induced by trimethylsulfonium (pD2 = 2.46 ± 0.12 and maximal response = 2.14 ± 0.32 g was not antagonized competitively by atropine. The maximal response (Emax to trimethylsulfonium was diminished in the presence of increasing doses of atropine (P<0.05, suggesting that trimethylsulfonium-induced contraction was not related to muscarinic stimulation, but might be caused by acetylcholine release due to presynaptic stimulation. Trimethylsulfonium displaced [³H]-quinuclidinyl benzilate from rat cortex membranes with a low affinity (Ki = 0.5 mM. Furthermore, it caused contraction of frog rectus abdominis muscles (pD2 = 2.70 ± 0.06 and Emax = 4.16 ± 0.9 g, which was competitively antagonized by d-tubocurarine (1, 3 or 10 µM with a pA2 of 5.79, suggesting a positive interaction with nicotinic receptors. In fact, trimethylsulfonium displaced [³H]-nicotine from rat diaphragm muscle membranes with a Ki of 27.1 µM. These results suggest that trimethylsulfonium acts as an agonist on nicotinic receptors, and thus contracts frog skeletal rectus abdominis muscle and rat jejunum smooth muscle via stimulation of postjunctional and neuronal prejunctional nicotinic cholinoreceptors, respectively.

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

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    J. Paulo Cabral

    2007-03-01

    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.

  17. DNA barcoding reveals neritid diversity (Mollusca: Gastropoda) diversity in Malaysian waters.

    Science.gov (United States)

    Chee, S Y; Mohd Nor, Siti Azizah

    2014-12-01

    Abstract This is the first study to identify and determine the phylogenetics of neritids found in Malaysia. In total, twelve species from the family Neritidae were recorded. Ten species were from the genus Nerita and two species were from the genus Neritina. DNA barcodes were successfully assigned to each species. Although some of these species were previously reported in the region, three are only presently reported in this study. The dendrogram showed Nerita and Neritina strongly supported in their respective monophyletic clades. Phylogenetic positions of some species appeared unstable in the trees. This could be due to the differences in a small number of nucleotides, thus minimizing genetic variation between each specimen and species. PMID:25471442

  18. Ten new complete mitochondrial genomes of pulmonates (Mollusca: Gastropoda and their impact on phylogenetic relationships

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    de Frias Martins António

    2011-10-01

    Full Text Available Abstract Background Reconstructing the higher relationships of pulmonate gastropods has been difficult. The use of morphology is problematic due to high homoplasy. Molecular studies have suffered from low taxon sampling. Forty-eight complete mitochondrial genomes are available for gastropods, ten of which are pulmonates. Here are presented the new complete mitochondrial genomes of the ten following species of pulmonates: Salinator rhamphidia (Amphiboloidea; Auriculinella bidentata, Myosotella myosotis, Ovatella vulcani, and Pedipes pedipes (Ellobiidae; Peronia peronii (Onchidiidae; Siphonaria gigas (Siphonariidae; Succinea putris (Stylommatophora; Trimusculus reticulatus (Trimusculidae; and Rhopalocaulis grandidieri (Veronicellidae. Also, 94 new pulmonate-specific primers across the entire mitochondrial genome are provided, which were designed for amplifying entire mitochondrial genomes through short reactions and closing gaps after shotgun sequencing. Results The structural features of the 10 new mitochondrial genomes are provided. All genomes share similar gene orders. Phylogenetic analyses were performed including the 10 new genomes and 17 genomes from Genbank (outgroups, opisthobranchs, and other pulmonates. Bayesian Inference and Maximum Likelihood analyses, based on the concatenated amino-acid sequences of the 13 protein-coding genes, produced the same topology. The pulmonates are paraphyletic and basal to the opisthobranchs that are monophyletic at the tip of the tree. Siphonaria, traditionally regarded as a basal pulmonate, is nested within opisthobranchs. Pyramidella, traditionally regarded as a basal (non-euthyneuran heterobranch, is nested within pulmonates. Several hypotheses are rejected, such as the Systellommatophora, Geophila, and Eupulmonata. The Ellobiidae is polyphyletic, but the false limpet Trimusculus reticulatus is closely related to some ellobiids. Conclusions Despite recent efforts for increasing the taxon sampling in euthyneuran (opisthobranchs and pulmonates molecular phylogenies, several of the deeper nodes are still uncertain, because of low support values as well as some incongruence between analyses based on complete mitochondrial genomes and those based on individual genes (18S, 28S, 16S, CO1. Additional complete genomes are needed for pulmonates (especially for Williamia, Otina, and Smeagol, as well as basal heterobranchs closely related to euthyneurans. Increasing the number of markers for gastropod (and more broadly mollusk phylogenetics also is necessary in order to resolve some of the deeper nodes -although clearly not an easy task. Step by step, however, new relationships are being unveiled, such as the close relationships between the false limpet Trimusculus and ellobiids, the nesting of pyramidelloids within pulmonates, and the close relationships of Siphonaria to sacoglossan opisthobranchs. The additional genomes presented here show that some species share an identical mitochondrial gene order due to convergence.

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

    OpenAIRE

    Cledo?n, Maximiliano

    2004-01-01

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

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

    OpenAIRE

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

    2012-01-01

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

  1. Gastrocopta (Mollusca, Gastropoda, Pupillidae) in the Pilbara region of Western Australia.

    Science.gov (United States)

    Whisson, Corey S; Köhler, Frank

    2013-01-01

    Six species of Gastrocopta have been identified from the Pilbara region, Western Australia, by means of comparative analyses of shell and mtDNA variation. Three of these species, Gastrocopta hedleyi, Gastrocopta larapinta and Gastrocopta servilis, have been recorded in the Pilbara for the first time. Gastrocopta sp. CW1 is probably new to science and might be endemic to the region. By contrast, Gastrocopta hedleyi, Gastrocopta larapinta and Gastrocopta mussoni are shown to be widespread. PMID:23653507

  2. Gastrocopta (Mollusca, Gastropoda, Pupillidae) in the Pilbara region of Western Australia

    OpenAIRE

    Corey Whisson; Frank Köhler

    2013-01-01

    Six species of Gastrocopta have been identified from the Pilbara region, Western Australia, by means of comparative analyses of shell and mtDNA variation. Three of these species, Gastrocopta hedleyi, Gastrocopta larapinta and Gastrocopta servilis, have been recorded in the Pilbara for the first time. Gastrocopta sp. CW1 is probably new to science and might be endemic to the region. By contrast, Gastrocopta hedleyi, Gastrocopta larapinta and Gastrocopta mussoni are shown to be widespread.

  3. Gastrocopta (Mollusca, Gastropoda, Pupillidae in the Pilbara region of Western Australia

    Directory of Open Access Journals (Sweden)

    Corey Whisson

    2013-01-01

    Full Text Available Six species of Gastrocopta have been identified from the Pilbara region, Western Australia, by means of comparative analyses of shell and mtDNA variation. Three of these species, G. hedleyi, G. larapinta and G. servilis, have been recorded in the Pilbara for the first time. Gastrocopta sp. CW1 is probably new to science and might be endemic to the region. By contrast, G. hedleyi, G. larapinta and G. mussoni are shown to be widespread.

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

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    Janine Oliveira Arruda

    2011-12-01

    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.

  5. Unusual Micrometric Calcite-Aragonite Interface in the Abalone Shell Haliotis (Mollusca, Gastropoda)

    OpenAIRE

    Dauphin, Yannicke; Cuif, Jean-pierre; Castillo-michel, Hiram; Chevallard, Corinne; Farre, Bastien; Meibom, Anders

    2014-01-01

    Species of Haliotis ~abalone! show high variety in structure and mineralogy of the shell. One of the European species ~Haliotis tuberculata! in particular has an unusual shell structure in which calcite and aragonite coexist at a microscale with small patches of aragonite embedded in larger calcitic zones. A detailed examination of the boundary between calcite and aragonite using analytical microscopies shows that the organic contents of calcite and aragonite differ. Moreover, changes in th...

  6. Unusual micrometric calcite-aragonite interface in the abalone shell Haliotis (Mollusca, Gastropoda).

    Science.gov (United States)

    Dauphin, Yannicke; Cuif, Jean-Pierre; Castillo-Michel, Hiram; Chevallard, Corinne; Farre, Bastien; Meibom, Anders

    2014-02-01

    Species of Haliotis (abalone) show high variety in structure and mineralogy of the shell. One of the European species (Haliotis tuberculata) in particular has an unusual shell structure in which calcite and aragonite coexist at a microscale with small patches of aragonite embedded in larger calcitic zones. A detailed examination of the boundary between calcite and aragonite using analytical microscopies shows that the organic contents of calcite and aragonite differ. Moreover, changes in the chemical composition of the two minerals seem to be gradual and define a micrometric zone of transition between the two main layers. A similar transition zone has been observed between the layers in more classical and regularly structured mollusk shells. The imbrication of microscopic patches of aragonite within a calcitic zone suggests the occurrence of very fast physiological changes in these taxa. PMID:24188740

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

    Science.gov (United States)

    Monteiro, J C; Coelho, A C S

    2002-02-01

    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 differential 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. PMID:12185913

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

    OpenAIRE

    Rl, Martins-sousa; Negrão-Corrêa D; Fsm, Bezerra; Pmz, Coelho

    2001-01-01

    The anesthetic effect of some water-soluble anesthesic or narcotic drugs currently used in mice was tested in molluscs of the Biomphalaria genus. Sodium thiopental was very toxic to the snails resulting in high rates of mortality in all the treatment schedules tested. Cetamine base, at concentration of 0.25 mg/ml of water, resulted in partial snail anesthesia (40% of snails were anesthetized) only after 20 h of exposition. The association of Cetamine base with Tiazine chloridrate did not impr...

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

    Science.gov (United States)

    Martins-Sousa, R; Negrão-Corrêa, D; Bezerra, F; Coelho, P

    2001-04-01

    The anesthetic effect of some water-soluble anesthesic or narcotic drugs currently used in mice was tested in molluscs of the Biomphalaria genus. Sodium thiopental was very toxic to the snails resulting in high rates of mortality in all the treatment schedules tested. Cetamine base, at concentration of 0.25 mg/ml of water, resulted in partial snail anesthesia (40% of snails were anesthetized) only after 20 h of exposition. The association of Cetamine base with Tiazine chloridrate did not improve the anesthesic effect, and higher concentrations of these drugs were toxic to the snails. Sodium pentobarbital at 0.4 mg/ml in water for 8 h was the best treatment schedule to anesthetize Biomphalaria snails. In this schedule, the snails were anesthetized without any toxic effect. The procedure provides a powerful tool for in vivo studies that demande a complete state of snail anesthesia. PMID:11313650

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

    Directory of Open Access Journals (Sweden)

    Eliana de Fátima Marques de Mesquita

    1990-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Eliana de Fátima Marques de Mesquita

    1990-01-01

    Full Text Available In this paper the authors give an anatomical and histological analysis of the 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.

  12. 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)

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

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    Olivier Gargominy

    2006-01-01

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

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

    Science.gov (United States)

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

    2007-10-01

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

  15. Mitochondrial genome of the endangered marine gastropod Strombus gigas Linnaeus, 1758 (Mollusca: Gastropoda).

    Science.gov (United States)

    Márquez, Edna J; Castro, Erick R; Alzate, Juan F

    2014-09-01

    Abstract The queen conch Strombus gigas is an endangered marine gastropod of significant economic importance across the Greater Caribbean region. This work reports for the first time the complete mitochondrial genome of S. gigas, obtained by FLX 454 pyrosequencing. The mtDNA genome encodes for 13 proteins, 22 tRNAs and 2 ribosomal RNAs. In addition, the coding sequences and gene synteny were similar to other previously reported mitogenomes of gastropods. PMID:25186797

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

    Directory of Open Access Journals (Sweden)

    Marlene T. Ueta

    1980-12-01

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

  17. Induction of larval settlement and metamorphosis of Haliotis discus hannai Ino (Gastropoda, Mollusca)

    Science.gov (United States)

    Yang, Yu; Wu, Bao-Ling

    1995-03-01

    Conspecific foot mucus, excessive [K+] and gamma-aminobutyric acid (GABA) showed different metamorphosis-inductive effect on the veliger of Haliotis discus hannai. The inductive effect of excessive [K+] and GABA was developmental stage-dependent and dose-dependent, while that of conspecific foot mucus was only developmental stage-dependent. At 20°C the veliger larvae became competent within 4 days after fertilization. H. discus hannai larvae showed gregarious settlement pattern on the conspecific foot mucus under the conditions of either presence or absence of KCl or GABA. The present studies showed that the effect of conspecific foot mucus on abalone larvae metamorphosis could be dose-independent.

  18. A new Middle Miocene Niveria Jousseaume, 1884 (Mollusca: Gastropoda: Trivioidea) from Hungary

    Science.gov (United States)

    Fehse, Dirk

    2011-02-01

    A new species of Niveria from the Middle Miocene (Badenian) of the Paratethys of Borsodbóta, Hungary is described. This species is characterized by its callused dorsum and dorsal depression. Niveria jozefgregoi sp. nov. is discussed with comparative species from the Badenian of Hungary, the Pliocene of the Mediterranean region, Florida and Recent species from Madeira and the Islas Galápagos.

  19. Rich and rare—First insights into species diversity and abundance of Antarctic abyssal Gastropoda (Mollusca)

    Science.gov (United States)

    Schwabe, Enrico; Michael Bohn, Jens; Engl, Winfried; Linse, Katrin; Schrödl, Michael

    2007-08-01

    The abyssal depths of the polar oceans are thought to be low in diversity compared with the shallower polar shelves and temperate and tropical deep-sea basins. Our recent study on the gastropod fauna of the deep Southern Ocean gives evidence of the existence of a rich gastropod assemblage at abyssal depths. During the ANDEEP I and II expeditions to the southern Drake Passage, Northwestern Weddell Sea, and South Sandwich Trench, gastropods were collected by bottom and Agassiz trawls, epibenthic sledge, and multicorer, at 40 stations in depths between 127 and 5194 m. On the whole, 473 specimens, corresponding to 93 species of 36 families, were obtained. Of those, 414 specimens were caught below 750 m depth and refer to 84 (90%) benthic species of 32 (89%) families. Most families were represented by a single species only. The numerically dominant families were Skeneidae and Buccinidae (with 10 and 11 species, respectively), Eulimidae and Trochidae (with 9 species each), and Turridae (6 species). Thirty-Seven benthic deep-sea species (44%) were represented by a single specimen, and another 20 species (24%) were found at a single station, suggesting that more than two thirds of Antarctic deep-sea gastropod species are very rare or have a very scattered distribution. Of the 27 species occurring at two or more deep-sea stations, 14 were collected with different gear. Approximately half of the deep-water species are new to science or have been recently described. The present investigation increases the total number of recorded benthic Antarctic deep-sea gastropods (below 750 m) from 115 to 177. The previously known depth ranges have been extended, often considerably, for 31 species. The collected deep-sea gastropods comprise both eurybathic shelf species (29%) and apparently true deep-sea species (58%); some of the latter may belong to a so far unknown Antarctic abyssal fauna. Geographical ranges of the collected Antarctic benthic deep-sea gastropod species appear limited, and all these 84 species seem endemic to Antarctica south of the Polar Front. Comparing diversity and abundances based on epibenthic sledge samples, there is no clear relationship between Antarctic deep-sea gastropod abundance and species richness with depth. However, both Antarctic and adjacent deep-sea areas are still far from being adequately sampled to allow more comprehensive conclusions.

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

    International Nuclear Information System (INIS)

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

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

    Directory of Open Access Journals (Sweden)

    Marcelo de Oliveira Soares

    2010-08-01

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

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

    OpenAIRE

    Klussmann-Kolb Annette; Kristof Alen

    2010-01-01

    Abstract Background Studies on the development of the nervous system and the musculature of invertebrates have become more sophisticated and numerous within the last decade and have proven to provide new insights into the evolutionary history of organisms. In order to provide new morphogenetic data on opisthobranch gastropods we investigated the neuromuscular development in the nudibranch Aeolidiella stephanieae Valdéz, 2005 using immunocytochemistry as well as F-actin labelling in conjuncti...

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

    International Nuclear Information System (INIS)

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

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

    Scientific Electronic Library Online (English)

    RL, Martins-Sousa; D, Negrão-Corrêa; FSM, Bezerra; PMZ, Coelho.

    2001-04-01

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

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

    Directory of Open Access Journals (Sweden)

    RL Martins-Sousa

    2001-04-01

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

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

    OpenAIRE

    Monteiro, J. C.; Coelho, A. C. S.

    2002-01-01

    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.

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

    Directory of Open Access Journals (Sweden)

    Dilian Georgiev

    2011-02-01

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

  8. N-acetylmuramic acid in Mollusca Gastropoda: a histochemical and immunocytochemical study.

    Science.gov (United States)

    Fantin, A M; Ottaviani, E

    1990-09-01

    The presence of N-acetylmuramic acid in glycoconjugates in various mollusc tissues was investigated by histochemical and immunocytochemical techniques. The tissues studied included foot, mantle, digestive gland, ganglia and haemocytes of Helix aspersa, Planorbarius corneus, Murex brandaris and Trunculariposis trunculus. Sialic acid residues were found to be absent. The possibility that N-acetylmuramic acid replaces sialic acid in acid glycoconjugates of gastropods with similar properties is discussed. PMID:1702086

  9. Registro de Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda no Brasil: caramujo hospedeiro intermediário da angiostrongilíase

    Directory of Open Access Journals (Sweden)

    Santana Teles Horácio Manuel

    1997-01-01

    Full Text Available A introdução de Achatina fulica é assinalada em Itariri, SP, Brasil. Essa espécie de caramujo terrestre foi importada para cultivo, visando à comercialização para consumo humano como "escargot". O encontro de exemplares em vida livre mostra a dispersão de A. fulica e, conseqüentemente, o risco de transmissão de Angiostrongylus cantonensis, nematóide parasita do homem e de outros vertebrados. Além disso, o caramujo é uma praga importante da agricultura.

  10. [Occurrence of Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda) in Brazil: intermediate snail host of angiostrongyliasis].

    Science.gov (United States)

    Teles, H M; Vaz, J F; Fontes, L R; Domingos, M de F

    1997-06-01

    Achatina fulica, the intermediate snail host of angiostrongyliasis and also an agricultural pest, is being bred in Brazil for human consumption as "escargot". The snail has escaped from its artificial breeding sites and its dispersal in Itariri country, State of S. Paulo, is reported here for the first time. A. fulica is a transmitter of the rat lungworm Angiostrongylus cantonensis, nematode which causes meningoencephalic angiostrongyliasis; the risks of human contamination are commented on. PMID:9515269

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

    DEFF Research Database (Denmark)

    Lützen, JØrgen; Faasse, Marco

    2012-01-01

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

  12. New Mediterranean Biodiversity Records (June 2012)

    OpenAIRE

    Nicolaidou, A.; Alongi, G.; Aydogan, O?; Catra, M.; Cavas, L.; Cevik, C.; Dosi, A.; Circosta, V.; Giakoumi, S.; Gime?nez Casalduero, Francisca; Filiz, H.; Izquierdo Mun?oz, Andre?s; Kalogirou, S.; Konstantinidis, E.; Kousteni, V.

    2012-01-01

    The present work reports on the extended distribution of nineteen species in the Mediterranean. These are: Upeneus pori (Fish:Turkey), Bursatella leachii (Mollusca, Opisthobranchia: eastern coast of Spain), Sparisoma cretense (Fish: Ionian coast of Greece), Pseudobryopsis myura (Chlorophyta:Turkey), Aplysia dactylomela (Mollusca, Opisthobranchia: Karpathos island, and Kyklades Archipelago, Greece), Asparagopsis armata and Botryocladia madagascariensis (Rhodophyta: South Peloponnesos, Greece),...

  13. Defense in the aeolidoidean genus Phyllodesmium (Gastropoda).

    Science.gov (United States)

    Bogdanov, Alexander; Kehraus, Stefan; Bleidissel, Sabrina; Preisfeld, Gela; Schillo, Dorothee; Piel, Jörn; Brachmann, Alexander O; Wägele, Heike; König, Gabriele M

    2014-09-01

    The genus Phyllodesmium (Aeolidoidea, Gastropoda) comprises shell-less marine snails, whose defense strategies are not well investigated yet. Here we report results of the first chemical investigation of P. briareum, as well as a re-investigation of P. longicirrum and P. magnum. Briarane diterpenes were isolated from P. briareum, and their origin could be traced to its prey organism Briareum sp. (Octocorallia). Considerable enrichment of the soft coral secondary metabolites in the slug was shown. Re-investigation of P. magnum led to isolation of cembrane diterpenes, 2-phenylethylamide, and furano sesquiterpenes. Sequestration of chemicals seems to have influenced speciation and evolution of Phyllodesmium species. Structural similarity or dissimilarity of particular slug metabolites suggests a closer, or more distant relationship of the respective Phyllodesmium taxa. PMID:25244950

  14. Adiciones a los Gastropoda del mar peruano / Additions to Gastropoda from the Peruvian sea

    Scientific Electronic Library Online (English)

    Carlos, Paredes; Franz, Cardoso; Paul, Baltazar; Katherine, Altamirano; Patricia, Carbajal.

    2011-04-01

    Full Text Available SciELO Peru | Language: Spanish Abstract in spanish Se reportan por primera vez para el mar peruano seis especies de gasterópodos: Sthenorytis turbinus Dall, 1908, Crucibulum (Crucibulum) umbrella (Deshayes, 1830), Favartia (Murexiella) lappa (Broderip,1833), Cantharus (Cantharus) shaskyi Berry, 1959, Cantharus (Solenosteira) macrospira (Berry, 1957) [...] , Cancellaria (Bivetopsia) haemastoma Sowerby, 1832. Se informa sobre la distribución, el hábitat y comentarios relevantes acerca de cada una de las especies. Abstract in english The following species of Gastropoda are recorded for the first time for Peruvian waters: Sthenorytis turbinus Dall, 1908, Crucibulum (Crucibulum) umbrella (Deshayes, 1830), Favartia (Murexiella) lappa (Broderip,1833), Cantharus (Cantharus) shaskyi Berry, 1959, Cantharus (Solenosteira) macrospira (Be [...] rry, 1957), Cancellaria (Bivetopsia) haemastoma Sowerby, 1832.

  15. 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

    OpenAIRE

    Sônia Barbosa dos Santos; Daniele Pedrosa Monteiro; Mônica Ammon Fernandez; Silvaria Carvalho Thiengo

    1999-01-01

    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).

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

    Directory of Open Access Journals (Sweden)

    Ana Maria Leal-Zanchet

    1993-01-01

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

  17. Distribution of pteropods (Mollusca: Gastropoda: Thecosomata) in surface waters (0-100 m) of the Western Caribbean Sea (winter, 2007) / Distribución de pterópodos (Mollusca: Gastropoda: Thecosomata) en aguas superficiales (0-100 m) del Mar Caribe Occidental (invierno, 2007)

    Scientific Electronic Library Online (English)

    Ana, Parra-Flores; Rebeca, Gasca.

    2009-12-01

    Full Text Available El principal objetivo de este estudio fue conocer la distribución vertical y horizontal de los pterópodos tecosomados en la capa superior de los 100 m del Mar Caribe occidental. El zooplancton fue recolectado en 60 estaciones durante enero 2007 en intervalos de profundidad de 25 m desde la superfici [...] e a 100 m. La comunidad fue analizada en términos de diversidad, equidad, riqueza y similitud. Encontramos 36 taxa de los que 12 son nuevos registros para el Caribe occidental. Los taxa más abundantes fueron Limacina inflata, L. trochiformis, Creseis acicula f. clava, Cuvierina columnella atlantica y Hyalocylis striata. En general, mostraron un mismo patrón, sus mayores abundancias ocurrieron consistentemente en el estrato 0-25 m de día y noche; la abundancia decrece con la profundidad. Se encontraron diferencias significativas día/noche en composición y abundancia, no así entre estratos. El estrato de 0-25 m contiene los mayores valores de riqueza, diversidad y abundancia de pterópodos, lo que representa un hallazgo sin precedente respecto a estudios previos. La estructura de la comunidad local está determinada en gran medida por las migraciones verticales día/noche. Los pterópodos tendieron a ser más abundantes en los sectores norte y sur del área, pero su mayor diversidad y riqueza se registró en el sector central. La baja variabilidad de las condiciones hidrográficas y la mezcla horizontal de los grupos generados por el análisis de similitud sugieren que los patrones migratorios día/noche explican la variabilidad observada en la comunidad de pterópodos. Abstract in english The main goal of this survey was to study the vertical and horizontal distribution of the thecosome pteropods in the upper 100 m of the western Caribbean Sea. Zooplankton was collected at 60 stations in January 2007 at stratified depth intervals of 25 m from the surface to 100 m. The community was a [...] nalyzed for diversity, evenness, species richness, and similarity. We recorded 36 taxa 12 of which are new records for the western Caribbean. The most abundant taxa were Limacina inflata, L. trochiformis, Creseis acicula f. clava, Cuvierina columnella atlantica, and Hyalocylis striata. In general, these taxa showed a similar pattern, their highest abundances occurred consistently in 0-25 m layer in both night and day samples; abundance decreased with depth. Significant day/night differences were found in the composition and abundance of pteropods, differences among depth intervals were non-significant. Our results showed that the upper 25 m harbored the highest species richness, diversity, and vertical abundance of pteropods, thus providing unprecedented detail with respect to previous surveys. The local community structure of the pteropods is determined largely by vertical day/night migrations. Pteropods tended to be most abundant in the southern and northern sectors of the area, but highest diversity and species richness were recorded in the central sector. Overall, the low variability of the hydrographic conditions and the mixed horizontal distribution of the clusters from the similarity analysis suggest that day/night migratory patterns of the most abundant taxa are determinant of the observed variability of the pteropod community.

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

    Scientific Electronic Library Online (English)

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

    2014-12-01

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

  19. Sistema reprodutor de Gundlachia concentrica (Orbigny) e Gundlachia moricandi (Orbigny), como subsídio para a taxonomia de Ancylidae (Mollusca, Gastropoda, Pulmonata) / Reproductive system of Gundlachia concentrica (Orbigny) and Gundlachia moricandi (Orbigny), as subsidy for the taxonomy of Ancylidae (Mollusca, Gastropoda, Pulmonata)

    Scientific Electronic Library Online (English)

    Fernanda Pires, Ohlweiler; Inga Ludmila, Veitenheimer-Mendes.

    1995-09-01

    Full Text Available [...] Abstract in english The reproductive system of Gundlachia concentrica (Orbigny, 1835) and Gundlachia moricandi (Orbigny, 1837) are described. The following structures distinguished the specimens of those species: ovotestis, seminal vesicle, tubular prolongation of dorsoposterior region of uterus and duet of the copulat [...] ion pouch.

  20. 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)

    OpenAIRE

    Cândido Simões Ferreira; Dos Santos Coelho, Arnaldo C.

    1989-01-01

    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.

  1. 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

    Directory of Open Access Journals (Sweden)

    J. C. MONTEIRO

    2002-02-01

    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.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 ocular, glândulas hipobranquiais, mandíbulas, rádulas e ceco espiral do estômago, fornecendo um número maior de dados que poderão auxiliar em estudos taxonômicos.

  2. 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)

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

    2002-02-01

    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.

  3. Anatomia e microanatomia do sistema reprodutor de Rectartemon (Rectartemon) depressus (Heynemann) (Mollusca, Gastropoda, Streptaxidae): complexo fálico / Anatomy and microanatomy of the reproductive system of Rectartemon (Rectartemon) depressus (Heynemann) (Mollusca, Gastropoda, Streptaxidae): the phallus complex

    Scientific Electronic Library Online (English)

    Mônica, Picoral; José Willibaldo, Thomé.

    Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] Abstract in english It is described the anatomy and microanatomy of the phallus complex of Rectartemon depressus (Heynemann, 1868). The complex is composed by a phallus, a diverticle of the phallus and an epiphallus, where the deferens duct is thrown in: the retractor muscle is splitted in two parts, inserted into the [...] region of the epiphallus through a smaller branch, and at the extremity of the diverticle, through a longer and thiner branch. The lumen of the phallus, epiphallus and diverticle have corrugations and thorns. On the phallus the thorns are arranged in a protuberance and disposed alternately in rows, ali with an aculeus form and with a chestnut collor point and a yellow basis.

  4. Anatomia e microanatomia do sistema reprodutor de Rectartemon (Rectartemon depressus (Heynemann (Mollusca, Gastropoda, Streptaxidae: complexo fálico Anatomy and microanatomy of the reproductive system of Rectartemon (Rectartemon depressus (Heynemann (Mollusca, Gastropoda, Streptaxidae: the phallus complex

    Directory of Open Access Journals (Sweden)

    Mônica Picoral

    1998-01-01

    Full Text Available It is described the anatomy and microanatomy of the phallus complex of Rectartemon depressus (Heynemann, 1868. The complex is composed by a phallus, a diverticle of the phallus and an epiphallus, where the deferens duct is thrown in: the retractor muscle is splitted in two parts, inserted into the region of the epiphallus through a smaller branch, and at the extremity of the diverticle, through a longer and thiner branch. The lumen of the phallus, epiphallus and diverticle have corrugations and thorns. On the phallus the thorns are arranged in a protuberance and disposed alternately in rows, ali with an aculeus form and with a chestnut collor point and a yellow basis.

  5. 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)

    Cândido Simões Ferreira

    1989-01-01

    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.

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

    Scientific Electronic Library Online (English)

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

    2013-09-01

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

  7. 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

    Scientific Electronic Library Online (English)

    Sônia Barbosa dos, Santos; Daniele Pedrosa, Monteiro; Mônica Ammon, Fernandez; Silvaria Carvalho, Thiengo.

    Full Text Available [...] Abstract in english 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 Col [...] ony Cândido Mendes (Ilha Grande Prison).

  8. 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)

    Sônia Barbosa dos Santos

    1999-01-01

    Full Text Available A malacological survey has been done by the s?nior 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.

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

    OpenAIRE

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

    1993-01-01

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

  10. 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)

    OpenAIRE

    Monteiro, J. C.; Coelho, A. C. S.

    2002-01-01

    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.O presente estudo trata do exame comparativo das partes moles dos turbinídeos Astraea latispina e As...

  11. Registro de Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda no Brasil: caramujo hospedeiro intermediário da angiostrongilíase Occurrence of Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda in Brazil: intermediate snail host of angiostrongyliasis

    Directory of Open Access Journals (Sweden)

    Horácio Manuel Santana Teles

    1997-06-01

    Full Text Available A introdução de Achatina fulica é assinalada em Itariri, SP, Brasil. Essa espécie de caramujo terrestre foi importada para cultivo, visando à comercialização para consumo humano como "escargot". O encontro de exemplares em vida livre mostra a dispersão de A. fulica e, conseqüentemente, o risco de transmissão de Angiostrongylus cantonensis, nematóide parasita do homem e de outros vertebrados. Além disso, o caramujo é uma praga importante da agricultura.Achatina fulica, the intermediate snail host of angiostrongyliasis and also an agricultural pest, is being bred in Brazil for human consumption as "escargot". The snail has escaped from its artificial breeding sites and its dispersal in Itariri county, State of S. Paulo, is reported here for the first time. A. fulica is a transmitter of the rat lungworm Angiostrongylus cantonensis, nematode which causes meningoencephalic angiostrongyliasis; the risks of human contamination are commented on.

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

    Energy Technology Data Exchange (ETDEWEB)

    Okazaki, K. [Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil). Supervisao de Radiobiologia; Andrade Junior, H.F. [Sao Paulo Univ., SP (Brazil). Faculdade de Medicina. Inst. de Medicina Tropical; Kawano, T. [Instituto Butantan, Sao Paulo, SP (Brazil). Laboratorio de Biologia Celular

    1996-12-31

    A study was carried out on the radiosensitivity of Biomphalaria glabrata embryos submitted to doses of 5, 10, 15, 20 and 25 Gy of {sup 60} Co during the cleavage, blastula, gastrula, young trochophore and trochophore stages. Mortality, malformation and hatching were the parameters used to evaluate the damage induced by ionizing radiation. Estimated L D{sub 50} values (15 days) showed that the cleavage stage (4.3 Gy) was approximately four times more radiosensitive than the trochophore stage (17.0 Gy). Susceptibility to malformation induction was higher in the blastula, gastrula and young trochophore stages. Several types of morphogenetic malformations were observed, such as head malformations, exogastrulas, shell malformations, and embryos with everted stomodeum, with nonspecific malformations being the most frequent. The types of malformation induced by radiation probably are not radiation-specific and do not depend on the dose applied. The dose of 15 Gy was sufficient to greatly reduce the number of hatching snails regardless of the embryonic stage irradiated. We conclude that the effect of {sup 60} Co gamma radiation on B. glabrata embryos presented a specific pattern. (author) 41 refs., 5 figs., 4 tabs.

  13. Mitochondrial and nuclear DNA analysis revealed a cryptic species and genetic introgression in Littorina sitkana (Mollusca, Gastropoda).

    Science.gov (United States)

    Azuma, Noriko; Yamazaki, Tomoyasu; Chiba, Susumu

    2011-12-01

    We investigated mitochondrial and nuclear DNA genotypes in nominal Littorina sitkana samples from 2 localities in Eastern Hokkaido, northern Japan. Our results indicated the existence of cryptic species. In the analysis of partial mitochondrial Cytchrome b gene sequences, haplotypes of L. sitkana samples were monophyletic in a phylogenetic tree with orthologous sequences from other Littorina species, but were apparently separated in 2 clades. One included typical L. sitkana (CBa clade) samples, which formed a clade with an allopatric species, L. horikawai. The other, CBb, was independent from CBa and L. horikawai. Haplotypes of the mitochondrial 16S rRNA gene also separated into 2 clades. We additionally examined intron sequence of the heat shock cognate 70 (HSC70) nuclear gene and identified 17 haplotypes. These were also separated into 2 clades, HSCa and HSCb. Among the examined Hokkaido samples, 60% of individuals were heterozygotes. However, each heterozygote consisted of haplotypes from the same clade, HSCa or HSCb, and no admixture of HSCa and HSCb haplotypes was observed. These results indicate reproductive isolation between the 2 clades. Among the genotyped Hokkaido samples, 93% of individuals had CBa + HSCa or CBb + HSCb genotypes, and 7% had CBb + HSCa genotypes. The discrepancy between the mtDNA and nuclear DNA haplotypes in a few individuals may have been caused by genetic introgression due to past hybridization. PMID:22374127

  14. Development and validation of an OECD reproductive toxicity test guideline with the pond snail Lymnaea stagnalis (Mollusca, Gastropoda).

    Science.gov (United States)

    Ducrot, Virginie; Askem, Clare; Azam, Didier; Brettschneider, Denise; Brown, Rebecca; Charles, Sandrine; Coke, Maïra; Collinet, Marc; Delignette-Muller, Marie-Laure; Forfait-Dubuc, Carole; Holbech, Henrik; Hutchinson, Thomas; Jach, Arne; Kinnberg, Karin L; Lacoste, Cédric; Le Page, Gareth; Matthiessen, Peter; Oehlmann, Jörg; Rice, Lynsey; Roberts, Edward; Ruppert, Katharina; Davis, Jessica Elphinstone; Veauvy, Clemence; Weltje, Lennart; Wortham, Ruth; Lagadic, Laurent

    2014-12-01

    The OECD test guideline development program has been extended in 2011 to establish a partial life-cycle protocol for assessing the reproductive toxicity of chemicals to several mollusk species, including the great pond snail Lymnaea stagnalis. In this paper, we summarize the standard draft protocol for a reproduction test with this species, and present inter-comparison results obtained in a 56-day prevalidation ring-test using this protocol. Seven European laboratories performed semi-static tests with cultured snails of the strain Renilys® exposed to nominal concentrations of cadmium chloride (from 53 to 608?gCdL(-1)). Cd concentrations in test solutions were analytically determined to confirm accuracy in the metal exposure concentrations in all laboratories. Physico-chemical and biological validity criteria (namely dissolved oxygen content >60% ASV, water temperature 20±1°C, control snail survival >80% and control snail fecundity >8 egg-masses per snail over the test period) were met in all laboratories which consistently demonstrated the reproductive toxicity of Cd in snails using the proposed draft protocol. Effect concentrations for fecundity after 56days were reproducible between laboratories (68

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

    Science.gov (United States)

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

    2013-01-01

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

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

    Directory of Open Access Journals (Sweden)

    ESMAR SOUZA JÚNIOR

    2013-06-01

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

  17. Analysis of a deep transcriptome from the mantle tissue of Patella vulgata Linnaeus (Mollusca: Gastropoda: Patellidae) reveals candidate biomineralising genes.

    Science.gov (United States)

    Werner, Gijsbert D A; Gemmell, Patrick; Grosser, Stefanie; Hamer, Rebecca; Shimeld, Sebastian M

    2013-04-01

    The gastropod Patella vulgata is abundant on rocky shores in Northern Europe and a significant grazer of intertidal algae. Here we report the application of Illumina sequencing to develop a transcriptome from the adult mantle tissue of P. vulgata. We obtained 47,237,104 paired-end reads of 51 bp, trialled de novo assembly methods and settled on the additive multiple K method followed by redundancy removal as resulting in the most comprehensive assembly. This yielded 29,489 contigs of at least 500 bp in length. We then used three methods to search for candidate genes relevant to biomineralisation: searches via BLAST and Hidden Markov Models for homologues of biomineralising genes from other molluscs, searches for predicted proteins containing tandem repeats and searches for secreted proteins that lacked a transmembrane domain. From the results of these searches we selected 15 contigs for verification by RT-PCR, of which 14 were successfully amplified and cloned. These included homologues of Pif-177/BSMP, Perlustrin, SPARC, AP24, Follistatin-like and Carbonic anhydrase, as well as three containing extensive G-X-Y repeats as found in nacrein. We selected two for further verification by in situ hybridisation, demonstrating expression in the larval shell field. We conclude that de novo assembly of Illumina data offers a cheap and rapid route to a predicted transcriptome that can be used as a resource for further biological study. PMID:22865210

  18. Analysis of a deep transcriptome from the mantle tissue of Patella vulgata Linnaeus (Mollusca: Gastropoda: Patellidae) reveals candidate biomineralising genes.

    OpenAIRE

    Werner, Gd; Gemmell, P.; Grosser, S.; Hamer, R.; Shimeld, Sm

    2013-01-01

    The gastropod Patella vulgata is abundant on rocky shores in Northern Europe and a significant grazer of intertidal algae. Here we report the application of Illumina sequencing to develop a transcriptome from the adult mantle tissue of P. vulgata. We obtained 47,237,104 paired-end reads of 51 bp, trialled de novo assembly methods and settled on the additive multiple K method followed by redundancy removal as resulting in the most comprehensive assembly. This yielded 29,489 contigs of at least...

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

    Directory of Open Access Journals (Sweden)

    Nathalie Yonow

    2012-05-01

    Full Text Available Seventy species of opisthobranchs are described in this work based on collections from the Persian Gulf, Socotra, Kenya, Zanzibar, Madagascar, La Réunion, Mauritius, the Seychelles, the Maldives, and Sri Lanka. Ten species are newly recorded from the western Indian Ocean and four species are recorded in the scientific literature for the first time since their original descriptions. Two species are described as new: Cyerce bourbonica sp. n. from La Réand Doriopsilla nigrocera sp. n. from the Persian Gulf coast of Saudi Arabia. Chromodoris cavae is removed from its synonymy with C. tennentana and redescribed from specimens from La Réunion, while several new synonyms are proposed for some commonly occurring species. Risbecia bullockii is recorded for the second time from the Indian Ocean and assigned to its correct genus.

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

    Directory of Open Access Journals (Sweden)

    Arnaldo Maldonado Júnior

    2010-11-01

    Full Text Available The rat lungworm Angiostrongylus cantonensis is a worldwide-distributed zoonotic nematode that can cause human eosinophilic meningoencephalitis. Here, for the first time, we report the isolation of A. cantonensis from Achatina fulica from two Brazilian states: Rio de Janeiro (specifically the 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.

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

    Science.gov (United States)

    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

    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

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

    Scientific Electronic Library Online (English)

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

    2010-11-01

    Full Text Available SciELO Brazil | Language: English Abstract in english The rat lungworm Angiostrongylus cantonensis is a worldwide-distributed zoonotic nematode that can cause human eosinophilic meningoencephalitis. Here, for the first time, we report the isolation of A. cantonensis from Achatina fulica from two Brazilian states: Rio de Janeiro (specifically the munici [...] palities of Barra do Piraí, situated at the Paraiba River Valley region and São Gonçalo, situated at the edge of Guanabara Bay) and Santa Catarina (in municipality of Joinville). The lungworms were identified by comparing morphological and morphometrical data obtained from adult worms to values obtained from experimental infections of A. cantonensis from Pernambuco, Brazil, and Akita, Japan. Only a few minor morphological differences that were determined to represent intra-specific variation were observed. This report of A. cantonensis in South and Southeast Brazil, together with the recent report of the zoonosis and parasite-infected molluscs in Northeast Brazil, provide evidence of the wide distribution of A. cantonensis in the country. The need for efforts to better understand the role of A. fulica in the transmission of meningoencephalitis in Brazil and the surveillance of molluscs and rodents, particularly in ports, is emphasized.

  3. Imposex induction in Stramonita haemastoma floridana (Conrad, 1837) (Mollusca: Gastropoda: Muricidae) submitted to an organotin-contaminated diet

    Scientific Electronic Library Online (English)

    Aline Fernandes Alves de, Lima; Ítalo Braga de, Castro; Cristina de Almeida, Rocha-Barreira.

    2006-03-01

    Full Text Available SciELO Brazil | Language: English Abstract in portuguese Organismos marinhos são afetados por compostos organoestânicos que causam uma série de efeitos deletérios aos mesmos. O mais conhecido efeito da contaminação por organoestânicos é o imposex. Esse fenômeno consiste na masculinização de fêmeas de moluscos neogastrópodes tais como Stramonita haemastoma [...] floridana. Esses compostos tendem a se acumular em moluscos devido a sua baixa capacidade de eliminá-los. Um total de 248 indivíduos de S. haemastoma floridana foram coletados de uma população livre qualquer indício de imposex. Esses animais foram mantidos em 7 aquários, com aproximadamente 30 indivíduos cada, 1 desses aquários foi considerado como controle e os animas do mesmo alimentados com ostras obtidas de locais onde não se verificou a ocorrência de imposex em neogastrópodes nativos. Os animais nos outros 6 aquários foram alimentados com ostras obtidas em local onde a incidência de imposex entre os gastrópodes nativos revelou-se muito alta. A cada 15 dias, por um período total de 90 dias, os animais de um dos tanques eram retirados e analisados quanto à presença de imposex. Os níveis de imposex foram quantificados através da % de imposex e dos índices: RPLI, RPSI e VDSI. Observou-se a indução de imposex em S. haemastoma floridana através da dieta a partir de Crassostrea rhizophora e um aumento significativo dos índices com o decorrer do tempo de exposição. Os animais do aquário controle foram analisados ao fim do experimento não revelando qualquer indício de imposex. Abstract in english Marine organisms are affected by organotin compounds due to the cumulative, deleterious effects of these latter. The most evident and well known consequence of organotin contamination is imposex, a hormonal disruption that causes a superimposition of sexual male features in females of prosobranchia [...] neogastropod molluscs such as Stramonita haemastoma floridana. Molluscs accumulate organotins mainly because of their poor ability to eliminate TBT and DBT from their tissues. The aim of this study was to analyze organotin uptake by ingestion experimentally, using uncontaminated subjects (S. haemastoma floridana) fed with organotin-contaminated oysters (Crassostrea rhizophorae). A total of 248 gastropods, distributed in 7 tanks with uncontaminated water and contaminated food, were used in this study, a control group being fed uncontaminated oysters. Every 15 days, the individuals of one of the tanks were examined for the presence of imposex. Development of imposex was measured using the VDSI, RPSI and RPLI indexes. The animals had already developed imposex within the first 15 days, all the indexes measured (RPLI, RPSI and VDSI) having increased significantly with duration of exposure, indicating that the animals were probablycontaminated by the food and had accumulated the pollutant. New paths of imposex development were also observed.

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

    Science.gov (United States)

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

    2010-08-01

    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

  5. Do the changes in temperature and light affect the functional response of the benthic mud snail Heleobia australis (Mollusca: Gastropoda)?

    Scientific Electronic Library Online (English)

    THAISA R.F., MAGALHÃES; RAQUEL A.F., NEVES; JEAN L., VALENTIN; GISELA M., FIGUEIREDO.

    1197-12-01

    Full Text Available SciELO Brazil | Language: English Abstract in portuguese O objetivo deste estudo foi determinar a influência do aumento de temperatura associado à incidência luminosa na resposta funcional de Heleobia australis. Experimentos foram conduzidos utilizando nove a dez concentrações de alimento para cada tratamento: 20°C sem luz, 30°C sem luz e 30°C sob baixa i [...] ncidência luminosa. Para cada experimento, a resposta funcional tipo III (sigmoidal) apresentou o melhor ajuste e os parâmetros das equações foram determinados. Os resultados sugerem que com o aumento da temperatura no sedimento, H. australis não terá sua taxa de ingestão afetada negativamente. Por outro lado, seu comportamento alimentar parece ser negativamente afetado pela incidência luminosa. As taxas de ingestão estimadas para o conteúdo orgânico na Baía de Guanabara foram: 0,34 µgC ind–1h–1 a 20°C em ausência de luz, 1.44 µgC ind–1h–1 a 30°C em ausência de luz e 0,64 µgC ind–1h–1 a 30°C sob incidência luminosa. Nesta situação, as maiores taxas de ingestão foram estimadas em condições de alta temperatura, mesmo com incidência luminosa, sugerindo que a temperatura parece ter um efeito que predomina sobre o efeito da luz. Porém, considerando maiores concentrações de carbono, mesmo em temperatura alta, o experimento realizado com incidência luminosa apresentou taxas de ingestão mais baixas que aquelas do experimento conduzido a 20°C em ausência de luz. Este estudo fornece a primeira quantificação das taxas de ingestão de H. australis e os efeitos das modificações na temperatura e incidência luminosa no seu comportamento alimentar. Abstract in english The aim of this study was to determine the influence of temperature increase combined to conditions of light incidence on functional response of Heleobia australis. Experiments were conducted using nine to ten food concentrations for each treatment: 20°C without light; 30°C without light and, 30°C u [...] nder low light intensity. For each experiment, the functional response type III (sigmoidal) was fitted and equation parameters were determined. Results suggest that, if the sediment temperature increases, H. australis will not have its ingestion rates affected negatively, whilst its feeding behavior seems to be negatively affected by light. Ingestion rates estimated for organic content in the Guanabara Bay were: 0.34 µgC ind–1h–1 at 20°C without light, 1.44 µgC ind–1h–1 at 30°C without light and 0.64 µgC ind–1h–1 at 30°C under light incidence. Higher ingestion rates were estimated at the high temperature, even under light incidence, and temperature seems to have outweighed the light effect. In contrast, if higher carbon content is considered, despite high temperature, the experiment conducted with light incidence showed lower ingestion rates than those from the experiment at 20°C without light. This study provides the first quantification of H. australis ingestion rates and the effects that changes in temperature and light have on its feeding behavior.

  6. Annotated type catalogue of the Bothriembryontidae and Odontostomidae (Mollusca, Gastropoda, Orthalicoidea) in the Natural History Museum, London.

    Science.gov (United States)

    Breure, Abraham S H; Ablett, Jonathan D

    2012-01-01

    The type status is described for specimens of 84 taxa classified within the families Bothriembryontidae and Odontostomidae (superfamily Orthalicoidea) and kept in the Natural History Museum, London. Lectotypes are designated for Bulimus (Liparus) brazieri Angas, 1871; Bulimus broderipii Sowerby I, 1832; Bulimus fuligineus Pfeiffer, 1853; Helix guarani d'Orbigny, 1835; Bulimus (Tomigerus) ramagei E.A. Smith, 1890; Helix rhodinostoma d'Orbigny, 1835; Bulimus (Bulimulus) ridleyi E.A. Smith, 1890. The type status of the following taxa is changed to lectotype in accordance with Art. 74.6 ICZN: Placostylus (Euplacostylus) cylindricus Fulton, 1907; Bulimus pyrostomus Pfeiffer, 1860; Bulimus turneri Pfeiffer, 1860. The following taxon is synonymised: Bulimus oblitus Reeve, 1848 = Bahiensis neglectus (Pfeiffer, 1847). PMID:22539914

  7. Annotated type catalogue of the Bothriembryontidae and Odontostomidae (Mollusca, Gastropoda, Orthalicoidea) in the Natural History Museum, London

    OpenAIRE

    Abraham Breure; Jonathan Ablett

    2012-01-01

    The type status is described for specimens of 84 taxa classified within the families Bothriembryontidae and Odontostomidae (superfamily Orthalicoidea) and kept in the Natural History Museum, London. Lectotypes are designated for Bulimus (Liparus) brazieri Angas, 1871; Bulimus broderipii Sowerby I, 1832; Bulimus fuligineus Pfeiffer, 1853; Helix guarani d’Orbigny, 1835; Bulimus (Tomigerus) ramagei E.A. Smith, 1890; Helix rhodinostoma d’Orbigny, 1835; Bulimus (Bulimulus) ridleyi E.A. Smith, ...

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

    Science.gov (United States)

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

    2000-10-01

    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

  9. 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)

    Ramos, M.ª A.

    2007-06-01

    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.

  10. Freshwater snails (Mollusca: Gastropoda) from the Commonwealth of Dominica with a discussion of their roles in the transmission of parasites

    Science.gov (United States)

    We collected six species of freshwater snails from Dominica, including Biomphalaria kuhniana, Gundlachia radiata Helisoma (= Planorbella) trivolvis, Melanoides tuberculata, Neritina punctulata, and Physa marmorata. Our collections indicate that un-reported species such as Gundlachia radiata and Hel...

  11. Developmental toxicity, acute toxicity and mutagenicity testing in freshwater snails Biomphalaria glabrata (Mollusca: Gastropoda) exposed to chromium and water samples.

    Science.gov (United States)

    Tallarico, Lenita de Freitas; Borrely, Sueli Ivone; Hamada, Natália; Grazeffe, Vanessa Siqueira; Ohlweiler, Fernanda Pires; Okazaki, Kayo; Granatelli, Amanda Tosatte; Pereira, Ivana Wuo; Pereira, Carlos Alberto de Bragança; Nakano, Eliana

    2014-12-01

    A protocol combining acute toxicity, developmental toxicity and mutagenicity analysis in freshwater snail Biomphalaria glabrata for application in ecotoxicological studies is described. For acute toxicity testing, LC50 and EC50 values were determined; dominant lethal mutations induction was the endpoint for mutagenicity analysis. Reference toxicant potassium dichromate (K2Cr2O7) was used to characterize B. glabrata sensitivity for toxicity and cyclophosphamide to mutagenicity testing purposes. Compared to other relevant freshwater species, B. glabrata showed high sensitivity: the lowest EC50 value was obtained with embryos at veliger stage (5.76mg/L). To assess the model applicability for environmental studies, influent and effluent water samples from a wastewater treatment plant were evaluated. Gastropod sensitivity was assessed in comparison to the standardized bioassay with Daphnia similis exposed to the same water samples. Sampling sites identified as toxic to daphnids were also detected by snails, showing a qualitatively similar sensitivity suggesting that B. glabrata is a suitable test species for freshwater monitoring. Holding procedures and protocols implemented for toxicity and developmental bioassays showed to be in compliance with international standards for intra-laboratory precision. Thereby, we are proposing this system for application in ecotoxicological studies. PMID:25259848

  12. New insight in lymnaeid snails (Mollusca, Gastropoda) as intermediate hosts of Fasciola hepatica (Trematoda, Digenea) in Belgium and Luxembourg

    OpenAIRE

    Caron, Yannick; Martens, K.; Lempereur, Laetitia; Saegerman, Claude; Losson, Bertrand

    2014-01-01

    Background The present study aims to assess the epidemiological role of different lymnaeid snails as intermediate hosts of the liver fluke Fasciola hepatica in Belgium and Luxembourg. Methods During summer 2008, 7103 lymnaeid snails were collected from 125 ponds distributed in 5 clusters each including 25 ponds. Each cluster was located in a different biogeographic area of Belgium and Luxembourg. In addition, snails were also collected in sixteen other biotopes considered as tempora...

  13. On the presence of Helix lucorum Linnaeus, 1758 (Mollusca, Gastropoda, Helicidae in Le Vesinet, a western suburb of Paris

    Directory of Open Access Journals (Sweden)

    Henk K. Mienis

    2010-01-01

    Full Text Available The Turkish snail Helix lucorum is reported from a garden in Le Vesinet (Paris, France. This introduced species seems to be present in a number of gardens in that suburb. Additional populations may be expected in other areas of France and elsewhere in Europe where living specimens of Helix lucorum are sold on markets and in shops.

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

    International Nuclear Information System (INIS)

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

  15. Relation between aquatic plants and gastropods (Mollusca, Gastropoda) in the region of Gentilly I (Quebec) nuclear generating station

    International Nuclear Information System (INIS)

    This study is based on a sampling of the gastropods present in the vegetation of the St. Lawrence riverside zone at Gentilly. A total of 536 plant specimens belonging to 20 species as well as 37 239 specimens grouping 10 different species of gastropods were sampled. A comparison of the plant species - mollusc data was carried out. The analysis of the results indicates that prosobranchs have no affinity whatsoever for any plant species in particular. The pulmonates, however, are found mainly on emergent plants. (author)

  16. Spatial diversity of rocky midlittoral macro-invertebrates associated with the endangered species Patella ferruginea (Mollusca: Gastropoda) of Tunisian coastline

    Science.gov (United States)

    Tlig-Zouari, Sabiha; Rabaoui, Lotfi; Fguiri, Hosni; Diawara, Moctar; Ben Hassine, Oum Kalthoum

    2010-04-01

    The present study focuses on horizontal spatial variability of benthic macrofauna associated with Patella ferruginea. Thirty-six samples collected at 12 transects belonging to 4 midlittoral sites along the rocky Tunisian coastline, were examined. A total of 44 species belonging to 5 taxa were found. Multivariate analysis applied on gathered data did not show a horizontal spatial variability at small scale (between transects), but at large scale, between sites as well as sectors. Thus, three groups of communities were identified (GI: Korbous and El Haouaria; GIIa: Zembra Island and GIIb: Kelibia). The distribution of species abundance within these groups revealed that crustaceans were the most abundant taxon, due to the overwhelming dominance of Chthamalus stellatus. This substratum appeared to create favourable micro-habitats for the installation of molluscs including gastropods. Regarding the low diversity index ( H') and evenness ( J), they seemed to reflect a disturbance and a demographic unbalance within these communities. The heterogeneity of substrate surface, created by C. stellatus specimens appeared to be caused by various complex interactions established between the key components of these communities in particular suspension feeders, predators, herbivorous molluscs and macroalgae. Thus, the dynamic status of each of these communities is the result of these complex interactions.

  17. Do the changes in temperature and light affect the functional response of the benthic mud snail Heleobia australis (Mollusca: Gastropoda)?

    Science.gov (United States)

    Magalhães, Thaisa R F; Neves, Raquel A F; Valentin, Jean L; Figueiredo, Gisela M

    2014-09-01

    The aim of this study was to determine the influence of temperature increase combined to conditions of light incidence on functional response of Heleobia australis. Experiments were conducted using nine to ten food concentrations for each treatment: 20°C without light; 30°C without light and, 30°C under low light intensity. For each experiment, the functional response type III (sigmoidal) was fitted and equation parameters were determined. Results suggest that, if the sediment temperature increases, H. australis will not have its ingestion rates affected negatively, whilst its feeding behavior seems to be negatively affected by light. Ingestion rates estimated for organic content in the Guanabara Bay were: 0.34 µgC ind-1h-1 at 20°C without light, 1.44 µgC ind-1h-1 at 30°C without light and 0.64 µgC ind-1h-1 at 30°C under light incidence. Higher ingestion rates were estimated at the high temperature, even under light incidence, and temperature seems to have outweighed the light effect. In contrast, if higher carbon content is considered, despite high temperature, the experiment conducted with light incidence showed lower ingestion rates than those from the experiment at 20°C without light. This study provides the first quantification of H. australis ingestion rates and the effects that changes in temperature and light have on its feeding behavior. PMID:25014915

  18. Annotated type catalogue of the Megaspiridae, Orthalicidae, and Simpulopsidae (Mollusca, Gastropoda, Orthalicoidea) in the Natural History Museum, London.

    Science.gov (United States)

    Breure, Abraham S H; Ablett, Jonathan D

    2015-01-01

    The type status is described for 65 taxa of the Orthalicoidea, classified within the families Megaspiridae (14), Orthalicidae (30), and Simpulopsidae (20); one taxon is considered a nomen inquirendum. Lectotypes are designated for the following taxa: Helixbrephoides d'Orbigny, 1835; Simpulopsiscumingi Pfeiffer, 1861; Bulimulus (Protoglyptus) dejectus Fulton, 1907; Bulimusiris Pfeiffer, 1853. The type status of Bulimussalteri Sowerby III, 1890, and Strophocheilus (Eurytus) subirroratus da Costa, 1898 is now changed to lectotype according Art. 74.6 ICZN. The taxa Bulimusloxostomus Pfeiffer, 1853, Bulimusmarmatensis Pfeiffer, 1855, Bulimusmeobambensis Pfeiffer, 1855, and Orthalicuspowissianusvar.niveusPreston 1909 are now figured for the first time. The following taxa are now considered junior subjective synonyms: Bulimusmarmatensis Pfeiffer, 1855 = Helix (Cochlogena) citrinovitrea Moricand, 1836; Vermiculatus Breure, 1978 = Bocourtia Rochebrune, 1882. New combinations are: Kuschelenia (Bocourtia) Rochebrune, 1882; Kuschelenia (Bocourtia) aequatoria (Pfeiffer, 1853); Kuschelenia (Bocourtia) anthisanensis (Pfeiffer, 1853); Kuschelenia (Bocourtia) aquila (Reeve, 1848); Kuschelenia (Bocourtia) badia (Sowerby I, 1835); Kuschelenia (Bocourtia) bicolor (Sowerby I, 1835); Kuschelenia (Bocourtia) caliginosa (Reeve, 1849); Kuschelenia (Bocourtia) coagulata (Reeve, 1849); Kuschelenia (Bocourtia) cotopaxiensis (Pfeiffer, 1853); Kuschelenia (Bocourtia) filaris (Pfeiffer, 1853); Karaindentata (da Costa, 1901); Clathrorthalicusmagnificus (Pfeiffer, 1848); Simpulopsis (Eudioptus) marmartensis (Pfeiffer, 1855); Kuschelenia (Bocourtia) nucina (Reeve, 1850); Kuschelenia (Bocourtia) ochracea (Morelet, 1863); Kuschelenia (Bocourtia) peaki (Breure, 1978); Kuschelenia (Bocourtia) petiti (Pfeiffer, 1846); Clathrorthalicusphoebus (Pfeiffer, 1863); Kuschelenia (Bocourtia) polymorpha (d'Orbigny, 1835); Scholvieniaporphyria (Pfeiffer, 1847); Kuschelenia (Bocourtia) purpurata (Reeve, 1849); Kuschelenia (Bocourtia) quechuarum Crawford, 1939; Quechuasalteri (Sowerby III, 1890); Kuschelenia (Bocourtia) subfasciata Pfeiffer, 1853; Clathrorthalicusvictor (Pfeiffer, 1854). In an addedum a lectotype is being designated for Bulimulus (Drymaeus) interruptusvar.pallidus Preston, 1909. An index is included to all taxa mentioned in this paper and the preceding ones in this series (Breure and Ablett 2011, 2012, 2014). PMID:25632243

  19. Putative midkine family protein up-regulation in Patella caerulea (Mollusca, Gastropoda) exposed to sublethal concentrations of cadmium

    International Nuclear Information System (INIS)

    A cDNA sequence of a putative midkine (MK) family protein was identified and characterised in the mollusc Patella caerulea. The midkine family consists of two members, midkine and pleiotrophin (PTN), and it is one of the recently discovered cytokines. Our results show that this putative midkine protein is up-regulated in specimens of P. caerulea exposed to sublethal cadmium concentrations (i.e. 0.5 and 1 mg l-1 Cd) over a 10-day exposure period. Semiquantitative RT-PCR and quantitative Real time RT-PCR estimations indicate elevated expression of midkine mRNA in exposed specimens compared to controls. Moreover, RT-PCR Real time values were higher in the viscera (here defined as the part of the soft tissue including digestive gland plus gills) than in the foot (i.e. foot plus head plus heart) of the limpets. At present, information on the functional signalling significance of the midkine family proteins suggests that the up-regulation of P. caerulea putative midkine family protein is a distress signal likely with informative value on health status of the organism and with potential prognostic capability

  20. Effect of temperature on growth, mortality, reproduction, and production of adult Lymnaea obrussa Say (Mollusca:Gastropoda)

    International Nuclear Information System (INIS)

    Shell lengths and egg production were measured weekly under constant (K; 10, 15, 20, 250C) and varying temperature regimes during the reproductive period. Varying regimes included natural field temperature in a pond (F; diurnal and seasonal), mean daily field temperature (anti F; seasonal) and 5 and 100C above anti F. Growth rate of large snails (>10 mm) was unaffected by temperature, but small snails (6 to 10 mm) grew fastest at 150C(K). Growth and reproductive periods were longest, production was highest, and mortality rate was lowest at 150C(K). Rate (per snail) of egg production increased with temperature. At equal mean temperature, regime affected growth rate only at anti F. Regime affected the following values as shown: mortality rate,F > anti F = K; rate of reproduction, F > K > anti F; and total production, K > anti F = F. The validity of extrapolation of energetic data from laboratory to field is discussed. Data relating production and temperature are valuable in thermal impact analysis. (U.S.)

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

    Scientific Electronic Library Online (English)

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

    2004-06-01

    Full Text Available 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.

  2. Ecotoxicological studies with newly hatched larvae of Concholepas concholepas (Mollusca, Gastropoda): bioassay with secondary-treated kraft pulp mill effluents.

    Science.gov (United States)

    Manríquez, Patricio H; Llanos-Rivera, Alejandra; Galaz, Sylvana; Camaño, Andrés

    2013-12-01

    The Chilean abalone or "loco" (Concholepas concholepas, Bruguière 1789) represent the most economically important marine recourse exploited from inner inshore Management and Exploitation Areas for Benthic Resources along the Chilean coast. In this study, newly-hatched larvae of C. concholepas were investigated as a potential model species for marine ecotoxicological studies. The study developed a behavioral standard protocol for assessing the impact that kraft pulp mill effluents after secondary treatment have on C. concholepas larvae. Under controlled laboratory conditions, newly-hatched larvae were exposed to a series of different concentrations of kraft pulp mill effluents with secondary treatment (Pinus spp. and Eucalyptus spp.), potassium dichromate as standard reference toxicant and effluent-free control conditions. Regardless of the type of effluent the results indicated that diluted kraft pulp effluent with secondary treatment had reduced effect on larval survival. Low larval survivals were only recorded when they were exposed to high concentrations of the reference toxicant. This suggests that C. concholepas larval bioassay is a simple method for monitoring the effects of kraft pulp mill effluents with secondary treatment discharged into the sea. The results indicated that dilution of ca. 1% of the effluent with an elemental chlorine free (ECF) secondary treatment is appropriate for achieving low larval mortalities, such as those obtained under control conditions with filtered seawater, and to minimize their impact on early ontogenetic stages of marine invertebrates such as newly-hatched larvae of C. concholepas. The methodological aspects of toxicological testing and behavioral responses described here with newly-hatched larvae of C. concholepas can be used to evaluate in the future the potential effects of other stressful conditions as other pollutants or changes in seawater pH associated with ocean acidification. PMID:24099753

  3. Annotated type catalogue of Bothriembryon (Mollusca, Gastropoda, Orthalicoidea in Australian museums, with a compilation of types in other museums

    Directory of Open Access Journals (Sweden)

    Abraham Breure

    2012-05-01

    Full Text Available Type material of 41 Australian Bothriembryon taxa present in Australian museums is critically listed, indicating systematic issues that need to be resolved in further studies. Information on additional type material of 22 taxa in non-Australian museums is compiled. The seven fossil taxa known so far are included in this catalogue. Based on the current systematic position, 38 species are treated in this paper. B. jacksoni Iredale, 1939, B. notatus Iredale, 1939, B. praecelsus Iredale, 1939 and B. serpentinus Iredale, 1939 are elevated to species level. B. gratwicki (Cox, 1899 is listed as status to be determined.

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

    DEFF Research Database (Denmark)

    Lützen, JØrgen; Faasse, Marco

    2012-01-01

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

  5. Annotated type catalogue of the Megaspiridae, Orthalicidae, and Simpulopsidae (Mollusca, Gastropoda, Orthalicoidea) in the Natural History Museum, London

    Science.gov (United States)

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

    2015-01-01

    Abstract The type status is described for 65 taxa of the Orthalicoidea, classified within the families Megaspiridae (14), Orthalicidae (30), and Simpulopsidae (20); one taxon is considered a nomen inquirendum. Lectotypes are designated for the following taxa: Helix brephoides d’Orbigny, 1835; Simpulopsis cumingi Pfeiffer, 1861; Bulimulus (Protoglyptus) dejectus Fulton, 1907; Bulimus iris Pfeiffer, 1853. The type status of Bulimus salteri Sowerby III, 1890, and Strophocheilus (Eurytus) subirroratus da Costa, 1898 is now changed to lectotype according Art. 74.6 ICZN. The taxa Bulimus loxostomus Pfeiffer, 1853, Bulimus marmatensis Pfeiffer, 1855, Bulimus meobambensis Pfeiffer, 1855, and Orthalicus powissianus var. niveus Preston 1909 are now figured for the first time. The following taxa are now considered junior subjective synonyms: Bulimus marmatensis Pfeiffer, 1855 = Helix (Cochlogena) citrinovitrea Moricand, 1836; Vermiculatus Breure, 1978 = Bocourtia Rochebrune, 1882. New combinations are: Kuschelenia (Bocourtia) Rochebrune, 1882; Kuschelenia (Bocourtia) aequatoria (Pfeiffer, 1853); Kuschelenia (Bocourtia) anthisanensis (Pfeiffer, 1853); Kuschelenia (Bocourtia) aquila (Reeve, 1848); Kuschelenia (Bocourtia) badia (Sowerby I, 1835); Kuschelenia (Bocourtia) bicolor (Sowerby I, 1835); Kuschelenia (Bocourtia) caliginosa (Reeve, 1849); Kuschelenia (Bocourtia) coagulata (Reeve, 1849); Kuschelenia (Bocourtia) cotopaxiensis (Pfeiffer, 1853); Kuschelenia (Bocourtia) filaris (Pfeiffer, 1853); Kara indentata (da Costa, 1901); Clathrorthalicus magnificus (Pfeiffer, 1848); Simpulopsis (Eudioptus) marmartensis (Pfeiffer, 1855); Kuschelenia (Bocourtia) nucina (Reeve, 1850); Kuschelenia (Bocourtia) ochracea (Morelet, 1863); Kuschelenia (Bocourtia) peaki (Breure, 1978); Kuschelenia (Bocourtia) petiti (Pfeiffer, 1846); Clathrorthalicus phoebus (Pfeiffer, 1863); Kuschelenia (Bocourtia) polymorpha (d’Orbigny, 1835); Scholvienia porphyria (Pfeiffer, 1847); Kuschelenia (Bocourtia) purpurata (Reeve, 1849); Kuschelenia (Bocourtia) quechuarum Crawford, 1939; Quechua salteri (Sowerby III, 1890); Kuschelenia (Bocourtia) subfasciata Pfeiffer, 1853; Clathrorthalicus victor (Pfeiffer, 1854). In an addedum a lectotype is being designated for Bulimulus (Drymaeus) interruptus var. pallidus Preston, 1909. An index is included to all taxa mentioned in this paper and the preceding ones in this series (Breure and Ablett 2011, 2012, 2014). PMID:25632243

  6. Notes on Opisthobranchia

    Scientific Electronic Library Online (English)

    Ernesto, Marcus.

    1956-12-01

    Full Text Available SciELO Brazil | Language: English Abstract in portuguese Acteon punctostriatus (C. B. Ad.), ainda não indicado do Brasil, parece ser vastamente distribuído, do Cabo Cod até à região de Bahia Blanca, Argentina. As plaquinhas mandibulares e os dentes da rádula assemelham-se às estruturas correspondentes de A. tornatilis (L.). Haminoea elegans (Gray) tem olh [...] os do tipo de Helix e Gastropteron. O órgão copulador masculino é armado, em oposição às espécies européias. Tornatina candei (d'Orb.) possui rádula e, por isso, não pode continuar no mesmo gênero como Retusa canaliculata (Say). O tipo de Acteocina Gray é uma espécie fóssil. Destarte, não é possível decidir se Acteocina deve substituir Tornatina, como Dall quiz, ou se é um sinônimo de Retusa. A locomoção de T. candei combina o movimento por ondulações da sola com "passos". "Tinteiros" quase pretos da Ilha de Marambaia, ca. de 70 km ao oeste do Rio, pertencem a Aplysia (Tullia) juliana Q. G., apesar da secreção preta da glândula de púrpura. Durante a vasante, numerosos exemplares de Aplysia brasiliana Rang foram encontrados pendurados nas pedras, na posição de morcegos em repouso. Os parapódios envolvem o corpo; a ponta posterior da sola prende-se à pedra. Aplysia párvula Morch, ainda não encontrada no Brasil, foi verificada provinda do Recife da Lixa, diante da costa da Baía. Elysia lobata A. Gd., do atol de Eniwetok, possui somente um receptáculo seminal, a espermateca. A espécie é diáulica. O átrio masculino tem um divertículo como Lobiger souverbiei P. Fisch. Os dentes da rádula são irregularmente amontoados no ascus. Nembrotha divae, sp. n., que pertence a um gênero conhecido, principalmente, do Índico e Pacífico Ocidental, caracteriza-se pela cor escarlate e pelo dente mediano da rádula. Polycera marplatensis Franc. é uma das poucas espécies do nosso litoral até agora somente conhecida da costa argentina. Mandíbula e rádula justificam a separação específica (Odhner 1941) de quadrilineata (O. F. Müll.). Polycera odhneri Mare. tem uma parte glandular no duto masculino e, além disso, uma glândula accessória (próstata). Corambe evelinae, sp. n., difere de G. testu-dinaria H. Fisch., a espécie mais próxima, pelo número (até 7) das lamelas branquiais (testudinaria até 4). O espermatocisto comunica-se com o oviduto internamente à entrada do duto uterino neste. Hancockia ryrea Mare. possui o mesmo divertículo esofágico como H. uncinata (Hesse) e H. californica MacF. As descrições de Polycera aurisula Mare. e Antiopella mucloc Marc. foram completadas pelo exame de novo material. Foi dada uma lista de 12 espécies provindas do Cabo Frio (Dra. Diva Diniz Corrêa leg.). Abstract in english [...

  7. Corbicula fluminea (Mollusca, Bivalvia) - the new freshwater clam for Slovakia

    International Nuclear Information System (INIS)

    Specimens of the expansive Asian freshwater clam Corbicula fluminea O. F. Mueller, 1774 (Mollusca: Bivalvia, Corbiculidae) were found on the following three localities of Danube river of Slovakia: Radvan nad Dunajom env. (DFS - 8276a), Komarno env. (DFS - 8274b), Gabcikovo env. (DFS - 8171a). The basic information about this species, key for determination and a photo of an adult individual are presented on the poster. (authors)

  8. A radioactivity study of mollusca distributed along the Syrian coast

    International Nuclear Information System (INIS)

    In the present work, radioactivity has been studied in several Mollusca collected from four selected sites(Al Basset, Lattakia, Banise and Tartous) along the Syrian coast. Concentration Factors (CF) of radionuclides (Lead-210, Polonium-210, Uranium Isotopes, Potassium-40 and Cesium-137) in mussels and shells of Mollusca have been calculated in order to determine the species that could be used as Bioindicators for these isotopes. Statistical analysis of the results using the box plot method showed that the mussels of Spondylus spinosus and Chama pacifica can be used as biomonitor for the studied radionuclides in addition to shell of Strombus persicus and Spondylus spinosus. While the mussels of Brachidonta variabilis and Spondylus spinosus have shown good selectivity for Cd and Pb and Pinctada radiate for Zn and Thais haemostoma for Cu. In addition, the migrant Mullusca from the Red Sea, Strombus persicus, can be used as biomonitor for lead, Zn and Cu, Cd, while the shell of Thais haemostoma for lead. However, the importance of the results of the present study that are considered as a baseline data for radionuclides in Mullusca distributed along the Syria coast and it is the only study in the eastern Mediterranean basin, that defined the Mollusca species which could be use as biomonitors for radionuclides. (Authors)

  9. A radioactivity study of mollusca distributed along the Syrian coast

    International Nuclear Information System (INIS)

    In the present work, radioactivity has been studied in several Mollusca collected from four selected sites (Al Basset, Latakia, Banise and Tartous) along the Syrian coast. Concentration Factors (CF) of radionuclides (Lead-210, Polonium-210, Uranium Isotopes, Potassium-40 and Cesium-137) in mussels and shells of Mollusca have been calculated in order to determine the species that could be used as Bioindicators for these isotopes. Statistical analysis of the results using the box plot method showed that the mussels of Spondylus gaederopus spinosus and Chama pacifica can be used as biomonitor for the studied radionuclides in addition to shell of Strombus decorus persicus and Spondylus gaederopus spinosus. While the mussels of Brachidonta variabilis and Spondylus gaederopus spinosus have shown good selectivity for Cd and Pb and Pinctada radiate for Zn and Thais haemostoma for Cu. In addition, the migrant Mullusca from the Red Sea, Strombus decoruspersicus, can be used as biomonitor for lead, Zn and Cu, Cd, while the shell of Thais haemostoma for lead. However, the importance of the results of the present study that are considered as a baseline data for radionuclides in Mullusca distributed along the Syria coast and it is the only study in the eastern Mediterranean basin, that defined the Mollusca species which could be use as biomonitors for radionuclides. (Authors)

  10. Two new records of Pyramidellidae (Gastropoda, Heterobranchia) from China seas

    Science.gov (United States)

    Chen, Zhiyun; Zhang, Suping

    2011-11-01

    This paper reports two species of the family Pyramidellidae (Gastropoda, Heterobranchia), Otopleura nitida (A. Adams, 1854) and Rugadentia manzakiana (Yokoyama, 1922). The former was from the South China Sea and the latter was from the Yellow Sea and East China Sea. The study was based on the collections deposited in the Marine Biological Museum, Chinese Academy of Sciences. This is for the first time that these species have been recorded in China seas. In the current contribution, we describe and illustrate these two species, and compare them with similar species.

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

    Scientific Electronic Library Online (English)

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

    2005-09-01

    Full Text Available 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

  12. Comunidad de moluscos asociados al mejillón verde Perna viridis (Mollusca: Bivalvia) y sus relaciones tróficas en la costa norte de la Península de Araya, Estado Sucre, Venezuela

    Scientific Electronic Library Online (English)

    Sioliz, Villafranca; Mayré, Jiménez.

    2006-12-01

    Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish Perna viridis es un bivalvo procedente del Indo-Pacífico que habita en la zona intermareal y ha invadido varios ecosistemas de la costa norte del estado Sucre, Venezuela. Con la finalidad de realizar un estudio sobre las comunidades de moluscos asociadas a esta especie y sus relaciones tróficas, se [...] llevaron a cabo muestreos bimensuales entre octubre/97 y agosto/98, en un banco natural de mejillones a dos metros de profundidad en la costa norte de la península de Araya (10°40’N -48°63’W). Los organismos fueron recolectados delimitando el área con una cuadrícula de 0.25 m². Se identificaron los organismos hasta la categoría de especies utilizando claves específicas para moluscos y bibliográficamente se les determinó categoría trófica.Se capturó un total de 1 235 individuos de P. viridis y asociados a la especie 3 163 especímenes pertenecientes al phylum Mollusca, contenidos en tres clases: Bivalvia,Gastropoda y Polyplacophora. Éstas estuvieron representadas por 50 especies correspondientes a 10 órdenes, 24 familias; para los gasterópodos se contabilizaron 25 especies, para los bivalvos 22 y tres para los poliplacóforos. Del total de las especies, 40% fueron filtradoras, 26% carnívoras, 24% herbívoras y el 10% restante presentó dos categorías.De las filtradoras las más representativas fueron: Perna perna, Musculus lateralis, Crassostrea rhizophorae y Ostrea equestris; en el grupo de los carnívoros dominaron tres especies de la familia Columbellidae:Mitrella lunata, Anachis obesa y Nitidella ocellata y para el grupo de los herbívoros destacaron dos especies de la familia Fisurellidae: Diodora cayenensis y D. minuta. Se registraron dos especies filtradoras-detritívoras, y tres especies herbívoras-filtradoras representantes del género C repidula. El alto porcentaje de filtradores sería un indicativo de que dentro de este sistema probablemente hay una mayor disponibilidad de fracciones alimenticias para este grupo. Abstract in english Mollusc communities associated with the green mussel Perna viridis (Mollusca: Bivalvia) and their trophic relations on the north coast of Araya Peninsula, Sucre State, Venezuela. Perna viridis (Linné, 1758) is an Indo-Pacific bivalve of the intertidal zone that has invaded several ecosystems of the [...] north coast of the Sucre State,Venezuela. Bimonthly samplings were carried out between October 1997 and August 1998 to study the mollusc communities associated with this species and their trophic relationships.Studies were conducted on a naturally-occuring bank of mussels two meters deep on the north coast of the peninsula of Araya (10°40’N -48°63’W). Sample organisms were collected withing areas defined by a quadrat of 0.25 m², and were identified to the species level using taxonomic keys that also included bibliographic identification of trophic level. A total of 1 235 individuals of P. viridis were collected, along with 3 163 specimens of associated species belonging to the phylum Mollusca, including bivalves, gastropods and polyplacophora.The associated mollusc organisms represented 50 species corresponding to 10 orders and 24 families, including 25 gastropod species, 22 bivalves and three polyplacophorans. With regard to trophic level 40% of the 50 species were suspensivores, 26% carnivores, 24% herbivores and the residual 10% represented two categories (suspensivore-detritivore, herbivore-suspensivore). Of the suspensivores the most common were: Perna perna, Musculus lateralis, Crassostrea rhizophorae and Ostrea equestris. The carnivore group was dominated by the three species of the Family Columbellidae, Mitrella lunata, Anachis obesa and Nitidella ocellata.The group of herbivores was dominated by two members of the family Fisurellidae, Diodora cayenensis and D. minuta.Two species of suspensivore-detritívore and three species of herbivore-suspensivore were also found in the genus Crepidula. The high percentage of suspensivores was thought indicative, inside this ec

  13. Comunidad de moluscos asociados al mejillón verde Perna viridis (Mollusca: Bivalvia y sus relaciones tróficas en la costa norte de la Península de Araya, Estado Sucre, Venezuela

    Directory of Open Access Journals (Sweden)

    Sioliz Villafranca

    2006-12-01

    Full Text Available Perna viridis es un bivalvo procedente del Indo-Pacífico que habita en la zona intermareal y ha invadido varios ecosistemas de la costa norte del estado Sucre, Venezuela. Con la finalidad de realizar un estudio sobre las comunidades de moluscos asociadas a esta especie y sus relaciones tróficas, se llevaron a cabo muestreos bimensuales entre octubre/97 y agosto/98, en un banco natural de mejillones a dos metros de profundidad en la costa norte de la península de Araya (10°40’N -48°63’W. Los organismos fueron recolectados delimitando el área con una cuadrícula de 0.25 m?. Se identificaron los organismos hasta la categoría de especies utilizando claves específicas para moluscos y bibliográficamente se les determinó categoría trófica.Se capturó un total de 1 235 individuos de P. viridis y asociados a la especie 3 163 especímenes pertenecientes al phylum Mollusca, contenidos en tres clases: Bivalvia,Gastropoda y Polyplacophora. Éstas estuvieron representadas por 50 especies correspondientes a 10 órdenes, 24 familias; para los gasterópodos se contabilizaron 25 especies, para los bivalvos 22 y tres para los poliplacóforos. Del total de las especies, 40% fueron filtradoras, 26% carnívoras, 24% herbívoras y el 10% restante presentó dos categorías.De las filtradoras las más representativas fueron: Perna perna, Musculus lateralis, Crassostrea rhizophorae y Ostrea equestris; en el grupo de los carnívoros dominaron tres especies de la familia Columbellidae:Mitrella lunata, Anachis obesa y Nitidella ocellata y para el grupo de los herbívoros destacaron dos especies de la familia Fisurellidae: Diodora cayenensis y D. minuta. Se registraron dos especies filtradoras-detritívoras, y tres especies herbívoras-filtradoras representantes del género C repidula. El alto porcentaje de filtradores sería un indicativo de que dentro de este sistema probablemente hay una mayor disponibilidad de fracciones alimenticias para este grupo.Mollusc communities associated with the green mussel Perna viridis (Mollusca: Bivalvia and their trophic relations on the north coast of Araya Peninsula, Sucre State, Venezuela. Perna viridis (Linné, 1758 is an Indo-Pacific bivalve of the intertidal zone that has invaded several ecosystems of the north coast of the Sucre State,Venezuela. Bimonthly samplings were carried out between October 1997 and August 1998 to study the mollusc communities associated with this species and their trophic relationships.Studies were conducted on a naturally-occuring bank of mussels two meters deep on the north coast of the peninsula of Araya (10°40’N -48°63’W. Sample organisms were collected withing areas defined by a quadrat of 0.25 m², and were identified to the species level using taxonomic keys that also included bibliographic identification of trophic level. A total of 1 235 individuals of P. viridis were collected, along with 3 163 specimens of associated species belonging to the phylum Mollusca, including bivalves, gastropods and polyplacophora.The associated mollusc organisms represented 50 species corresponding to 10 orders and 24 families, including 25 gastropod species, 22 bivalves and three polyplacophorans. With regard to trophic level 40% of the 50 species were suspensivores, 26% carnivores, 24% herbivores and the residual 10% represented two categories (suspensivore-detritivore, herbivore-suspensivore. Of the suspensivores the most common were: Perna perna, Musculus lateralis, Crassostrea rhizophorae and Ostrea equestris. The carnivore group was dominated by the three species of the Family Columbellidae, Mitrella lunata, Anachis obesa and Nitidella ocellata.The group of herbivores was dominated by two members of the family Fisurellidae, Diodora cayenensis and D. minuta.Two species of suspensivore-detritívore and three species of herbivore-suspensivore were also found in the genus Crepidula. The high percentage of suspensivores was thought indicative, inside this ecosystem, that there is probably a higher degree of nutritious fractions available to this group.

  14. LA CLASE CAUDOFOVEATA (MOLLUSCA) EN EL MAR CARIBE COLOMBIANO* / THE CLASS CAUDOFOVEATA (MOLLUSCA) IN THE COLOMBIAN CARIBBEAN SEA

    Scientific Electronic Library Online (English)

    Adriana, Gracia C.; Erlenis, Fontalvo; Luis Carlos, Gámez.

    2013-12-01

    Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish [...] Abstract in english Five classes of marine mollusks, including Gastropoda, Bivalvia, Cephalopoda, Scaphopoda, and Polyplacophora, have been recorded inhabiting the Colombian Caribbean Sea. Other classes with a basal position within the phylum such as Caudofoveata and Solenogastres have remained overlooked, as a result [...] of their body shape (worm-like with no shell), small sizes (Caudofoveata 1.5 to 140 mm length), and limited taxonomic information for identifications. The presence of Caudofoveata species on the continental margin of the Colombian Caribbean Sea was evidenced through several studies conducted by Invemar between 2007 and 2012. Samples were collected from localities between Gulf of Morrosquillo and La Guajira, in a bathymetrical range from 3 to 1010 m depth. These novel outcomes suggest that Caudofoveata specimens are more common in the marine fauna inhabiting soft bottoms than previously thought.

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

    Directory of Open Access Journals (Sweden)

    DILIAN GEORGIEV

    2011-08-01

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

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

    Directory of Open Access Journals (Sweden)

    Kenné de Kock

    2009-09-01

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

     

     

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

  17. 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)

    Guilherme R. Gorni

    2006-12-01

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

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

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    Ludwig C. A. Naegel

    2004-03-01

    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

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

    Scientific Electronic Library Online (English)

    Ludwig C., A. Naegel.

    2004-03-01

    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

  20. Megalobulimus lopesi sp. n., uma nova espécie de Pulmonata terrestre da Mata Atlântica brasileira (Mollusca, Gastropoda, Megalobulimidae) Megalobulimus lopesi sp. n, a new species of land Pulmonata from the Brazilian Atlantic wood (Gastropoda, Megalobulimidae)

    OpenAIRE

    José Luiz Moreira Leme

    1989-01-01

    Megalobulimus lopesi, a new species of megalobulimidae, is described with basis on conchyological and anatomical characters. It is very close to M. grandis (Martens, 1885), the largest species of land gastropds of Brazil, from Sao Sebastiao Island (23º49'S 45º20'W).

  1. 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

    Directory of Open Access Journals (Sweden)

    CS. de Oliveira

    2008-05-01

    Full Text Available 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.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 menores 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.

  2. 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)

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

    2008-05-01

    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.

  3. Comparative genomics of vesicomyid clam (Bivalvia: Mollusca chemosynthetic symbionts

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    Girguis Peter R

    2008-12-01

    Full Text Available Abstract Background The Vesicomyidae (Bivalvia: Mollusca are a family of clams that form symbioses with chemosynthetic gamma-proteobacteria. They exist in environments such as hydrothermal vents and cold seeps and have a reduced gut and feeding groove, indicating a large dependence on their endosymbionts for nutrition. Recently, two vesicomyid symbiont genomes were sequenced, illuminating the possible nutritional contributions of the symbiont to the host and making genome-wide evolutionary analyses possible. Results To examine the genomic evolution of the vesicomyid symbionts, a comparative genomics framework, including the existing genomic data combined with heterologous microarray hybridization results, was used to analyze conserved gene content in four vesicomyid symbiont genomes. These four symbionts were chosen to include a broad phylogenetic sampling of the vesicomyid symbionts and represent distinct chemosynthetic environments: cold seeps and hydrothermal vents. Conclusion The results of this comparative genomics analysis emphasize the importance of the symbionts' chemoautotrophic metabolism within their hosts. The fact that these symbionts appear to be metabolically capable autotrophs underscores the extent to which the host depends on them for nutrition and reveals the key to invertebrate colonization of these challenging environments.

  4. Quitones (Mollusca: Polyplacophora de El Salvador, América Central

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    Cedar I García-Ríos

    2007-03-01

    Full Text Available En El Salvador se habían registrado los poliplacóforos Chaetopleura lurida (Sowerby, 1832; Ischnochiton guatemalensis (Thiele, 1910; Ceratozona angusta (Thiele, 1909; Chiton stokesii (Broderip, 1832 y Acantochitona exquisita (Pilsbry, 1893. Recolectamos quitones en aguas someras de El Salvador en julio del 2002, agragando a la lista a Lepidochitona beanii (Carpenter, 1857; Ischnochiton dispar (Sowerby, 1832; Stenoplax limaciformis (Sowerby, 1832; Callistochiton expressus (Carpenter, 1865; Acanthochitona arragonites (Carpenter, 1867; Acanthochitona ferreirai (Lyons, 1988 y Acanthochitona hirudiniformis (Sowerby, 1832. Ampliamos la distribución documentada de I. dispar hacia el norte y describimos brevemente una especie innominada de Lepidochitona.Chitons (Mollusca: Polyplacophora from El Salvador, Central America. Collections of 11 species of shallow water Polyplacophora from El Salvador were made in July 2002. Previously only five species had been documented in El Salvador: Chaetopleura lurida (Sowerby, 1832; Ischnochiton guatemalensis (Thiele, 1910; Ceratozona angusta (Thiele, 1909; Chiton stokesii (Broderip, 1832 and Acantochitona exquisita (Pilsbry, 1893. Of these, I. guatemalensis and A. exquisita were not collected in this census. Seven other species are reported here for El Salvador for the first time: Lepidochitona beanii (Carpenter, 1857; Ischnochiton dispar (Sowerby, 1832; Stenoplax limaciformis (Sowerby, 1832; Callistochiton expressus (Carpenter, 1865; Acanthochitona arragonites (Carpenter, 1867; A. ferreirai (Lyons, 1988 and A. hirudiniformis (Sowerby, 1832. The known geographic distribution of I. dispar is extended to the north. An un-named species of Lepidochitona is briefly described. Rev. Biol. Trop. 55 (1: 171-176. Epub 2007 March. 31.

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

    OpenAIRE

    ESMAR SOUZA JÚNIOR; Barros, Jose? Carlos N.; KARLA PARESQUE; Freitas, Rodrigo R.

    2013-01-01

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

  6. Nueva especie de Planorbidae (Gastropoda: Basommatophora en la Patagonia chilena: Biomphalaria cristiani sp. nov. First record of Planorbidae (Mollusca: Basommatophora in Chilean Patagonia: Biomphalaria cristiani sp. nov.

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    Carmen Fuentealba

    2012-11-01

    Full Text Available En Chile la familia Planorbidae está representada por el género Biomphalaria Preston, 1910, compuesta por siete especies distribuidas desde Isluga hasta el río Puelo. De estas especies, solo B.peregrina, ampliamente distribuida en el neotrópico, y Biomphalaria aymara de Isluga, han sido reconocidas sobre la base de la morfología del sistema reproductor y la rádula, caracteres que fueron utilizados en el presente estudio para diferenciar a Biomphalaria cristiani como nueva especie del grupo y primer registro de la familia en la Patagonia chilena, ampliando su actual rango de distribución. Los caracteres que permiten la diagnosis de B. cristiani son el saco vaginal vestigial truncado, ausencia del desarrollo de los músculos suspensores del pene, vaina del pene corta en relación al prepucio, oviducto largo en relación al espermioducto y vaso deferente más delgado y largo que la vaina del pene, de tamano similar al prepucio. La localidad tipo de Biomphalaria cristiani sp. nov. es Laguna Cisnes (47°7'10.02"S, 72°27'40.65"W, región de Aysén.The family Planorbidae in Chile is represented by the genus Biomphalaria Preston, 1910, consisting of seven species distributed from Isluga to Puelo River. Of these species, only Biomphalaria peregrina widely distributed in the neotropical and Biomphalaria aymara from Isluga are recognized based on the morphology of the reproductive system and radula, characters that were used in the following study to differentiate Biomphalaria cristiani as a new species of this group and first record of the family in Chilean Patagonia, extending its current distribution range. The characters for the diagnosis of B. cristiani are: truncated vestigial vaginal pouch, lack of development of the penis retractor muscles, penis sheath shorter than the prepuce, oviduct longer than the spermiduct and vas deferens thinner and longer than the penis sheath, similar size to the prepuce. The type locality of B. cristiani nov. sp. is Laguna Cisnes (47°7'10.02"S; 72°27'40.65"W, Aysén region.

  7. Effect of pollution on some freshwater species. I. histochemical and biochemical features of lead pollution on some organs of Viviparus viviparus L. (Mollusca Gastropoda)

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    Benedetti, I.; Benedetti, L.; Bolognani, L.; Bolognani Fantin, A.M.; Marini, M.; Ottaviani, E.

    1982-01-01

    Experimental lead pollution was studied in some organs (foot, mantle and digestive gland) of Viviparus viviparus L. The amount of lead contained after 48h, 96 h and one week of pollution were established using an atomic absorption spectrophotometer. On the basis of physicochemical determination, it turns out that lead is mainly concentrated in the mantle. The biochemical tests (cholesterol, sulpholipids and phospholipids) were aimed at evaluating the lipids involved in the membranes. The histochemical research was carried out chiefly to evaluate the modifications of polysaccharides and proteins. Some hydrolytic enzymes (Na+ and K+ dependent ATPase) and some ooreductive enzymes (NADH+ and NADPH+ dependent diaphorases, D-lactate dehydrogenase, succinate dehydrogenase and glucose-6-P-dehydrogenase) were also tested. The digestive gland is the most severely damaged organ as proved by histomorphological and biochemical analyses.

  8. On the identities of the molluscan names described in A Short Zoology of Tahiti in the Society Islands by Anthony Curtiss in 1938 (Mollusca: Cephalopoda, Gastropoda).

    Science.gov (United States)

    Low, Martyn E Y; Tan, Siong Kiat

    2014-01-01

    Anthony Curtiss described two species of cephalopod and nine species of gastropod molluscs from Tahiti. Herein, we discuss and determine the identities of these eleven names. Ten of these names are considered to be junior subjective synonyms of well-known taxa, and one an unavailable name. PMID:24870642

  9. Effects of infection by larvae of Angiostrongylus cantonensis (Nematoda, Metastrongylidae) on the lipid metabolism of the experimental intermediate host Biomphalaria glabrata (Mollusca: Gastropoda).

    Science.gov (United States)

    Tunholi-Alves, Vinícius Menezes; Tunholi, Victor Menezes; Gôlo, Patrícia; Lima, Mariana; Garcia, Juberlan; Júnior, Arnaldo Maldonado; Pontes, Emerson Guedes; Bittencourt, Vânia Rita Elias Pinheiro; Pinheiro, Jairo

    2013-05-01

    Experimental infection of Biomphalaria glabrata by Angiostrongylus cantonensis induces significant changes in the concentrations of triacylglycerol and cholesterol in the hemolymph and of neutral lipids in the digestive gonad-gland (DGG) complex of the host snail. In this study, snails were dissected after 1, 2, and 3 weeks of infection to collect the hemolymph and DGG and to measure the levels of cholesterol and triacylglycerol in the hemolymph and neutral lipid fractions in the tissues. The results show that infection by this nematode resulted in a significant decrease in the concentrations of both cholesterol and triacylglycerol in the hemolymph of B. glabrata during the parasite's initial ontogenic development period. This reduction indicates the possible use of these molecules by both parasite and host not only as energy substrates but also as structural factors required during development of the parasite's larval stages. In parallel, changes in the neutral lipid profile in the DGG and lipase activity of the infected snails were observed, indicating the importance of these molecules for successful infection. PMID:23377121

  10. Threatened freshwater and terrestrial molluscs (Mollusca, Gastropoda et Bivalvia of Santa Catarina State, Southern Brazil: check list and evaluation of regional threats

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    2011-06-01

    Full Text Available A total of nineteen continental native mollusc species are confirmed for the Santa Catarina State (SC(organized in ten Genera and seven Families, one aquatic Prosobranchia/Caenogastropoda (Ampullariidae,six Pulmonata terrestrial gastropods (one Ellobiidae, three Megalobulimidae and two micro-snails –Charopidae and Streptaxidae and twelve freshwater mussels (eight Mycetopodidae and four Hyriidae. Thesespecies are designated by the International Union for Conservation of the Nature – IUCN as follows: seven as"Vulnerable", six "In Danger" and six “Without Category Established”. The general regional threats that thesespecies are subjected to are briefly analyzed.

  11. 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

    OpenAIRE

    Jesus Ortea; Manuel Caballer Gutierrez; Samuel Narciso

    2011-01-01

    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 ...

  12. 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.

    Science.gov (United States)

    Caballer, Manuel; Ortea, Jesus; Narciso, Samuel

    2011-01-01

    Two new species of the genus Rissoella Gray, 1847 are described from Venezuela, one from the National Park Morrocoy, Rissoella morrocoyensissp. n. and the other from the Wildlife Refuge Isla de Aves, Rissoella venezolanicolasp. n.Rissoella morrocoyensissp. 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 venezolanicolasp. n. has an angled preumbilical cord which extends to the columella delimiting a trapezoid, a hypobranchial gland marked by a yellow quaver-shaped ribbon and protoconch with fuchsia highlights. It lives on the brown alga Dictyota spp. The records of Rissoella in the Caribbean are revised and illustrations, a comparative table and a key to the Caribbean species known for the genus are provided. PMID:21976997

  13. 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

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    Jesus Ortea

    2011-07-01

    Full Text Available 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 sp. n. has an angled preumbilical cord which extends to the columella delimiting a trapezoid, a hypobranchial gland marked by a yellow quaver-shaped ribbon and protoconch with fuchsia highlights. It lives on the brown alga Dictyota spp. The records of Rissoella in the Caribbean are revised and illustrations, a comparative table and a key to the Caribbean species known for the genus are provided.

  14. New species of Rissoidae (Mollusca, Gastropoda) from the Archipelago of the Azores (northeast Atlantic) with an updated regional checklist for the family.

    Science.gov (United States)

    Cordeiro, Ricardo; Ávila, Sérgio P

    2015-01-01

    Four new species of shallow-water marine gastropods belonging to the family Rissoidae are described from the Archipelago of the Azores: Setiaalexandrae sp. n., Setiaermelindoi sp. n., Setianetoae sp. n., and Manzoniamartinsi sp. n. These novelties increase the regional rissoid fauna to 39 species, of which 29 live in shallow-water habitats. A list of the species of Rissoidae from the Azores is presented based on data from the literature and new material examined. PMID:25685020

  15. Calyptraeotheres sp. nov. (Crustacea: Decapoda: Pinnotheridae), symbiont of the slipper shell Crepidula striolata Menke, 1851 (Mollusca: Gastropoda: Calyptraeidae) from the Gulf of California, Mexico.

    Science.gov (United States)

    Ayón-Parente, Manuel; Hendrickx, Michel E

    2014-01-01

    Calyptraeotheres camposi sp. nov. is described from the Gulf of California, Mexico. The new species is close to C. granti (Glassell, 1933) and C. pepeluisi Campos & Hernández-Ávila, 2010 from the Mexican Pacific and to C. hernandezi Hernández-Ávila & Campos 2006 from the Western Atlantic. These four species feature a third maxilliped with a 2-segmented endopod palp and the exopod with unsegmented flagellum. Calyptraeotheres camposi sp. nov. differs from C. granti and C. hernandezi by having the eyes visible in dorsal view, the carapace with arcuate anterolateral margins, the dorsal, longitudinal depressions connected with the transversal depression, and the propodus of pereiopod 2 equal or slightly longer than the carpus. From C. pepeluisi it is distinguished by the absence of a transversal depression on the carapace and the longitudinal depressions not connecting, the carpus and propodus of the third maxilliped being sub-trapezoidal and sub-conical, respectively, in lieu of subrectangular, and the inner surface of the fixed finger nude instead of bearing short setae near the cutting edge and ventral margin. PMID:25544074

  16. [Effect of iron chloride (III) on hematological status of the Planorbarius corneus (Mollusca: Gastropoda: Bulinidae) in normal snails and during infection with trematode parthenites].

    Science.gov (United States)

    Stadnichenko, A P; Ivanenko, L D; Kirichuk, G E; Ianovich, L N

    2001-01-01

    The effect of three ferric chloride concentrations (100, 200, 300 mg/l) on the acid-alkaline balance of haemolymph and haemoglobin content in Planorbarius corneus under normal conditions and in the case of infection with parthenites and larvae of Echinoparichium aconiatum was examined. In the medium with an effective concentration of ferric chloride, all snail specimens proved to have acidified haemolymph, by 40-50% in infected samples and 80-85% in uninfected ones. Statistically reliable differences in the haemoglobin content in the haemolymph of infected and uninfected specimens between the control and test media were absent, that proves a weak toxic effect of ferric ions on P. corneus. PMID:11548576

  17. The distribution of cells containing FMRFamide- and 5-HT-related molecules in the embryonic development of Viviparus ater (Mollusca, Gastropoda

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    A Franchini

    2009-06-01

    Full Text Available The timing and spatial distribution of cells containing FMRFamide- and 5-HT-related molecules in the embryonic development of the mollusc Viviparus ater are examined using immunohistochemistry. FMRFamide-like molecules emerge in the early stage E8 (8% of embryonic development before the 5-HT immunoreactivity, and they are not only found during nervous system ontogeny. As the parts of the digestive tract differentiated, the pattern of the diffuse gut endocrine cells, present in adults, start to be established (E20-E30, and both open and closed cell types are immunoreactive to anti-FMRFamide antibody. From their appearance (E20, cells with a 5-HT-like phenotype are distributed in the central nervous ganglia and progressively assembled during embryonic development. The early occurrence of both these molecules in V. ater embryos reinforces the growing view that neurotransmitters play a regulatory role in embryogenic processes. In particular, the very early presence of FMRFamide-related factors suggests an involvement of these molecules in the regulation of basic, not only neuronal, cell behaviours, while 5-HT seems to be a more specific neural development signal.

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

    Scientific Electronic Library Online (English)

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

    2013-03-01

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

  19. CHILEAN MARINE MOLLUSCA OF NORTHERN PATAGONIA COLLECTED DURING THE CIMAR-10 FJORDS CRUISE / MOLUSCOS MARINOS CHILENOS DEL NORTE DE LA PATAGONIA RECOLECTADOS DURANTE EL CRUCERO DE FIORDOS CIMAR-10

    Scientific Electronic Library Online (English)

    Javiera, Cárdenas; Cristian, Aldea; Claudio, Valdovinos.

    Full Text Available SciELO Chile | Language: English Abstract in spanish El extremo sur de Sudamérica representa una de las áreas subantárticas más interesantes desde un punto de vista ecológico y biogeográñco. A pesar de ello, el conocimiento que se tiene sobre la biodiversidad del área, y en particular de los habitats marinos submareales, es relativamente pobre. En el [...] año 2004 se realizó un proyecto de investigación sobre biodiversidad como parte del crucero Fiordos Cimar-10, organizado y financiado por el Comité Oceanógrafico Nacional de Chile (CONA). En este artículo se describen los resultados obtenidos sobre de los moluscos submareales. Las muestras fueron obtenidas en el invierno del 2004, a bordo del buque Agor 60 "Vidal Gormaz". El área de estudio se localizó en el extremo norte de la Patagonia chilena, desde el Seno de Relocanví (41 °31' S) hasta la Boca del Guafo (43°49'S), en la plataforma continental comprendida entre 22 y 353 m de profundidad. Los moluscos fueron recolectados en 23 estaciones de muestreo empleando una rastra Agassiz. Se registró un total de 67 especies, consistentes en 4% Polyplacophora (Leptochitonidae, Ischnochitonidae), 58% Gastropoda (Lepetidae, Fissurellidae, Trochidae, Turbinidae, Calyptraeidae, Capulidae, Naticidae, Ranellidae, Cerithiopsidae, Epitoniidae, Muricidae, Buccinidae, Columbellidae, Nassariidae, Volutidae, Cancellariidae, Turridae, Pyramidellidae, Acteonidae, Chilinidae), 36% Bivalvia (Nuculidae, Yoldiidae, Malletiidae, Tindariidae, Limopsidae, Phylobryidae, Mytilidae, Pectinidae, Propeamussidae, Lucinidae, Thyasiridae, Neoleptonidae, Carditidae, Condylocardiidae, Veneridae, Tellinidae, Lyonsiidae, Pandoridae, Cuspidariidae) y 1% Scaphopoda (Rhabdidae). Nuestros resultados muestran que las especies submareales presentan una elevada proporción con carácter austral (magallámco). Del total de 67 taxa registrados, 45 especies son estrictamente magallámcas o antarticas (67%) y 16 presentan una amplia área de distribución que se extiende al sur del área de estudio (24%). Sólo seis de las especies (9%) son estrictamente de la provincia biogeográfica peruana. Abstract in english The tip of the South American cone is one of the most interesting Subantarctic areas, both biogeographically and ecologically. Nonetheless, knowledge of the area's biodiversity, in particular that of the subtidal marine habitats, remains poor. Therefore, in 2004, a biodiversity research project was [...] carried out as a part of the cruise Cimar-10 Fjords, organized and supported by the Chilean National Oceanographic Committee (CONA). The results of the subtidal marine mollusk surveys are presented herein. The samples were collected aboard the Agor 60 "Vidal Gormaz" in winter 2004. The study area covered the northern Chilean Patagonia from Seno de Relocanví (41°31'S) to Boca del Guafo (43°49'S), on the continental shelf from 22 to 353 m depth. The Mollusca were collected at 23 sampling sites using an Agassiz trawl. In total, 67 species were recorded: 4% Polyplacophora (Leptochitonidae, Ischnochitonidae), 58% Gastropoda (Lepetidae, Fissurellidae, Trochidae, Turbinidae, Calyptraeidae, Capulidae, Naticidae, Ranellidae, Cerithiopsidae, Epitoniidae, Muricidae, Buccinidae, Columbellidae, Nassariidae, Volutidae, Cancellariidae, Turridae, Pyramidellidae, Acteonidae, Chilinidae), 36% Bivalvia (Nuculidae, Yoldiidae, Malletiidae, Tindariidae, Limopsidae, Phylobryidae, Mytilidae, Pectinidae, Propeamussidae, Lucinidae, Thyasiridae, Neoleptonidae, Carditidae, Condylocardiidae, Veneridae, Tellinidae, Lyonsiidae, Pandoridae, Cuspidariidae), and 1% Scaphopoda (Rhabdidae). Our results show a high proportion of southern (Magellanic) subtidal species; 45 species (67%) are strictly Magellanic or Antarctic and another 16 (24%) were widespread species, with distributions extending to the south of our study area. Only six species (9%) were strictly Peruvian.

  20. Bathymetric distribution patterns of Southern Ocean macrofaunal taxa: Bivalvia, Gastropoda, Isopoda and Polychaeta

    Science.gov (United States)

    Brandt, Angelika; Linse, Katrin; Schüller, Myriam

    2009-11-01

    The aim of this study is to compare the depth distributions of four major Southern Ocean macrobenthic epi- and infaunal taxa, the Bivalvia, Gastropoda, Isopoda, and Polychaeta, from subtidal to abyssal depth. All literature data up to summer 2008, as well as the unpublished data from the most recent ANDEEP I-III (Antarctic benthic deep-sea biodiversity: colonisation history and recent community patterns) expeditions to the Southern Ocean deep sea are included in the analysis. Benthic invertebrates in the Southern Ocean are known for their wide bathymetric ranges. We analysed the distributions of four of the most abundant and species-rich taxa from intertidal to abyssal (5200 m) depths in depth zones of 100 m. The depth distributions of three macrofaunal classes (Bivalvia, Gastropoda, Polychaeta) and one order (Isopoda) showed distinct differences. In the case of bivalves, gastropods and polychaetes, the number of species per depth zone decreased from the shelf to the slope at around 1000 m depth and then showed stable low numbers. The isopods showed the opposite trend; they were less species rich in the upper 1000 m but increased in species numbers from the slope to bathyal and abyssal depths. Depth ranges of families of the studied taxa (Bivalvia: 31 families, Gastropoda: 60, Isopoda: 32, and Polychaeta: 46 families) were compiled and illustrated. At present vast areas of the deep sea in the Southern Ocean remain unexplored and species accumulation curves showed that only a fraction of the species have been discovered to date. We anticipate that further investigations will greatly increase the number of species known in the Southern Ocean deep sea.

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

    Directory of Open Access Journals (Sweden)

    Luboš Beran

    2010-03-01

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

  2. Occurrence of Aelurostrongylus abstrusus (Railliet, 1898) larvae (Nematoda: Metastrongylidae) infecting Achatina (Lissachatina) fulica Bowdich, 1822 (Mollusca: Gastropoda) in the Amazon region / Ocorrência de Aelurostrongylus abstrusus (Railliet, 1898) (Nematoda: Metastrongylidae) infectando o Achatina (Lissachatina) fulica Bowdich, 1822 (Mollusca: Gastropoda) na região amazônica

    Scientific Electronic Library Online (English)

    Sanny Maria de, Andrade-Porto; Kelly Cristina Pereira de, Souza; Melissa Querido, Cárdenas; Rosemary A., Roque; Daniel Mansur, Pimpão; Cleusa Suzana, Araújo; José Celso de Oliveira, Malta.

    2012-06-01

    Full Text Available SciELO Brazil | Language: English Abstract in portuguese Achatina fulica ou "caramujo africano" é uma espécie exótica, considerada uma das cem piores espécies invasoras do mundo, causando sérios danos ambientais. No presente estudo foi registrado, pela primeira vez, a ocorrência do Aelurostrongylus abstrusus infectando o A.fulica na região amazônica. Esse [...] nematóide é descrito parasitando principalmente o sistema pulmonar de felinos, causando a "aelurostrongilose", também conhecida como estrongiloidose cardio-pulmonar felina. Novos dados morfométricos de larvas de terceiro estágio são apresentados. Dos 45 caramujos coletados, 40% estavam infectados por larvas de A. abstrusus. Especimens de Achatina fulica foram coletados em três áreas da cidade de Manaus: rural, leste e oeste. A zona leste apresentou a maior prevalência de 80%. O grande número de A.fulica encontrado em áreas habitadas aumenta as chances de ocorrência de zoonoses emergentes e destaca a necessidade de mais estudos para o melhor controle da doença. Abstract in english Achatina fulica or "giant African snail" is an exotic species, considered to be one of the world's hundred most invasive species, causing serious environmental damages. In the present study we report, for the first time, the occurrence of Aelurostrongylus abstrusus infecting A.fulica in the Amazon r [...] egion. This nematode is described parasitizing mainly the pulmonary system of felines, which causes "aelurostrongilose", also known as feline cardio-pulmonary strongyloidosis. New morphometric data of third stage larvae are presented herein. The present study demonstrated that 40% of all the snails were infected by A. abstrusus. Achatina fulica specimens were collected from three different areas in Manaus namely: rural; east and west areas. The east area presents the highest prevalence of 80%. The large number of A.fulica found in inhabited areas increases the chances of emergent zoonoses, which highlights the need of further studies so as to better control this disease.

  3. Occurrence of Aelurostrongylus abstrusus (Railliet, 1898 larvae (Nematoda: Metastrongylidae infecting Achatina (Lissachatina fulica Bowdich, 1822 (Mollusca: Gastropoda in the Amazon region Ocorrência de Aelurostrongylus abstrusus (Railliet, 1898 (Nematoda: Metastrongylidae infectando o Achatina (Lissachatina fulica Bowdich, 1822 (Mollusca: Gastropoda na região amazônica

    Directory of Open Access Journals (Sweden)

    Sanny Maria de Andrade-Porto

    2012-06-01

    Full Text Available Achatina fulica or "giant African snail" is an exotic species, considered to be one of the world's hundred most invasive species, causing serious environmental damages. In the present study we report, for the first time, the occurrence of Aelurostrongylus abstrusus infecting A.fulica in the Amazon region. This nematode is described parasitizing mainly the pulmonary system of felines, which causes "aelurostrongilose", also known as feline cardio-pulmonary strongyloidosis. New morphometric data of third stage larvae are presented herein. The present study demonstrated that 40% of all the snails were infected by A. abstrusus. Achatina fulica specimens were collected from three different areas in Manaus namely: rural; east and west areas. The east area presents the highest prevalence of 80%. The large number of A.fulica found in inhabited areas increases the chances of emergent zoonoses, which highlights the need of further studies so as to better control this disease.Achatina fulica ou "caramujo africano" é uma espécie exótica, considerada uma das cem piores espécies invasoras do mundo, causando sérios danos ambientais. No presente estudo foi registrado, pela primeira vez, a ocorrência do Aelurostrongylus abstrusus infectando o A.fulica na região amazônica. Esse nematóide é descrito parasitando principalmente o sistema pulmonar de felinos, causando a "aelurostrongilose", também conhecida como estrongiloidose cardio-pulmonar felina. Novos dados morfométricos de larvas de terceiro estágio são apresentados. Dos 45 caramujos coletados, 40% estavam infectados por larvas de A. abstrusus. Especimens de Achatina fulica foram coletados em três áreas da cidade de Manaus: rural, leste e oeste. A zona leste apresentou a maior prevalência de 80%. O grande número de A.fulica encontrado em áreas habitadas aumenta as chances de ocorrência de zoonoses emergentes e destaca a necessidade de mais estudos para o melhor controle da doença.

  4. Bait formulations of molluscicides and their effects on biochemical changes in the ovotestis of snail Lymnaea acuminata (Mollusca; Gastropoda:Lymnaeidae) / Formulações de iscas de moluscicidas e seus efeitos sobre as alterações bioquímicas no ovoteste do caramujo Lymnaea acuminata (Mollusca;Gastropoda:Lymnaeidae)

    Scientific Electronic Library Online (English)

    Pradeep, Kumar; Vinay Kumar, Singh; D.K., Singh.

    2011-10-01

    Full Text Available SciELO Brazil | Language: English Abstract in portuguese Foi estudado o efeito subletal das iscas usadas para alimentação contendo componentes moluscicidas de Ferula asafoetida (ácido ferúlico, umbeliferone), Syzygium aromaticum (eugenol) e Carum carvi (limonene) nas alterações bioquímicas do ovoteste do caramujo Lymnaea acuminata. A formulação das iscas [...] usadas para alimentar L. acuminata foi estudada em aquários de vidros transparentes de diâmetro de 30 cm. As iscas foram preparadas por combinações diferentes binárias de aminoácidos (valina, ácido aspártico, lisina e alanina 10 mM) em 100 mL de solução de agar a 2% + doses subletais (20% e 60% durante 24 horas LC50) de diferentes moluscicidas (ácido ferúlico, umbeliferone, eugenol e limonene). Estas iscas causaram redução significante máxima em aminoácidos livres, proteínas, níveis de DNA e RNA isto é 41,37%, 23,56%, 48,36% e 14,29% de controle no ovoteste do caramujo, respectivamente. Discontinuação da alimentação depois do tratamento de 60% de 96 horas de LC50 do moluscicida contendo a isca para as subsequentes 72 horas causou significante recuperação dos níveis de aminoácidos livres, proteína, DNA e RNA no ovoteste da L. acuminata. Abstract in english The effect of sub-lethal feeding of bait formulations containing molluscicidal component of Ferula asafoetida (ferulic acid, umbelliferone), Syzygium aromaticum (eugenol) and Carum carvi (limonene) on biochemical changes in the ovotestis of snail Lymnaea acuminata were studied. Bait formulations fee [...] ding to L. acuminata were studied in clear glass aquaria having diameter of 30 cm. Baits were prepared from different binary combinations of attractant amino acid (valine, aspartic acid, lysine and alanine 10 mM) in 100 mL of 2% agar solution + sub-lethal (20% and 60% of 24h LC50) doses of different molluscicides (ferulic acid, umbelliferone, eugenol and limonene). These baits caused maximum significant reduction in free amino acid, protein, DNA, RNA levels i.e. 41.37, 23.56, 48.36 and 14.29% of control in the ovotestis of the snail, respectively. Discontinuation of feeding after treatment of 60% of 96h LC50 of molluscicide containing bait for next 72h caused a significant recovery in free amino acid, protein, DNA and RNA levels in the ovotestis of L. acuminata.

  5. Bait formulations of molluscicides and their effects on biochemical changes in the ovotestis of snail Lymnaea acuminata (Mollusca; Gastropoda:Lymnaeidae Formulações de iscas de moluscicidas e seus efeitos sobre as alterações bioquímicas no ovoteste do caramujo Lymnaea acuminata (Mollusca;Gastropoda:Lymnaeidae

    Directory of Open Access Journals (Sweden)

    Pradeep Kumar

    2011-10-01

    Full Text Available The effect of sub-lethal feeding of bait formulations containing molluscicidal component of Ferula asafoetida (ferulic acid, umbelliferone, Syzygium aromaticum (eugenol and Carum carvi (limonene on biochemical changes in the ovotestis of snail Lymnaea acuminata were studied. Bait formulations feeding to L. acuminata were studied in clear glass aquaria having diameter of 30 cm. Baits were prepared from different binary combinations of attractant amino acid (valine, aspartic acid, lysine and alanine 10 mM in 100 mL of 2% agar solution + sub-lethal (20% and 60% of 24h LC50 doses of different molluscicides (ferulic acid, umbelliferone, eugenol and limonene. These baits caused maximum significant reduction in free amino acid, protein, DNA, RNA levels i.e. 41.37, 23.56, 48.36 and 14.29% of control in the ovotestis of the snail, respectively. Discontinuation of feeding after treatment of 60% of 96h LC50 of molluscicide containing bait for next 72h caused a significant recovery in free amino acid, protein, DNA and RNA levels in the ovotestis of L. acuminata.Foi estudado o efeito subletal das iscas usadas para alimentação contendo componentes moluscicidas de Ferula asafoetida (ácido ferúlico, umbeliferone, Syzygium aromaticum (eugenol e Carum carvi (limonene nas alterações bioquímicas do ovoteste do caramujo Lymnaea acuminata. A formulação das iscas usadas para alimentar L. acuminata foi estudada em aquários de vidros transparentes de diâmetro de 30 cm. As iscas foram preparadas por combinações diferentes binárias de aminoácidos (valina, ácido aspártico, lisina e alanina 10 mM em 100 mL de solução de agar a 2% + doses subletais (20% e 60% durante 24 horas LC50 de diferentes moluscicidas (ácido ferúlico, umbeliferone, eugenol e limonene. Estas iscas causaram redução significante máxima em aminoácidos livres, proteínas, níveis de DNA e RNA isto é 41,37%, 23,56%, 48,36% e 14,29% de controle no ovoteste do caramujo, respectivamente. Discontinuação da alimentação depois do tratamento de 60% de 96 horas de LC50 do moluscicida contendo a isca para as subsequentes 72 horas causou significante recuperação dos níveis de aminoácidos livres, proteína, DNA e RNA no ovoteste da L. acuminata.

  6. Utilization of shells of the snail Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda by the hermit crab Clibanarius vittatus (Bosc, 1802 (Decapoda, Anomura in the São Vicente Estuary, São Paulo, Brazil Utilización de conchas de caracoles terrestres Achatina fulica Bowdich, 1822 (Mollusca, Gastropoda por el cangrejo ermitaño Clibanarius vittatus (Bosc, 1802 (Decapoda, Anomura en el estuario de São Vicente, São Paulo, Brasil

    Directory of Open Access Journals (Sweden)

    Bruno S. Sant'Anna

    2005-11-01

    Full Text Available Hermit crabs depend on mollusc shells for housing. In this study, an unusual resource is reported for a hermit crab that usually inhabits marine gastropod shells. During a field study conducted from May 2001 to April 2003 in an estuarine area in São Vicente, state of São Paulo, Brazil, 21 individuals of Clibanarius vittatus (Bosc, 1802 were found inhabiting the shells of the terrestrial gastropod Achatina fulica Bowdich, 1822. A. fulica occurs in nearshore grass patches, where occasional contact with sea water kills them, and their shells then become available to the hermit crabsEl cangrejo ermitaño depende de conchas de moluscos para hacer de ella su casa. Este estudio ha descubierto una manera inusual de como vive este cangrejo, que generalmente habita la concha de gastrópodos marinos. El estudio fue realizado en la estación marítima de São Vicente, provincia de São Paulo, de mayo de 2001 hasta abril de 2003. Durante ese periodo, un total de 21 cangrejos Clibanarius vittatus (Bosc, 1802 fueron encontrados viviendo en las conchas del caracol terrestre Achatina fulica Bowdich, 1822. A. fulica ocurre en áreas de césped cercanos a la costa, donde el contacto ocasional con el agua de mar provoca su muerte y sus conchas quedan disponibles para el cangrejo ermitaño

  7. EXPLOTACIÓN, USOS Y ESTADO ACTUAL DE LA CIGUA O BURGAO CITTARIUM PICA (MOLLUSCA: GASTROPODA: TROCHIDAE)EN LA COSTA CONTINENTAL DEL CARIBE COLOMBIANO / EXPLOITATION, USES AND CURRENT STATUS OF THE WEST INDIAN TOPSHELL CITTARIUM PICA (MOLLUSCA: GASTROPODA, TROCHIDAE) ALONG THE COLOMBIAN CARIBBEAN COAST

    Scientific Electronic Library Online (English)

    Adriana, Osorno Arango; Juan M., Díaz Merlano.

    2006-12-01

    Full Text Available La cigua o burgao, Cittarium pica es un gasterópodo común y conspicuo de la zona intermareal del litoral rocoso del Caribe y ha sido utilizado como alimento por el hombre desde tiempos precolombinos. Aunque la extracción del recurso es realizada únicamente por pescadores artesanales y principalmente [...] para autoconsumo de pobladores locales, su abundancia se ha visto reducida notablemente durante los últimos diez años, por lo que la especie hace parte de la lista roja de fauna amenazada en varios países caribeños, incluido Colombia. El presente estudio tuvo por objeto hacer un diagnóstico del estado actual de la población de C. pica a lo largo de la costa continental del Caribe colombiano, así como una caracterización general de los niveles de explotación y usos en tiempos recientes. Para ello, la costa Caribe colombiana se dividió en cinco sectores de acuerdo al rango de distribución establecida para la especie: 1-Urabá chocoano, 2-Isla Fuerte, 3-Cartagena e Islas del Rosario, 4-Santa Marta y Parque Nacional Natural Tayrona, 5-La Guajira. En cada uno de los sectores se efectuaron encuestas a los pobladores locales. Se realizaron muestreos en una serie de estaciones representativas con el fin de determinar la abundancia, densidad y estructura de tallas de la población de C. pica. La presión por extracción que se ejerce sobre el recurso es variable entre los sectores, siendo mayor en Santa Marta y Parque Nacional Natural Tayrona, Urabá chocoano, y Cartagena e Islas del Rosario. El uso principal que se da al recurso es como complemento de la dieta de los pobladores locales, aunque en algunas ocasiones éstos también comercializan la carne y la concha. Las conchas se venden a artesanos que elaboran con ella objetos de bisutería y "souvenirs". La densidad ecológica promedio en toda el área de estudio fue 5.38 Ind/m² (± 0.82), con diferencias significativas tanto entre los sectores como entre las estaciones de un mismo sector. La estructura de tallas de la población (talla promedio = 25.08 mm ± 4.71, moda = 11.10 mm) indica que en general el recurso está sometido a sobreexplotación en el Caribe colombiano. Con ello, se confirma que C. pica enfrenta un riesgo de extinción en el mediano plazo en Colombia y debe mantenerse en la categoría de "vulnerable" en la lista roja de especies amenazadas del mismo país. Abstract in english The West Indian topshell, Cittarium pica is a common and conspicuous gastropod that thrives in Caribbean intertidal rocky shores and has been used for food by men since pre-Columbian times. Although, the exploitation of this resource is practiced only by artisanal fishermen and mainly for self-consu [...] mption, its abundance has noticeably reduced in the last ten years, so the species has been included in the endangered animal lists of several Caribbean countries, including Colombia. The present study was carried out to assess the current status of the population of C. pica along the Colombian Caribbean mainland and to describe the overall exploitation level and uses of this resource in recent times. In order to achieve so, Colombian Caribbean coast was divided into five zones according to the established distribution range of the species: 1-Urabá chocoano, 2-Isla Fuerte, 3-Cartagena and Rosario Islands, 4-Santa Marta and Tayrona Natural National Park, 5-La Guajira. In each one of the zones opinion polls among local inhabitants were conducted. A series of samples from representative stations were obtained in order to determine the abundance, density and size structure of the C. pica population. The fishing pressure on the resource is different between the sectors, being greater in Santa Marta and Tayrona Natural National Park, Urabá chocoano, and Cartagena and Rosario Islands. The main use given to C. pica is as dietary complement of the local population, but the flesh and shells are commercialized at times. Shells are sold to artisans and used for "souvenirs" and handcraft manufactures. The mean ecological density of C. pica in the entire study

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

    Czech Academy of Sciences Publication Activity Database

    Faltýnková, Anna; Našincová, Vanda; Kablásková, Lenka

    2008-01-01

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

  9. Biogeographic and species richness patterns of Gastropoda on the southwestern Atlantic Biogeografia de gastrópodes no Atlântico Sul ocidental

    OpenAIRE

    Floeter, S. R.; Soares-gomes, A.

    1999-01-01

    Patterns of richness and biogeography of Gastropoda molluscs were determined based on lists of species from five sites along the southwestern Atlantic. The analysis of the distribution patterns of these sites confirmed the existence of a broader transition zone between southern Espírito Santo State (21°S) and Rio Grande do Sul State (32°S). This zone is very heterogeneous, presenting a low endemism rate and a significant number of species common to the near provinces, and does not show eno...

  10. Homonímia em Tiphiidae (Hymenoptera) / Homonymy in Tiphiidae (Hymenoptera)

    Scientific Electronic Library Online (English)

    Alice Fumi, Kumagai; Maria Christina de, Almeida; Vinalto, Graf.

    Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] Abstract in english A new name, Tiphiallen nom.n. is proposed for Allenella Genise, 1992 (Hymenoptera, Tiphiidae), preoccupied by Iredale, 1944 (Mollusca, Gastropoda). [...

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

    Scientific Electronic Library Online (English)

    Pedro, Romero; Rina, Ramírez.

    2011-08-01

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

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

    Directory of Open Access Journals (Sweden)

    FLOETER S. R.

    1999-01-01

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

  13. Introducción al estudio de los gasterópodos (Mollusca) de la laguna de Montcortès (Pallars Sobirà, Cataluña, NE de la península ibérica)

    OpenAIRE

    Bros, V.; Marti?nez-orti, A.

    2009-01-01

    Introduction to the study of gastropods (Mollusca) on the Montcortés lake (Pallars Sobirà, Catlonia, NE of the Iberian peninsula)The check-list of 50 species of terrestrial gastro­pod and freshwater molluscs in the Montcortès lake (Catalonia, Spain) and its environs, pertaining to 24 different families, is shown. Thirty-three species are cited for the first time in the area of study. The unpublished data on their distribution and ecological requirements are contributed. The preliminary re...

  14. ???????? ??????? ?? ?????? ??????? ? ?????? ??????

    OpenAIRE

    Al Khayat. J. L. [???? ??? ???? ??????

    1997-01-01

    The species composition of the mollusca community in the Qatari waters of the Arabian Gulf, is reported. Data were obtained from analysis of samples collected during 1996 - 1997. A total of 246 species were recorded, including 115 Gastropoda, 124 Bivalvia, 4 Scaphopoda and 3 Polyplacophora. This study provides the first comprehensive list of mollusca species occurring in the Qatari waters.

  15. 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)

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

    2008-03-30

    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.

  16. Korttermynbedreigings vir varswater-Mollusca in die Olifantsrivier en enkele sytakke

    Directory of Open Access Journals (Sweden)

    Kenné N. de Kock

    2013-06-01

    Full Text Available Die bewaringstatus van minder as 2% van die ongeveer 7000 molluskspesies bekend wêreldwyd, is tot dusver behoorlik geassesseer. Gevolglik is die algemene vlak van bedreiging vir molluske power gedokumenteer en hoogs waarskynlik onderskat. Varswatermolluske is permanente waterbewoners wat oor beperkte voortbewegingsvermoë beskik en aan ’n verskeidenheid van antropogeniese afvalstowwe blootgestel word omdat waterbronne dikwels as stortplek vir ’n groot verskeidenheid van nadelige besoedelstowwe gebruik word. Die Olifantsrivier word dikwels as een van die mees getransformeerde riviere in Suider-Afrika beskryf en word toenemend aan uitermate hoë druk onderwerp betreffende natuurlike hulpbronne en die geassosieerde landelike versteurings, asook besoedeling. Omdat min inligting oor die diversiteit van Mollusca in die Olifantsrivier op rekord is, is in die huidige studie vier opnames tydens twee opeenvolgende jare gemaak van die molluske in die Olifantsrivier en geselekteerde sytakke by onderskeidelik drie lokaliteite op die Hoëveld en vier in die Laeveld. Die pH en elektriese geleidingsvermoë van die water is by elk van die lokaliteite bepaal en het gewissel tussen 6.93 en 9.50, en 110 µS en 1336 µS, vir pH en geleidingsvermoë onderskeidelik. ’n Totaal van 25 molluskspesies is tydens die vier opnames versamel wat die eksotiese indringerspesies Lymnaea columella, Physa acuta, Aplexa marmorata en Tarebia granifera insluit. Laasgenoemde spesie het verreweg die grootste getal eksemplare in totaal opgelewer, hoofsaaklik by ’n lokaliteit wat as grootliks getransformeerd beskryf kan word. Die resultate van hierdie ondersoek kan as basis vir toekomstige opnames dien om die impak van antropogeniese versteurings op die diversiteit van die Mollusca in die Olifantsrivier- en opvanggebied te evalueer.Short-term threats for the sustained survival of freshwater Mollusca in the Olifants River and selected tributaries. The conservation status of less than 2% of the more or less 7000 mollusk species known worldwide have been properly assessed. Consequently the general level of imperilment is poorly documented and almost certainly underestimated. Freshwater mollusks live permanently in water, have limited means of movement and are exposed to a variety of anthropogenic waste products due to the fact that waterbodies often act as sinks for a large array of harmful pollutants. The Olifants River is often described as one of the most polluted rivers in Southern Africa and is progressively subjected to extremely high pressure with regard to natural resources and associated rural transformation and pollution. Little is on record regarding the diversity of the Mollusca in the Olifants River; therefore, in the present study, four surveys of the molluscs were conducted in this river and selected tributaries during two consecutive years at three localities situated on the Highveld and four localities situated in the Lowveld respectively. The pH and electric conductivity of the water were determined during each survey at each one of the localities and values ranged from 6.93 to 9.50, and 110 µS to 1336 µS, for pH and conductivity respectively. A total of 25 mollusk species were collected during the four surveys which included the exotic invader species Lymnaea columella, Physa acuta, Aplexa marmorata and Tarebia granifera. The latter species yielded the highest number of specimens by far, mainly at a locality which could be described as largely transformed. The results of this investigation can serve as a point of departure for future surveys to evaluate the impact of anthropogenic disturbances on the mollusc diversity in the Olifants River and catchment.

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

    Directory of Open Access Journals (Sweden)

    Pedro Romero

    2011-08-01

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

  18. The complete mitochondrial genome of the mudsnail Cipangopaludina cathayensis (Gastropoda: Viviparidae).

    Science.gov (United States)

    Yang, Huirong; Zhang, Jia-En; Luo, Hao; Luo, Mingzhu; Guo, Jing; Deng, Zhixin; Zhao, Benliang

    2014-10-16

    Abstract We present the complete mitochondrial genome of Cipangopaludina cathayensis in this study. The mitochondrial genome is 17,157?bp in length, containing 13 protein-coding genes, 2 rRNA genes, 22 tRNA genes. All of them are encoded on the heavy strand except 7 tRNA genes on the light strand. Overall nucleotide compositions of the light strand are 44.51% of A, 26.74% of T, 20.48% of C and 8.28% of G. All the protein-coding genes start with ATG initiation codon except ATP6 with ATA and ND4 with TTG, and 2 types of termination codons are TAA (ATP6, ND2, COX1, COX2, ATP8, ND1, ND6, Cytb, COX3, ND4) and TAG (ND4L, ND5, ND3). There are 29 intergenic spacers and 5 gene overlaps. The tandem repeat sequences are observed in COX2, tRNA(Asp), ATP6, tRNA(Cys), S-rRNA, ND1, Cytb, ND4 and COX3 genes. Gene arrangement and distribution are different from the typical vertebrates. The absence of D-loop is consistent with the Gastropoda, but at least one lengthy non-coding region is essential regulatory element for the initiation of transcription and replication. PMID:25319293

  19. Ross Sea Mollusca from the Latitudinal Gradient Program: R/V Italica 2004 Rauschert dredge samples.

    Science.gov (United States)

    Ghiglione, Claudio; Alvaro, Maria Chiara; Griffiths, Huw J; Linse, Katrin; Schiaparelli, Stefano

    2013-01-01

    Information regarding the molluscs in this dataset is based on the Rauschert dredge samples collected during the Latitudinal Gradient Program (LGP) on board the R/V "Italica" in the Ross Sea (Antarctica) in the austral summer 2004. A total of 18 epibenthic dredge deployments/samplings have been performed at four different locations at depths ranging from 84 to 515m by using a Rauschert dredge with a mesh size of 500?m. In total 8,359 specimens have been collected belonging to a total of 161 species. Considering this dataset in terms of occurrences, it corresponds to 505 discrete distributional records (incidence data). Of these, in order of abundance, 5,965 specimens were Gastropoda (accounting for 113 species), 1,323 were Bivalvia (accounting for 36 species), 949 were Aplacophora (accounting for 7 species), 74 specimens were Scaphopoda (3 species), 38 were Monoplacophora (1 species) and, finally, 10 specimens were Polyplacophora (1 species). This data set represents the first large-scale survey of benthic micro-molluscs for the area and provides important information about the distribution of several species, which have been seldom or never recorded before in the Ross Sea. All vouchers are permanently stored at the Italian National Antarctic Museum (MNA), Section of Genoa, enabling future comparison and crosschecking. This material is also currently under study, from a molecular point of view, by the barcoding project "BAMBi" (PNRA 2010/A1.10). PMID:24146597

  20. Comparative mapping of GABA-immunoreactive neurons in the central nervous systems of nudibranch molluscs.

    Science.gov (United States)

    Gunaratne, Charuni A; Sakurai, Akira; Katz, Paul S

    2014-03-01

    The relative simplicity of certain invertebrate nervous systems, such as those of gastropod molluscs, allows behaviors to be dissected at the level of small neural circuits composed of individually identifiable neurons. Elucidating the neurotransmitter phenotype of neurons in neural circuits is important for understanding how those neural circuits function. In this study, we examined the distribution of ?-aminobutyric-acid;-immunoreactive (GABA-ir) neurons in four species of sea slugs (Mollusca, Gastropoda, Opisthobranchia, Nudibranchia): Tritonia diomedea, Melibe leonina, Dendronotus iris, and Hermissenda crassicornis. We found consistent patterns of GABA immunoreactivity in the pedal and cerebral-pleural ganglia across species. In particular, there were bilateral clusters in the lateral and medial regions of the dorsal surface of the cerebral ganglia as well as a cluster on the ventral surface of the pedal ganglia. There were also individual GABA-ir neurons that were recognizable across species. The invariant presence of these individual neurons and clusters suggests that they are homologous, although there were interspecies differences in the numbers of neurons in the clusters. The GABAergic system was largely restricted to the central nervous system, with the majority of axons confined to ganglionic connectives and commissures, suggesting a central, integrative role for GABA. GABA was a candidate inhibitory neurotransmitter for neurons in central pattern generator (CPG) circuits underlying swimming behaviors in these species, however none of the known swim CPG neurons were GABA-ir. Although the functions of these GABA-ir neurons are not known, it is clear that their presence has been strongly conserved across nudibranchs. PMID:24638845

  1. New Records for GASTROPODA Class of Species Found in the Rocky Intertidal Zone of the Marine Priority Region 32, Guerrero, Mexico

    OpenAIRE

    Carmina Torreblanca-Ramírez; Rafael Flores-Garza; Jesús Emilio Michel-Morfin; José Luis Rosas-Acevedo; Pedro Flores-Rodríguez; Sergio García-Ibáñez

    2014-01-01

    The GASTROPODA class, one of the best known marine environments, is formed by a large number of species and the shape of their shell structure varies greatly. These mollusks are distributed from the intertidal zone all the way to the abyssal zone, and there are also swimming and floating species. This research was conducted at seven sites, located in the Marina Priority Region 32 (MPR 32), located in the State of Guerrero, Mexico. The aim of this report is to document t...

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

    OpenAIRE

    Rivera–ingraham, G. A.; Espinosa, F.; Garci?a–go?mez, J. C.

    2011-01-01

    Cymbula nigra (Gastropoda, Patellidae) is a threatened giant patellid limpet found on the North African coast from Namibia to Algeria. The objective of this study was to estimate the total number of individuals present in Ceuta (Strait of Gibraltar) and to determine the effect of certain physical parameters on population structure and abundance. Between 2006 and 2010 we conducted an exhaustive census in the area. Results indicate that Ceuta could be home to 48,473 individuals. The most import...

  3. Genetic divergence and geographic variation in the deep-water Conus orbignyi complex (Mollusca: Conoidea).

    Science.gov (United States)

    Puillandre, Nicolas; Meyer, Christopher P; Bouchet, Philippe; Olivera, Baldomero M

    2011-07-01

    Puillandre, N. et al. (2010) Genetic divergence and geographic variation in a deep-water cone lineage: molecular and morphological analyses of the Conus orbignyi complex (Mollusca: Conoidea).The cone snails (family Conidae) are a hyperdiverse lineage of venomous gastropods. Two standard markers, COI and ITS2, were used to define six genetically-divergent groups within a subclade of Conidae that includes Conus orbignyi; each of these was then evaluated based on their shell morphology. We conclude that three forms, previously regarded as subspecies of Conus orbignyi are distinct species, now recognized as Conus orbignyi, Conus elokismenos and Conus coriolisi. In addition, three additional species (Conus pseudorbignyi, Conus joliveti and Conus comatosa) belong to this clade. Some of the proposed species (e.g., Conus elokismenos) are possibly in turn complexes comprising multiple species. Groups such as Conidae illustrate the challenges generally faced in species delimitation in biodiverse lineages. In the case of the Conus orbignyi complex, not only are there definable, genetically divergent lineages, but also considerable geographic variation within each group. Our study suggests that an intensive analysis of multiple specimens within a single locality helps to minimize the confounding effects of geographic variation and can be a useful starting point for circumscribing different species within such a confusing complex. PMID:21712968

  4. Natural infection of Deroceras laeve (Mollusca: gastropoda with metastrongylid larvae in a transmission focus of abdominal angiostrongyliasis Infecção natural de Deroceras laeve com larvas de metastrongilídeos em um foco de transmissão da angiostrongilíase abdominal

    Directory of Open Access Journals (Sweden)

    Rafael Lucyk MAURER

    2002-02-01

    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.Angiostrongylus costaricensis é um nematódeo parasita de roedores. O homem pode se infectar pela ingestão da larva de terceiro estágio produzida nos hospedeiros intermediários, geralmente lesmas da família Veronicellidae. Em estudo epidemiológico em curso numa localidade no sul do Brasil (oeste do Estado de Santa Catarina onde aquelas lesmas constituem praga agrícola e importantes vetores do A. costaricensis, documentou-se pela primeira vez a infecção natural de Deroceras laeve com larvas de metastrongilídeos. Este pequeno limacídeo é freqüentemente encontrado entre as dobras de folhas de verduras e pode ser ingerido inadvertidamente. É possível que tenha um papel importante na transmissão de A. costaricensis para o homem.

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

    Scientific Electronic Library Online (English)

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

    2007-12-01

    Full Text Available 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

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

    Scientific Electronic Library Online (English)

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

    1127-11-01

    Full Text Available El caracol rosado S. gigas, es una especie de gran importancia pesquera en la región del Caribe que incluye la Península de Yucatán, en la cual, se analizó la diversidad y estructura genética de dos poblaciones (Arrecife Alacranes y Banco Chinchorro) mediante el uso de cinco marcadores moleculares 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.

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

    Directory of Open Access Journals (Sweden)

    Roberto Zamora-Bustillos

    2011-09-01

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

  8. Diversidad y microestructura de quitones (Mollusca: Polyplacophora) del Caribe de Costa Rica

    Scientific Electronic Library Online (English)

    Cedar I, García-Ríos; Migdalia, Álvarez-Ruiz.

    2011-03-01

    Full Text Available Los poliplacóforos asociados a los arrecifes de coral en la costa caribeña de Costa Rica han sido poco estudiados. El examen del cascajo de coral acumulado en el sublitoral somero, en cuatro estaciones de colección, localizadas en la Provincia de Limón reveló una diversidad de quitones mayor a la do [...] cumentada. Anteriormente se habían registrado ocho especies para el Caribe costaricense: Ischnochiton erythronotus (C.B. Adams, 1845); Ischnoplax pectinata (Sowerby 1840); Stenoplax boogii (Haddon, 1886); S. purpurascens (C.B. Adams, 1845); Acanthopleura granulata (Gmelin, 1791); Chiton marmoratus Gmelin, 1791; C. tuberculatus Linnaeus, 1758; Acanthochitona rhodea (Pilsbry, 1893). Otras cinco se registran aquí por primera vez: Callistochiton portobelensis Ferreira 1976; Ischnochiton kaasi Ferreira 1987; I. pseudovirgatus Kaas 1972; Acanthochitona balesae Abbott 1954; Cryptoconchus floridanus (Dall 1889). Abstract in english Diversity and microstructure of quitons (Mollusca: Polyplacophora) from the Caribbean of Costa Rica. The polyplacophorans of the coral reef on the Caribbean coast of Costa Rica have been insufficiently studied. The examination of coral rubble accumulated in the shallow sublitoral waters on four coll [...] ection stations in Provincia Limón revealed a higher diversity of chitons than was documented. From the country eight species were previously known: Ischnochiton erythronotus (C.B. Adams 1845); Ischnoplax pectinata (Sowerby 1840); Stenoplax boogii (Haddon 1886); S. purpurascens (C.B. Adams 1845); Acanthopleura granulate (Gmelin 1791); Chiton marmoratus Gmelin 1791; C. tuberculatus Linnaeus 1758 and Acanthochitona rhodea (Pilsbry 1893). This study added five more species that are reported here for the first time: Callistochiton portobelensis Ferreira 1976; Ischnochiton kaasi Ferreira 1987; I. pseudovirgatus Kaas 1972; Acanthochitona balesae Abbott 1954 and Cryptoconchus floridanus (Dall 1889). Rev. Biol. Trop. 59 (1): 129-136. Epub 2011 March 01.

  9. Comparative mitogenomic analysis reveals cryptic species: A case study in Mactridae (Mollusca: Bivalvia).

    Science.gov (United States)

    Shen, Xin; Meng, Xue Ping; Chu, Ka Hou; Zhao, Na Na; Tian, Mei; Liang, Meng; Hao, Jue

    2014-12-01

    The Chinese surf clam Mactra chinensis Philippi, 1846 is a commercially important marine bivalve belonging to the family Mactridae (Mollusca: Bivalvia). In this study, the M. chinensis mitochondrial genomic features are analyzed. The genome has 34 genes on the same strand, lacking atp8 and both trnS (trnS1 and trnS2) as compared with the typical gene content of metazoan mitochondrial genomes. The A+T content of M. chinensis mitochondrial genome is 63.72%, which is slightly lower than that of M. veneriformis (67.59%) and Coelomactra antiquata (64.33% and 64.14% for the samples from Ri Zhao, Shandong Province, and Zhang Zhou, Fujian Province, China, respectively) in the same family. There are 22 NCRs in the M. chinensis mitochondrial genome, accounting for 12.91% of the genome length. The longest NCR (1,075bp in length) is located between trnT and trnQ. A TRS (127bp×8.15) accounts for 96.3% (1,035/1,075) of this NCR. The occurrence of TRS in NCR is shared by the two Mactra mitochondrial genomes, but is not found in the two Coelomactra mitochondrial genomes. A phylogenetic tree constructed based on 12 PCGs of 25 bivalve mitochondrial genomes shows that all seven genera (Mactra, Coelomactra, Paphia, Meretrix, Solen, Mytilus, and Crassostrea) constitute monophyletic groups with very high support values. Pairwise genetic distance analyses indicate that the genetic distance of C. antiquata from the two localities is 0.084, which is greater than values between congeneric species, such as those in Mactra, Mytilus, Meretrix, and Crassostrea. The results show that the C. antiquata from the two localities represent cryptic species. PMID:25247670

  10. The Complete Sequence of the Mitochondrial Genome of the Chamberednautilus (Mollusca: Cephalopoda)

    Energy Technology Data Exchange (ETDEWEB)

    Boore, Jeffrey L.

    2005-12-01

    Background: Mitochondria contain small genomes that arephysically separate from those of nuclei. Their comparison serves as amodel system for understanding the processes of genome evolution.Although complete mitochondrial genome sequences have been reported formore than 600 animals, the taxonomic sampling is highly biased towardvertebrates and arthropods, leaving much of the diversity yetuncharacterized. Results: The mitochondrial genome of a cephalopodmollusk, the Chambered Nautilus, is 16,258 nts in length and 59.5 percentA+T, both values that are typical of animal mitochondrial genomes. Itcontains the 37 genes that are typical for animal mtDNAs, with 15 on oneDNA strand and 22 on the other. The arrangement of these genes can bederived from that of the distantly related Katharina tunicata (Mollusca:Polyplacophora) by a switch in position of two large blocks of genes andtranspositions of four tRNA genes. There is strong skew in thedistribution of nucleotides between the two strands. There are an unusualnumber of non-coding regions and their function, if any, is not known;however, several of these demark abrupt shifts in nucleotide skew,suggesting that they may play roles in transcription and/or replication.One of the non-coding regions contains multiple repeats of a tRNA-likesequence. Some of the tRNA genes appear to overlap on the same strand,but this could be resolved if the polycistron were cleaved at thebeginning of the downstream gene, followed by polyadenylation of theproduct of the upstream gene to form a fully paired structure.Conclusions: Nautilus sp. mtDNA contains an expected gene content thathas experienced few rearrangements since the evolutionary split betweencephalopods and polyplacophorans. It contains an unusual number ofnon-coding regions, especially considering that these otherwise often aregenerated by the same processes that produce gene rearrangements. Thisappears to be yet another case where polyadenylation of mitochondrialtRNAs restores what would otherwise bean incompletestructure.

  11. Diversidad y microestructura de quitones (Mollusca: Polyplacophora del Caribe de Costa Rica

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    Cedar I García-Ríos

    2011-03-01

    Full Text Available Los poliplacóforos asociados a los arrecifes de coral en la costa caribeña de Costa Rica han sido poco estudiados. El examen del cascajo de coral acumulado en el sublitoral somero, en cuatro estaciones de colección, localizadas en la Provincia de Limón reveló una diversidad de quitones mayor a la documentada. Anteriormente se habían registrado ocho especies para el Caribe costaricense: Ischnochiton erythronotus (C.B. Adams, 1845; Ischnoplax pectinata (Sowerby 1840; Stenoplax boogii (Haddon, 1886; S. purpurascens (C.B. Adams, 1845; Acanthopleura granulata (Gmelin, 1791; Chiton marmoratus Gmelin, 1791; C. tuberculatus Linnaeus, 1758; Acanthochitona rhodea (Pilsbry, 1893. Otras cinco se registran aquí por primera vez: Callistochiton portobelensis Ferreira 1976; Ischnochiton kaasi Ferreira 1987; I. pseudovirgatus Kaas 1972; Acanthochitona balesae Abbott 1954; Cryptoconchus floridanus (Dall 1889.Diversity and microstructure of quitons (Mollusca: Polyplacophora from the Caribbean of Costa Rica. The polyplacophorans of the coral reef on the Caribbean coast of Costa Rica have been insufficiently studied. The examination of coral rubble accumulated in the shallow sublitoral waters on four collection stations in Provincia Limón revealed a higher diversity of chitons than was documented. From the country eight species were previously known: Ischnochiton erythronotus (C.B. Adams 1845; Ischnoplax pectinata (Sowerby 1840; Stenoplax boogii (Haddon 1886; S. purpurascens (C.B. Adams 1845; Acanthopleura granulate (Gmelin 1791; Chiton marmoratus Gmelin 1791; C. tuberculatus Linnaeus 1758 and Acanthochitona rhodea (Pilsbry 1893. This study added five more species that are reported here for the first time: Callistochiton portobelensis Ferreira 1976; Ischnochiton kaasi Ferreira 1987; I. pseudovirgatus Kaas 1972; Acanthochitona balesae Abbott 1954 and Cryptoconchus floridanus (Dall 1889. Rev. Biol. Trop. 59 (1: 129-136. Epub 2011 March 01.

  12. An SCD gene from the Mollusca and its upregulation in carotenoid-enriched scallops.

    Science.gov (United States)

    Li, Xue; Ning, Xianhui; Dou, Jinzhuang; Yu, Qian; Wang, Shuyue; Zhang, Lingling; Wang, Shi; Hu, Xiaoli; Bao, Zhenmin

    2015-06-10

    Carotenoids are a diverse group of red, orange, and yellow pigments that act as vitamin A precursors and antioxidants. Animals can only obtain carotenoids through their diets. Amongst the carotenoids identified in nature, over one third are of marine origin, but current research on carotenoid absorption in marine species is limited. Bivalves possess an adductor muscle, which is normally white in scallops. However, a new variety of Yesso scallop (Patinopecten yessoensis), the 'Haida golden scallop', can be distinguished by its adductor muscle's orange colour, which is caused by carotenoid accumulation. Studying the genes related to carotenoid accumulation in this scallop could benefit our understanding of the mechanisms underlying carotenoid absorption in marine organisms, and it could further improve scallop breeding for carotenoid content. Stearoyl-CoA desaturase (SCD) is the rate-limiting enzyme in the production of monounsaturated fatty acids, which enhance carotenoid absorption. Here, the full-length cDNA and genomic DNA sequences of the SCD gene from the Yesso scallop (PySCD) were obtained. The PySCD gene consisted of four exons and three introns, and it contained a 990-bp open reading frame encoding 329 amino acids. It was ubiquitously expressed in adult tissues, embryos and larvae of both white Yesso scallops and 'Haida golden' scallops. Although the expression pattern of PySCD in both types of scallops was similar, significantly more PySCD transcripts were detected in the 'Haida golden' scallops than in the white scallops. Elevated PySCD expression was found in tissues including the adductor muscle, digestive gland, and gonad, as well as in veliger larvae. This study represents the first characterisation of an SCD gene from the Mollusca. Our data imply that PySCD functions in multiple biological processes, and it might be involved in carotenoid accumulation. PMID:25816753

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

    Scientific Electronic Library Online (English)

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

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

  14. Influência do jejum severo sobre o conteúdo de proteínas totais e de amônio na hemolinfa de Bradybaena similaris (Fèrussac) (Mollusca, Gastropoda, Xanthonychidae) / Influence of the starvation on the total proteins and ammonia contents in the hemolymph of Bradybaena similaris (Fèrussac) (Gastropoda)

    Scientific Electronic Library Online (English)

    Claudia R.S. de, Lira; Edna M., Gomes; Generoso M., Chagas; Jairo, Pinheiro.

    2000-12-01

    Full Text Available [...] Abstract in english The total protein and ammonia contents in the hemolymph of Bradybaena similaris (Fèrussac, 1821) during the starvation were determined from August, 1996 to March, 1998. The results revealed a significant variation in the total protein content throughout the period of starvation analized, there being [...] a negative relation between the total protein content and the time of starvation. But the same result was not observed in the ammonia content. After 30 days of starvation there was a reduction of 2,8% of the content of ammonia in the hemolymph. A negative relation between the ammonia content and the time of starvation was observed, but this relation was not significative. It is probable that the degradation of the proteins don't lead to an increase of the ammonia in the hemolymph of the snail. It indicates that the increase on the nitrogenous products of degradation, caused by the degradation of the proteins, is detoxified as urea or uric acid.

  15. Abundancia y estructura de tallas de Nerita funiculata (Mollusca: Gastrópoda: Neritidae) en la zona intermareal de las Islas de la Bahía de Navachiste, Sinaloa, México / Abundance and size structure of Nerita funiculata (Mollusca: Gastropoda: Neritidae) in the intertidal zone of the Navachiste Bay islands, Sinaloa, Mexico

    Scientific Electronic Library Online (English)

    Juan Francisco, Arzola-González; Domenico, Voltolina; Yecenia, Gutiérrez-Rubio; Luis Miguel, Flores-Campaña.

    2013-08-01

    Full Text Available SciELO Mexico | Language: Spanish Abstract in spanish Se determinaron la densidad media anual y las distribuciones de talla y peso del gasterópodo Nerita funiculata en seis islas de la Bahía de Navachiste (Sinaloa, México). Las densidades fueron mayores en las islas San Lucas y La Huitussera (28.3 ± 1.8 y 26.8 ± 2.2 ind m?2) que en La Mapachera (11.0 ± [...] 2.4 ind m?). La longitud total (LT) media fue mayor en Guasayeye (16.61 ± 2.36 mm) y las menores fueron en San Lucas y Tesobiate (14.67 ± 2.06 y 14.66 ± 2.36 mm). Las LT medias mensuales variaron entre 13.95 ± 1.87 y 13.96 ± 2.44 (Tesobiate y San Lucas) y 18.85 ± 1.98 mm (Guasayeye). La relación entre LT y PT (peso total en gramos): PT = 0.0014 LT2.518, indicó crecimiento alométrico negativo. Abstract in english The annual mean density and the weight and size distribution of the gastropod Nerita funiculata were recorded for six islands of Navachiste Bay (Sinaloa, Mexico). The densities were greater in San Lucas and La Huitussera (28.3 ± 1.8 and 26.8 ± 2.2 ind m?2) than in La Mapachera (11.0 ± 2.4 ind m?2). [...] The mean total length (TL) was greater in Guasayeye (16.61 ± 2.36 mm) and lower values were recorded in San Lucas and Tesobiate (14.67 ± 2.06 and 14.66 ± 2.36 mm). The monthly mean TL varied between 13.95 ± 1.87 and 13.96 ± 2.44 (Tesobiate and San Lucas) and 18.85 ± 1.98 mm (Guasayeye). The relationship between TL and TW (total weight in grams): TW = 0.0014 TL2.518, indicated a negative allometric growth.

  16. Astronotus ocellatus (Cichlidae: Pisces) and Macropodus opercularis (Anabatidae: Pisces) as predators of immature Aedes fluviatilis (Diptera: Culicidae) and Biomphalaria glabrata (Mollusca: Planorbidae)

    OpenAIRE

    Consoli, Rotraut A. G. B.; Guimara?es, Carlos T.; Do Carmo, Jacqueline A.; Soares, Delza M.; Dos Santos, Jose? S.

    1991-01-01

    Two fish species, Astronotus ocellatus (Cichlidae) and Macropodus opercularis (Anabatidae) were tested for predacious behavior toward immature mosquitoes (Aedes fluviatili9s, Diptera: Culicidae) and schistosomiasis snail hosts (Biomphalaria glabrata, Mollusca: Planorbidae), in the presence or absence of non-living food and laboratory conditions. A. ocellatus, a species indigenous to Brazil, was a very efficient predator of both organisms (alpha=1,05); M. operculatis, an exotic species, preyed...

  17. Tolerance to air exposure of the New Zealand mudsnail Potamopyrgus antipodarum (Hydrobiidae, Mollusca) as a prerequisite to survival in overland translocations

    OpenAIRE

    Alvaro Alonso; Pilar Castro-Díez

    2013-01-01

    Spreading throughout a new ecosystem is the last step of an exotic species to become invasive. In the case of invasive aquatic molluscs, tolerance to air exposure is one of the main mechanisms allowing overland translocation and spreading. The mudsnail Potamopyrgus antipodarum (Hydrobiidae, Mollusca) is native to New Zealand but it has spread worldwide, invading ecosystems in Europe, Australia, America and Asia. The aim of our study is to assess mudsnail tolerance to air exposure, which may c...

  18. Introducción al estudio de los gasterópodos (Mollusca de la laguna de Montcortès (Pallars Sobirà, Cataluña, NE de la península ibérica

    Directory of Open Access Journals (Sweden)

    V. Bros

    2009-01-01

    Full Text Available Introduction to the study of gastropods (Mollusca on the Montcortés lake (Pallars Sobirà, Catlonia, NE of the Iberian peninsulaThe check-list of 50 species of terrestrial gastro­pod and freshwater molluscs in the Montcortès lake (Catalonia, Spain and its environs, pertaining to 24 different families, is shown. Thirty-three species are cited for the first time in the area of study. The unpublished data on their distribution and ecological requirements are contributed. The preliminary results indicate us that the communities of molluscs that accompany to the helofitic vegetation and the higrofits well are formed with elements of high faunistic and ecological interest. Simultaneously, some recommendations for the protection of the malacological fauna of the lake are commented.

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

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    Lenin Arias-Rodriguez

    2007-12-01

    Full Text Available El cariotipo de Plicopurpura pansa y P. columellaris fue determinado a partir de 17 y 13 especímenes adultos respectivamente. Adicionalmente, se utilizaron ocho cápsulas de P. pansa. Contamos 186 campos mitóticos en P. pansa: 59 en los adultos y 127 en los embriones; y 118 campos en P. columellaris. En ambas especies se observaron números cromosómicos desde 30 hasta 42. Las variaciones en número cromosómico fueron identificadas en cada individuo, no habiendo ninguna relación con los tejidos (branquias, músculo y estómago empleados. El número modal diploide típico fue de 2n=36 cromosomas en ambas especies. En los especímenes adultos seleccionamos cinco de las mejores dispersiones cromosómicas para armar el cariotipo. Calculamos los estadísticos citogenéticos clásicos, longitudes relativas, proporción de brazos, índice centromérico y la diferencia entre brazos. Identificamos en ambas especies tres pares de cromosomas metacéntricos y quince pares de cromosomas telocéntricos. Esta clasificación no fue suficientemente robusta, por lo que dividimos el complemento cromosómico de cada especie en cuatro grupos ("a", "b", "c" y "d" utilizando como criterio las longitudes relativas (p+q. Hubo diferencias significativas entre grupos cromosómicos por especie y entre especies, los tres primeros pares de cromosomas (grupo "a" birrámeos y los dos últimos pares (grupo "d" monorrámeos menores (análisis de varianza de dos vías, pKaryotypes 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 embryos 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<0.05. Significant differences were identified among chromosome groups in each species; the differences between species were given by the first three pairs of chromosomes (group "a" biarmed and the last two pairs (group "d" uniarmed. Deviations in chromosome number and relative lengths probably are given by chromosome rearrangements, related with chromosome polymorphism and presence of the atypical microchromosome "B". The fundamental number in both species was characterized by 42 chromosome arms. No sex chromosomes were identified. Rev. Biol. Trop. 55 (3-4: 853-866. Epub 2007 December, 28.

  20. The complete sequence of the mitochondrial genome of Nautilus macromphalus (Mollusca: Cephalopoda

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    Boore Jeffrey L

    2006-07-01

    Full Text Available Abstract Background Mitochondria contain small genomes that are physically separate from those of nuclei. Their comparison serves as a model system for understanding the processes of genome evolution. Although complete mitochondrial genome sequences have been reported for more than 600 animals, the taxonomic sampling is highly biased toward vertebrates and arthropods, leaving much of the diversity yet uncharacterized. Results The mitochondrial genome of the bellybutton nautilus, Nautilus macromphalus, a cephalopod mollusk, is 16,258 nts in length and 59.5% A+T, both values that are typical of animal mitochondrial genomes. It contains the 37 genes that are almost universally found in animal mtDNAs, with 15 on one DNA strand and 22 on the other. The arrangement of these genes can be derived from that of the distantly related Katharina tunicata (Mollusca: Polyplacophora by a switch in position of two large blocks of genes and transpositions of four tRNA genes. There is strong skew in the distribution of nucleotides between the two strands, and analysis of this yields insight into modes of transcription and replication. There is an unusual number of non-coding regions and their function, if any, is not known; however, several of these demark abrupt shifts in nucleotide skew, and there are several identical sequence elements at these junctions, suggesting that they may play roles in transcription and/or replication. One of the non-coding regions contains multiple repeats of a tRNA-like sequence. Some of the tRNA genes appear to overlap on the same strand, but this could be resolved if the polycistron were cleaved at the beginning of the downstream gene, followed by polyadenylation of the product of the upstream gene to form a fully paired structure. Conclusion Nautilus macromphalus mtDNA contains an expected gene content that has experienced few rearrangements since the evolutionary split between cephalopods and polyplacophorans. It contains an unusual number of non-coding regions, especially considering that these otherwise often are generated by the same processes that produce gene rearrangements. The skew in nucleotide composition between the two strands is strong and associated with the direction of transcription in various parts of the genomes, but a comparison with K. tunicata implies that mutational bias during replication also plays a role. This appears to be yet another case where polyadenylation of mitochondrial tRNAs restores what would otherwise be an incomplete structure.

  1. Comparative morphology among representatives of main taxa of Scaphopoda and basal protobranch Bivalvia (Mollusca

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    Luiz Ricardo L. Simone

    2009-01-01

    Full Text Available This study deals with detailed morphology and anatomy of 4 species of Scaphopoda and 5 species of protobranch Bivalvia. Both classes are traditionally grouped in the taxon Diasoma, which has been questioned by different methodologies, such as molecular and developmental. This study is developed under a phylogenetic methodology with the main concern in performing it in an intelligible and testable methodology. The analyzed Scaphopoda species came from the Brazilian coast and belong to the family Dentaliidae [(1 Coccodentalium carduus; (2 Paradentalium disparile] and Gadiliidae; [(3 Polyschides noronhensis, n. sp. from Fernando de Noronha Archipelago; (4 Gadila braziliensis]. These species represent the main branches of the class Scaphopoda. From protobranch bivalves, representatives of the families Solemyidae [(5 Solemya occidentalis, from Florida; S. notialis, n. sp. from S.E. Brazil], Nuculanidae [(6 Propeleda carpentieri from Florida], and Nuculidae [(7 Ennucula puelcha, from south Brazil] are included. These species represent the main branches of the basal Bivalvia. The descriptions on the anatomy of S. occidentalis and of P. carpentieri are published elsewhere. The remaining are included here, for which a complete taxonomical treatment is performed. Beyond these species, representatives of other taxa are operationally included as part of the ingroup (indices are then shared with them, as a procedure to test the morphological monophyly of Diasoma. These taxa are: two lamellibranch bivalves [(8 Barbatia - Arcidae; (9 Serratina - Tellinidae; both published elsewhere;, and Propilidium (10 Patellogastropoda, and (11 Nautilus, basal Cephalopoda, based on basal taxa. The effective outgroups are (12 Neopilina (Monoplacophora and (13 Hanleya (Polyplacophora. The phylogenetic analysis based on morphology revealed that the taxon Diasoma is supported by 14 synapomorphies, and is separated from Cyrtosoma (Gastropoda + Cephalopoda. Although they are not the main goal of this paper, the taxa Scaphopoda and Bivalvia are supported by 8 and by 7 synapomorphies respectively. The taxon Protobranchia resulted paraphyletic. Both scaphopod orders resulted monophyletic. The obtained cladogram is: ((((Coccodentalium carduus - Paradentalium disparile (Polyschides noronhensis - Gadila brasiliensis ((Solemya occidentalis - S. notialis (Propeleda carpenteri (Ennucula puelcha (Barbatia cancellaria - Serratina capsoides (Propilidium curumim - Nautilus pompilius - Lolliguncula brevis.Este estudo analisa a morfologia e anatomia detalhadas de 4 espécies de Scaphopoda e 5 espécies de bivalves protobrânquios. Ambas as classes são tradicionalmente agrupadas no táxon Diasoma, o qual vem sendo questionado por diferentes metodologias, tais como molecular e de desenvolvimento. Este estudo é desenvolvido sob uma metodologia filogenética, a qual a maior preocupação é fornecer um procedimento inteligível e testável. As espécies de Scaphopoda analisadas provieram da costa brasileira e pertencem à família Dentaliidae [(1 Coccodentalium carduus; (2 Paradentalium disparile] e Gadilidae [(3 Polyschides noronhensis, n. sp. do Arquipélago de Fernando de Noronha; (4 Gadila braziliensis]. Estas espécies representam os ramos principais da classe Scaphopoda. Dos bivalves protobrânquios, representantes das famílias Solemyidae [(5 Solemya occidentalis, da Flórida; S. notialis, n. sp. do S.E. Brasil], Nuculanidae [(6 Propeleda carpentieri, da Flórida] e Nuculidae [(7 Ennucula puelcha, do sul do Brasil] são incluídos. Estas espécies representam os principais ramos dos bivalves basais. As descrições anatômicas de S. occidentalis e de P. carpentieri estão sendo publicadas em outro artigo, as das demais espécies estão incluídas neste, o qual também inclui um completo tratamento taxonômico. Além dessas espécies, representantes de outros táxons são operacionalmente incluídos como parte do ingroup (então os índices são compartilhados com eles, um procedimento visando testar a monofilia morfológica de Diasoma. Esses táx

  2. Comparative morphology among representatives of main taxa of Scaphopoda and basal protobranch Bivalvia (Mollusca)

    Scientific Electronic Library Online (English)

    Luiz Ricardo L., Simone.

    Full Text Available Este estudo analisa a morfologia e anatomia detalhadas de 4 espécies de Scaphopoda e 5 espécies de bivalves protobrânquios. Ambas as classes são tradicionalmente agrupadas no táxon Diasoma, o qual vem sendo questionado por diferentes metodologias, tais como molecular e de desenvolvimento. Este estud [...] o é desenvolvido sob uma metodologia filogenética, a qual a maior preocupação é fornecer um procedimento inteligível e testável. As espécies de Scaphopoda analisadas provieram da costa brasileira e pertencem à família Dentaliidae [(1) Coccodentalium carduus; (2) Paradentalium disparile] e Gadilidae [(3) Polyschides noronhensis, n. sp. do Arquipélago de Fernando de Noronha; (4) Gadila braziliensis]. Estas espécies representam os ramos principais da classe Scaphopoda. Dos bivalves protobrânquios, representantes das famílias Solemyidae [(5) Solemya occidentalis, da Flórida; S. notialis, n. sp. do S.E. Brasil], Nuculanidae [(6) Propeleda carpentieri, da Flórida] e Nuculidae [(7) Ennucula puelcha, do sul do Brasil] são incluídos. Estas espécies representam os principais ramos dos bivalves basais. As descrições anatômicas de S. occidentalis e de P. carpentieri estão sendo publicadas em outro artigo, as das demais espécies estão incluídas neste, o qual também inclui um completo tratamento taxonômico. Além dessas espécies, representantes de outros táxons são operacionalmente incluídos como parte do ingroup (então os índices são compartilhados com eles), um procedimento visando testar a monofilia morfológica de Diasoma. Esses táxons são 2 bivalves lamelibrânquios [(8) Barbatia - Arcidae; (9) Serratina - Tellinidae; ambos publicados em artigos a parte]; Propilidium (10) Patellogastropoda e (11) Nautilus, Cephalopoda basal, baseados em táxons basais. Os outgroups efetivos são (12) Neopilina (Monoplacophora) e (13) Hanleya (Polyplacophora). A análise filogenética baseada na morfologia revelou que o táxon Diasoma é suportado por 14 sinapomorfias, sendo separada de Cyrtosoma (Gastropoda + Cephalopoda). Embora não sendo o principal enfoque do presente artigo, os táxons Scaphopoda e Bivalvia são suportados por 8 e por 7 sinapomorfias respectivamente. O táxon Protobranchia resultou parafilético. O cladograma obtido é: ((((Coccodentalium carduus - Paradentalium disparile) (Polyschides noronhensis - Gadila brasiliensis)) ((Solemya occidentalis - S. notialis) (Propeleda carpenteri (Ennucula puelcha (Barbatia cancellaria - Serratina capsoides))))) (Propilidium curumim - Nautilus pompilius - Lolliguncula brevis)). Abstract in english This study deals with detailed morphology and anatomy of 4 species of Scaphopoda and 5 species of protobranch Bivalvia. Both classes are traditionally grouped in the taxon Diasoma, which has been questioned by different methodologies, such as molecular and developmental. This study is developed unde [...] r a phylogenetic methodology with the main concern in performing it in an intelligible and testable methodology. The analyzed Scaphopoda species came from the Brazilian coast and belong to the family Dentaliidae [(1) Coccodentalium carduus; (2) Paradentalium disparile] and Gadiliidae; [(3) Polyschides noronhensis, n. sp. from Fernando de Noronha Archipelago; (4) Gadila braziliensis]. These species represent the main branches of the class Scaphopoda. From protobranch bivalves, representatives of the families Solemyidae [(5) Solemya occidentalis, from Florida; S. notialis, n. sp. from S.E. Brazil], Nuculanidae [(6) Propeleda carpentieri from Florida], and Nuculidae [(7) Ennucula puelcha, from south Brazil] are included. These species represent the main branches of the basal Bivalvia. The descriptions on the anatomy of S. occidentalis and of P. carpentieri are published elsewhere. The remaining are included here, for which a complete taxonomical treatment is performed. Beyond these species, representatives of other taxa are operationally included as part of the ingroup (indices are then shared with them), as a procedure to test the morpho

  3. Korttermynbedreigings vir varswater-Mollusca in die Olifantsrivier en enkele sytakke Short-term threats for the sustained survival of freshwater Mollusca in the Olifants River and selected tributaries.

    Directory of Open Access Journals (Sweden)

    Kenné N. de Kock

    2013-02-01

    Full Text Available Die bewaringstatus van minder as 2% van die ongeveer 7000 molluskspesies bekend wêreldwyd, is tot dusver behoorlik geassesseer. Gevolglik is die algemene vlak van bedreiging vir molluske power gedokumenteer en hoogs waarskynlik onderskat. Varswatermolluske is permanente waterbewoners wat oor beperkte voortbewegingsvermoë beskik en aan ’n verskeidenheid van antropogeniese afvalstowwe blootgestel word omdat waterbronne dikwels as stortplek vir ’n groot verskeidenheid van nadelige besoedelstowwe gebruik word. Die Olifantsrivier word dikwels as een van die mees getransformeerde riviere in Suider-Afrika beskryf en word toenemend aan uitermate hoë druk onderwerp betreffende natuurlike hulpbronne en die geassosieerde landelike versteurings, asook besoedeling. Omdat min inligting oor die diversiteit van Mollusca in die Olifantsrivier op rekord is, is in die huidige studie vier opnames tydens twee opeenvolgende jare gemaak van die molluske in die Olifantsrivier en geselekteerde sytakke by onderskeidelik drie lokaliteite op die Hoëveld en vier in die Laeveld. Die pH en elektriese geleidingsvermoë van die water is by elk van die lokaliteite bepaal en het gewissel tussen 6.93 en 9.50, en 110 µS en 1336 µS, vir pH en geleidingsvermoë onderskeidelik. ’n Totaal van 25 molluskspesies is tydens die vier opnames versamel wat die eksotiese indringerspesies Lymnaea columella, Physa acuta, Aplexa marmorata en Tarebia granifera insluit. Laasgenoemde spesie het verreweg die grootste getal eksemplare in totaal opgelewer, hoofsaaklik by ’n lokaliteit wat as grootliks getransformeerd beskryf kan word. Die resultate van hierdie ondersoek kan as basis vir toekomstige opnames dien om die impak van antropogeniese versteurings op die diversiteit van die Mollusca in die Olifantsrivier- en opvanggebied te evalueer.The conservation status of less than 2% of the more or less 7000 mollusk species known worldwide have been properly assessed. Consequently the general level of imperilment is poorly documented and almost certainly underestimated. Freshwater mollusks live permanently in water, have limited means of movement and are exposed to a variety of anthropogenic waste products due to the fact that waterbodies often act as sinks for a large array of harmful pollutants. The Olifants River is often described as one of the most polluted rivers in Southern Africa and is progressively subjected to extremely high pressure with regard to natural resources and associated rural transformation and pollution. Little is on record regarding the diversity of the Mollusca in the Olifants River; therefore, in the present study, four surveys of the molluscs were conducted in this river and selected tributaries during two consecutive years at three localities situated on the Highveld and four localities situated in the Lowveld respectively. The pH and electric conductivity of the water were determined during each survey at each one of the localities and values ranged from 6.93 to 9.50, and 110 µS to 1336 µS, for pH and conductivity respectively. A total of 25 mollusk species were collected during the four surveys which included the exotic invader species Lymnaea columella, Physa acuta, Aplexa marmorata and Tarebia granifera. The latter species yielded the highest number of specimens by far, mainly at a locality which could be described as largely transformed. The results of this investigation can serve as a point of departure for future surveys to evaluate the impact of anthropogenic disturbances on the mollusc diversity in the Olifants River and catchment.

  4. Biodiversidad de gasterópodos terrestres (Mollusca) en el Parque Biológico Sierra de San Javier, Tucumán, Argentina

    Scientific Electronic Library Online (English)

    María José, Miranda; María Gabriela, Cuezzo.

    1009-10-01

    Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish Se realizó un inventario y se analizaron parámetros de diversidad de la malacofauna terrestre del Parque Biológico Sierra de San Javier. Se llevaron a cabo muestreos cualitativos y cuantitativos en parcelas de 10x10m tomadas en transectas altitudinales, para un total de 22 169 especímenes recolectad [...] os. Las identificaciones taxonómicas se llevaron a cabo a nivel de especie. Se construyó una matriz de especies por parcela para analizar patrones de diversidad y se utilizaron estimadores no paramétricos (ICE, ACE, Chao 1 y Chao 2) para calcular la diversidad del Parque, el grado de completitud del muestreo y la agregación espacial de los datos. Se calcularon los índices de Shannon, Simpson, Whittaker y Jaccard. La riqueza del Parque fue estimada en 32 especies distribuidas en 21 géneros y 13 familias. Solo una especie pertenece a Caenogastropoda, el resto son Pulmonados Stylommatophora y Systellommatophora. La familia más representada fue Charopidae mientras que la especie con mayor abundancia relativa fue Adelopoma tucma. La riqueza y diversidad fue levemente mayor en chaco seco que en bosque húmedo de Yungas. Los valores de diversidad obtenidos fueron elevados en comparación con estudios previos realizados en el noroeste Argentino. Abstract in english Biodiversity of land gastropods (Mollusca) in Sierra de San Javier Park, Tucumán, Argentina. Studies related to land mollusk diversity in tropical and subtropical forests are scarce. To assess this, a study on land snail diversity of subtropical cloudforest (Yungas) and dry forest (Chaco) areas of S [...] ierra de San Javier Park, Tucumán, Argentina, was carried out. Taxonomic identifications were performed to species level and built a species per stations data matrix to analyze diversity patterns on qualitative and quantitative samples processed from 10x10m quadrates in altitudinal transects. Non parametric analysis (ICE, ACE, Chao 1 and Chao 2) were used to estimate the true diversity of the area, as well as the degree of undersampling and spatial aggregation of the data. Diversity was also calculated using Shannon, Simpson, Whittaker and Jaccard indices. The richness of the San Javier Park was estimated to be 32 species distributed into 13 families and 21 genera. From the total number of species collected, a single one belongs to Caenogastropoda, while the rest of the species are classified into Pulmonata Stylommatophora and Systellommatophora. The most representative family was the micromollusc Charopidae, while the most relatively abundant species was another micromollusc snail, Adelopoma tucma. Richness and diversity were slightly more elevated in dry forest areas of the Chacoan Ecoregion than in cloud forest areas of Yungas. Non parametric estimators showed that the inventory was complete. Diversity values obtained were high in comparison to previously studied areas of Northwestern Argentina. The total number of specimen collected (22 169 specimens), was higher than other published studies. Rev. Biol. Trop. 58 (3): 1009- 1029. Epub 2010 September 01.

  5. Biodiversidad de gasterópodos terrestres (Mollusca en el Parque Biológico Sierra de San Javier, Tucumán, Argentina

    Directory of Open Access Journals (Sweden)

    María José Miranda

    2010-09-01

    Full Text Available Se realizó un inventario y se analizaron parámetros de diversidad de la malacofauna terrestre del Parque Biológico Sierra de San Javier. Se llevaron a cabo muestreos cualitativos y cuantitativos en parcelas de 10x10m tomadas en transectas altitudinales, para un total de 22 169 especímenes recolectados. Las identificaciones taxonómicas se llevaron a cabo a nivel de especie. Se construyó una matriz de especies por parcela para analizar patrones de diversidad y se utilizaron estimadores no paramétricos (ICE, ACE, Chao 1 y Chao 2 para calcular la diversidad del Parque, el grado de completitud del muestreo y la agregación espacial de los datos. Se calcularon los índices de Shannon, Simpson, Whittaker y Jaccard. La riqueza del Parque fue estimada en 32 especies distribuidas en 21 géneros y 13 familias. Solo una especie pertenece a Caenogastropoda, el resto son Pulmonados Stylommatophora y Systellommatophora. La familia más representada fue Charopidae mientras que la especie con mayor abundancia relativa fue Adelopoma tucma. La riqueza y diversidad fue levemente mayor en chaco seco que en bosque húmedo de Yungas. Los valores de diversidad obtenidos fueron elevados en comparación con estudios previos realizados en el noroeste Argentino.Biodiversity of land gastropods (Mollusca in Sierra de San Javier Park, Tucumán, Argentina. Studies related to land mollusk diversity in tropical and subtropical forests are scarce. To assess this, a study on land snail diversity of subtropical cloudforest (Yungas and dry forest (Chaco areas of Sierra de San Javier Park, Tucumán, Argentina, was carried out. Taxonomic identifications were performed to species level and built a species per stations data matrix to analyze diversity patterns on qualitative and quantitative samples processed from 10x10m quadrates in altitudinal transects. Non parametric analysis (ICE, ACE, Chao 1 and Chao 2 were used to estimate the true diversity of the area, as well as the degree of undersampling and spatial aggregation of the data. Diversity was also calculated using Shannon, Simpson, Whittaker and Jaccard indices. The richness of the San Javier Park was estimated to be 32 species distributed into 13 families and 21 genera. From the total number of species collected, a single one belongs to Caenogastropoda, while the rest of the species are classified into Pulmonata Stylommatophora and Systellommatophora. The most representative family was the micromollusc Charopidae, while the most relatively abundant species was another micromollusc snail, Adelopoma tucma. Richness and diversity were slightly more elevated in dry forest areas of the Chacoan Ecoregion than in cloud forest areas of Yungas. Non parametric estimators showed that the inventory was complete. Diversity values obtained were high in comparison to previously studied areas of Northwestern Argentina. The total number of specimen collected (22 169 specimens, was higher than other published studies. Rev. Biol. Trop. 58 (3: 1009- 1029. Epub 2010 September 01.

  6. The influence of fish cage culture on ?13C and ?15N of filter-feeding Bivalvia (Mollusca) / A influência dos tanques rede sobre o ?13C e ?15N de uma espécie filtradora Bivalvia (Mollusca)

    Scientific Electronic Library Online (English)

    E., Benedito; L., Figueroa; A.M, Takeda; GI., Manetta.

    2013-11-01

    Full Text Available SciELO Brazil | Language: English Abstract in portuguese O objetivo deste estudo foi avaliar o efeito do cultivo de Oreochromis niloticus em tanques rede sobre os valores de ?13C e ?15N em tecidos Corbicula fluminea (Mollusca; Bivalvia) e no sedimento da cadeia alimentar aquática. As amostragens foram realizadas em períodos prévios e posteriores a instala [...] ção de tanques redes no reservatório de Rosana (Rio Paranapanema, PR-SP). As amostras de espécimes de bivalves filtradores exóticos e as de sedimento foram coletadas utilizando uma versão modificada do pegador tipo Petersen. Todas as amostras foram secas em estufa (60 °C) durante 72 horas, maceradas até obtenção de pó fino e homogêneo e enviadas para determinação do carbono (13C) e do nitrogênio (15N) em espectrofotômetro de massa. Houve diferenças significativas nos valores ?13C e ?15N do invertebrado C. fluminea entre o início e o fim do experimento. Entretanto, não foram evidenciadas diferenças nos valores ?13C e ?15N presente no sedimento. Estes resultados demonstram que a instalação dos tanques rede promoveram impactos na composição isotópica do invertebrado, que podem influenciar as espécies nativas e o ecossistema. Abstract in english The objective of this study was to evaluate the effect of Oreochromis niloticus cage culture promoted variations in the ?13C and ?15N in Corbicula fluminea (Mollusca; Bivalvia) and in the sediment of an aquatic food web. Samples were taken before and after net cage installation in the Rosana Reservo [...] ir (Paranapanema River, PR-SP). Samples of specimens of the bivalve filterer C. fluminea and samples of sediment were collected using a modified Petersen grab. All samples were dried in an oven (60 °C) for 72 hours, macerated to obtain homogenous fine powders and sent for carbon (?13C) and nitrogen (?15N) isotopic value analysis in a mass spectrometer. There were significant differences in the ?13C and ?15N values of the invertebrate C. fluminea between the beginning and the end of the experiment. There were no differences between the ?13C and ?15N values of sediment. These results indicate that the installation of fish cage culture promoted impacts in the isotopic composition of the aquatic food web organisms, which could exert influence over the native species and the ecosystem.

  7. Estado de conocimiento de los Gastrópodos dulceacuícolas de Chile Current state of knowledge of the freshwater Gastropoda of Chile

    Directory of Open Access Journals (Sweden)

    Claudio Valdovinos Zarges

    2006-06-01

    Full Text Available De acuerdo a la literatura, los gastrópodos dulceacuícolas chilenos están compuestos por 73 especies, i.e., 30 spp. de Chilinidae (género Chilina Gray 1828, 4 spp. de Physidae (género Physa Draparnaud 1801, 5 spp. de Lymnaeidae (género Lymnaea Lamarck 1799, 7 spp. de Planorbidae (género Biomphalaria Preston 1910, 5 spp. de Ancylidae (género Anisancylus Pilsbry 1924 y Uncancylus Pilsbry 1913, y 22 spp. de Hydrobiidae (género Potamolithus Pilsbry 1896 y Littoridina Souleyet 1852. La distribución del conjunto de especies de gastrópodos se extiende desde Arica en el norte hasta Magallanes en el sur. Sin embargo, la mayor parte de las especies tiene su rango geográfico restringido a una o unas pocas cuencas hidrográficas contiguas a lo largo del gradiente latitudinal. La mayor concentración de especies de gastrópodos se localiza entre las regiones administrativas VII y X. Actualmente existe una importante falta de conocimiento en relación a la taxonomía, biología, ecología, biogeografía y estado de conservación de prácticamente todas las especies de gastrópodos dulceacuícolas chilenos.According to literature, the Chilean freshwater gastropoda is currently composed by 73 species, i.e., 30 spp. of Chilinidae (genus Chilina Gray 1828, 4 spp. of Physidae (genus Physa Draparnaud 1801, 5 spp. of Lymnaeidae (genus Lymnaea Lamarck 1799, 7 spp. of Planorbidae (genus Biomphalaria Preston 1910, 5 spp. of Ancylidae (genus Anisancylus Pilsbry 1924 and Uncancylus Pilsbry 1913, and 22 spp. of Hydrobiidae (genus Potamolithus Pilsbry 1896 and Littoridina Souleyet 1852. The distribution of the set of species of gastropods spans from Arica in the north to Magallanes in the far south. However, most species have a restricted geographic range, comprising one or a few hydrographical contiguous basins along the latitudinal gradient. The largest concentration of gastropods species is found between the VII and X administrative Regions. An important lack of knowledge exist in relation to the taxonomy, biology, ecology, biogeography and conservation state of practically all the species of Chilean freshwater gastropods.

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

    Science.gov (United States)

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

    2007-11-01

    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.

  9. The influence of fish cage culture on ?13C and ?15N of filter-feeding Bivalvia (Mollusca)

    International Nuclear Information System (INIS)

    The objective of this study was to evaluate the effect of Oreochromis niloticus cage culture promoted variations in the ?13C and ?15N in Corbicula fluminea (Mollusca; Bivalvia) and in the sediment of an aquatic food web. Samples were taken before and after net cage installation in the Rosana Reservoir (Paranapanema River, PR-SP). Samples of specimens of the bivalve filter C. fluminea and samples of sediment were collected using a modified Petersen grab. All samples were dried in an oven (60 °C) for 72 hours, macerated to obtain homogenous fine powders and sent for carbon (?13C) and nitrogen (?15N) isotopic value analysis in a mass spectrometer. There were significant differences in the ?13C and ?15N values of the invertebrate C. fluminea between the beginning and the end of the experiment. There were no differences between the ?13C and ?15N values of sediment. These results indicate that the installation of fish cage culture promoted impacts in the isotopic composition of the aquatic food web organisms, which could exert influence over the native species and the ecosystem. (author)

  10. The influence of fish cage culture on ?{sup 13}C and ?{sup 15}N of filter-feeding Bivalvia (Mollusca)

    Energy Technology Data Exchange (ETDEWEB)

    Benedito, E.; Takeda, A.M., E-mail: eva@nupelia.uem.br [Universidade Estadual de Maringa (UEM), PR (Brazil). Nucleo de Pesquisas em Limnologia, Ictiologia e Aquicultura; Figueroa, L. [Universidade Estadual de Maringa (UEM), PR (Brazil). Pos-Graduacao em Ecologia de Ambientes Aquaticos Continentais; Manetta, GI. [Universidade Estadual de Maringa (UEM), PR (Brazil). Pos-Graduacao em Biologia Comparada

    2013-11-15

    The objective of this study was to evaluate the effect of Oreochromis niloticus cage culture promoted variations in the ?{sup 13}C and ?{sup 15}N in Corbicula fluminea (Mollusca; Bivalvia) and in the sediment of an aquatic food web. Samples were taken before and after net cage installation in the Rosana Reservoir (Paranapanema River, PR-SP). Samples of specimens of the bivalve filter C. fluminea and samples of sediment were collected using a modified Petersen grab. All samples were dried in an oven (60 °C) for 72 hours, macerated to obtain homogenous fine powders and sent for carbon (?{sup 13}C) and nitrogen (?{sup 15}N) isotopic value analysis in a mass spectrometer. There were significant differences in the ?{sup 13}C and ?{sup 15}N values of the invertebrate C. fluminea between the beginning and the end of the experiment. There were no differences between the ?{sup 13}C and ?{sup 15}N values of sediment. These results indicate that the installation of fish cage culture promoted impacts in the isotopic composition of the aquatic food web organisms, which could exert influence over the native species and the ecosystem. (author)

  11. Molecular phylogenetic analysis supports a Gondwanan origin of the Hyriidae (Mollusca: Bivalvia: Unionida) and the paraphyly of Australasian taxa.

    Science.gov (United States)

    Graf, Daniel L; Jones, Hugh; Geneva, Anthony J; Pfeiffer, John M; Klunzinger, Michael W

    2015-04-01

    The freshwater mussel family Hyriidae (Mollusca: Bivalvia: Unionida) has a disjunct trans-Pacific distribution in Australasia and South America. Previous phylogenetic analyses have estimated the evolutionary relationships of the family and the major infra-familial taxa (Velesunioninae and Hyriinae: Hyridellini in Australia; Hyriinae: Hyriini, Castaliini, and Rhipidodontini in South America), but taxon and character sampling have been too incomplete to support a predictive classification or allow testing of biogeographical hypotheses. We sampled 30 freshwater mussel individuals representing the aforementioned hyriid taxa, as well as outgroup species representing the five other freshwater mussel families and their marine sister group (order Trigoniida). Our ingroup included representatives of all Australian genera. Phylogenetic relationships were estimated from three gene fragments (nuclear 28S, COI and 16S mtDNA) using maximum parsimony, maximum likelihood, and Bayesian inference, and we applied a Bayesian relaxed clock model calibrated with fossil dates to estimate node ages. Our analyses found good support for monophyly of the Hyriidae and the subfamilies and tribes, as well as the paraphyly of the Australasian taxa (Velesunioninae, (Hyridellini, (Rhipidodontini, (Castaliini, Hyriini)))). The Hyriidae was recovered as sister to a clade comprised of all other Recent freshwater mussel families. Our molecular date estimation supported Cretaceous origins of the major hyriid clades, pre-dating the Tertiary isolation of South America from Antarctica/Australia. We hypothesize that early diversification of the Hyriidae was driven by terrestrial barriers on Gondwana rather than marine barriers following disintegration of the super-continent. PMID:25659337

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

    Scientific Electronic Library Online (English)

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

    2009-06-01

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

  13. Tanatocenózy m?kkýš? v archeologických objektech knovízské kultury v Kn?ževsi u Prahy.

    Czech Academy of Sciences Publication Activity Database

    Hlavá?, Jaroslav

    Vol. 1. Praha : Ústav archeologické památkové pé?e st?edních ?ech, 2011 - (Smejtek, L.), s. 449-463 ISBN 978-80-86756-15-8 R&D Projects: GA AV ?R IAAX00020701 Institutional research plan: CEZ:AV0Z3013912 Keywords : Mollusca * Gastropoda * Bivalvia * thanatocoenoses * palaeoenvironmental reconstruction Subject RIV: DB - Geology ; Mineralogy

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

    Scientific Electronic Library Online (English)

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

    1069-10-01

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

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

    Directory of Open Access Journals (Sweden)

    Juan Felipe Blanco-Libreros

    2009-12-01

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

  16. A new species of Acteon (Opisthobranchia: Acteonidae from Northeast Brazil

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    Carlo Magenta Cunha

    2011-04-01

    Full Text Available A new species of Acteon Montfort 1810, Acteon mirim sp. nov., from Canopus Bank, state of Ceará, Brazil is described based on shell morphology. The new species is compared with other species of the genus reported from Brazil. It differs from other Brazilian species in having a whitish color with dark orange-brown spiral bands and a shell surface covered with small spiral grooves, regularly rectangular.

  17. A preliminary study of iron isotope fractionation in marine invertebrates (chitons, Mollusca) in near-shore environments

    Science.gov (United States)

    Emmanuel, S.; Schuessler, J. A.; Vinther, J.; Matthews, A.; von Blanckenburg, F.

    2014-10-01

    Chitons (Mollusca) are marine invertebrates that produce radulae (teeth or rasping tongues) containing high concentrations of biomineralized magnetite and other iron-bearing minerals. As Fe isotope signatures are influenced by redox processes and biological fractionation, Fe isotopes in chiton radulae might be expected to provide an effective tracer of ambient oceanic conditions and biogeochemical cycling. Here, in a pilot study to measure Fe isotopes in marine invertebrates, we examine Fe isotopes in modern marine chiton radulae collected from different locations in the Atlantic and Pacific oceans to assess the range of isotopic values, and to test whether or not the isotopic signatures reflect seawater values. Values of ?56Fe (relative to IRMM-014) in chiton teeth range from -1.90 to 0.00 ‰ (±0.05‰ (2?) uncertainty in ?56Fe), probably reflecting a combination of geographical control and biological fractionation processes. Comparison with published local surface seawater Fe isotope data shows a consistent negative offset of chiton teeth Fe isotope compositions relative to seawater. Strikingly, two different species from the same locality in the North Pacific (Puget Sound, Washington, USA) have distinct isotopic signatures. Tonicella lineata, which feeds on red algae in the sublittoral zone, has a mean ?56Fe of -0.65 ± 0.26‰ (2?, 3 specimens), while Mopalia muscosa, which feeds on both green and red algae in the eulittoral zone, shows lighter isotopic values with a mean ?56Fe of -1.47 ± 0.98‰ (2?, 5 specimens). Three possible pathways are proposed to account for the different isotopic signatures: (i) physiologically controlled processes within the chitons that lead to species-dependent fractionation; (ii) diet-controlled variability due to different Fe isotope fractionation in the red and green algal food sources; and (iii) environmentally controlled fractionation that causes variation in the isotopic signatures of bioavailable Fe in the different tidal regions. Our preliminary results suggest that while chitons are not simple recorders of the ambient seawater Fe isotopic signature, Fe isotopes provide valuable information concerning Fe biogeochemical cycling in near-shore environments, and may potentially be used to probe sources of Fe recorded in different organisms.

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

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    Rivera–Ingraham, G. A.

    2011-12-01

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

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

    Directory of Open Access Journals (Sweden)

    Oscar RAVERA

    2005-08-01

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

  20. Effects of CO-60 gamma radiation on the embryonary development of Biomphalaria Glabrata (Say, 1818)

    International Nuclear Information System (INIS)

    Some aspects of the effects of the ionizing radiation on the embryo and on the genetical material of Biomphalaria glabrata (Mollusca: Gastropoda) are presented. The embryos weresubmitted at various stages of development to doses of 5,10,15,20 and 25 Gy of Co-60 gamma radiation. As a criteia of evaluation of the embryos radiosensitivity, four biological parameters were used: mortality, malformation, hatching and chromossomal aberrations. (M.A.C.)

  1. Comparative ORESTES-sampling of transcriptomes of immune-challenged Biomphalaria glabrata snails

    OpenAIRE

    Hanelt, Ben; Lun, Cheng Man; Adema, Coen M.

    2008-01-01

    The snail Biomphalaria glabrata (Gastropoda, Mollusca) is an important intermediate host for the human parasite Schistosoma mansoni (Digenea, Trematoda). Anti-pathogen responses of B. glabrata were studied towards a better understanding of snail immunity and host-parasite compatibility. Open reading frame ESTs (ORESTES) were sampled from different transcriptomes of M line strain B. glabrata, 12 hours post challenge with Escherichia coli (Gram-negative), Micrococcus luteus (Gram-positive) bact...

  2. Sucesión temprana de la taxocenosis Mollusca-Annelida-Crustacea en raíces sumergidas de mangle rojo en San Andrés Isla, Caribe colombiano / Early succession of the taxocenosis Mollusca-Annelida-Crustacea on red mangrove submerged roots in San Andres Island, Colombian Caribbean

    Scientific Electronic Library Online (English)

    Patricia E, Romero-Murillo; Jaime, Polanía.

    2008-04-01

    Full Text Available SciELO Chile | Language: Spanish Abstract in spanish Se analizó la sucesión temprana de los taxa Annelida, Mollusca y Crustacea asociados a las raíces sumergidas de Rhizophora mangle (mangle rojo), empleando ramas del mismo como sustrato artificial (unidades experimentales). El análisis se relacionó con algunas variables físico-químicas y ambientales [...] durante 188 días en San Andrés Isla, entre noviembre 2002 y mayo 2003, en tres estaciones de dos bahías, Hooker y Honda. Se identificaron 34.175 individuos en 130 unidades experimentales, los anélidos mostraron la mayor proporción (77,1%). Se generó un análisis de ordenación y clasificación (dendrograma y un escalamiento multidimensional no métrico-NMDS) para cada uno de los tres taxa estudiados. Los análisis revelaron débil similaridad entre la parte interna de Bahía Hooker y las estaciones restantes. Se calcularon los índices de diversidad de Shannon-Wiener, uniformidad de Pielou, riqueza de Margalef y predominio de Simpson a lo largo del estudio; los tres primeros presentaron mayores valores en Bahía Hooker que en Honda, mientras que el índice de predominio fue mayor en Bahía Honda. Hubo organismos pioneros como el anélido Spirorbis sp. y transitorios como los crustáceos; los moluscos parecieron necesitar periodos más prolongados para asentarse. Estas respuestas revelan que características geomorfológicas, presencia o ausencia de corrientes de agua dulce, mareas y lluvias, principalmente, y factores antrópicos pueden influir en el desarrollo de estas comunidades. Dispersión larval y proximidad con otros ecosistemas aumentan o disminuyen las poblaciones; sólo algunos organismos adaptados a condiciones extremas se establecen y mantienen en el área. Bajo condiciones favorables, la abundancia y diversidad de especies tienden a aumentar Abstract in english The early succession of the taxa Annelida, Mollusca and Crustacea on Rhizophora mangle (red mangrove) submerged roots was analyzed using old branches as ground (which were the experimental units) in San Andres Island. The analysis was related to some physico-chemical and environmental variables duri [...] ng 188 days, between November/2002 and May/2003, in Hooker and Honda bays. A total of 34,175 individuals in 130 experimental units were counted, where the annelids represented the largest proportion (77.1%) from the whole sample. A dendrogram and a nonmetric multidimensional scaling (NMDS) were constructed for each one of the three studied taxa. The analyses showed a weak similarity between the internal part of the Hooker Bay and the remaining stations. Shannon-Wiener diversity, Pielou evenness, Margalef richness and Simpson predominance indexes were calculated throughout the study; the three first indices showed greater values in Hooker Bay than in Honda Bay, while the predominance index was greater in Bay Honda. There were pioneers organisms such as Spirorbis sp., and transient ones, such as crustaceans, whilst molluscs seemed to need longer periods to settle in. These responses reveal that geomorphological characteristics, presence or absence of freshwater currents, tides and rainfall mainly, as well as anthropic factors can influence the development of these communities. Larval dispersion and the proximity to other ecosystems increase or reduce the populations, and only some organisms, adapted to extreme conditions, settle down and maintain in the area. Under favorable conditions, abundance and species diversity tend to increase

  3. Elementos traza detectados por plasma inductivamente acoplado (ICP) en pepitonas, Arca zebra (Mollusca, Arcidae) de dos localidades costeras del estado Sucre, Venezuela / Trace elements detected by Inductively Coupled Plasma (ICP) in Turkey wing, Arca zebra (Mollusca, Arcidae) from two coastal locations of Sucre State, Venezuela

    Scientific Electronic Library Online (English)

    Vilma, Lanza; Ildemaro, Martínez; Osmicar, Vallenilla; Julia, Márquez; Arquímedes, González; Jesús, Gamboa; José, Alió.

    2011-09-01

    Full Text Available Los metales pesados juegan un papel importante en la dinámica de los procesos químicos y ambientales en las zonas costeras. Estos provienen de aportes naturales y antropogénicos y pueden ser bioacumulados en organismos acuáticos, en los que se encuentran como elementos traza, y tienen potenciales ef [...] ectos tóxicos a quienes los consuman, principalmente al hombre como último eslabón de la cadena alimenticia. La gravedad del daño depende del grado y el tiempo de exposición a dichos elementos. Se determinó la concentración de metales pesados (Mg, Cu, Mn, Mo, Ni y Fe) por Plasma Inductivamente Acoplado (ICP) en la pepitona, Arca zebra (Mollusca, Bivalvia, Arcidae), provenientes de las inmediaciones de Caimancito y Chacopata (municipio Cruz Salmerón Acosta, estado Sucre, Venezuela). En Caimancito, las mayores concentraciones de casi todos los metales se detectaron en septiembre, a excepción del Mg que fue observada en febrero. En Chacopata, las concentraciones más elevadas se observaron en el mes de octubre (Mg, Mn y Ni), septiembre (Cu), diciembre (Fe) y en enero (Mo). No se encontraron diferencias significativas entre las localidades, mientras que existen diferencias significativas entre meses. Al momento no existen normas o regulaciones venezolanas que establezcan límites máximos de concentración de los metales analizados en moluscos bivalvos procesados o frescos, que permitan establecer comparaciones con los resultados obtenidos. Sin embargo, en base a normas internacionales, las concentraciones medidas de metales pesados en pepitonas no rebasaron los límites permitidos para consumo humano. Abstract in english Heavy metals play an important role in the dynamics of chemical and environmental processes in the coastal zones. They originate from natural and anthropogenic sources and can be bioaccumulated in aquatic organisms, where they are found as trace elements, and have potential toxic effects to those wh [...] o consume them, mainly to humans as the last link in the food chain. The severity of damage depends on the degree and time of exposure to these elements. The concentration of heavy metals (Mg, Cu, Mn, Mo, Ni and Fe) was estimated by Inductivelly Coupled Plasma (ICP) in the Turkey wing, Arca zebra (Mollusca, Bivalvia, Arcidae), from the vicinity to Caimancito and Chacopata (Municipality Cruz Salmerón Acosta, Sucre state, Venezuela). In Caimancito, higher concentrations of almost all metals were detected in September, except for Mg which was registered in February. In Chacopata, the highest concentrations were observed in October (Mg, Mn and Ni), September (Cu), December (Fe) and January (Mo). No significant differences were found between localities, while there were significant differences among months. At present there are not Venezuelan norms or regulations establishing the maximum concentration limits for the analyzed heavy metals in fresh or processed bivalve mollusks, which may enable comparisons with the obtained results. However, based upon international norms, the measured concentrations of heavy metals in Turkey wing apparently do not represent a threat for human consumption.

  4. Variabilidad temporal de la abundancia de Coralliophila abbreviata y Coralliophila caribaea (Mollusca, Coralliophilidae) en un arrecife coralino del Parque Nacional Morrocoy, Venezuela

    Scientific Electronic Library Online (English)

    Carlos, del Mónaco; Estrella, Villamizar; Samuel, Narciso.

    2008-06-01

    Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish C. abbreviata y C. caribaea son moluscos coralívoros del Mar Caribe. Evaluamos la variabilidad temporal de la abundancia y los cambios en la estructura de talla de C. abbreviata y C. caribaea en Cayo Sombrero, Venezuela (septiembre 2004-agosto 2005). Se colocaron transectas fijas de 50 metros de lon [...] gitud a profundidades de tres y seis metros cada una, paralelas a la costa. Se evaluó mensualmente durante un año la densidad de ambos depredadores y se seleccionaron 30 individuos de C. abbreviata para medirlos cada mes. Las densidades de C. abbreviata en la transecta somera fluctuaron entre 1.78 ind/m² en septiembre y 6.26 ind/m² en mayo; las densidades de C. abbreviata en la transecta profunda estuvieron comprendidas entre 4.23 ind/m² en enero y 7.66 ind/m² en mayo. Las densidades de C. caribaea fluctuaron en la transecta somera entre 0 ind/m² (todos los meses menos septiembre) y 0.03 ind/m² (septiembre) mientras que la transecta profunda fluctuó entre 0 ind/m² (octubre a marzo y julio) y 0.1 ind/m² (abril). La mayoría de los individuos de C. abbreviata midieron entre 12 y 16 mm de longitud. El largo de la mayoría de los individuos de C. caribaea estuvo comprendido entre 10 y 15 mm. Abstract in english Temporary abundance variation of Coralliophila abbreviata and Coralliophila caribaea (Mollusca, Coralliophilidae) in a coral reef at Morrocoy National Park. The mollusks Coralliophila abbreviata and C. caribaea are coral predators in the Caribbean Sea . We evaluated the temporal variability of abund [...] ance and size structure of C. abbreviata and C. caribaea in Cayo Sombrero, Morrocoy National Park, Venezuelar (September 2004 - August 2005). The density of C. abbreviata and C. caribaea was evaluated monthly by means of two 50- meter long transects paralell to the coast line, at 3 m and 6 m deep; aditionally, 30 individuals of C. abbreviata were collected to measure size. The densities of C. abbreviata at the shallow transect fluctuated between 1.78 ind/m² in September and 6.26 ind/m² in May. The densities at the deep transect fluctuated between 4.23 ind/m² in January and 7.66 ind/m² in May. The densities of C. caribaea at the shallow transect fluctuated between 0 ind/m2 (except in September) and 0.03 ind/m² (September) and the densities at the deep transect fluctuated between 0 ind/m² (October to March and July) and 0.1 ind/m² (April). Most individuals of C. abbreviata and C. caribaea measured between 12 and 16 mm and between 10 and 15 mm long respectively. Rev. Biol. Trop. 56 (2): 501-511. Epub 2008 June 30.

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

    Scientific Electronic Library Online (English)

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

    2012-02-01

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

  6. Macrofauna associated with galleries of Neoteredo reynei (Bartsch, 1920 (Mollusca: Bivalvia in Rhizophora mangle Linnaeus trunks during less rainy season in mangrove of São Caetano de Odivelas, Pará (North Coast of Brazil

    Directory of Open Access Journals (Sweden)

    Daiane Aviz

    2009-04-01

    Full Text Available This study aims to characterize the benthic macrofauna associated with galleries made by Neoteredo reynei in Rhizophora mangle mangroves of the river Mojuim estuary (São Caetano de Odivelas, Pará. Samples were taken during the less rainy period of 2004 (June, July and August at three sites in the intertidal zone. At every occasion a log of R. mangle in the initial stages of decomposition was removed from each area. During the biological sampling air temperature, pH, salinity and temperature of the water were recorded. Neoteredo reynei was the only Teredinidae (boring mussel species observed. The macrofauna was composed of 452 individuals, distributed over 31 taxa belonging to the phyla Nemertea (one tax, Mollusca (three taxa, Annelida (six taxa and Arthropoda (21 taxa. The recorded fauna was typically estuarine, whit the exception of some terrestrial groups. Abundance, richness, diversity and uniformity increased in the course of the dry season, probably reflecting the observed increase of water salinity. The high diversity of the macrofauna recorded in this study reinforces the importance of teredo galleries as a habitat for estuarine organisms and consequently for the functioning of the mangrove ecosystem.

  7. Perfil de lípidos y ácidos grasos de Perna viridis, mejillón verde (Mollusca: Bivalvia) en el oriente venezolano y la costa oeste de Trinidad

    Scientific Electronic Library Online (English)

    Tamar, Koftayan; Jahiro, Milano; Haydelba, D´Armas; Gabriel, Salazar.

    2011-03-01

    Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish Los lípidos totales fueron extraídos, identificados y cuantificados por gravimetría, mediante TLC/FID (sistema Iatroscan). Los ácidos grasos de los lípidos totales, fosfolípidos y triacilgliceroles fueron identificados y cuantificados por cromatografía de gases. Las mayores concentraciones de lípido [...] s totales se presentaron en las muestras de Los Cedros, La Brea y Chaguaramas con valores de 7.92, 7.74 y 7.53%; respectivamente y los valores mínimos en las de La Restinga (6.08%). En la composición lípidica, las muestras de Chacopata presentaron la menor concentración de fosfolípidos (48.86%) y los máximos valores de colesterol (38.87%) y triacilgliceroles (12.26%), y las muestras de La Esmeralda y Río Caribe exhibieron concentraciones máximas de fosfolípidos (88.71-84.93%, respectivamente) y mínimas de colesterol (6.50-4.42%). En los lípidos totales, los ácidos grasos saturados se encontraron entre 15.04 y 65.55%, con máximos en muestras de La Esmeralda y mínimos en Chacopata y los poliinsaturados estuvieron entre 7.80 y 37.18%, con máximos valores en la Brea y mínimos en la Esmeralda. En los fosfolípidos, la concentración de ácidos grasos saturados estuvo entre 38.81 y 48.68% para las muestras de Chaguaramas y Chacopata, respectivamente; los ácidos grasos poliinsaturados se encontraron entre no detectado y 34.51%, con altas concentraciones en muestras de Los Cedros (27.97%) y Chaguaramas (34.51%). En los triacilgliceroles, la composición de ácidos grasos saturados variaron entre 14.27 y 53.80%, con baja concentración en Chacopata y alta concentración en La Restinga; los ácidos grasos poliinsaturados estuvieron entre 4.66 y 35.55%, con valores menores en las muestras de Chacopata (4.66%) y mayores en Chaguaramas. El consumo frecuente de Perna viridis es recomendable, debido a su alto contenido de fosfolípidos y ácidos grasos insaturados. Abstract in english Lipid and fatty acid profile of Perna viridis, Green Mussel (Mollusca: Bivalvia) in different areas of the Eastern Venezuela and the West coast of Trinidad. The species Perna viridis is a highly consumed species, which fast growth makes it an interesting aquaculture alternative for Venezuelan and Tr [...] inidad coasts. With the aim to contribute with its nutritional value information, this study analyzed lipid and fatty acid contents from samples taken in five locations from Eastern Venezuela and three from Trinidad West Coast. Total lipids were extracted and quantified, from a pooled sample of 100 organisms per location, by standard gravimetric methods, and their identification and quantification was done by TLC/FID (Iatroscan system). Furthermore, the esterified fatty acids of total lipid, phospholipids and triacylglycerols were identified and quantified by gas chromatography. Eastern Venezuela samples from Los Cedros, La Brea and Chaguaramas showed the highest total lipid values of 7.92, 7.74 and 7.53, respectively, and the minimum values were obtained for La Restinga (6.08%). Among lipid composition, Chacopata samples showed the lowest phospholipid concentration (48.86%) and the maximum values for cholesterol (38.87%) and triacylglycerols (12.26%); besides, La Esmeralda and Rio Caribe samples exhibited maximum phospholipids (88.71 and 84.93 respectively) and minimum cholesterol (6.50 and 4.42%) concentrations. Saturated fatty acids represented between 15.04% and 65.55% within total lipid extracts, with maximum and minimum values for La Esmeralda and Chacopata, respectively. Polyunsaturated results resulted between 7.80 and 37.18%, with higher values in La Brea and lower values in La Esmeralda. For phospholipids, saturated fatty acids concentrations varied between 38.81 and 48.68% for Chaguaramas and Chacopata samples, respectively. In the case of polyunsaturated fatty acids, these varied between non detected and 34.51%, with high concentrations in Los Cedros (27.97%) and Chaguaramas (34.51%) samples. For the triacylglycerols, the saturated fatty ac

  8. Perfil de lípidos y ácidos grasos de Perna viridis, mejillón verde (Mollusca: Bivalvia en el oriente venezolano y la costa oeste de Trinidad

    Directory of Open Access Journals (Sweden)

    Tamar Koftayan

    2011-03-01

    Full Text Available Los lípidos totales fueron extraídos, identificados y cuantificados por gravimetría, mediante TLC/FID (sistema Iatroscan. Los ácidos grasos de los lípidos totales, fosfolípidos y triacilgliceroles fueron identificados y cuantificados por cromatografía de gases. Las mayores concentraciones de lípidos totales se presentaron en las muestras de Los Cedros, La Brea y Chaguaramas con valores de 7.92, 7.74 y 7.53%; respectivamente y los valores mínimos en las de La Restinga (6.08%. En la composición lípidica, las muestras de Chacopata presentaron la menor concentración de fosfolípidos (48.86% y los máximos valores de colesterol (38.87% y triacilgliceroles (12.26%, y las muestras de La Esmeralda y Río Caribe exhibieron concentraciones máximas de fosfolípidos (88.71-84.93%, respectivamente y mínimas de colesterol (6.50-4.42%. En los lípidos totales, los ácidos grasos saturados se encontraron entre 15.04 y 65.55%, con máximos en muestras de La Esmeralda y mínimos en Chacopata y los poliinsaturados estuvieron entre 7.80 y 37.18%, con máximos valores en la Brea y mínimos en la Esmeralda. En los fosfolípidos, la concentración de ácidos grasos saturados estuvo entre 38.81 y 48.68% para las muestras de Chaguaramas y Chacopata, respectivamente; los ácidos grasos poliinsaturados se encontraron entre no detectado y 34.51%, con altas concentraciones en muestras de Los Cedros (27.97% y Chaguaramas (34.51%. En los triacilgliceroles, la composición de ácidos grasos saturados variaron entre 14.27 y 53.80%, con baja concentración en Chacopata y alta concentración en La Restinga; los ácidos grasos poliinsaturados estuvieron entre 4.66 y 35.55%, con valores menores en las muestras de Chacopata (4.66% y mayores en Chaguaramas. El consumo frecuente de Perna viridis es recomendable, debido a su alto contenido de fosfolípidos y ácidos grasos insaturados.Lipid and fatty acid profile of Perna viridis, Green Mussel (Mollusca: Bivalvia in different areas of the Eastern Venezuela and the West coast of Trinidad. The species Perna viridis is a highly consumed species, which fast growth makes it an interesting aquaculture alternative for Venezuelan and Trinidad coasts. With the aim to contribute with its nutritional value information, this study analyzed lipid and fatty acid contents from samples taken in five locations from Eastern Venezuela and three from Trinidad West Coast. Total lipids were extracted and quantified, from a pooled sample of 100 organisms per location, by standard gravimetric methods, and their identification and quantification was done by TLC/FID (Iatroscan system. Furthermore, the esterified fatty acids of total lipid, phospholipids and triacylglycerols were identified and quantified by gas chromatography. Eastern Venezuela samples from Los Cedros, La Brea and Chaguaramas showed the highest total lipid values of 7.92, 7.74 and 7.53, respectively, and the minimum values were obtained for La Restinga (6.08%. Among lipid composition, Chacopata samples showed the lowest phospholipid concentration (48.86% and the maximum values for cholesterol (38.87% and triacylglycerols (12.26%; besides, La Esmeralda and Rio Caribe samples exhibited maximum phospholipids (88.71 and 84.93 respectively and minimum cholesterol (6.50 and 4.42% concentrations. Saturated fatty acids represented between 15.04% and 65.55% within total lipid extracts, with maximum and minimum values for La Esmeralda and Chacopata, respectively. Polyunsaturated results resulted between 7.80 and 37.18%, with higher values in La Brea and lower values in La Esmeralda. For phospholipids, saturated fatty acids concentrations varied between 38.81 and 48.68% for Chaguaramas and Chacopata samples, respectively. In the case of polyunsaturated fatty acids, these varied between non detected and 34.51%, with high concentrations in Los Cedros (27.97% and Chaguaramas (34.51% samples. For the triacylglycerols, the saturated fatty acids composition oscillated between 14.27 and 53.80% with low concentrations for Chacopata and high concentration

  9. Details of gastropod phylogeny inferred from 18S rRNA sequences.

    Science.gov (United States)

    Winnepenninckx, B; Steiner, G; Backeljau, T; De Wachter, R

    1998-02-01

    Some generally accepted viewpoints on the phylogenetic relationships within the molluscan class Gastropoda are reassessed by comparing complete 18S rRNA sequences. Phylogenetic analyses were performed using the neighbor-joining and maximum parsimony methods. The previously suggested basal position of Archaeogastropoda, including Neritimorpha and Vetigastropoda, in the gastropod clade is confirmed. The present study also provides new molecular evidence for the monophyly of both Caenogastropoda and Euthyneura (Pulmonata and Opisthobranchia), making Prosobranchia paraphyletic. The relationships within Caenogastropoda and Euthyneura data turn out to be very unstable on the basis of the present 18S rRNA sequences. The present 18S rRNA data question, but are insufficient to decide on, muricacean (Neogastropoda), neotaenioglossan, pulmonate, or stylommatophoran monophyly. The analyses also focus on two systellommatophoran families, namely, Veronicellidae and Onchidiidae. It is suggested that Systellommatophora are not a monophyletic unit but, due to the lack of stability in the euthyneuran clade, their affinity to either Opisthobranchia or Pulmonata could not be determined. PMID:9479694

  10. Evaluation of the levels of Br, Cl, K, Mg, Mn and V in Perna perna mussels (Linnaeus, 1758: Mollusca Bivalvia) collected in the coast of Sao Paulo state, Brazil; Avaliacao dos teores de Br, Cl, K, Mg, Mn e V em mexilhoes Perna perna (Linnaeus, 1758: Mollusca Bivalvia) coletados no litoral do estado de Sao Paulo, Brasil

    Energy Technology Data Exchange (ETDEWEB)

    Seo, Daniele

    2012-07-01

    The coastal environment has been heavily altered by multiple environmental impacts of human activities, such as disposal of sewage from urban areas, the release of numerous chemical industries, agriculture and the flow of vessels, which can lead to accidental spills of oil and oil products, fuels and other products transported by sea. In this context, a means of determining concentrations of these potentially toxic substances in the sea water is the biomonitoring by means of different types of bivalves, which have been used by various researchers, in Brazil and other countries. With regard to bivalve mollusks, particularly mussels, their use in monitoring the marine contamination is mainly due to their wide geographic distribution, sessile habit and ability to concentrate toxic metals to 102-105 times in relation to the concentrations detected in water. In the present study, we employed the passive biomonitoring using the Perna perna bivalve mollusk with respect to the elements Br, Cl, K, Mg, Mn and V. These elements were chosen since they can be determined by INAA method (Instrumental Neutron Activation Analysis), by means of short irradiation which provides faster analyzes and also due to their importance from the standpoint of environmental or nutritional studies. The aim of this study was to evaluate the content of Br, Cl, K, Mg, Mn and V in samples of Perna perna mussels (Linnaeus, 1758: Mollusca, Bivalvia) collected in coastal regions of Sao Paulo subject to anthropogenic contamination (Ponta de Itaipu and Palmas Island, in Santos), comparing the values obtained in sites potentially impacted with the values of the control site in Praia da Cocanha, in Caraguatatuba. The collection points located in Sao Paulo coast are located in the geographical areas 23 Masculine-Ordinal-Indicator 37'S - 45 Degree-Sign 24' W (Caraguatatuba) and 23 Masculine-Ordinal-Indicator 57'S - 46 Masculine-Ordinal-Indicator 20' W (Santos). The collection of organisms was performed in all seasons of the year, beginning in spring 2008 and ending in winter 2009. The samples were cleaned, crushed, homogenized and dried by lyophilization for further analysis by INAA. The INAA procedure consisted of irradiating aliquots of the samples obtained in powder form in polyethylene envelopes in the nuclear research reactor IEA - R1 of IPEN / CNEN - SP together with synthetic standards of elements. The irradiation time in the reactor was 8 to 10 s under the thermal neutron flux of 6.6 x 1012 n cm-2 s-1. The concentrations of the elements were calculated using the comparative method. The INAA procedure was validated with respect to accuracy and precision, through the analysis of certified reference materials NIST SRM 1566b Oyster Tissue and NIST SRM 2876 Mussel Tissue. The results of these certified reference materials indicated good quality of results with respect to precision and accuracy. The ranges of concentrations (dry basis weight) of the elements obtained in mussels collected in Santos and Praia da Cocanha for the four seasons of the year were: 173.80 to 358.99 mg kg-1 for Br; 45658 {+-} 1811 to 109166 {+-} 824 mg kg{sup -1} for Cl; 7043 {+-} 856 to 12506 {+-} 675 mg kg{sup -1} for K; 2774 {+-} 211 to 5691 {+-} 717 mg kg{sup -1} for Mg; 7.01 {+-} 0.30 to 29.74 {+-} 3.32 mg kg{sup -1} for Mn and 0.77 {+-} 0.02 to 3.43 {+-} 0.28 mg kg{sup -1} for V. The seasonal and spatial variations of the concentrations of these elements were studied and the values compared to the literature. From the results obtained it can be concluded that the species of Perna perna mussels, can be used as biomonitors of marine contamination. (author)

  11. Evaluation of the levels of Br, Cl, K, Mg, Mn and V in Perna perna mussels (Linnaeus, 1758: Mollusca Bivalvia) collected in the coast of Sao Paulo state, Brazil

    International Nuclear Information System (INIS)

    The coastal environment has been heavily altered by multiple environmental impacts of human activities, such as disposal of sewage from urban areas, the release of numerous chemical industries, agriculture and the flow of vessels, which can lead to accidental spills of oil and oil products, fuels and other products transported by sea. In this context, a means of determining concentrations of these potentially toxic substances in the sea water is the biomonitoring by means of different types of bivalves, which have been used by various researchers, in Brazil and other countries. With regard to bivalve mollusks, particularly mussels, their use in monitoring the marine contamination is mainly due to their wide geographic distribution, sessile habit and ability to concentrate toxic metals to 102-105 times in relation to the concentrations detected in water. In the present study, we employed the passive biomonitoring using the Perna perna bivalve mollusk with respect to the elements Br, Cl, K, Mg, Mn and V. These elements were chosen since they can be determined by INAA method (Instrumental Neutron Activation Analysis), by means of short irradiation which provides faster analyzes and also due to their importance from the standpoint of environmental or nutritional studies. The aim of this study was to evaluate the content of Br, Cl, K, Mg, Mn and V in samples of Perna perna mussels (Linnaeus, 1758: Mollusca, Bivalvia) collected in coastal regions of São Paulo subject to anthropogenic contamination (Ponta de Itaipu and Palmas Island, in Santos), comparing the values obtained in sites potentially impacted with the values of the control site in Praia da Cocanha, in Caraguatatuba. The collection points located in São Paulo coast are located in the geographical areas 23º 37'S - 45° 24' W (Caraguatatuba) and 23º 57'S - 46º 20' W (Santos). The collection of organisms was performed in all seasons of the year, beginning in spring 2008 and ending in winter 2009. The samples were cleaned, crushed, homogenized and dried by lyophilization for further analysis by INAA. The INAA procedure consisted of irradiating aliquots of the samples obtained in powder form in polyethylene envelopes in the nuclear research reactor IEA - R1 of IPEN / CNEN - SP together with synthetic standards of elements. The irradiation time in the reactor was 8 to 10 s under the thermal neutron flux of 6.6 x 1012 n cm-2 s-1. The concentrations of the elements were calculated using the comparative method. The INAA procedure was validated with respect to accuracy and precision, through the analysis of certified reference materials NIST SRM 1566b Oyster Tissue and NIST SRM 2876 Mussel Tissue. The results of these certified reference materials indicated good quality of results with respect to precision and accuracy. The ranges of concentrations (dry basis weight) of the elements obtained in mussels collected in Santos and Praia da Cocanha for the four seasons of the year were: 173.80 to 358.99 mg kg-1 for Br; 45658 ± 1811 to 109166 ± 824 mg kg-1 for Cl; 7043 ± 856 to 12506 ± 675 mg kg-1 for K; 2774 ± 211 to 5691 ± 717 mg kg-1 for Mg; 7.01 ± 0.30 to 29.74 ± 3.32 mg kg-1 for Mn and 0.77 ± 0.02 to 3.43 ± 0.28 mg kg-1 for V. The seasonal and spatial variations of the concentrations of these elements were studied and the values compared to the literature. From the results obtained it can be concluded that the species of Perna perna mussels, can be used as biomonitors of marine contamination. (author)

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

    Scientific Electronic Library Online (English)

    W Lobato, Paraense.

    2002-06-01

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

  13. Untersuchungen zum Harnsäuremetabolismus von Littorina littorea (Gastropoda)

    Science.gov (United States)

    Heil, K. P.; Eichelberg, D.

    1983-12-01

    Periwinkles, as typical inhabitants of sea-shores, are subjected to extreme changes of environmental conditions, which affect their excretion. In Littorina littorea uric acid, urea and ammonium were detected particularly in the kidney, but the only metabolite excreted was ammonium. Only the concentration of uric acid was dependent on the availability of water; decreasing periods of submersion during low tide and raised salinities caused a higher concentration of uric acid, while increasing periods of submersion and lowered salinities effected the opposite. Transfer of periwinkles within their intertidal habitat and laboratory experiments to test the effect of salinity showed that the concentration of uric acid in the kidney is adaptable. The dependence of uric acid concentration in the kidney on environmental conditions and the ammoniotelic excretion of L. littorea are discussed with regard to its particular living conditions. It is suggested that uric acid serves as nitrogen depot and has a particular function in osmoregulation.

  14. DIETARY NITROGEN AVAILABILITY IN MACROALGAE AFFECTS GROWTH OF THE SEA HARE APLYSIA CALIFORNICA (OPISTHOBRANCHIA:ANASPIDEA). (R830414)

    Science.gov (United States)

    The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Concl...

  15. Comportamento agregativo em Subulina octona (Brugüière) (Mollusca, Subulinidae) / Aggregative behavior in Subulina octona (Brugüière) (Mollusca, Subulinidae)

    Scientific Electronic Library Online (English)

    Sthefane, D' ávila; Roberto Júnio P., Dias; Elisabeth C. de A., Bessa.

    2006-06-01

    Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese O objetivo deste trabalho foi verificar a existência de comportamento agregativo na espécie Subulina octona (Brugüière, 1789) e obter evidências da mediação química desse comportamento. Foram utilizados 150 animais adultos, distribuídos em 15 caixas com terra vegetal (10 animais por caixa). Em cada [...] caixa foram colocados quatro discos plásticos identificados, em posição eqüidistante, os quais serviram como abrigos para os animais. No experimento I, foram colocados 10 animais no centro de cada caixa. Após 24, 48, 96, 120, 144 e 168 horas foram observados o número de agregados formados, a posição dos agregados (sob qual abrigo), o número de indivíduos por agregado e o número de indivíduos isolados. No experimento II, todos os indivíduos foram transferidos para outras caixas contendo terra vegetal, três novos discos e o disco que continha o maior agregado após as 168 horas do experimento I (denominado disco condicionado). Foi verificado, após 24 e 48 horas, o número de indivíduos sob o disco condicionado. Em todas as caixas utilizadas e em todos os intervalos de tempo observados no experimento I, houve a formação de agregados. Houve um aumento significativo do número de indivíduos por agregado e uma diminuição do número de indivíduos isolados com o passar do tempo (ANOVA, p Abstract in english The current study aimed to verify the existence of aggregative behavior in Subulina octona (Brugüière, 1789) and to obtain behavioral evidence of chemical mediation of this behavior. We used 150 adult animals allocated in 15 boxes with humus (10 animals per box). In each box we placed four identifie [...] d plastic disks in an equidistant position. These disks worked as shelters for the animals. In experiment I, 10 animals were put in the middle of each box. After 24, 48, 96, 120, 144, and 168 hours we observed the number of formed aggregations, as well as the position of the aggregates (in each shelter), the number of individual per aggregation and the number of isolated individuals. In order to test the hypothesis of conditioning of disks by chemicals compounds, the experiment II was carried out. All the individuals were transferred to other boxes with humus, three new disks and the disk containing the larger aggregate after the 168 hours of the experiment I (denominated conditioned disk). We verified, after 24 and 48 hours, the number of individuals below the conditioned disk. In experiment I, aggregations were observed in every used box and in every time intervals. In all boxes, there was a significant increase in the number of individuals per aggregation and a reduction in the number of isolated individuals until the end of the experiment (ANOVA, p

  16. Different roles for homologous interneurons in species exhibiting similar rhythmic behaviors.

    Science.gov (United States)

    Sakurai, Akira; Newcomb, James M; Lillvis, Joshua L; Katz, Paul S

    2011-06-21

    It is often assumed that similar behaviors in related species are produced by similar neural mechanisms. To test this, we examined the neuronal basis of a simple swimming behavior in two nudibranchs (Mollusca, Opisthobranchia), Melibe leonina and Dendronotus iris. The side-to-side swimming movements of Dendronotus [1] strongly resemble those of Melibe [2, 3]. In Melibe, it was previously shown that the central pattern generator (CPG) for swimming is composed of two bilaterally symmetric pairs of identified interneurons, swim interneuron 1 (Si1) and swim interneuron 2 (Si2), which are electrically coupled ipsilaterally and mutually inhibit both contralateral counterparts [2, 4]. We identified homologs of Si1 and Si2 in Dendronotus. (Henceforth, homologous neurons in each species will be distinguished by the subscripts (Den) and (Mel).) We found that Si2(Den) and Si2(Mel) play similar roles in generating the swim motor pattern. However, unlike Si1(Mel), Si1(Den) was not part of the swim CPG, was not strongly coupled to the ipsilateral Si2(Den), and did not inhibit the contralateral neurons. Thus, species differences exist in the neuronal organization of the swim CPGs despite the similarity of the behaviors. Therefore, similarity in species-typical behavior is not necessarily predictive of common neural mechanisms, even for homologous neurons in closely related species. PMID:21620707

  17. Benthic Macro-Fauna Composition and Abundance in Sombreiro River, Niger Delta, Nigeria

    Directory of Open Access Journals (Sweden)

    E.N. Ezekiel

    2011-04-01

    Full Text Available The benthic macro-fauna composition and abundance in sombreiro was studied for a period of two years (August 2007 - July2009. A total of twenty-eight species belonging to fourteen (14 families, six (6 classes and three (3 phyla were recorded in Sombreiro River. The phylum Annelida dominated with two classes (Oligochaeta and Polychaeta. Oligochaeta was represented by two families (Naididae and Lumbricidae and seven species having 25% by composition. Polychaeta was represented by seven families (Nereidae, Nepthyidae, Capitellidae, Eucinidae, Glyceridae, Arenicolidae and Syllidae and thirteen species having 46.4% by composition. The Phylum arthropoda was represented by two classes (Crustacea and inseita. Two families (Gammaridae and Penaidae having two species consisting of 7.2% were recorded, for the class crustacea. The class insecta was represented by one family (Chironomidae with one species consisting of 3.6%. The phylum Mollusca was represented by two classes (Gastropoda and Bivalvia. Gastropoda had two species with 7.2% composition and Bivalvia has three species with10.7% composition. Oligochaeta was the highest and constituted 62.0%. The others were Polychaeta (23.9%, Insecta (6.7%, Gastropoda (3.9%, Bivalvia (2.2% and Crustacea (1.3%. The mean diversity(S ranged between 11 species. Mean abundance of individuals (N was 985. Mean Margalef index (d value was 1.339. The mean value for Shannon-Wienner (H was 0.956. Mean Pielou’s index of relative density or evenness index (E was 0.986. Mean SimpsIn’s Dominance index (C was 0.623.

  18. Biomphalaria prona (Gastropoda: Planorbidae): a morphological and biochemical study

    Scientific Electronic Library Online (English)

    W. Lobato, Paraense; J. P., Pointier; B., Delay; A. F., Pernot; R. N., Incani; C., Balzan; P., Chrosciechowski.

    1992-06-01

    Full Text Available SciELO Brazil | Language: English Abstract in english Two samples of Biomphalaria prona (Martens, 1873) from Lake Valencia (type locality) and seven from other Venezuelan localities were studied morphologically (shell and reproductive system) and biochemically (allozyme electrophoresis). In spite of marked differences in shell characters, all of them p [...] roved indistinguishable under the anatomic and biochemical criteria. So far B. prona has been considered an endemic species, restricted to Lake Valencia. It is now demonstrated that the extralacustrine populations refered to Biomphalaria havanensis (Pfeiffer, 1839) by several authors correspond in shell characters to an extreme variant of B. prona from the Lake and really belong to the last*mentioned species. They may be regarded as the result of a process of directional selection favoring a shell phenotype other than those making up the modal class in the Lake.

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

    OpenAIRE

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

    2004-01-01

    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.

  20. Transferência do gênero monotípico Parodizia Medina de Bithyniidae (Gastropoda, Prosobranchia para Pyramidellidae (Gastropoda, Heterobranchia Transference of the monotypic genus Parodizia Medina from Bithyniidae Gray (Gastropoda, Prosobranchia to Pyramidellidae Gray (Gastropoda, Heterobranchia

    Directory of Open Access Journals (Sweden)

    Maria Cristina Pons da Silva

    2004-06-01

    Full Text Available Propõe-se a transferência do gênero monitípico Parodizia Medina, 1959 de Bithyniidae (Prosobranchia para Pyramidellidae (Heterobranchia. A proposta está baseada em dados morfológicos de espécimens de P. uruguayensis Medina, 1959 procedentes da bacia do rio Tramandaí, Rio Grande do Sul, Brasil.The transference of the monotypic genus Parodizia Medina, 1959 from Bithyniidae (Prosobranchia to Pyramidellidae (Heterobranchia is proposed. The proposal is based on some morphological data of P. uruguayensis Medina, 1959 from Tramandaí river basin, Rio Grande do Sul, Brazil.

  1. New Bythinella (Gastropoda, Bythinellidae) species from western Turkey.

    Science.gov (United States)

    Y?ld?r?m, Mehmet Zeki; Kebapç?, Ümit; Koca, Seval Bahad?r; Yüce, Arzu

    2015-01-01

    Bythinellaanatolica sp. n., Bythinellaistanbulensis sp. n., Bythinellamagdalenae sp. n., and Bythinellawilkei sp. n. from western Turkey are described herein. Illustrations of the shell and genitalia of the newly described taxa, together with comparisons with previously known Bythinella taxa and a key to the species from western Turkey, are also provided. PMID:25685028

  2. Seasonal burrowing behavior and ecology of aporrhais occidentalis (gastropoda : strombacea).

    Science.gov (United States)

    Perron, F E

    1978-06-01

    1. SCUBA observations and in situ tagging experiments were carried out on a population of Aporrhais occidentalis during 1973-1976. Seasonal changes in burrowing behavior were quantified by determining the percentage of tagged snails found burrowing each month. Gut content analyses were performed at monthly intervals to determine if the intensity of feeding activity fluctuates seasonally. Empty A. occidentalis shells were collected and examined for evidence of predation. 2. Specimens of A. occidentalis alternate between periods of epifaunal activity and infaunal quiescence. Tagged snails tended to remain burrowed from August through January, but were active on the surface of the substrate from February until late summer. Gut content analyses showed that the snails fed actively during their epifaunal period, but ceased feeding while burrowed. 3. Laboratory attempts to influence burrowing behavior by manipulating water temperature were unsuccessful. 4. Published observations on eastern Atlantic species of Aporrhais suggest that seasonal burrowing behavior may be characteristic of the genus. PMID:20693371

  3. Molecular phylogeny of the western Palaearctic Helicoidea (Gastropoda, Stylommatophora).

    Science.gov (United States)

    Razkin, Oihana; Gómez-Moliner, Benjamín Juán; Prieto, Carlos Enrique; Martínez-Ortí, Alberto; Arrébola, José Ramón; Muñoz, Benito; Chueca, Luis Javier; Madeira, María José

    2015-02-01

    The Helicoidea is one of the most diverse superfamilies of terrestrial land snails. In this study we present a molecular phylogeny of the western Palaearctic Helicoidea obtained by means of neighbor joining, maximum likelihood and Bayesian analysis of the mitochondrial 16S rRNA gene fragment and the nuclear rRNA gene cluster including the 3' end of the 5.8S gene, the complete ITS2 region and 5' end of the large subunit 28S. Most of the morphologically-defined families were confirmed. We propose a revised phylogenetic classification so that families, subfamilies and tribes are monophyletic. The family Hygromiidae sensu Hausdorf and Bouchet (2005) is divided into three clades which are here given familial rank: Canariellidae and Geomitridae, which are recognized for the first time at familial rank, and Hygromiidae s.str. (including Ciliella and Trochulus) that is here restricted. The subfamilies Ciliellinae, Geomitrinae, Hygromiinae, Monachainae and Trochulinae recognized in current classifications were not recovered as monophyletic groups. The family Cochlicellidae is here given tribe rank (Cochlicellini) belonging to the Geomitridae. We describe a new tribe, Plentuisini. Three subfamilies are recognized within Helicidae: Ariantinae, Helicinae (including Theba) and Murellinae. New classification indicates that free right ommatophore retractor muscle arose only once within Geomitridae. The anatomy of the auxiliary copulatory organs of the reproductive system of families, subfamilies and tribes is highlighted. We estimate the origin of the Helicoidea at the end of the Early Cretaceous and its families as Late-Cretaceous to Paleogene. Western Palaearctic Helicoidea belongs to two different lineages that diverged around 86Ma ago, both starting their diversification at the end of the Cretaceous (around 73-76Ma). Radiation of some western Helicoidean families started during the Eocene. PMID:25485783

  4. Silurian Gastropoda from the Alexander terrane, southeast Alaska

    Science.gov (United States)

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

    2008-01-01

    Gastropods are described from Ludlow-age strata of the Heceta Limestone on Prince of Wales Island, southeast Alaska. They are part of a diverse megabenthic fauna of the Alexander terrane, an accreted terrane of Siberian or Uralian affinities. Heceta Limestone gastropods with Uralian affinities include Kirkospira glacialis, which closely resembles "Pleurotomaria" lindstromi Oehlert of Chernyshev, 1893, Retispira cf. R. volgulica (Chernyshev, 1893), and Medfracaulus turriformis (Chernyshev, 1893). Medfracaulus and similar morphotypes such as Coelocaulus karlae are unknown from rocks that are unquestionably part of the North American continent (Laurentia) during Late Silurian time. Beraunia is previously known only from the Silurian of Bohemia. Pachystrophia has previously been reported only from western North American terranes (Eastern Klamath, York, and Farewell terranes) and Europe. Bathmopterus Kirk, 1928, is resurrected and is only known from the Silurian of southeast Alaska. Newly described taxa include Hecetastoma gehrelsi n. gen. and n. sp. and Baichtalia tongassensis n. gen. and n. sp. ??2008 The Geological Society of America.

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

    Directory of Open Access Journals (Sweden)

    Diaz Jose L

    2010-07-01

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

  6. Physella acuta: atypical mitochondrial gene order among panpulmonates (Gastropoda).

    Science.gov (United States)

    Nolan, Journey R; Bergthorsson, Ulfar; Adema, Coen M

    2014-11-01

    Mitochondrial (mt) sequences are frequently used for phylogenetic reconstruction and for identification of species of molluscs. This study expands the phylogenetic range of Hygrophila (Panpulmonata) for which such sequence data are available by characterizing the full mt genome of the invasive freshwater snail Physella acuta (Physidae). The mt genome sequences of two P. acuta isolates from Stubblefield Lake, New Mexico, USA, differed in length (14,490 vs 14,314 bp) and showed 11.49% sequence divergence, whereas ITS1 and ITS2 sequences from the nuclear genome differed by 1.75%. The mt gene order of P. acuta (cox1, P, nad6, nad5, nad1, D, F, cox2, Y, W, nad4L, C, Q, atp6, R, E, rrnS, M, T, cox3, I, nad2, K, V, rrnL, L1, A, cytb, G, H, L2, atp8, N, nad2, S1, S2, nad4) differs considerably from the relatively conserved gene order within Panpulmonata. Phylogenetic trees show that the 13 protein-encoding mt gene sequences (equivalent codons) of P. acuta group according to gastropod phylogeny, yet branch lengths and dN/dS ratios for P. acuta indicate elevated amino acid substitutions relative to other gastropods. This study indicates that mt sequences of P. acuta are phylogenetically informative despite a considerable intraspecific divergence and the atypical gene order in its mt genome. PMID:25368439

  7. A revision of the Annulariidae of Central America (Gastropoda: Littorinoidea).

    Science.gov (United States)

    Watters, G Thomas

    2014-01-01

    Twenty annulariid taxa are reviewed from Central America, including three new species and one new genus. One species is regarded as an incertae sedis and two as mislabeled lots of Cuban origin. Many species are highly endemic. Although not speciose, Central America has a high diversity of conchological forms and may represent the ancestral source of annulariids in general. PMID:25544449

  8. Redescription of Bellerophon bittneri (Gastropoda: Triassic) from Wyoming.

    Science.gov (United States)

    Yochelson, E.L.; Boyd, D.W.; Wardlaw, B.

    1985-01-01

    Bellerophon bittneri Newell and Kummel is an Early Triassic bellerophontacean from the Dinwoody Formation in the Wind River Mountains. The available type material consists of one fair, but incomplete, external mold, which resembles a Bellerophon but is actually a Retispira. After repeated search, additional specimens were found at one locality in the southern Wind River Range of Wyoming; Retispira bittneri is redescribed from this new material. Like other Triassic bellerophontaceans, there is nothing unusual about the species apart from occurrence in the Mesozoic; it is clearly congeneric with Permian Retispira from underlying rocks. -Authors

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

    Directory of Open Access Journals (Sweden)

    Luiz Ricardo L. Simone

    2006-01-01

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

  10. Redescription of Spirodentalium Walcott ( Gastropoda: Late Cambrian) from Wisconsin ( USA).

    Science.gov (United States)

    Yochelson, E.L.

    1987-01-01

    Spirodentalium Walcott, 1890, was originally described as a scaphopod. A reinterpretation of the type lot suggests that its overall shape is that of an open-coiled gastropod. If so, this is probably the earliest known open-coiled form and it is sinistral in coiling direction. -Author

  11. Biomphalaria prona (Gastropoda: Planorbidae: a morphological and biochemical study

    Directory of Open Access Journals (Sweden)

    W. Lobato Paraense

    1992-06-01

    Full Text Available Two samples of Biomphalaria prona (Martens, 1873 from Lake Valencia (type locality and seven from other Venezuelan localities were studied morphologically (shell and reproductive system and biochemically (allozyme electrophoresis. In spite of marked differences in shell characters, all of them proved indistinguishable under the anatomic and biochemical criteria. So far B. prona has been considered an endemic species, restricted to Lake Valencia. It is now demonstrated that the extralacustrine populations refered to Biomphalaria havanensis (Pfeiffer, 1839 by several authors correspond in shell characters to an extreme variant of B. prona from the Lake and really belong to the last*mentioned species. They may be regarded as the result of a process of directional selection favoring a shell phenotype other than those making up the modal class in the Lake.

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

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    J. L. de Barros Araujo

    1963-06-01

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

  13. ESR studies of ?-irradiated Rapana venosa (Gastropoda, Muricidae) shell

    International Nuclear Information System (INIS)

    The unirradiated as well as 60Co ?-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 ?-irradiation in Rapana shell whose g-factors varied from 1.9976 to 2.0057 were attributed to CO2-, CO33-, CO3-, and SO2- 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 CO2- and CO33- free radicals

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

    Scientific Electronic Library Online (English)

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

    2009-08-01

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

  15. Morphological analysis of the Chinese Cipangopaludina species (Gastropoda; Caenogastropoda: Viviparidae).

    Science.gov (United States)

    Lu, Hong-Fa; Du, Li-Na; Li, Zhi-Qiang; Chen, Xiao-Yong; Yang, Jun-Xing

    2014-11-01

    Viviparidae are widely distributed around the globe, but there are considerable gaps in the taxonomic record. To date, 18 species of the viviparid genus Cipangopaludina have been recorded in China, but there is substantial disagreement on the validity of this taxonomy. In this study, we described the shell and internal traits of these species to better discuss the validity of related species. We found that C. ampulliformis is synonym of C. lecythis, and C. wingatei is synonym of C. chinensis,while C. ampullacea and C. fluminalis are subspecies of C. lecythis and C. chinensis, respectively. C. dianchiensis should be paled in the genus Margarya, while C. menglaensis and C. yunnanensisbelong to genus Mekongia. Totally, this leaves 11 species and 2 subspecies recorded in China. Based on whether these specimens' spiral whorl depth was longer than aperture depth, these species or subspecies can be further divided into two groups, viz. chinensis group and cathayensis group, which can be determined from one another via the ratio of spiral depth and aperture depth, vas deferens and number of secondary branches of vas deferens. Additionally, Principal Component Analysis indicated that body whorl depth, shell width, aperture width and aperture length were main variables during species of Cipangopaludina. A key to all valid Chinese Cipangopaludina specieswere given. PMID:25465086

  16. Silurian gastropoda from southeastern and west-central Alaska

    Science.gov (United States)

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

    2008-01-01

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

  17. A new species of Lyria (Gastropoda: Volutidae) from Southern Japan.

    Science.gov (United States)

    Bail, Patrice; Chino, Mitsuo

    2015-01-01

    A new endemic species of Volutidae, Lyria (Lyria) ogasawarana sp. nov. is described from Chichijima Island, Ogasawara Islands, Japan. This new species is similar to the other Pacific Lyria: L. (Lyria) cassidula cassidula (Reeve, 1849), L. (Lyria) deliciosa (Montrousier, 1859), L. (Lyria) pattersonia (Perry, 1811) and L. (Lyria) insignata (Iredale, 1940). PMID:25781775

  18. ESR studies of ?-irradiated Rapana venosa (Gastropoda, Muricidae) shell

    Science.gov (United States)

    Dana Seletchi, Emilia; Duliu, Octavian G.; Georgescu, Rodica

    2007-10-01

    The unirradiated as well as 60Co ?-ray irradiated up to 11.3 kGy shells of veined Rapana Whelk ( Rapana venosa), collected from the Black Sea coasts (Romania) were investigated by ESR technique. The radicals produced by ?-irradiation in Rapana shell whose g-factors varied from 1.9976 to 2.0057 were attributed to CO2-, CO33-, CO3-, and SO2- 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 °C) revealed an exponential decrease of the ESR amplitude with the annealing time for CO2- and CO33- free radicals.

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

    Scientific Electronic Library Online (English)

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

    2012-06-01

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

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

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    Md. Moniruzzaman Sarker

    2007-01-01

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

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

    Science.gov (United States)

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

    2014-09-01

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

  2. Ultrastructural studies of oogenesis in Bolinus brandaris(Gastropoda: Muricidae).

    OpenAIRE

    Amor Pe?rez, Ma Jose?; Ramo?n Herrero, Montserrat; Durfort I Coll, Merce?

    2004-01-01

    Ultrastructural studies of oogenesis in Bolinus brandaris are described. Although the initial phase of oogenesis is common to most animal species, vitellogenesis can be considered a species-specific characteristic. In the vitellogenesis of B.brandaris, mitochondria and endoplasmic reticula play a relevant role in the formation of myelinised membranous systems. Nuclear envelope, Golgi body and the oocyte plasma membrane invaginations are three possible origins for annulate lamellae. The latter...

  3. Ultrastructural studies of oogenesis in Bolinus brandaris (Gastropoda: Muricidae)

    OpenAIRE

    Amor, Mari?a Jose?; Ramo?n, Montserrat; Durfort, Merce?

    2004-01-01

    Ultrastructural studies of oogenesis in Bolinus brandaris are described. Although the initial phase of oogenesis is common to most animal species, vitellogenesis can be considered a species-specific characteristic. In the vitellogenesis of B.brandaris, mitochondria and endoplasmic reticula play a relevant role in the formation of myelinised membranous systems. Nuclear envelope, Golgi body and the oocyte plasma membrane invaginations are three possible origins for annulate lamellae. The latter...

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

    Directory of Open Access Journals (Sweden)

    Dilian Georgiev

    2013-06-01

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

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

    Directory of Open Access Journals (Sweden)

    Dilian Georgiev

    2013-10-01

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

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

    Scientific Electronic Library Online (English)

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

    2014-12-01

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

  7. Late Paleocene Architectonicidae (Gastropoda: Heterobranchia) from Baja California, Mexico / Architectonicidae (Gastropoda: Heterobranchia) del Paleoceno Tardío de Baja California, México

    Scientific Electronic Library Online (English)

    María del Carmen, Perrilliat.

    2013-04-01

    Full Text Available SciELO Mexico | Language: English Abstract in spanish Se describen e ilustran seis especies de arquitectonícidos de los géneros Architectonica, Granosolarium y Pseudomalaxis del Paleoceno Tardío, provenientes de la Formación Sepultura en la región norte de Baja California. Dos especies nuevas, Architectonica bieleri y Architectonica bajaensis, se descr [...] iben con base en especímenes bien conservados. Los géneros Granosolarium y Pseudomalaxis se reportan por primera vez para Baja California. Abstract in english Six gastropod species including two new ones, belonging to the family Architectonicidae, of the genera Architectonica, Granosolarium and Pseudomalaxis, are described for the Late Paleocene Sepultura Formation in Baja California, northwestern Mexico. The new species Architectonica bieleri and Archite [...] ctonica bajaensis are established from well preserved specimens. The genera Granosolarium and Pseudomalaxis are for the first time reported in Baja California.

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

    Scientific Electronic Library Online (English)

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

    2014-06-01

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

  9. Biodiversity and biogeography of Antarctic and sub-Antarctic mollusca

    Science.gov (United States)

    Linse, Katrin; Griffiths, Huw J.; Barnes, David K. A.; Clarke, Andrew

    2006-04-01

    For many decades molluscan data have been critical to the establishment of the concept of a global-scale increase in species richness from the poles to the equator. Low polar diversity is key to this latitudinal cline in diversity. Here we investigate richness patterns in the two largest classes of molluscs at both local and regional scales throughout the Southern Ocean. We show that biodiversity is very patchy in the Southern Ocean (at the 1000-km scale) and test the validity of historical biogeographic sub-regions and provinces. We used multivariate analysis of biodiversity patterns at species, genus and family levels to define richness hotspots within the Southern Ocean and transition areas. This process identified the following distinct sub-regions in the Southern Ocean: Antarctic Peninsula, Weddell Sea, East Antarctic—Dronning Maud Land, East Antarctic—Enderby Land, East Antarctic—Wilkes Land, Ross Sea, and the independent Scotia arc and sub Antarctic islands. Patterns of endemism were very different between the bivalves and gastropods. On the basis of distributional ranges and radiation centres of evolutionarily successful families and genera we define three biogeographic provinces in the Southern Ocean: (1) the continental high Antarctic province excluding the Antarctic Peninsula, (2) the Scotia Sea province including the Antarctic Peninsula, and (3) the sub Antarctic province comprising the islands in the vicinity of the Antarctic Circumpolar Current.

  10. Ophieulima (Mollusca, prosobranchia), a new genus of ophiuroid parasites

    OpenAIRE

    Waren, A.; Sibuet, Myriam

    1981-01-01

    Le genre Ophieulima a été créé pour StilifeT minima DALI., 1927, qui a été découvert sous forme de parasite de l'Ophiure Ophiactis abyssicola (M. SARS). O. minima a une larve planctonique et est distribuée des deux côtés de l'océan Atlantique Nord. Les sexes sont séparés et la femelle attache les capsules ovigères à la coquille du mâle. Le gastéropode est attaché à la face dorsale de l'hôte par un organe en forme de 'tuyère' et introduit son proboscis à l'intérieur du c...

  11. Mollusca, Cephalopoda. Guerra, A. - 1992. Fauna Ibérica, vol. 1

    OpenAIRE

    Sa?nchez, Pilar

    1994-01-01

    This book is the first of a new series on the Iberian fauna patronised, like Flora Iberica, by the Consejo Superior de Investigaciones Científicas. The book will be of great interest to all marine research centres and university libraries, and will undoubtedly be greatly appreciated by researchers, including non-specialists, who are interested in Cephalopoda. It is set to become a reference book for future scientilic work on this species within the confines of the Mediterranean and Atlantic ...

  12. Morphological and molecular diversity of Unionidae (Mollusca, Bivalvia from Portugal

    Directory of Open Access Journals (Sweden)

    Reis, J.

    2013-06-01

    Full Text Available Freshwater mussels from the family Unionidae are known to exhibit a high level of ecological phenotypic plasticity that is reflected in their shell shape. This variation has caused uncertainty on systematics and taxonomy of the group. Several naiad populations from nine river basins from Portugal were analyzed genetically, using two mitochondrial gene fragments (16SrRNA and Cytochrome Oxidase I and morphologically, using ANOVA analyses of shell dimmensions. Molecular phylogenetic analyses were used to revise the systematics and to infer an evolutionary hypothesis for the family at the western-most Atlantic Iberian Peninsula. Genetic and morphological data were in agreement and supported the occurrence of 5 species in the region: Anodonta anatina, Anodonta cygnea, Potomida littoralis, Unio tumidiformis and Unio delphinus. The differentiation of all these species, except A. cygnea, is thought to have taken place during the isolation of the Iberian Peninsula and formation of the current river basins in the Tertiary. The possibility of A. cygnea being a relatively recent introduction is discussed. Basic morphometric measures of the shell proved to be useful to separate Unio species, but also seem to be strongly affected by environmental conditions. The high intra-specific morphologic variation was partially related to the species’ high level of phenotypic plasticity, but seems to have an important role in evolutionary processes.Las náyades de la familia Unionidae tienen gran plasticidad fenotípica, lo que se refleja en la forma de su concha. Esta variabilidad morfológica ha sido causa de gran confusión en la taxonomía y sistemática del grupo. Se han estudiado, genética y morfológicamente, numerosas poblaciones de náyades provenientes de nueve cuencas hidrográficas portuguesas. Para ello se han analizando dos fragmentos de genes mitocondriales (ARNr 16S y Citocromo Oxidasa I así como diferentes variables morfológicas de la concha. Se han realizado además análisis filogenéticos para conocer la sistemática de la familia e inferir una hipótesis evolutiva de su distribución en el oeste de la península Ibérica. Los datos genéticos y morfológicos sugieren la existencia de cinco especies: Anodonta anatina, Anodonta cygnea, Potomida littoralis, Unio tumidiformis y Unio delphinus. La diferenciación de estas especies, con la excepción de A. cygnea, ha ocurrido durante el aislamiento de la península Ibérica y posterior formación de las actuales cuencas hidrográficas en el Terciario. Se discute la posibilidad de que la presencia de A. cygnea se deba a una introducción reciente. Los datos morfométricos analizados pueden ser útiles para separar las especies del género Unio, pero son también dependientes de las condiciones ambientales. La elevada variabilidad morfológica dentro de cada especie está relacionada con su plasticidad fenotípica, pero tiene a su vez un importante papel en el proceso evolutivo.

  13. Gundlachia dutrae: n. sp. from northwest Brazil (Mollusca: Basommatophora: Ancylidae

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    Sonia Barbosa dos Santos

    1994-06-01

    Full Text Available A new species of Gundlachia, Gundlachia dutrae is described from northwest Brazil. It is distinguishable from other congenerie species by characteristics of the shell, radula and internal organs. Shell relatively high. Aperture near-circular; periostracum dark brown without periostracal hairs. Apex slightly inclined to the right, projected but not hooked, with an apical depression surrounted by a sculpture of well-marked irregular punctations. Shell surface with prominent radial sculpture. No septate specimens were observed. Ratios (n= 59: shell width/shell lenght = 0,66- 0,79 (mean 0,73; shell height/shell length = 0,32- 0,45 ( mean 0,37; shell height/shell width = 0,43- 0,63 (mean 0,51. Body of normal ancylid type; mantle pigmentation dark brown or black, concentrated along the mantle collar. The dorsal surface of the right anterior muscle is elongated and medially constricted. The left anterior and the posterior muscles are almost elliptical. Adhesive area is V-shaped. Pseudobranch unpigmented bearing a very small and thin dorsal lobe. Ovotestis with more than 25 unbranched diverticula. Ovispermiduct with seminal vesicle rather developed. Elongated nidamental gland continous with the glandular wall of the uterus. Nidamental gland appendix ending into a bulbous swelling Spermathecal body almost rounded. Well-developed prostate with five long diverticula. Ejaculatory complex with long glandular flagellum, without a penis or true ultra-penis. "Penis sheath" developed. "Ultra-penis" projected as a tube inside the lumem of prepuce, with a slit between "ultra-penis" and "penis sheath". Rachidian tooth tetracuspid, with two median cusps assymmetrical and aculeated. Lateral teeth tricuspid, with a reduced endocon and a prominent mesocon. A well marked gap occurs between meso and ectocon. Marginal teeth similar to lateral ones. Jaw T-shaped, with about 28 dorsal plates.

  14. Gundlachia dutrae: n. sp. from northwest Brazil (Mollusca: Basommatophora: Ancylidae)

    OpenAIRE

    Sonia Barbosa dos Santos

    1994-01-01

    A new species of Gundlachia, Gundlachia dutrae is described from northwest Brazil. It is distinguishable from other congenerie species by characteristics of the shell, radula and internal organs. Shell relatively high. Aperture near-circular; periostracum dark brown without periostracal hairs. Apex slightly inclined to the right, projected but not hooked, with an apical depression surrounted by a sculpture of well-marked irregular punctations. Shell surface with prominent radial sculpture. No...

  15. Gundlachia dutrae: n. sp. from northwest Brazil (Mollusca: Basommatophora: Ancylidae)

    Scientific Electronic Library Online (English)

    Sonia Barbosa dos, Santos.

    1994-06-01

    Full Text Available A new species of Gundlachia, Gundlachia dutrae is described from northwest Brazil. It is distinguishable from other congenerie species by characteristics of the shell, radula and internal organs. Shell relatively high. Aperture near-circular; periostracum dark brown without periostracal hairs. Ape [...] x slightly inclined to the right, projected but not hooked, with an apical depression surrounted by a sculpture of well-marked irregular punctations. Shell surface with prominent radial sculpture. No septate specimens were observed. Ratios (n= 59): shell width/shell lenght = 0,66- 0,79 (mean 0,73); shell height/shell length = 0,32- 0,45 ( mean 0,37); shell height/shell width = 0,43- 0,63 (mean 0,51). Body of normal ancylid type; mantle pigmentation dark brown or black, concentrated along the mantle collar. The dorsal surface of the right anterior muscle is elongated and medially constricted. The left anterior and the posterior muscles are almost elliptical. Adhesive area is V-shaped. Pseudobranch unpigmented bearing a very small and thin dorsal lobe. Ovotestis with more than 25 unbranched diverticula. Ovispermiduct with seminal vesicle rather developed. Elongated nidamental gland continous with the glandular wall of the uterus. Nidamental gland appendix ending into a bulbous swelling Spermathecal body almost rounded. Well-developed prostate with five long diverticula. Ejaculatory complex with long glandular flagellum, without a penis or true ultra-penis. "Penis sheath" developed. "Ultra-penis" projected as a tube inside the lumem of prepuce, with a slit between "ultra-penis" and "penis sheath". Rachidian tooth tetracuspid, with two median cusps assymmetrical and aculeated. Lateral teeth tricuspid, with a reduced endocon and a prominent mesocon. A well marked gap occurs between meso and ectocon. Marginal teeth similar to lateral ones. Jaw T-shaped, with about 28 dorsal plates.

  16. First molecular phylogeny of the subfamily Polycerinae (Mollusca, Nudibranchia, Polyceridae)

    Science.gov (United States)

    Palomar, Gemma; Pola, Marta; Garcia-Vazquez, Eva

    2014-03-01

    The subfamily Polycerinae includes four genera with around 46 species described to date. This subfamily is characterized by a limaciform body, which may have simple tentacular processes on the margin of the oral veil. Phylogenetic relationships between the genera of the subfamily Polycerinae (Polyceridae) have not yet been studied, and therefore, the only available information is based on morphological descriptions. The present study reports the first phylogenetic analysis of Polycerinae based on the mitochondrial genes cytochrome oxidase subunit I and the large ribosomal subunit (16S rRNA) using maximum likelihood and Bayesian methods. Our results showed that Polycerinae is monophyletic, but the relationships within the subfamily as well as within Polycera remain unresolved. A key finding of this study is that there are clearly two sympatric species of Polycera present in South Africa: Polycera capensis Quoy and Gaimard, 1824 also found in Australia and an undescribed Polycera sp. On the other hand, the studied specimens of the genus Gymnodoris were clustered within Polycerinae, reopening the problem of the systematic position of this genus. Additional genes and species of Polycerinae and Gymnodoris would provide more information and probably fully resolve this situation.

  17. Planorbidae, Lymnaeidae and Physidae of Argentina (Mollusca: Basommatophora

    Directory of Open Access Journals (Sweden)

    W Lobato Paraense

    2005-08-01

    Full Text Available In the course of several trips to Argentina I had the opportunity of collecting specimens of Acrorbis petricola Odhner,1937, Biomphalaria orbignyi Paraense, 1975, B. peregrina (Orbigny, 1835, B. tenagophila (Orbigny, 1835 Lymnaea viatrix Orbigny, 1835, Antillorbis nordestensis (Lucena, 1954, B. intermedia (Paraense & Deslandes, 1962, B. oligoza Paraense, 1974, B. straminea (Dunker, 1848, Drepanotrema anatinum (Orbigny, 1835, D. cimex (Moricand, 1837, D. depressissimum (Moricand, 1837, D. heloicum (Orbigny, 1835, D. kermatoides (Orbigny, 1835, D. lucidum (Pfeiffer, 1839, L. columella Say, 1817, Physa acuta Draparnaud, 1805, and P. marmorata Guilding, 1828.

  18. Planorbidae, Lymnaeidae and Physidae of Ecuador (Mollusca: Basommatophora)

    Scientific Electronic Library Online (English)

    W Lobato, Paraense.

    2004-06-01

    Full Text Available In the course of a trip to Ecuador I had the opportunity of collecting topotypic specimens of the following nominal species of pulmonate molluscs: Biomphalaria cousini Paraense, 1966; Planorbis equatorius Cousin, 1887; P. canonicus Cousin, 1887; Lymnaea cousini Jousseaume, 1887 and P. boetzkesi Mill [...] er, 1879. Additional findings were: Helisoma trivolvis (Say, 1817), Biomphalaria peregrina (Orbigny 1835), Drepanotrema anatinum (Orbigny, 1835), D. kermatoides (Orbigny, 1835), D. lucidum (Pfeiffer, 1839), D. surinamense (Clessin, 1884), Lymnaea columella Say, 1817 and Physa acuta Draparnaud, 1805. P. boetzkesi and P. canonicus are considered junior synonyms of Gyraulus hindsianus (Dunker, 1848) and Biomphalaria peregrina (Orbigny, 1835), respectively.

  19. Planorbidae, Lymnaeidae and Physidae of Argentina (Mollusca: Basommatophora)

    Scientific Electronic Library Online (English)

    W Lobato, Paraense.

    2005-08-01

    Full Text Available In the course of several trips to Argentina I had the opportunity of collecting specimens of Acrorbis petricola Odhner,1937, Biomphalaria orbignyi Paraense, 1975, B. peregrina (Orbigny, 1835), B. tenagophila (Orbigny, 1835) Lymnaea viatrix Orbigny, 1835, Antillorbis nordestensis (Lucena, 1954), B. i [...] ntermedia (Paraense & Deslandes, 1962), B. oligoza Paraense, 1974, B. straminea (Dunker, 1848), Drepanotrema anatinum (Orbigny, 1835), D. cimex (Moricand, 1837), D. depressissimum (Moricand, 1837), D. heloicum (Orbigny, 1835), D. kermatoides (Orbigny, 1835), D. lucidum (Pfeiffer, 1839), L. columella Say, 1817, Physa acuta Draparnaud, 1805, and P. marmorata Guilding, 1828.

  20. Planorbidae, Lymnaeidae and Physidae of Peru (Mollusca: Basommatophora)

    Scientific Electronic Library Online (English)

    W Lobato, Paraense.

    2003-09-01

    Full Text Available In the course of several trips to Peru I had the opportunity of collecting topotypic specimens of Biomphalaria andecola (Orbigny, 1835), B. helophila (Orbigny, 1835), B. pucaraensis (Preston, 1909), Drepanotrema limayanum (Lesson, 1830), D. kermatoides (Orbigny, 1835), and Lymnaea viatrix Orbigny, 1 [...] 835, besides B. tenagophila (Orbigny, 1835), Helisoma trivolvis (Say, 1817), H. duryi (Wetherby, 1879), Physa acuta Draparnaud, 1801, and seemingly P. peruviana Gray, 1828. B. pucaraensis is considered a junior synonym of B. peregrina (Orbigny, 1835).

  1. Planorbidae, Lymnaeidae and Physidae of Ecuador (Mollusca: Basommatophora

    Directory of Open Access Journals (Sweden)

    W Lobato Paraense

    2004-06-01

    Full Text Available In the course of a trip to Ecuador I had the opportunity of collecting topotypic specimens of the following nominal species of pulmonate molluscs: Biomphalaria cousini Paraense, 1966; Planorbis equatorius Cousin, 1887; P. canonicus Cousin, 1887; Lymnaea cousini Jousseaume, 1887 and P. boetzkesi Miller, 1879. Additional findings were: Helisoma trivolvis (Say, 1817, Biomphalaria peregrina (Orbigny 1835, Drepanotrema anatinum (Orbigny, 1835, D. kermatoides (Orbigny, 1835, D. lucidum (Pfeiffer, 1839, D. surinamense (Clessin, 1884, Lymnaea columella Say, 1817 and Physa acuta Draparnaud, 1805. P. boetzkesi and P. canonicus are considered junior synonyms of Gyraulus hindsianus (Dunker, 1848 and Biomphalaria peregrina (Orbigny, 1835, respectively.

  2. Novas ocorrências de gastrópodes e bivalves marinhos no Brasil (Mollusca

    Directory of Open Access Journals (Sweden)

    Absalão Ricardo Silva

    2003-01-01

    Full Text Available The gastropods Costaclis egregia (Dall, 1889, Thaleia nisonis (Dall, 1889, Tjaernoeia michaeli Engl, 2001 and the bivalves Bathyarca sp., Myonera aff. ruginosa (Jeffreys, 1882 are recorded for the first time in Brazilian waters. This paper presents a brief description of these species and also include ilustrations.

  3. Primer registro de Dondice parguerensis (Mollusca: Favorinidae) para Venezuela / First record of Dondice parguerensis (Mollusca: Favorinidae) in Venezuela

    Scientific Electronic Library Online (English)

    Joany, Mariño; Edixon, Farfán; Manuel, Caballer.

    2011-06-01

    Full Text Available Se cita por primera vez para Venezuela el aeolidaceo Dondice parguerensis Brandon y Cutress, 1985, parásito de los cnidarios Cassiopea xamachana Bigelow, 1892 y Cassiopea frondosa (Pallas, 1774), hasta ahora sólo conocido de Puerto Rico, Panamá y Bermudas. [...] Abstract in english The presence of the aeolidacean Dondice parguerensis Brandon and Cutress, 1985, parasite of the cnidaria Cassiopea xamachana Bigelow, 1892 and Cassiopea frondosa (Pallas, 1774) is recorded for the first time in Venezuela. It was previously recorded in Puerto Rico, Panama and Bermuda. [...

  4. Primer registro de Doto chica (Mollusca: Dotidae) en Venezuela / First record of Doto chica (Mollusca: Dotidae) in Venezuela

    Scientific Electronic Library Online (English)

    Roberta, Crescini; William, Villalba; Makcim, De Sisto.

    2013-06-01

    Full Text Available SciELO Mexico | Language: Spanish Abstract in spanish Se cita por primera vez para Venezuela el dótido Doto chica Ev. Marcus y Er. Marcus, 1960 encontrado sobre hojas de Thalassia testudinum. Ha sido citado para Florida, Curaçao, Puerto Rico, Cuba, México y Costa Rica. [...] Abstract in english The presence of Doto chica Ev. Marcus and Er. Marcus, 1960 is recorded for the first time in Venezuela, found on Thalassia testudinum leaves. It has been recorded in Florida, Curaçao Puerto Rico, Cuba, Mexico and Costa Rica. [...

  5. Hermafroditismo Funcional de la Gónada de Fissurella crassa (Mollusca: Fissurellidae) / Functional Hermaphrodite Gonad in Fissurella crassa (Mollusca: Fissurellidae)

    Scientific Electronic Library Online (English)

    Alberto, Olivares Paz; David, Jofré Madariaga; Carlos, Alvarez Mazú; Eduardo, Bustos-Obregón.

    2009-06-01

    Full Text Available SciELO Chile | Language: Spanish Abstract in spanish La costa del Pacífico sudoriental es el hábitat de las 13 especies de lapas descritas del subgénero Fissurella Brugière. En estas especies no existe dimorfismo sexual, los animales son dioicos, el sexo se reconoce explorando directa o indirectamente las gónadas y no tienen procesos de reversión sexu [...] al. La presencia de un organismo de Fissurella crassa con gónada formada por porciones de ovario y otras de testículo con capacidad para generar óvulos y espermatozoides, evidencia la potencialidad que los organismos de Fissurella poseen para desarrollar el hermafroditismo funcional. Sin embargo, el presente hallazgo no permite inferir si el agente desencadenante del desarrollo sincrónico funcional de la gónada hermafrodita es un factor endógeno y/o asociado a algún evento exógeno medio ambiental. Abstract in english The coast of the Southeastern Pacific is the habitat for 13 species of described keyhole limpets of the subgenus Fissurella Brugière. In these species sexual dimorphism does not exist, the animals are dioicos, the sex is recognized exploring directly or indirectly the gonads and they do not have pro [...] cesses of sexual reversion. The presence of an organism Fissurella crassa with portions of ovary and testicle with ability to generate ova and sperms, demonstrates the potential that Fissurella's organisms possess to develop functional hermaphroditism. Nevertheless, the present find does not allow to infer if the trigger agent of the synchronous functional development of the hermaphrodite gonad is a factor endogenous and / or associated with any exogenous environmental event.

  6. Histological Description of Oogenesis in Chiton virgulatus (Mollusca: Polyplacophora) / Descripción Histológica de la Ovogénesis de Chiton virgulatus (Mollusca: Polyplacophora)

    Scientific Electronic Library Online (English)

    Nurenskaya, Vélez-Arellano; Mineko, Shibayama; Esperanza, Ortíz-Ordoñez; Angélica, Silva-Olivares; Marcial, Arellano-Martínez; Federico, García-Domínguez.

    2014-06-01

    Full Text Available SciELO Chile | Language: English Abstract in spanish En el presente trabajo se describe la ovogénesis de Chiton virgulatus, utilizando histología y las técnicas de microscopía electrónica de barrido y de transmisión. Se identificaron tres tipos de ovocitos: i) ovocitos previtelogénicos con un diámetro promedio de 50±20,5 µm, rodeados por células folic [...] ulares de forma alargada y un tamaño de aproximadamente 5 µm, ii) ovocitos vitelogénicos inmaduros con un diámetro promedio de 113±15,3 µm, este tipo de ovocitos presentan pequeñas proyecciones citoplasmáticas, que indican el inicio del desarrollo del casco del ovocito. Adyacentes a cada prolongación se presentan poros con un diámetro aproximado de 0,7 µm y iii) ovocitos vitelogénicos maduros con un diámetro promedio de 146±24,8 µm, las proyecciones citoplasmáticas del casco del ovocito crecen y en su parte apical adquieren la forma de un tridente, las células foliculares, dado el crecimiento de la prolongación toman el aspecto bulboso y llegan a medir hasta 20 µm de longitud. La morfología y la ultraestructura de las proyecciones del casco del ovocito vitelogénico maduro, así como el tamaño del poro en la base de las proyecciones son particulares para C. virgulatus, dichas características podrían ser utilizadas en trabajos de taxonomía y fertilización. Abstract in english This paper describes the oogenesis of Chiton virgulatus, based on histological observations under transmission and scanning electron microscopy. Three oocyte types were identified: i) previtellogenic oocytes with a mean diameter of 50±20.5 µm, surrounded by elongated follicular cells of approximatel [...] y 5 µm, ii) immature vitellogenic oocytes with a mean diameter of 113±15.3 µm and small cytoplasmic projections denoting the onset of the oocyte hull development; adjacent to each projection are pores approximately 0.7 µm in diameter, and iii) mature vitellogenic oocytes with a mean diameter of 146±24.8 µm; the oocyte cytoplasmic projections grow and its apical zone becomes trident-shaped; follicular cells adopt a bulbous shape due to the growth of the elongation and can reach up to 20 µm in length. The morphology and ultrastructure of the projections of the mature vitellogenic oocyte, as well as the size of pores at their base, are specific to C. virgulatus; therefore, these features could be used in taxonomic or fertilization studies.

  7. Diagnóstico pesquero de Chiton articulatus (Mollusca: Polyplacophora) en Acapulco, México / Fisheries diagnostic of Chiton articulatus (Mollusca: Polyplacophora) at Acapulco, Mexico

    Scientific Electronic Library Online (English)

    Sergio, García-Ibáñez; Rafael, Flores-Garza; Pedro, Flores-Rodríguez; Juan, Violante-González; Arcadio, Valdés-González; Francis Giovani, Olea-de la Cruz.

    2013-08-01

    Full Text Available SciELO Chile | Language: Spanish Abstract in spanish Los quitones son moluscos marinos con un gran pie muscular que les permite amoldarse a superficies irregulares. Algunas especies como Chiton articulatus, se utilizan para el consumo humano. Durante abril, julio y diciembre de 2009, 2010 y 2011, se realizó un diagnóstico de su pesca en Acapulco, Méxi [...] co. Se registró la abundancia total de captura, tallas y pesos de ejemplares capturados en pesca artesanal. En octubre y diciembre 2009 así como febrero y abril 2010, se realizaron muestreos biológicos de la especie para analizar relaciones biométricas de la longitud total con la longitud y peso del pie. Se obtuvieron dos modelos para estimar la longitud total. Se registraron 4.007 pies de la especie. Con el modelo lineal se estimaron longitudes del organismo entre 39,75 y 48,27 mm; con el modelo potencial se encontraron entre 43,09 y 54,97 mm. En una escala de tiempo, ambas estimaciones presentaron una tendencia de disminución anual del promedio de longitud. La pesca de C. articulatus puede considerarse como artesanal. La cantidad y tallas de captura se relacionaron con la temporada climática. Ante la falta de una estrategia de manejo sostenido del recurso, la pesca no regulada puede generar cambios poblacionales de la especie y afectar la estructura y dinámica de la comunidad de organismos intermareales. Abstract in english Chitons are marine mollusks morphologically composed of a large muscular foot which allows them to conform to irregular surfaces. Few species as Chiton articulatus are used for human consumption. During April, July and December of 2009, 2010 and 2011, an evaluation was conducted on C. articulatus at [...] Acapulco, Mexico. Number, size and weight of individuals caught in fishing were recorded. Simultaneously, during October and December 2009, February and April 2010, field work was carried at 4 locations to record the amount, size and weight of individuals caught for biometric analysis of the total length versus foot length and foot weight. Two models were obtained to estimate the total length. There were 4,007 C. articulatus feet acquired; the linear model estimated lengths from 39.75 to 48.27 mm; and the potential model calculated lengths from 43.09 to 54.97 mm. On a time scale, both estimates showed a trend of decreasing the annual arithmetic mean captured. The caught of C. articulatus in Acapulco can be considered as coastal artisanal fisheries. Furthermore, the variations in amount and sizes of the specimens were related to capture and weather season. Unregulated fishing effort may impact the population dynamics affecting the community structure and dynamics on the rocky shore.

  8. Primer registro de Favorinus auritulus (Mollusca: Facelinidae) para Venezuela / First record of Favorinus auritulus (Mollusca: Facelinidae) in Venezuela

    Scientific Electronic Library Online (English)

    William, Villalba; Roberta, Crescini.

    1321-13-01

    Full Text Available SciELO Mexico | Language: Spanish Abstract in spanish Se cita por primera vez para Venezuela Favorinus auritulus E. Marcus, 1955, el cual fue encontrado junto a posturas de otros moluscos en parches de la fanerógama marina Thalassia testidunum en la laguna de La Restinga, isla de Margarita, Venezuela. Esta especie ha sido previamente citada para Estado [...] s Unidos (Florida), Bermuda, Bahamas, Cuba (Pinar del Río), Jamaica, Puerto Rico, Antigua, Trinidad y Tobago (Tobago), Curazao y Brasil. Abstract in english Favorinus auritulus E. Marcus, 1955 is recorded for the first time in Venezuela. Specimens were found next of other mollusks eggs species on patches of Thalassia testudinum seagrass in the lagoon La Restinga, Margarita island Venezuela. F. auritulus has been previously recorded in USA (Florida), Ber [...] muda, Bahamas, Cuba (Pinar del Río), Jamaica, Puerto Rico, Antigua, Trinidad y Tobago (Tobago), Curazao and Brazil.

  9. Sessile and sedentary macrofauna from the Pirapama Shipwreck, Pernambuco, Brazil / Macrofauna séssil e sedentária do Naufrágio Pirapama, Pernambuco, Brasil

    Scientific Electronic Library Online (English)

    Simone Maria de Albuquerque, Lira; Cristiane Maria Rocha, Farrapeira; Fernanda Maria Duarte, Amaral; Carla Alecrim Colaço, Ramos.

    2010-12-01

    Full Text Available SciELO Brazil | Language: English Abstract in portuguese Naufrágios são classificados como ambientes recifais artificiais, estruturas imersas em ecossistemas aquáticos (principalmente marinhos) que fornecem abrigo, substratos consolidados, áreas de crescimento, alimentação e de berçário. Este estudo objetivou pesquisar a biodiversidade bentônica animal do [...] Naufrágio Pirapama, localizado a 23 m de profundidade e a seis milhas do Porto de Recife. Entre 2001 e 2007 mergulhos autônomos foram realizados para coletar, observar e fotografar as espécies. No laboratório, o material foi posteriormente classificado e identificado. Um total de 76 táxons foi registrado para a fauna séssil e sedentária, pertencentes aos seguintes filos: Porifera (Demospongiae e Calcarea), Cnidaria (Hydrozoa e Anthozoa), Mollusca (Bivalvia e Gastropoda), Annelida (Polychaeta), Arthropoda (Cirripedia), Bryozoa (Gymnolaemata), Echinodermata (Asteroidea e Echinoidea), e Chordata (Ascidiacea). A maior quantidade de espécies foi de Porifera e Bryozoa, com 13 espécies listadas para cada um. Onze novas ocorrências foram registradas para o Estado de Pernambuco, o hidróide Halopteris polymorpha e dez espécies de briozoários, uma deles sendo o primeiro registro para o Brasil (Scrupocellaria curacaoensis). A biodiversidade do Pirapama foi considerada típica quando comparada com a de outros naufrágios que foram estudados no mundo. Abstract in english Shipwrecks are considered artificial reef environments - structures immersed in aquatic environments (especially marine ones) that provide fauna with shelter, hard substrates, food and nursery areas. This study aimed to survey the benthic animal biodiversity of the Pirapama shipwreck, located 23 m d [...] eep and six miles off Recife harbor. From 2001 to 2007, species were observed, photographed and collected through scuba diving. The material was later sorted and identified in the laboratory. A total of 76 sessile and sedentary animal taxa were recorded belonging to the following phyla: Porifera (Demospongiae and Calcarea), Cnidaria (Hydrozoa and Anthozoa), Mollusca (Bivalvia and Gastropoda), Annelida (Polychaeta), Arthropoda (Cirripedia), Bryozoa (Gymnolaemata), Echinodermata (Asteroidea and Echinoidea), and Chordata (Ascidiacea). The greatest richness was for Porifera and Bryozoa - 13 listed species for each. Eleven new occurrences were recorded for the state of Pernambuco, the hydroid Halopteris polymorpha and ten bryozoan species, one of them being the first record for Brazil (Scrupocellaria curacaoensis). The Pirapama's biodiversity was considered typical when compared to other shipwrecks that have been studied around the world.

  10. Effects of 4-nonylphenol on benthic macroinvertebrates and insect emergence in littoral enclosures

    Energy Technology Data Exchange (ETDEWEB)

    Schmude, K.L.; Liber, K.; Corry, T.D. [Univ. of Wisconsin, Superior, WI (United States). Lake Superior Research Inst.; Stay, F.S. [Environmental Protection Agency, Duluth, MN (United States). Mid-Continent Ecology Div.

    1999-03-01

    The effect of 4-nonylphenol (NP) on benthic, freshwater macroinvertebrates in littoral enclosures was evaluated over a 2-year period. Enclosures received 11 NP applications, 48 h apart, with nominal rates of 3, 30, 100, and 300 {micro}g/L. Mean measured peak concentrations in integrated water column samples over the 20-d application period were 5 {+-} 4, 23 {+-} 11, 76 {+-} 21, and 243 {+-} 41 {micro}g/L NP. Concentrations of NP in the water column decreased rapidly after the last application. Maximum NP concentrations measured in sediments, pore water, and macrophytes of a 300-{micro}g/L enclosure were 27.4 mg/kg, 29.9 {micro}g/L, and 89.6 mg/kg, respectively. The most abundant macroinvertebrate groups, Chironomidae, Oligochaeta, and Mollusca, decreased in abundance after application. Effects on Mollusca were the most severe. Their numbers were significantly reduced at the highest treatment throughout most of the study. Oligochaetes and chironomids were also significantly reduced at the highest treatment, but populations recovered within 6 weeks. Snails and naidid oligochaetes were slightly affected at the second highest treatment (76 {+-} 21 {micro}g/L NP). Insect emergence was reduced during and immediately post-application, but the effects were likely caused or compounded by a surfactant sheen on the surface of the water that interfered with emergence and/or oviposition. The observed effects on the benthic community were most likely due to exposure from the water, although more persistent macrophyte-associated residues may have contributed to effects on Gastropoda, Naididae, and Tanytarsini. Macrophyte-associated NP residues may pose a small risk to benthic organisms, but it is probably minor compared to water exposures. The no-observed and lowest-observed-effect concentration for the benthic community was 23 {+-} 11 and 76 {+-} 21 {micro}g/L NP, respectively.

  11. Feeding pattern and use of reproductive habitat of the Striped toad Rhinella crucifer (Anura: Bufonidae from Southeastern Brazil

    Directory of Open Access Journals (Sweden)

    Rodrigo B. Ferreira

    2009-12-01

    Full Text Available Diet composition, foraging mode, and using of reproductive habitat of Rhinella crucifer was studied in an artificial pond in Espírito Santo, Brazil. The favored substrate was leaf litter, followed by Cyperaceae/Poaceae. Calling sites, preferred for 23.3 % (n = 7 of the observed toads, were within the water, with only the head not submerged. We analyzed a total of 61 specimens, mainly males (98.5% male and 1.5% female. Seven categories of prey were found in the stomach contents: Coleoptera, Hymenoptera (Formicidae, Isoptera, Lepidoptera, Orthoptera, Gastropoda (Mollusca, Opilionida (Arachnida. Our studies indicate that the diet of Rhinella crucifer consists mainly of terrestrial colonial arthropods. Formicidae was the predominant food item in frequency of occurrence, number of prey and weight. Isoptera and Coleoptera were also relevant in terms of weight. Neither large ontogenetic dietary nor seasonal shifts were observed in the population studied. Our results suggest that no intraspecific food resource partitioning occurs in adult or juveniles. Rhinella crucifer adults avoid competition inhabiting different home range habitats and seem to be ant-specialist with a wide foraging mode.

  12. The influence of trematodes on the macroalgae consumption by the common periwinkle Littorina littorea

    DEFF Research Database (Denmark)

    Clausen, Karin T.; Larsen, Martin H.

    2008-01-01

    Trematodes are ubiquitous elements of coastal ecosystems that commonly modify the phenotype of their invertebrate hosts, often with ramifications to higher levels of ecological organization. In this context, trematode infections have been suggested to reduce the consumption of the herbivorous gastropod Littorina littorea (L.) (Mollusca: Gastropoda), in turn affecting the composition of the macroalgal community on which the snail grazes. Here, we examine the effect of two species of trematodes, Renicola roscovita and Himasthla elongata, on L. littorea's consumption in two outdoor microcosm experiments offering the snails two different ephemeral green algae species as a food source. Our results show that, irrespective of the species of parasite and food source, infection decreases consumption: uninfected snails consumed up to 65% more macroalgal biomass than infected snails. Aside from infection status, gender and size also influenced the snails' consumption rate significantly. The differing histopathological impacts of the two species of trematodes on the hosts' gonad-digestive gland complex (in which the parasites reside), suggests that parasitic castration is a likely mechanism for the reduced energy demand of infected periwinkles. Together with existing evidence, our investigation suggests that trematodes in general depress the grazing activity of L. littorea, and that the resulting community regulation occurs throughout the snails' distributional range.

  13. Ostracoda (Crustacea) association and a new species (Dolerocypris anatolia nov. sp.) from the Pliocene-Pleistocene Af?in-Elbistan (Kahraman Mara?) Coal Basin of Turkey

    Science.gov (United States)

    Tuno?lu, Cemal; Besbelli, Berk; Ertekin, ?brahim Kadri

    2012-04-01

    The Af?in-Elbistan Coal Basin, which is one of the largest and most important Pliocene-Pleistocene lignite basins of Turkey, is located in Eastern Anatolia. The basin was formed between two normal faults having NE-SW direction and these faults controlled both the sedimentation and the subsidence. The coal horizon of over 50 meters in thickness indicates the balance between the sedimentation and subsidence rates, and was preserved during peat deposition. Coals were generated in this extensive and shallow freshwater lake and evolved from the Pliocene to Pleistocene. Typical faunal and floral assemblages of this ancient Af?in-Elbistan freshwater lake are Ostracoda, Mollusca (Gastropoda and Pelecypoda), spore-pollen and Characeae (gyrogonites). Eleven Cypridoidea species were identified from the investigation area. Eight of them are already known (Candona neglecta Sars, Candona iliensis Mandelstam, Candona aff. candida (Müller), Pseudocandona compressa (Koch), Cyclocypris ovum (Jurine), Ilyocypris gibba (Ramdohr), Cypris pubera Müller, Heterocypris salina (Brady)), whereas three belong to open nomenclature — Candona sp. and Eucypris sp.; Dolerocypris anatolia nov. sp. is proposed as a new species. Dolerocypris Kaufmann is one of the largest genera among the freshwater Ostracoda. It has a very wide geographical distribution. Representatives of this genus are actively swimming species found in shallow zones of freshwater lakes and reported from small grassy water bodies with megascopic plants. Dolerocypris anatolia nov. sp. is recorded from core samples of the Pliocene-Pleistocene Af?in-Elbistan Coal Basin for the first time.

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

    Scientific Electronic Library Online (English)

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

    2014-09-01

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

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

    Directory of Open Access Journals (Sweden)

    Ana Maria Leal-Zanchet

    2003-09-01

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

  16. 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)

    A. C. M. Horn

    2005-08-01

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

  17. 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)

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

    2005-08-01

    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.

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

    Scientific Electronic Library Online (English)

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

    2014-03-01

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

  19. Taxonomic review of the genus Adelomelon (Gastropoda; Volutidae), based on type material / Revisão taxonômica do gênero Adelomelon (Gastropoda; Volutidae), com base em material-tipo

    Scientific Electronic Library Online (English)

    F., Wiggers; IL., Veitenheimer-Mendes.

    2008-11-01

    Full Text Available SciELO Brazil | Language: English Abstract in portuguese O gênero Adelomelon Dall, 1906 engloba um grupo de gastrópodes sul-americanos. Apresentamos informações atualizadas sobre o gênero Adelomelon, com ênfase no status e localização do material-tipo, também dos sinônimos juniores. Os táxons Scaphella arnheimi Rivers, 1891 e Voluta paradoxa Lahille, 1895 [...] são removidos da lista sinonímica de Adelomelon ancilla (Lightfoot, 1758) e Adelomelon barattinii Klappenbach and Ureta, 1966 é incluído. Também o subgênero Waveria Clench and Turner, 1954 é colocado na lista sinonímica de Adelomelon s.s. e uma chave para as espécies de Adelomelon é apresentada. Abstract in english The genus Adelomelon Dall, 1906 comprises a group of South American marine gastropods. We present updated information on the genus Adelomelon, with emphasis on the status and location of type material, including that of junior synonyms. Scaphella arnheimi Rivers, 1891 and Voluta paradoxa Lahille, 18 [...] 95 are removed from the synonymy of Adelomelon ancilla (Lightfoot, 1758) and Adelomelon barattinii Klappenbach and Ureta, 1966 is included. The subgenus Weaveria Clench and Turner, 1964 is placed in synonymy with Adelomelon s.s. A key to the species of Adelomelon is provided.

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

    Scientific Electronic Library Online (English)

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

    2009-08-01

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

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

    Directory of Open Access Journals (Sweden)

    Vidal Haddad Junior

    2009-08-01

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

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

    Scientific Electronic Library Online (English)

    Yusuke, Ando.

    2011-08-01

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

  3. Genetical exchanges between one Biomphalaria glabrata (Gastropoda: Planorbidae) and a varying number of partners Trocas genéticas entre uma Biomphalaria glabrata (Gastropoda: Planorbidae) e um número variado de parceiros

    OpenAIRE

    Marc Vianey-Liaud; Jacques Dupouy; Félix Lancastre; Henri Nassi

    1987-01-01

    When one pigmented Biomphalaria glabrata is mated with 1 to 20 albino snails, the percentage of albino parent producing pigmented offspring decreases while the percentage of parent laying albino offspring increases. If the number of snaisl/group increases, the mean duration of the use of allosperm decreases.Quando uma Biomphalaria glabrata pigmentada é posta em presença de um a vinte parceiros albinos, a percentagem de indivíduos parentais que produzem, por fecundação cruzada, uma descen...

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

    Scientific Electronic Library Online (English)

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

    2011-08-01

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

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

    Scientific Electronic Library Online (English)

    Solange Viana Paschoal Blanco, Brandolini; Suzana Bencke, Amato.

    2001-06-01

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

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

    Scientific Electronic Library Online (English)

    W. L., PARAENSE.

    2002-05-01

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

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

    OpenAIRE

    Paraense, W. L.

    2002-01-01

    A redescription of conchological and anatomical characters of the planorbid mollusc Plesiophysa ornata (Haas, 1938) is presented, based on topotypic material and specimens from 14 additional localities in the Brazilian states of Rio Grande do Norte, Paraíba, Sergipe, Bahia, Espírito Santo and Minas Gerais. Due to the close similarity of their shells, a sure discrimination of the five species of Plesiophysa described so far (P. pilsbryi, P. granulata, P. guadeloupensis, P. ornata and P. hube...

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

    Directory of Open Access Journals (Sweden)

    Solange Viana Paschoal Blanco Brandolini

    2001-06-01

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

  9. Evolution of gastropod mitochondrial genome arrangements

    Directory of Open Access Journals (Sweden)

    Zardoya Rafael

    2008-02-01

    Full Text Available Abstract Background Gastropod mitochondrial genomes exhibit an unusually great variety of gene orders compared to other metazoan mitochondrial genome such as e.g those of vertebrates. Hence, gastropod mitochondrial genomes constitute a good model system to study patterns, rates, and mechanisms of mitochondrial genome rearrangement. However, this kind of evolutionary comparative analysis requires a robust phylogenetic framework of the group under study, which has been elusive so far for gastropods in spite of the efforts carried out during the last two decades. Here, we report the complete nucleotide sequence of five mitochondrial genomes of gastropods (Pyramidella dolabrata, Ascobulla fragilis, Siphonaria pectinata, Onchidella celtica, and Myosotella myosotis, and we analyze them together with another ten complete mitochondrial genomes of gastropods currently available in molecular databases in order to reconstruct the phylogenetic relationships among the main lineages of gastropods. Results Comparative analyses with other mollusk mitochondrial genomes allowed us to describe molecular features and general trends in the evolution of mitochondrial genome organization in gastropods. Phylogenetic reconstruction with commonly used methods of phylogenetic inference (ME, MP, ML, BI arrived at a single topology, which was used to reconstruct the evolution of mitochondrial gene rearrangements in the group. Conclusion Four main lineages were identified within gastropods: Caenogastropoda, Vetigastropoda, Patellogastropoda, and Heterobranchia. Caenogastropoda and Vetigastropoda are sister taxa, as well as, Patellogastropoda and Heterobranchia. This result rejects the validity of the derived clade Apogastropoda (Caenogastropoda + Heterobranchia. The position of Patellogastropoda remains unclear likely due to long-branch attraction biases. Within Heterobranchia, the most heterogeneous group of gastropods, neither Euthyneura (because of the inclusion of P. dolabrata nor Pulmonata (polyphyletic nor Opisthobranchia (because of the inclusion S. pectinata were recovered as monophyletic groups. The gene order of the Vetigastropoda might represent the ancestral mitochondrial gene order for Gastropoda and we propose that at least three major rearrangements have taken place in the evolution of gastropods: one in the ancestor of Caenogastropoda, another in the ancestor of Patellogastropoda, and one more in the ancestor of Heterobranchia.

  10. Especies nuevas del género Gibberula (Mollusca: Cystiscidae de Cuba y Venezuela New species of the genus Gibberula (Mollusca: Cystiscidae from Cuba and Venezuela

    Directory of Open Access Journals (Sweden)

    José Espinosa

    2011-03-01

    Full Text Available Se describen 3 especies nuevas de moluscos marinos: Gibberula palmasola sp. n., recolectada en la vegetación asociada a rocas rodeadas de sedimentos blandos en una laguna costera cercada por mangle en la península de Guanahacabibes, Cuba, y caracterizada por presentar, el animal vivo, la cabeza negra y una distribución típica de bandas negras y pardas con lunares anaranjados en el manto bajo la concha; Gibberula dosmosquises sp. n., recolectada en fondos rocosos del Caribe insular de Venezuela, se caracteriza por una discreta coloración del manto y un patrón de manchas en el pie, y Gibberula thetisae sp. n, proveniente de los pastos marinos del golfo de Batabanó, Cuba, con 3 pliegues en la columela, el último muy débil, y un labio externo casi cortante, caracteres que permiten separarla de todas las demás especies conocidas en el área antillana, aunque se desconozca la anatomía del animal. Se discute la lista de especies válidas del género para Cuba y Venezuela, y se hacen adiciones y consideraciones al complejo de especies en torno a Gibberula ubitaensis Espinosa y Ortea, 2000.Three new species of marine molluscs are described. Gibberula palmasola new species, collected in vegetation associated with rocks surrounded by soft sediments in a coastal lagoon surrounded by mangroves in Guanahacabibes Peninsula, Cuba, and characterized by a black head and typical distribution of black and brown bands and orange spots in the mantle. Gibberula dosmosquises new species, collected in rocky bottoms of a Caribbean island from Venezuela, characterized by a simple staining in the mantle and a pattern of spots on the foot, and Gibberula thetisae new species, from sea grass in the gulf of Batabano, Cuba, with shell having 3 columellar folds, the last very weak, and a sharp outer lip; although, its anatomy is not known, these conchological characters separate it from all other known species in the Antilles. Aditionally, the list of valid species for Cuba and Venezuela is discussed and some considerations about Gibberula ubitaensis Espinosa y Ortea, 2000 species complex are given.

  11. Especies nuevas del género Gibberula (Mollusca: Cystiscidae) de Cuba y Venezuela / New species of the genus Gibberula (Mollusca: Cystiscidae) from Cuba and Venezuela

    Scientific Electronic Library Online (English)

    José, Espinosa; Jesús, Ortea; Manuel, Caballer.

    2011-03-01

    Full Text Available Se describen 3 especies nuevas de moluscos marinos: Gibberula palmasola sp. n., recolectada en la vegetación asociada a rocas rodeadas de sedimentos blandos en una laguna costera cercada por mangle en la península de Guanahacabibes, Cuba, y caracterizada por presentar, el animal vivo, la cabeza negr [...] a y una distribución típica de bandas negras y pardas con lunares anaranjados en el manto bajo la concha; Gibberula dosmosquises sp. n., recolectada en fondos rocosos del Caribe insular de Venezuela, se caracteriza por una discreta coloración del manto y un patrón de manchas en el pie, y Gibberula thetisae sp. n, proveniente de los pastos marinos del golfo de Batabanó, Cuba, con 3 pliegues en la columela, el último muy débil, y un labio externo casi cortante, caracteres que permiten separarla de todas las demás especies conocidas en el área antillana, aunque se desconozca la anatomía del animal. Se discute la lista de especies válidas del género para Cuba y Venezuela, y se hacen adiciones y consideraciones al complejo de especies en torno a Gibberula ubitaensis Espinosa y Ortea, 2000. Abstract in english Three new species of marine molluscs are described. Gibberula palmasola new species, collected in vegetation associated with rocks surrounded by soft sediments in a coastal lagoon surrounded by mangroves in Guanahacabibes Peninsula, Cuba, and characterized by a black head and typical distribution of [...] black and brown bands and orange spots in the mantle. Gibberula dosmosquises new species, collected in rocky bottoms of a Caribbean island from Venezuela, characterized by a simple staining in the mantle and a pattern of spots on the foot, and Gibberula thetisae new species, from sea grass in the gulf of Batabano, Cuba, with shell having 3 columellar folds, the last very weak, and a sharp outer lip; although, its anatomy is not known, these conchological characters separate it from all other known species in the Antilles. Aditionally, the list of valid species for Cuba and Venezuela is discussed and some considerations about Gibberula ubitaensis Espinosa y Ortea, 2000 species complex are given.

  12. Viabilidad de espermatozoides criopreservados de macha Mesodesma donacium (Mollusca, Bivalvia Viability of cryopreserved spermatozoa of the surf clam Mesodesma donacium (Mollusca, Bivalvia

    Directory of Open Access Journals (Sweden)

    Enrique Dupré

    2006-11-01

    Full Text Available Se evaluó la viabilidad de los espermatozoides de macha Mesodesma donacium sometidos a diferentes tratamientos de criopreservación mediante su motilidad y éxito de la fecundación con espermatozoides descongelados. En un arreglo factorial se evaluaron 42 protocolos, combinando tres tipos de crioprotectores (DMSO, Metanol y Pro-pilén-glicol, tres concentraciones (0,5 M, 1,0 M y 1,5 M, cuatro tasas de congelación (-5, -10, -15 y -206ºC·min-1 y dos tasas de descongelación (lenta: 72ºC·min-1 y rápida: 312ºC·min-1. Los mejores resultados de motilidad espermática (16,7% se obtuvieron con DMSO 1,0 M como crioprotectante, a una tasa de congelación de -15ºC·min-1y descongelación lenta. Mientras que los mejores resultados de fecundación (84,4% con espermatozoides congelados-descongelados se obtuvieron con DMSO 1,5 M a una tasa de congelación de -15ºC·min-1 y descongelación rápidaThe viability of the surf clam spermatozoa was evaluated using the percentage of fertilization obtained with cryopreserved spermatozoa and different protocols. In total, 42 protocols combined three types of cryoprotectants (DMSO, Methanol, and Prophylen-glycol at three different concentrations (0.5 M, 1.0 M, and 1.5 M, four freezing rates (-5, -10, -15, and -206ºC·min-1, and two thawing rates (slow: 72ºC·min-1 and fast: 312ºC·min-1. The best sperm motility was obtained with DMSO frozen at -15ºC·min-1 and with a slow thawing rate. The best fertilization percentages were obtained with DMSO frozen at -15ºC·min-1 but with a fast thawing rate

  13. Nuevas especies de la familia Marginellidae (Mollusca: Neogastropoda: Muricoidea) de Venezuela / New species of the family Marginellidae (Mollusca: Neogastropoda: Muricoidea) from Venezuela

    Scientific Electronic Library Online (English)

    Manuel, Caballer; José, Espinosa; Jesús, Ortea; Samuel, Narciso.

    2013-04-01

    Full Text Available Hasta la fecha se han citado en Venezuela 10 especies del género Volvarina y una del género Hyalina, aunque de ellas solamente 2 se conocen con certeza. En este trabajo se describen 4 especies nuevas de moluscos de la familia Marginellidae a partir de ejemplares recolectados en 3 localidades diferen [...] tes: la isla de La Tortuga, el Parque Nacional Morrocoy e Isla de Aves. Además, se discute la validez de las citas de Venezuela y la de Caribeginella flormarina Espinosa & Ortea, 1998, sinonimizada con Hyalina pallida. Se aportan ilustraciones de los animales vivos de las 4 especies y también nuevas fotos de la concha del neotipo de H. pallida, depositado en el Museo de Historia Natural de Londres. Las nuevas especies se caracterizan por: Volvarina morrocoyensis Caballer, Espinosa & Ortea especie nueva; 5 bandas pardas en la concha, pliegues paralelos 2 a 2, cuerpo blanco con manchas rojas, manto con manchas negras formando bandas. Volvarina monchoi Caballer, Espinosa & Ortea especie nueva; concha blanca con una banda parda, pliegues desiguales, cuerpo blanco sin manchas. Volvarina avesensis Caballer, Espinosa & Ortea especie nueva; 3 bandas anaranjadas en la concha, pliegues paralelos, cuerpo anaranjado sin manchas, manto con manchas castañas. Hyalina nelsyae especie nueva; 3 bandas pardas en la concha, pliegues posteriores divergentes, anteriores casi paralelos, cuerpo con manchas rojizas formando un diamante en la cola, manto con manchas rojizas en 3 bandas. Abstract in english To date, 10 species of the genus Volvarina and one species of the genus Hyalina have been cited in Venezuela, but only 2 of them are certain. In this paper 4 new species of mollusks of the family Marginellidae are described, based on specimens collected from 3 different locations: La Tortuga Island, [...] Morrocoy National Park and Aves Island. Additionally, the records in Venezuela of all the species of both genus and the validity of Caribeginella flormarina, synonymized with Hyalina pallida, are discussed. Illustrations of the living animals for all the species are included, so as new photos of the shell of the Neotype of H. pallida, housed in the Natural History Museum in London. The new species are characterized by: Volvarina morrocoyensis Caballer, Espinosa & Ortea new species; 5 brownish bands in the shell, paired parallel plications, white body with red spots, mantle with black spots grouped in bands. Volvarina monchoi Caballer, Espinosa & Ortea new species; white shell with a brown band, uneven plications, white body without spots. Volvarina avesensis Caballer, Espinosa & Ortea new species; 3 orange bands in the shell, parallel plications, orange body, lacking spots, mantle with dull spots. Hyalina nelsyae new species; 3 dull bands in the shell, posterior plications divergent, anterior plications quasi-parallel, body with reddish spots forming a diamond in the tail, mantle with reddish spots forming 3 bands.

  14. ESTADO DE LAS POBLACIONES DE QUITONES (MOLLUSCA: POLYPLACOPHORA) EN ROMPEOLAS ARTIFICIALES DE COVEÑAS, SUCRE, COLOMBIA / Populations of quitones (Mollusca: Poliplacophora) in artificial seawalls of Coveñas, Sucre, Colombia

    Scientific Electronic Library Online (English)

    ALCIDES C, SAMPEDRO-M; SANDRA M, PRASCA-S; DANIELA, SUÁREZ-V; LILIBETH, ESCOBAR-S.

    2012-12-01

    Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish El trabajo se realizó en dos rompeolas en Coveñas, Sucre, Colombia. Los objetivos fueron determinar las especies de quitones presentes ahí y su abundancia, distribución espacial, actividad y aspectos morfológicos, así como el papel de los rompeolas en el incremento de la diversidad biológica. Se mid [...] ieron factores abióticos y se anotaron otros organismos presentes. Las especies de quitones que se encuentran en los rompeolas de Coveñas, son las mismas que aparecen en el litoral rocoso de regiones cercanas, como el departamento de Córdoba. Las poblaciones de quitones presentaron una abundancia similar a la encontrada en otras regiones naturales del Caribe. Éstos realizan movimientos nocturnos para alimentarse y regresan a los sitios de reposo diurnos una vez concluyen esa actividad. Sus tallas máximas son mayores que las registradas para otras regiones. La distribución espacial agrupada y la asociación en un mismo microhábitat de las diferentes especies de quitones, aunque obedece a la búsqueda de mejores condiciones alimentarias, en el caso de los rompeolas pudiera estar influenciada además por la estructura de los mismos y por la poca amplitud de las mareas, características de esta región. Los rompeolas permiten la presencia de diversas especies que se relacionan entre sí y que no existían allí con anterioridad, luego incrementan la diversidad biológica. Abstract in english The work was conducted in two artificial seawalls in Coveñas, Sucre, Colombia. The objectives were to determine the species of chitons found in that ecosystem and to establish their abundance, spatial distribution, activity and morphological features. The study also sought to investigate the role of [...] seawalls in increasing local biodiversity. We measured abiotic factors and recorded the organisms present. The species of chitons found in Coveñas seawalls are the same that appear in natural rocky shorelines of nearby regions, such as in the department of Cordoba. The populations of chitons are in similar good condition to those found in other natural regions of the Caribbean. Chitons forage at night and return to their resting sites during the day. Average sizes are larger than those reported for other regions. Abiotic factors measured do not appear to affect the annual variations in the abundance of chitons, which may be more related to tidal changes. The aggregated spatial distribution and association in the same microhabitats of different species of chitons seem to be influenced by the structure of seawalls and the limited tidal range, which are characteristic of this region. Seawalls support various interrelated species and thus increase the local biodiversity.

  15. Faunistics (marine animals) : Porifera, Cnidaria, "Lower" worms, Annelida, "Gephyrea", Crustacea, Arthropoda, Mollusca-1, Mollusca-2, Tentaculata, Echinodermata, Deuterostomia. (About 570 species).

    DEFF Research Database (Denmark)

    These PowerPoint files are compiled from various sources: Internet, field guides, scientific monographs, textbooks, my own photos and drawings, etc. I have no copyright or permission to use most of the illustrations. The file is therefore only intended for internal use within the Marine Biology course. Please, do not put it on Internet or distribute it by any means.     The reason for me to create this file is to facilitate the learning of species. We do not have enough time for field and laboratory work to allow students to learn to know the most important species by that method. We hope that the students will use the files as a preparation before the practicals.     Each slide in the files contain text, references to two books (see below), illustration(s) of a species and the name of that species. You are recommended to run the file in the slide show mode (Slide Show menue: View Show; or press the button (        ) in the lower left corner of the screen). If you do this, the contents of each slide will appear without the species name. Next time the return button is pressed the name will appear. Next time return is pressed, the following species will appear, etc. (Text covering characters for identification have only been included for about a quarter of the species only, because of lack of time).     These files contain information of about 570 species of marine invertebrates found in the waters around Denmark. They should be the most common species. Which species should be selected for files like these? It is a difficult question and it could always be argued that additional species should be included, but I had to define the limit somewhere. I decided to include the species in the two books stated below, plus a few more. The files were made on a Macintosh computer (PowerBook G4) with the programme PowerPoint X for Mac® Service Release 1.     Comments and suggestions are welcome from students and colleagues. HD&P = Køie, Kristiansen & Weitemeyer, Havets dyr og planter. DN = Danmarks Natur, vol. 3, Havet     Tomas Cedhagen, Department of Marine Ecology, University of Aarhus, Finlandsgade 14, DK-8200 Aarhus N, Denmark. Email: cedhagen@biology.au.dk Fysisk medie: CD

  16. Limatula chilensis sp. nov. A new Limidae (Mollusca: Bivalvia) from northern Chile / Limatula chilensis sp. nov. Un nuevo Limidae (Mollusca: Bivalvia) en el norte de Chile

    Scientific Electronic Library Online (English)

    Carla Adriana, Campusano; Paula Mariela, Ruz; Marcelo Enrique, Oliva.

    2012-08-01

    Full Text Available Limatula chilensis sp. nov. se describe en base a la morfología de la concha y tejidos blandos. Los especímenes estudiados se obtuvieron periódicamente entre junio de 2008 y enero de 2009 desde fondos blandos someros submareales en Punta Coloso, norte de Chile, a profundidades entre 22 y 33 m. La mo [...] rfología de la concha es diferente a la de las 4 especies de Limatula descritas para las costas del Pacífico de Sudamerica y Península Antártica (5º-65ºS). Las características más evidentes de L. chilensis fueron el tamaño 3,50 mm (rango 2,36-4,42, DE ± 0,60, n = 34), número de costillas radiales 16-21 (moda = 20, DE = 1,69, n = 8) y una fuerte oblicuidad de la concha. L. chilensis es la única especie conocida del género, para las costas del norte de Chile. Abstract in english Limatula chilensis sp. nov. is described on the basis of shell morphology and soft tissue anatomy. Studied individuals were obtained periodically between June 2008 and January 2009 from sublittoral soft-sediments off Punta Coloso in northern Chile at depths of 22 to 33 m. Shell morphology of the new [...] species differs from the 4 described species of Limatula from the Pacific coast of South America and Antarctic Peninsula (5°-65°S). Main characteristics of L. chilensis include an average height of 3.50 mm (range 2.36-4.42, SD ± 0.60, n = 34), number of radial ribs 16-21 (mode = 20, SD= 1.69, n = 8) and greater shell obliqueness. L. chilensis is the only known species of the genus found off northern Chile.

  17. 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)

    Silvana Carvalho, Thiengo.

    1987-12-01

    Full Text Available 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) present in all females examined.

  18. Kadmium in Valsbaai: moniteringspotensiaal van die mariene slak, Oxystele tigrina (Mollusca Cadmium in False Bay: Monitoring potential of the marine snail, Oxystele tigrina (Mollusca

    Directory of Open Access Journals (Sweden)

    Koot Reinecke

    2009-09-01

    Full Text Available n Opname is onderneem van die kadmiumvlakke in die tussengetygebied van Valsbaai, Suid-Afrika. Kadmiumkonsentrasies is seisoenaal bepaal in die water en sediment in verskillende lokaliteite. Die metings is oor ’n periode van een jaar gedoen deur seisoenaal monsters te versamel by ses verskillende versamelpunte in en een buite die baai. Dit is met behulp van atoom-absorpsiespektrofotometrie ontleed vir kadmium en die hoogste kontaminasievlakke is by die noordelike kusstreek gevind tussen Strand en Muizenberg waar die digsbevolkte gebiede en die eeste industriële aktiwiteit voorkom. Betekenisvolle variasie in konsentrasies van kadmium het seisoenaal en ruimtelik voorgekom. Die gemiddelde konsentrasies in die water en sediment was in sommige gevalle effens hoër as die vlakke wat deur die Suid-Afrikaanse waterkwalitetis-riglyne aanbeveel is. Kadmiumkonsentrasies is ook in versamelde eksemplare van die mariene slak Oxystele tigrina vir verskillende seisoene vir drie lokaliteite bepaal. Laboratoriumeksperimente is uitgevoer om die opname, akkumulasie en verlies van kadmium in verskillende organe van die tussen-getyslak, Oxystele tigrina te ondersoek. Weefselspesi? eke kadmiumkonsentrasies in kontrole- sowel as blootgestelde lewende eksemplare is vergelyk oor ’n blootstellingsperiode van veertien dae. Die eksperimentele slakke is aan twee subletale konsentrasies van onderskeidelik 0.20 en 0.40 µg/ml watergedraagde kadmium in die vorm van CdCl 2 blootgestel. Die proefdiere is gereeld gemonitor en kadmiumkonsentrasies is in verskillende organe, na suurvertering, atoomabsorpsie-spektrofotometries bepaal. Die resultate het ’n algemene toename van kadmium in die liggame van die slakke uitgewys. Kadmium is in variërende konsentrasies in alle weefsel gevind. ’n Ongeveer liniêre patroon van akkumulasie het aangetoon dat die metaal waarskynlik nie deur O. tigrina gereguleer is nie. Die metaal se teenwoordigheid het verskil tussen die sagteweefsel en skulp op so ’n wyse dat die sagteweefsel normaalweg ’n hoër opnamekoers van die kadmium weerspieël het. Nadat die blootgestelde organismes in kadmiumvrye seewater oorgeplaas is, het gedeeltelike kadmiumverlies wel plaasgevind. Die variasie in kadmiumverlies van die verskillende organe dui moontlik daarop dat slegs ’n gedeelte van die geakkumuleerde kadmium sterk gebind was in sekere weefsels of organe. Die behoud van kadmium in beide sediment en diereliggame was sodanig dat afgelei kan word dat kadmium teen huidige omgewingskonsentrasies in sekere dele van Valsbaai, wat algemeen as laag beskou word, steeds met verloop van tyd in hierdie tussengetydiere kan akkumuleer tot vlakke wat nadelig is vir die spesies self, maar ook vir hulle redatore. Dit sal veral kan gebeur indien ? siese toestande verander om die biobeskikbaarheid te verhoog.Cadmium contamination levels in the False Bay intertidal zone in South Africa were assessed in the water and sediments over a period of one year. Samples were collected seasonally from six sites within the bay, and from a reference site situated just outside the eastern arm of False Bay in order to obtain a general overview of contamination levels to which invertebrates in the coastal areas are exposed. The results from the chemical analyses of water and sediment samples revealed that most contamination was associated with the northern shore of the bay between Strand and Muizenberg, where the most populated and industrialised catchments occur. The high contamination factors calculated for Cd for sediments from some sites suggested a strong input of industrial and other discharges containing this heavy metal. There were signi? cant seasonal and spatial differences in the cadmium concentrations, with spatial variations indicating localised contamination, while seasonal variations were assumed to be predominantly related to changes in precipitation and runoff at different times of the year. The mean cadmium concentrations in the water and sediments were occasionally higher than the levels recommended by the South Afr

  19. Cellular biomarker responses of limpets (Mollusca as measure of sensitivity to cadmiumcontamination Sellulêre biomerkerresponse as maatstaf van gevoeligheid van klipmossels (Mollusca vir kadmiumbesoedeling

    Directory of Open Access Journals (Sweden)

    Koot Reinecke

    2008-09-01

    Full Text Available Due to the availability and chemical nature of some heavy metals, sub-lethal toxicant levels may persist in the ocean waters and may cause physiological problems and toxicity in invertebrates and other marine organisms. Although studies of metal concentrations in False Bay showed relatively low mean concentrations of Cd, invertebrates such as molluscs, crustaceans and many other groups are able to accumulate high levels of heavy metals in their tissues and still survive in the heaviest polluted areas. They can accumulate numerous pollutants from natural waters in quantities that are many orders of magnitude higher than background levels. Bioaccumulation ofcadmium in intertidal species could cause stress which may be measurable at the cellular level. A variety of limpet species that may serve as suitable ecotoxicological monitoring species occur in abundance on rocky shores along the South African coastline. The aim of this study was to obtain sensitivity data which could contribute to the selection of a suitable monitoring species and the eventual establishment of a species sensitivity distribution model (SSD with a biomarker responseas endpoint. The limpets Cymbula oculus, Scutellastra longicosta, Cymbula granatina and Scutellastragranularis as well as water samples were collected at two localities in False Bay, South Africa. Analysis of water and biological samples were done by atomic absorption spectrometry. Exposures were done to three different sublethal concentrations of cadmium in the laboratory in static flow tanks over three days. There was a moderate increase in cadmium body concentrations over time. Results obtained at three exposure concentrations showed no significant differences in metal concentrations between the different C. oculus samples. Significant differences were obtained between the control and the exposure groups for each exposure time except between the control and the 1mg/L CdCl2 exposure group after 24 and 72 hours of exposure. Cd body concentrations(soft tissue varied between 4.56 and 21.41µg/g (wet mass.Mean Cd concentrations in soft tissue of S. longicosta was considerably lower (varying between 1.18 and 19.58 µg/g Cd than in the tissues of C. oculus. The control group differed significantly from the 0.8 and 1 mg/L CdCl2 exposures after 48 and 72 hours. Mean Cd body concentrations in S. granular is were the highest of all exposed species, reaching a level of 148 µg/g Cd at the highest exposure concentration and differed significantly from the means of the other samples of the 0.8 mg/L CdCl2 exposure group after 72 hours and from the 1 mg/L CdCl2 group after 24 hours. Significant differences were also obtained between theCd body concentrations of C. granatina for the three exposure concentrations and three exposure times. Lysosomal membrane integrity was determined for both exposed and control animals, using the neutral red retention assay. Three of the four species showed a significant decrease in retention times with an increase in Cd concentration. Inter-species differences in sensitivity to environmentally relevant cadmium concentrations were reflected in the biomarker responses. Based on reduction of NRR times, the order of relative sensitivity to cadmium was S. granularis >C. oculus> S. longicosta.> C.granatina. Die bioakkumulasie van kadmium in tussengetyspesies kan stres veroorsaak wat op sellulêre vlakmeetbaar is. Verskeie klipmosselspesies kom volop op rotse aan die Suid-Afrikaanse kuslyn vooren kan moontlik vir ekotokiskologiese monitering gebruik word. Die oogmerk van die studie wasom sensitiwiteitsdata te verkry wat kan bydrae tot die kies van ’n geskikte spesie vir monitering endie uiteindelike daarstelling van ’n model vir spesie sensitiwiteitsverspreiding (SSV wat ’nbiomerkerrespons as eindpunt gebruik. Die klipmossels Cymbula oculus, Scutellastra longicosta,Cymbula granatina en Scutellastra granularis en watermonsters is in Valsbaai versamel. Analisesvan kadmium in water en biologiese monsters is met behulp van atoomabsorpsiespektrofotometrieuit

  20. Microscopic Anatomy of the Male Reproductive System in Echinolittorina peruviana (Mollusca: Caenogastropoda Anatomía Microscópica del Sistema Reproductor Masculino de Echinolittorina peruviana (Mollusca: Caenogastropoda

    Directory of Open Access Journals (Sweden)

    Viviana M Castillo

    2008-06-01

    Full Text Available Echinolittorina peruviana (Lamarck, 1822, a gonochoric representative of the Littorinidae on the SE Pacific coast, has a male reproductive system adapted for internal fertilization. We describe this system at both macro- and microscopic levéis, particularly the compartmentalized organization of the gonad, and the morphology of the penis. The male reproductive system has a variegated conical gonad-digestive gland complex. The gonad presents three compartments, 1 gametogenic acinar among the glandular acini, 2 periacinar with a layer of fusiform somatic cells and, 3 interacinar with glycogen storage cells shared with glandular acini. Spermatogenesis occurs within the acinar gametogenic compartment, with the germinal line organized in centripetal form towards the lumen. The seminal vesicle stores the products of spermatogenesis; in its cephalic region the euspermatozoa are united to the epithelium and the paraspermatozoa are distributed in the lumen. A short duct connects the seminal vesicle to the prostate gland that is open to the pallial cavity over its entire length. The anterior zone of the prostate gland is joined to the cervical spermatic groove that runs along the neck of the snail through the right pallial region ; this continúes as the penile spermatic groove, ascending from the base to the point of the penis. The penis is acutely conical and unpigmented; towards the anterior and adjacent to its base there is a glandular complex with a mamilliform process and a discoidal glandular region . The secretion from the discoidal region is transformed in a spicule of unknown function, whose histology is described here for the first time. The mamilliform process is formed by the spicular projection and a connective-muscle tissue band which surrounds it and separates it from the discoidal follicular glandular region ; the follicular secretion crosses this band and is incorporated into the epithelium which lines the interior of the process.Echinolittorina peruviana (Lamarck, 1822, representante gonocórico de Littorinidae en el Pacífico Sur, tiene un sistema reproductor masculino adaptado para la fecundacion interna, que en este estudio se describe a niveles macrocoscópico y microscópico; enfatizando la organizacion compartimentalizada de la gónada y la morfología del pene. El sistema reproductor masculino se presenta como un complejo cónico gónada-glándula digestiva abigarrado. La gónada presenta tres compartimientos: 1 gametogénico acinar entre los acinos glandulares, 2 periacinar con una capa de células somáticas fusiformes y 3 interacinar con células almacenadoras de glicógeno, compartido con los acinos glandulares. En el compartimiento gametogénico acinar ocurre la espermatogénesis con la línea germinal organizada en forma centrípeta hacia el lumen. Hacia anterior, la vesícula seminal almacena los productos de la espermatogénesis; en su region cefálica los euespermatozoides se unen al epitelio y los paraespermatozoides se distribuyen en el lumen. Este órgano se conecta con un conducto corto a la glándula prostática, abierta hacia la cavidad paleal en toda su longitud. La zona anterior de la glándula prostática se une al surco espermático cervical, que recorre el cuello del animal por la region paleal derecha; éste continúa como surco espermático peniano ascendiendo desde su base hasta la punta. El pene es cónico aguzado no pigmentado; hacia anterior adyacente a su base, hay un complejo glandular con un proceso mamiliforme y una region glandular discoidal. Su producto de secrecion sería una espícula de funcion desconocida, cuya histología es descrita por primera vez. En este complejo glandular, el proceso mamiliforme está constituido por la proyección espicular y una banda conjuntivo-muscular que lo rodea y separa de la region glandular folicular discoidal; su secrecion atraviesa dicha banda, incorporándose al epitelio de revestimiento interno del proceso.

  1. Viabilidad de espermatozoides criopreservados de macha Mesodesma donacium (Mollusca, Bivalvia) / Viability of cryopreserved spermatozoa of the surf clam Mesodesma donacium (Mollusca, Bivalvia)

    Scientific Electronic Library Online (English)

    Enrique, Dupré; Roberto, Joo.

    2006-11-01

    Full Text Available Se evaluó la viabilidad de los espermatozoides de macha Mesodesma donacium sometidos a diferentes tratamientos de criopreservación mediante su motilidad y éxito de la fecundación con espermatozoides descongelados. En un arreglo factorial se evaluaron 42 protocolos, combinando tres tipos de crioprote [...] ctores (DMSO, Metanol y Pro-pilén-glicol), tres concentraciones (0,5 M, 1,0 M y 1,5 M), cuatro tasas de congelación (-5, -10, -15 y -206ºC·min-1) y dos tasas de descongelación (lenta: 72ºC·min-1 y rápida: 312ºC·min-1). Los mejores resultados de motilidad espermática (16,7%) se obtuvieron con DMSO 1,0 M como crioprotectante, a una tasa de congelación de -15ºC·min-1y descongelación lenta. Mientras que los mejores resultados de fecundación (84,4%) con espermatozoides congelados-descongelados se obtuvieron con DMSO 1,5 M a una tasa de congelación de -15ºC·min-1 y descongelación rápida Abstract in english The viability of the surf clam spermatozoa was evaluated using the percentage of fertilization obtained with cryopreserved spermatozoa and different protocols. In total, 42 protocols combined three types of cryoprotectants (DMSO, Methanol, and Prophylen-glycol) at three different concentrations (0.5 [...] M, 1.0 M, and 1.5 M), four freezing rates (-5, -10, -15, and -206ºC·min-1), and two thawing rates (slow: 72ºC·min-1 and fast: 312ºC·min-1). The best sperm motility was obtained with DMSO frozen at -15ºC·min-1 and with a slow thawing rate. The best fertilization percentages were obtained with DMSO frozen at -15ºC·min-1 but with a fast thawing rate

  2. Microscopic Anatomy of the Male Reproductive System in Echinolittorina peruviana (Mollusca: Caenogastropoda) / Anatomía Microscópica del Sistema Reproductor Masculino de Echinolittorina peruviana (Mollusca: Caenogastropoda)

    Scientific Electronic Library Online (English)

    Viviana M, Castillo; Donald I, Brown.

    2008-06-01

    Full Text Available Echinolittorina peruviana (Lamarck, 1822), representante gonocórico de Littorinidae en el Pacífico Sur, tiene un sistema reproductor masculino adaptado para la fecundacion interna, que en este estudio se describe a niveles macrocoscópico y microscópico; enfatizando la organizacion compartimentalizad [...] a de la gónada y la morfología del pene. El sistema reproductor masculino se presenta como un complejo cónico gónada-glándula digestiva abigarrado. La gónada presenta tres compartimientos: 1) gametogénico acinar entre los acinos glandulares, 2) periacinar con una capa de células somáticas fusiformes y 3) interacinar con células almacenadoras de glicógeno, compartido con los acinos glandulares. En el compartimiento gametogénico acinar ocurre la espermatogénesis con la línea germinal organizada en forma centrípeta hacia el lumen. Hacia anterior, la vesícula seminal almacena los productos de la espermatogénesis; en su region cefálica los euespermatozoides se unen al epitelio y los paraespermatozoides se distribuyen en el lumen. Este órgano se conecta con un conducto corto a la glándula prostática, abierta hacia la cavidad paleal en toda su longitud. La zona anterior de la glándula prostática se une al surco espermático cervical, que recorre el cuello del animal por la region paleal derecha; éste continúa como surco espermático peniano ascendiendo desde su base hasta la punta. El pene es cónico aguzado no pigmentado; hacia anterior adyacente a su base, hay un complejo glandular con un proceso mamiliforme y una region glandular discoidal. Su producto de secrecion sería una espícula de funcion desconocida, cuya histología es descrita por primera vez. En este complejo glandular, el proceso mamiliforme está constituido por la proyección espicular y una banda conjuntivo-muscular que lo rodea y separa de la region glandular folicular discoidal; su secrecion atraviesa dicha banda, incorporándose al epitelio de revestimiento interno del proceso. Abstract in english Echinolittorina peruviana (Lamarck, 1822), a gonochoric representative of the Littorinidae on the SE Pacific coast, has a male reproductive system adapted for internal fertilization. We describe this system at both macro- and microscopic levéis, particularly the compartmentalized organization of the [...] gonad, and the morphology of the penis. The male reproductive system has a variegated conical gonad-digestive gland complex. The gonad presents three compartments, 1) gametogenic acinar among the glandular acini, 2) periacinar with a layer of fusiform somatic cells and, 3) interacinar with glycogen storage cells shared with glandular acini. Spermatogenesis occurs within the acinar gametogenic compartment, with the germinal line organized in centripetal form towards the lumen. The seminal vesicle stores the products of spermatogenesis; in its cephalic region the euspermatozoa are united to the epithelium and the paraspermatozoa are distributed in the lumen. A short duct connects the seminal vesicle to the prostate gland that is open to the pallial cavity over its entire length. The anterior zone of the prostate gland is joined to the cervical spermatic groove that runs along the neck of the snail through the right pallial region ; this continúes as the penile spermatic groove, ascending from the base to the point of the penis. The penis is acutely conical and unpigmented; towards the anterior and adjacent to its base there is a glandular complex with a mamilliform process and a discoidal glandular region . The secretion from the discoidal region is transformed in a spicule of unknown function, whose histology is described here for the first time. The mamilliform process is formed by the spicular projection and a connective-muscle tissue band which surrounds it and separates it from the discoidal follicular glandular region ; the follicular secretion crosses this band and is incorporated into the epithelium which lines the interior of the process.

  3. CEFALÓPODOS (MOLLUSCA: CEPHALOPODA) DEL TALUD SUPERIOR DEL CARIBE COLOMBIANO / CEPHALOPODS SPECIES (MOLLUSCA: CEPHALOPODA) IN THE UPPER SHELF SLOPE OF THE COLOMBIAN CARIBBEAN

    Scientific Electronic Library Online (English)

    Adriana, Gracia C; Néstor, Ardila E; Juan M, Díaz.

    2002-12-01

    Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish Siete especies de cefalópodos de aguas profundas fueron identificadas entre el material colectado en cuatro cruceros exploratorios realizados durante 1998 y 1999, a lo largo del talud superior del Caribe colombiano, entre 200 y 500 m de profundidad. Semirossia tenera, S. equalis, Heteroteuthis dispa [...] r, Opisthoteuthis agassizii, Octopus burryi y Benthoctopus oregonae son registradas por primera vez para el área. S. tenera fue la especie más común, acumulando el 75% de la abundancia total. Abstract in english Seven cephalopod species were identified from material collected during four exploratory cruises carried out in 1998 and 1999 along the upper shelf slope of the Colombian Caribbean at depths between 200 and 500 m. Semirossia tenera, S. equalis, Heteroteuthis dispar, Opisthoteuthis agassizii, Benthoc [...] topus oregonae and Octopus burryi are first recorded for the area. S. tenera was the most common species, representing 75% of the total abundance.

  4. Hermaphroditism among dioecious Tagelus plebeius (Lightfoot, 1786) (Mollusca, Psammobiidae) and Iphigenia brasiliana (Lamarck, 1818) (Mollusca, Donacidae) on the Cachoeira River estuary, Ilhéus, Bahia, Brazil.

    Science.gov (United States)

    Ceuta, L O; Boehs, G; Santos, J J B

    2010-02-01

    The samples of Tagelus plebeius and Iphigenia brasiliana were manually collected on the Cachoeira River estuary region (Ilhéus, BA, Brazil) between August 2005 and August 2006, with a periodicity of 15 days, with 20 animals collected/sampled, performing 500 samples from each species. The animals were measured, eviscerated and kept in solution of Davidson and after 24-30 hours, they were transferred to ethanol 70%. The material was processed for routine histology, with paraffin embedding, obtaining 7 microm thick slices, stained with Harris hematoxilin and Eosin (HE). By light microscopy analysis, 2 cases of hermaphroditism (0.4%) in T. plebeius samples and one case (0.2%) in I. brasiliana were registered with predominance of female over male follicles. PMID:20231968

  5. Cholinesterase activities as potential biomarkers: characterization in two freshwater snails, Potamopyrgus antipodarum (Mollusca, Hydrobiidae, Smith 1889) and Valvata piscinalis (Mollusca, Valvatidae, Müller 1774)

    OpenAIRE

    Gagnaire, B.; Geffard, O.; Xuereb, B.; Margoum, C.; Garric, J.

    2008-01-01

    Anticholinesterase insecticides constitute a major portion of modern synthetic pesticides and the assessment of cholinesterase (ChE) inhibition is widely used as a specific biomarker for evaluating the exposure of non-target organisms to these pollutants. However, most studies on this biomarker were developed on vertebrates and among invertebrates, gastropod mollusks are rarely used. However, gastropods are important members of aquatic habitats and therefore present a high ecological relevanc...

  6. MYTELLA CHARRUANA (D'ORBIGNY) (MOLLUSCA: BIVALVIA: MYTILIDAE) EN LA BAHÍA DE CARTAGENA, COLOMBIA / MYTELLA CHARRUANA (D'ORBIGNY) (MOLLUSCA: BIVALVIA: MYTILIDAE) IN CARTAGENA BAY, COLOMBIA

    Scientific Electronic Library Online (English)

    Mónica, Puyana; Julián, Prato; Juan Manuel, Díaz.

    2012-06-01

    Full Text Available SciELO Colombia | Language: Spanish Abstract in spanish [...] Abstract in english High densities of the bivalve Mytella charruana were found for the first time in the Bay of Cartagena, Colombian Caribbean, during an antifouling field assay carried out during the second semester of 2008. This species reached average densities of 13400 individuals m-2 on underwater manmade substrat [...] es. Size range was between 0.5 and 3.6 cm with an average length of 1.95 cm. Mytella charruana is an avid surface colonizer, monopolizes underwater substrates and reaches cover areas close to 100 % generally as an epibiont.

  7. Development and reproduction in Bulimulus tenuissimus (Mollusca: Bulimulidae) in laboratory / Padrão de desenvolvimento e aspectos reprodutivos de Bulimulus tenuissimus (Mollusca: Bulimulidae) em condições de laboratório

    Scientific Electronic Library Online (English)

    Lidiane C., Silva; Liliane M. O., Meireles; Flávia O., Junqueira; Elisabeth C. A., Bessa.

    2008-06-01

    Full Text Available SciELO Brazil | Language: English Abstract in portuguese Apesar de ser uma espécie de importância parasitológica, não existem estudos sobre a biologia de Bulimulus tenuissimus (d'Orbigny, 1835). O objetivo desse trabalho foi verificar o padrão de crescimento e aspectos reprodutivos dessa espécie em laboratório. Assim, 70 animais recém-eclodidos foram dist [...] ribuídos em sete grupos, com 10 moluscos cada, por um período de dois anos. Para estes animais foi verificado o padrão de crescimento. A ocorrência de autofecundação foi observada através do isolamento de 73 animais. Por não ter sido verificado autofecundação em um período de 180 dias, 30 animais que estavam em isolamento foram pareados de modo a confirmar a fertilidade destes. Registrou-se o tempo para início da oviposição, número de ovos e de posturas, intervalo entre posturas e taxa de eclosão. Foi verificado um padrão de crescimento indeterminado para a espécie. Os animais mantidos agrupados iniciaram a oviposição mais cedo, produziram mais ovos e apresentaram maior eclodibilidade do que os demais grupos. A espécie é capaz de realizar autofecundação, porém um menor sucesso reprodutivo é obtido nesse processo. Os indivíduos de B. tenuissimus apresentaram um período reprodutivo bem definido que parece ser característico para a espécie. Abstract in english Bulimulus tenuissimus (d'Orbigny, 1835) is a land snail of parasitological importance with a poorly understood biology. The goal of this laboratory study was to determine development and reproductive patterns in B. tenuissimus. Recently hatched individuals in seven groups of 10 were maintained in th [...] e laboratory for two years. To test for self-fertilization, 73 additional individuals were isolated. After 180 days the isolated snails showed no signs of reproduction. Subsequently, 30 of these snails were paired to test fertility. We noted the date and time of egg-laying, the number of eggs produced, the number of egg-layings per individual, the incubation period and hatch success. This species shows indeterminate growth. Individuals that were maintained with others, as compared to isolated individuals, laid eggs sooner, laid more eggs and had a greater hatching success. This species can self-fertilize, however, with lower reproductive success. Bulimulus tenuissimus has a well-defined reproductive period that is apparently characteristic for this species.

  8. Development and reproduction in Bulimulus tenuissimus (Mollusca: Bulimulidae in laboratory Padrão de desenvolvimento e aspectos reprodutivos de Bulimulus tenuissimus (Mollusca: Bulimulidae em condições de laboratório

    Directory of Open Access Journals (Sweden)

    Lidiane C. Silva

    2008-06-01

    Full Text Available Bulimulus tenuissimus (d'Orbigny, 1835 is a land snail of parasitological importance with a poorly understood biology. The goal of this laboratory study was to determine development and reproductive patterns in B. tenuissimus. Recently hatched individuals in seven groups of 10 were maintained in the laboratory for two years. To test for self-fertilization, 73 additional individuals were isolated. After 180 days the isolated snails showed no signs of reproduction. Subsequently, 30 of these snails were paired to test fertility. We noted the date and time of egg-laying, the number of eggs produced, the number of egg-layings per individual, the incubation period and hatch success. This species shows indeterminate growth. Individuals that were maintained with others, as compared to isolated individuals, laid eggs sooner, laid more eggs and had a greater hatching success. This species can self-fertilize, however, with lower reproductive success. Bulimulus tenuissimus has a well-defined reproductive period that is apparently characteristic for this species.Apesar de ser uma espécie de importância parasitológica, não existem estudos sobre a biologia de Bulimulus tenuissimus (d'Orbigny, 1835. O objetivo desse trabalho foi verificar o padrão de crescimento e aspectos reprodutivos dessa espécie em laboratório. Assim, 70 animais recém-eclodidos foram distribuídos em sete grupos, com 10 moluscos cada, por um período de dois anos. Para estes animais foi verificado o padrão de crescimento. A ocorrência de autofecundação foi observada através do isolamento de 73 animais. Por não ter sido verificado autofecundação em um período de 180 dias, 30 animais que estavam em isolamento foram pareados de modo a confirmar a fertilidade destes. Registrou-se o tempo para início da oviposição, número de ovos e de posturas, intervalo entre posturas e taxa de eclosão. Foi verificado um padrão de crescimento indeterminado para a espécie. Os animais mantidos agrupados iniciaram a oviposição mais cedo, produziram mais ovos e apresentaram maior eclodibilidade do que os demais grupos. A espécie é capaz de realizar autofecundação, porém um menor sucesso reprodutivo é obtido nesse processo. Os indivíduos de B. tenuissimus apresentaram um período reprodutivo bem definido que parece ser característico para a espécie.

  9. Gloquídio de Diplodon martensi (lhering (Mollusca, Bivalvia, Hyriidae e seu ciclo parasitário The glochidium of Diplodon martensi (lhering (Mollusca, Bivalvia, Hyriidae and its parasitic cycle

    Directory of Open Access Journals (Sweden)

    Maria Cristina Dreher Mansur

    1999-01-01

    Full Text Available Conchological and anatomical studies of the glochidium of Diplodon martensi (lhering, 1893 were performed on samples collected in a small river, tributary from the Caí River, that belong to the Jacuí River sub-basin in south-eastern Brazil. The parasitic development of the glochidium was observed in laboratory on a small cichlid fish Gymnogeophagus gymnogenys (Hensel, 1870.

  10. Gloquídio de Diplodon martensi (lhering) (Mollusca, Bivalvia, Hyriidae) e seu ciclo parasitário / The glochidium of Diplodon martensi (lhering) (Mollusca, Bivalvia, Hyriidae) and its parasitic cycle

    Scientific Electronic Library Online (English)

    Maria Cristina Dreher, Mansur.

    Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] Abstract in english Conchological and anatomical studies of the glochidium of Diplodon martensi (lhering, 1893) were performed on samples collected in a small river, tributary from the Caí River, that belong to the Jacuí River sub-basin in south-eastern Brazil. The parasitic development of the glochidium was observed i [...] n laboratory on a small cichlid fish Gymnogeophagus gymnogenys (Hensel, 1870).

  11. Avaliação das atividades antimicrobiana, citotóxica, moluscicida e antioxidante de Bromelia antiacantha Bertol. (Bromeliaceae) / Evaluation of antimicrobial, cytotoxic, molluscicidal and antioxidant activities of Bromelia antiacantha Bertol. (Bromeliaceae)

    Scientific Electronic Library Online (English)

    L.M., Manetti; A.F., Turra; O.S., Takemura; T.I.E., Svidzinski; A., Laverde Junior.

    2010-12-01

    Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese A Bromelia antiacantha Bertol. (Bromeliaceae), conhecida como gravatá ou caraguatá, apresenta características medicinais, alimentícias e ornamentais. Neste trabalho foram avaliadas as atividades antifúngica, antibacteriana, citotóxica, moluscicida e antioxidante de extratos alcoólicos das folhas e f [...] rutos desta espécie. Na avaliação da atividade antimicrobiana pelo método de microdiluição os extratos alcoólicos não foram eficientes frente à cepa referência do fungo Candida albicans (ATCC 90028), cepas clínicas de C. albicans e C. glabrata, e frente às bactérias S. aureus (ATCC 6538), P. aeruginosa (ATCC 9027) e E. coli (ATCC 8739). A atividade citotóxica, avaliada pelo bioensaio de toxicidade sobre náuplios de Artemia salina Leach (TAS), foi positiva para ambos extratos, com valores de DL50 variando em torno de 620 µg mL-1 e 360 µg mL-1, para os extratos alcoólicos dos frutos e das folhas, respectivamente. A atividade moluscicida, avaliada frente a caramujos da espécie Biomphalaria glabrata (Molusca, Gastropoda), não mostrou toxicidade aguda para soluções de 400 µg mL-1. As propriedades antioxidantes dos extratos investigadas in vitro mediante o método de DPPH• foram consideradas modestas (~ 35% de inibição na concentração de 1000 µg mL-1). Dentre as atividades biológicas que foram testadas a atividade citotóxica foi a mais pronunciada. Abstract in english Bromelia antiacantha Bertol. (Bromeliaceae), popularly known as "gravatá" or "caraguatá", shows medicinal, nutritional and ornamental properties. In the present study, the alcoholic extracts of leaves and fruits of this species were evaluated for antifungal, antibacterial, cytotoxic, molluscicidal a [...] nd antioxidant activities. The alcoholic extracts evaluated by microdilution method were not efficient against the standard strain of Candida albicans (ATCC 90028), clinical strains of C. albicans and C. glabrata, and S. aureus (ATCC 6538), P. aeruginosa (ATCC 9027) and E. coli (ATCC 8739). The cytotoxic activity evaluated by toxicity bioassay on nauplii of Artemia salina Leach (TAS) was positive for both extracts, with LD50 values ranging around 620 µg mL-1 and 360 µg mL-1 for alcoholic extracts from leaves and fruits, respectively. The molluscicidal activity evaluated against Biomphalaria glabrata (Mollusca, Gastropoda) did not present acute toxicity for 400 µg mL-1 solutions. The antioxidant properties of the extracts investigated in vitro using the DPPH• method were considered modest (~ 35% of inhibition at 1000 µg mL-1). Among the evaluated biological activities, cytotoxic activity was the most marked.

  12. Molecular phylogeny of diploid Bulinus sp. (Gastropoda: Planorbidae) populations in Cameroon crater lakes.

    Science.gov (United States)

    Ndassa, Arouna; Mimpfoundi, Remy; Elizabeth, McClymont

    2007-01-01

    Bulinus sp. (2n=36) is a diploid freshwater snail found in Cameroon crater lakes; it belongs to a group of medically important freshwater snails. Some members (Bulinus truncatus, Bulinus tropicus) of this group had been reported to be involved in the transmission of parasites (Schistosoma sp. and Calicophoron microbothrium) to human and livestock in tropical Africa. Yet, understanding of the evolutionary identity of the diploid snail such as its phylogenetic position and the genetic divergence among populations, remains limited. In this study, we constructed the molecular phylogeny of Bulinus sp. using sequences of mitochondrial cytochrome oxydase subunit 1 (CO-1, 365 nucleotides). Partial sequences of CO-1 were obtained and genetic divergences between populations estimated after the alignment of 365 nucleotides from each studied population. The lack of deep molecular divergences between populations of Bulinus sp. from western Cameroon crater lakes may indicate that they belong to the same lineage; therefore, it implies that diploid B. truncatus/tropicus complex snail-like in Cameroon share a common ancestor. The CO-1 of the three studied populations of Bulinus sp., clustered together with other diploid pan-African representatives of the B. truncatus/tropicus complex, showed little evidence of genetic similarities. PMID:16809073

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

    Directory of Open Access Journals (Sweden)

    PARAENSE W. L.

    2002-01-01

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

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

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    Junhee Lee1

    2012-07-01

    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.

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

    OpenAIRE

    Coelho, Ana R. A.; Calado, Gonc?alo J. P.; Dinis, Maria T.

    2012-01-01

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

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

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    Amina Essawy

    2001-01-01

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

  17. The annual reproductive cycle of the snail Megalobulimus abbreviatus (Bequaert, 1948) (Gastropoda, Pulmonata).

    Science.gov (United States)

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

    2005-08-01

    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. PMID:16341424

  18. General morphology and innervation of the midgut and hindgut of Megalobulimus abbreviatus (Gastropoda, Pulmonata).

    Science.gov (United States)

    Martinez-Pereira, Malcon Andrei; Franceschi, Raphaela da Cunha; Antunes, Graziane de Freitas; Coelho, Bárbara Paranhos; Achaval, Matilde; Zancan, Denise M

    2013-04-01

    We describe the morphology and innervation of the midgut and hindgut of the giant land snail Megalobulimus abbreviatus for the first time. The midgut (stomach and intestine) and hindgut (rectum and anus) are innervated by the subesophageal ganglia, through the gastrointestinal branch (originated from the visceral nerve) and the rectum-anal nerve, respectively. Backfilling through these nerves revealed neuronal bodies, mainly in the right parietal and visceral ganglia. The enteric plexuses of the midgut and hindgut are formed by extensive axonal networks and several neuronal somata arranged in clusters or as isolated cells. The gastrointestinal branch and the rectum-anal nerve directly innervate the enteric plexuses of the intestine and the hindgut, respectively. However, the outer wall of the stomach has a stomatogastric nervous system, which consists of four ganglia: stomatogastric, gastric, cardic, and pyloric. Fibers of the gastrointestinal branch project to these ganglia. Anterograde tracing from stomatogastric system ganglia revealed that the enteric plexus of the stomach is innervated only by these peripheral ganglia. Anterograde tracing of the gastrointestinal branch did not result in labeling in the enteric plexus of the stomach. Therefore, the midgut and hindgut of M. abbreviatus is controlled by an intrinsic innervation, constituted by the submucous and myenteric plexuses, which are innervated directly by neurons from the subesophageal ganglia or indirectly via the stomatogastric nervous system (for the stomach). PMID:23537243

  19. Activity of the mangrove snail Cerithidea decollata (Gastropoda: Potamididae) in a warm temperate South African estuary

    Science.gov (United States)

    Hodgson, Alan N.; Dickens, John

    2012-08-01

    A population of Cerithidea decollata, an intertidal marine gastropod usually found within mangroves, was studied within an area of Juncus kraussii in the upper reaches of the warm temperate Knysna estuary, which is at the southern-most limit of the recorded distribution of this snail. Activity (migratory and homing behaviour, distances travelled during foraging) of the snails was monitored over spring and neap tides in four seasons. Migratory patterns of the snails were affected by season, time of low tide (day vs night), tidal magnitude (spring vs neap) and zonation. In the summer and spring, a greater proportion of snails migrated from J. kraussii leaves onto the mud during the day at spring low tide. During neap tides in these two seasons, most snails did not climb J. kraussii leaves and remained on the mud, which was nearly always exposed. In autumn a few snails only were active and in winter snails were almost completely inactive, probably due to low air temperatures. Snails travelled greater distances on the mud on spring tides, during the diurnal low tides, and in the summer. No snails were found to home to individual J. kraussii leaves; however, homing behaviour was recorded to wooden poles within the Juncus wetland.

  20. Composición de ácidos grasos de los caracoles marinos Phyllonotus pomum y Chicoreus brevifrons (Gastropoda: Muricidae)

    Scientific Electronic Library Online (English)

    Haydelba, D’Armas; Dayanis, Yáñez; Dilia, Reyes; Gabriel, Salazar.

    2010-06-01

    Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish Se comparó el contenido de ácidos grasos en los lípidos totales de los caracoles Phyllonotus pomum y Chicoreus brevifrons, recolectados en tres diferentes épocas del año en Punta Arena, estado Sucre, Venezuela. Las concentraciones lipídicas oscilaron entre 0.87 y 1.85%, correspondiendo el valor míni [...] mo y el máximo a C. brevifrons colectado en lluvia y sequía, respectivamente. La esterificación de los ácidos grasos presentes en estos lípidos seguida de la cromatografía de gases permitió la caracterización y cuantificación de los ácidos grasos. En los lípidos totales de las dos especies, en todas las épocas, se observaron elevadas concentraciones de ácidos grasos insaturados (57.21-70.05%) seguido de los saturados (20.33-31.94%). Entre los ácidos grasos insaturados, predominaron los de tipo poliinsaturados, exceptuándose el extracto lipídico de P. pomum en época de transición donde las grasas monoinsaturadas fueron las mayoritarias (38.95%). Los ácidos grasos que prevalecieron fueron: C14:0, C16:0, C18:0, C20:1, C22:1 ?- 11, C22:1 ?-9, C18:3 ?-3, C20:5 ?-3 y el C22:6 ?-3, siendo este ?ltimo el predominante entre los ?cidos grasos poliinsaturados, presentando porcentajes de distribuci?n comprendidos entre 4.62 y 33.11%. Debido a las altas concentraciones de ácidos grasos poliinsaturados encontradas en ambos caracoles, se recomienda su consumo para la alimentación de los seres humanos. Abstract in english Fatty acids composition of the marine snails Phyllonotus pomum and Chicoreus brevifrons (Muricidae). Muricid species of P. pomum and C. brevifrons are of economic importance in the Caribbean. This study includes a comparative evaluation of fatty acid content in the total lipid composition of Phyllon [...] otus pomum and Chicoreus brevifrons. Snail samples were collected during the rainy, dry and transition seasons, in Punta Arena, Sucre (Venezuela). Total lipids were extracted and the specific fatty acid contents were analyzed by gas chromatography. Lipid concentrations varied between 0.87 and 1.85%, with minimum and maximum values corresponding to C. brevifrons collected during rainy and dry seasons, respectively. In the case of total lipids, a high concentration of unsaturated fatty acids (57.21-70.05%) was observed followed by saturated fatty acids (20.33- 31.94%), during all seasons. The polyunsaturated occurred in higher proportion among the unsaturated fatty acids, except for P. pomum which showed higher proportion of monounsaturated fatty acids (38.95%) during the transition season. The prevailing fatty acids were: C14:0, C16:0, C18:0, C20:1, C22:1 ?-11, C22:1 ?-9, C18:3 ?-3, C20:5 ?-3 and C22:6 ?-3, among which docosahexaenoic acid was the predominant polyunsaturated fatty acid, showing values between 4.62 and 33.11%. The presence of high concentrations of polyunsaturated fatty acids found in P. Pomum and C. brevifrons allow their recommendation for human consumption with appropriate resource utilization. Rev. Biol. Trop. 58 (2): 645-654. Epub 2010 June 02.

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

    Science.gov (United States)

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

    2014-01-01

    Here we present a complete list of all valid species-group taxa of freshwater gastropods reported from Miocene and Pliocene deposits in Europe. The last comparable work dates back to the 1920s and covered about 1,600 names. The extensive literature research underlying the present work revealed considerable changes in the taxonomic and systematic frameworks of Neogene freshwater gastropods and yielded a total number of 2,156 accepted taxa. Each taxon is accompanied by a full citation of its first description; where the information is available, page number and illustration reference are provided. First descriptions available as open-access full-text sources on the web were linked via hyperlink to the first page of the publication. PMID:25152683

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

    Directory of Open Access Journals (Sweden)

    Igor P. Bondarev

    2013-10-01

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

  3. Development and Effects of Schistosoma japonicum (Trematoda) on its Intermediate Host, Oncomelania hupensis (Gastropoda)

    OpenAIRE

    Sulieman, Y.; Pengsakul, T.; Guo, Y.

    2013-01-01

    Background: Trematodes belonging to the genus Schistosoma cause schistosomiasis. The relationship between schistosomes and their intermediate hosts varies among snails. This study investigated the effects of S. japonicum on its snail host, Oncomelania hupensis, and cercarial release rythmicity of S. japoni­cum and the effects of light on it.Methods: : Seven groups of O. hupensis (n = 40 each) were exposed individually to 0 (control), 2, 4, 6, 10, 15, and 20 S. japonicum miracidia. Mortality ...

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

    International Nuclear Information System (INIS)

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

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

    Scientific Electronic Library Online (English)

    Marcos G., Papp; Luiz F.L., Duarte.

    2001-03-01

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

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

    Directory of Open Access Journals (Sweden)

    Marcos G. Papp

    2001-03-01

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

  7. Dual strategy for immune defense in the land snail Cornu aspersum (Gastropoda, Pulmonata).

    Science.gov (United States)

    Russo, Jacqueline; Madec, Luc

    2011-01-01

    Immune defenses have been shown to be heavily involved in the evolution of physiological trade-offs. In this study, we compared the internal defense systems in two subspecies of the land snail Cornu aspersum that exhibit contrasting life-history strategies. The "fast-living" Cornu aspersum subsp. aspersa is widespread throughout the world, especially in ecosystems disturbed by man, whereas natural populations of the giant Cornu aspersum subsp. maxima, characterized by a longer life span, are present only in north Africa. Snails were experimentally challenged with Escherichia coli; the measurements used to assess their internal defense for cell- and humoral-mediated immune responses were bacterial clearance, hemocyte density, reactive oxygen species (ROS) production, and plasma antibacterial activity. Both subspecies showed a similar ability to clear bacteria from their hemolymph; however, they varied in the robustness of different individual immune components. Cornu aspersum aspersa had higher ROS activity than did C. a. maxima and lower plasma bactericidal activity. These results suggest that ecological factors can sculpt the immune response. One interpretation is that shorter life span selects for immune defenses such as ROS that, although effective, can cause long-term damage. Such different immune patterns obviously entail various costs involved in the strong intraspecific variation of life-history trade-offs we previously observed. We also have to consider that such variation might be related to intraspecific differences in the relative strength of resistance and tolerance mechanisms. PMID:21460532

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

    Science.gov (United States)

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

    2008-07-01

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

  9. Update on the distribution and phylogenetics of Biomphalaria (Gastropoda: Planorbidae) populations in Guangdong Province, China.

    Science.gov (United States)

    Attwood, Stephen W; Huo, Guan-Nan; Qiu, Jian-Wen

    2015-01-01

    In 1973 planorbid snails then identified as Biomphalaria straminea were discovered in Hong Kong, China. It was assumed that these snails had been introduced to Hong Kong via the import of tropical fish by air from South America. In 2012 Biomphalaria were found for the first time in Guangdong Province, China. In view of the renewed interest in these invasive snails, a morphological and DNA-sequence based phylogenetic study was undertaken for seven populations of Biomphalaria snails collected in Guangdong. Morphologically and phylogenetically, five of the populations clustered more closely with Biomphalaria kuhniana than with B. straminea. Levels of genetic diversity among the populations were about half those of autochthonous populations in Brazil, the phylogenetic relationships did not correlate with a radiation from any one international port in China, and different lineages appeared associated with different ports. Consequently in explaining the current distribution of the snails, multiple colonization events, each establishing a new local snail population near to maritime international container ports, were considered more likely than the spread of snails from Hong Kong to China. The displacement of B. straminea by B. kuhniana in Guangdong is considered as an explanation for the habitat changes observed among the snails between Hong Kong in the 1980s and the present. The conclusions of the study are that any risk of Schistosoma mansoni transmission in China is more likely to come from parasite importation in the intramolluscan stage, than from transmission by migrant workers from South America or Africa. In addition, although likely to be rare, sporadic outbreaks of imported schistosomiasis (caused by invading infected snails) could be a threat to public health in the vicinity of International container ports (not only in Guangdong Province). Further work is called for to investigate further the presence of B. kuhniana and its potential interactions with B. straminea (the former is thought to be incompatible with S. mansoni), and the responses of Chinese Biomphalaria to potential competitors such as Thiaridae. The current expansion of container ports in Brazil and Venezuela, and the increase in trade with China, is likely to accentuate any current risk of imported schistosomiasis, and surveillance around ports in China, together with further research, are necessary. PMID:24811366

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

    Science.gov (United States)

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

    2012-07-01

    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

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

    OpenAIRE

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

    2012-01-01

    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...

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

    Directory of Open Access Journals (Sweden)

    W Lobato Paraense

    2003-06-01

    Full Text Available A description is given of Physa acuta Draparnaud, 1805, based on topotypic specimens from the Garonne river basin, and additional samples from the environs of the French cities of Montpellier and Perpignan. It proved indistinguishable, in shell and anatomy, from topotypic Physa cubensis Pfeiffer, 1839, thus leading the authors to admit the synonymy of the two nominal species under the older name, P. acuta.

  13. Three morphogenetic waves in early development of Physa acuta (Gastropoda, Pulmonata).

    Science.gov (United States)

    Vela, J A

    1985-10-01

    Evidence is presented that there are three morphogenetic waves in early development of Physa acuta: a) around 24-cell stage, b) at early gastrula, and c) at early trochophore, using a proflavin biological test. These morphogenetic maxima fit very well with three transcriptional maxima. Furthermore, it is shown that proflavin inhibits almost completely the RNA synthesis. PMID:2415261

  14. Multiple unfolding states of glutathione transferase from Physa acuta (Gastropoda [correction of Gastropada]: Physidae).

    Science.gov (United States)

    Abdalla, Abdel-Monem; Hamed, Ragaa R

    2006-02-10

    The equilibrium unfolding of the major Physa acuta glutathione transferase isoenzyme (P. acuta GST(3)) has been performed using guanidinium chloride (GdmCl), urea, and acid denaturation to investigate the unfolding intermediates. Protein transitions were monitored by intrinsic fluorescence. The results indicate that unfolding of P. acuta GST(3) using GdmCl (0-3.0M) is a multistep process, i.e., three intermediates coexist in equilibrium. The first intermediate, a partially dissociated dimer, exists at low GdmCl concentration (approximately at 0.7M). At 1.2M GdmCl, a dimeric intermediate with a compact structure was observed. This intermediate undergoes dissociation into structural monomers at 1.75M of GdmCl. The monomeric intermediate started to be completely unfolding at higher GdmCl concentrations (>1.8M). Unfolding using urea (0-7.0M) and acid-induced structures as well as the fluorescence of 8-anilino-1-naphthalenesulfonate in the presence of different GdmCl concentrations confirmed that the unfolding is a multistep process. At concentrations of GdmCl or urea less than the midpoints or at the midpoint pH (pH 4.2-4.6), the unfolding transition is protein concentration independent and involved a change in the subunit tertiary structure yielding a partially active dimeric intermediate. The binding of glutathione to the enzyme active site stabilizes the native dimeric state. PMID:16380092

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

    Scientific Electronic Library Online (English)

    W Lobato, Paraense; Jean-Pierre, Pointier.

    2003-06-01

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

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

    Science.gov (United States)

    Paraense, W Lobato; Pointier, Jean-Pierre

    2003-06-01

    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. PMID:12937765

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

    Science.gov (United States)

    Zhang, Suping; Zhang, Shuqian

    2014-11-01

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

  18. Oncomelania hupensis (Gastropoda: rissooidea) in eastern China: molecular phylogeny, population structure, and ecology.

    Science.gov (United States)

    Wilke, T; Davis, G M; Cui-E, C; Xiao-Nung, Z; Xiao Peng, Z; Yi, Z; Spolsky, C M

    2000-11-01

    The rissooidean snail genus Oncomelania is of medical interest as various taxa are hosts for the human blood fluke Schistosoma and the lung fluke Paragonimus; because of close co-evolved host-parasite-relationships, snail diversity may reflect parasite diversity. There is a considerable amount of confusion regarding the identity of smooth- and ribbed-shelled populations of Oncomelania hupensis in eastern China. We therefore studied the genetic variation, population structure, phylogenetic relationships and ecology of five smooth- and five ribbed-shelled populations in Hubei, Hunan, Anhui, Zhejiang, and Jiangsu provinces. Based on sequencing data of a fragment of the mitochondrial gene for cytochrome oxidase I from 80 individuals, we found little genetic variability within the ingroup-individuals studied here (average pi=0.01922). Moreover, within the ingroup, smooth-shelled individuals cluster together with ribbed-shelled individuals. We therefore consider all smooth- and ribbed-shelled populations of Oncomelania throughout the lower Yangtze River basin to belong to the subspecies O. hupensis hupensis. Our data indicate that ribbing in O. h. hupensis is associated with the annual floods of the Yangtze River. The greatest haplotype (d(H)) and nucleotide diversities (pi) are found in aggregates of ribbed-shelled snails along areas of the Yangtze River drainage subject to flooding. In areas not affected by flooding, the shells are smooth and genetic diversity decreases significantly. PMID:11080513

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

    Scientific Electronic Library Online (English)

    Jorge L., Ramirez; Rina, Ramírez.

    2013-02-01

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

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

    Science.gov (United States)

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

    2009-01-01

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

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

    OpenAIRE

    Joong-Ki Park; Sang-Hwa Lee

    2014-01-01

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

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

    Science.gov (United States)

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

    2006-01-01

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

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

    Directory of Open Access Journals (Sweden)

    Joong-Ki Park

    2014-01-01

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

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

    International Nuclear Information System (INIS)

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

  5. Terrestrial gastropods of Srebarna Nature Reserve, North-Eastern Bulgaria (Gastropoda).

    Science.gov (United States)

    Dedov, Ivailo; Antonova, Vera

    2015-01-01

    We give the results from the first investigation focused on the land snail fauna in Srebarna Nature Reserve in Bulgaria. A total of 23 localities were studied and 27 species of terrestrial gastropods were found, 23 of which were new observations for the Reserve. PMID:25632262

  6. Dutrochus, a new microdomatid (Gastropoda) genus from the Middle Devonian (Eifelian) of west-central Alaska

    Science.gov (United States)

    Blodgett, R.B.

    1993-01-01

    A new gastropod genus, Dutrochus, is established for members of the family Microdomatidae that are characterized by a reticulate ornament of spiral cords and intersecting, finer collabral threads, with all but one spiral cord being of nearly equal strength, and the single remaining cord being of stronger (nearly twice the order) magnitude and being situated at the periphery. It is represented by the type and only known species, Dutrochus alaskensis n. gen. and sp., from the upper part (lower Eifelian) of the Lower? and Middle Devonian Cheeneetnuk Limestone. The genus is very close and nearly homeomorphic to the Permian microdomatid genus Glyptospira. -from Author

  7. Iron-encrusted diatoms and bacteria epibiotic on Hydrobia ulvae (Gastropoda: Prosobranchia)

    Science.gov (United States)

    Gillan, D. C.; Cadée, G. C.

    2000-02-01

    Rust-coloured shells of the gastropod Hydrobia ulvae collected in the Wadden Sea near Texel and in the Jade Busen were analysed under the scanning electron microscope. Most of the shells were found to be covered with a microbial community encrusted with an iron-rich mineral containing traces of Mn, Mg, Ca and Si (EDAX analysis). The community formed a biofilm including two morphotypes of diatoms identified as Cocconeis placentula and Achnanthes lemmermanni, two morphotypes of slender filamentous bacteria resembling Leucothrix and Flexibacter, aggregates of coccoid cells and large trichomes resembling members of the cyanobacterial orders Pleurocapsales and Stigonematales, respectively. The most frequent microorganisms of the biofilm were diatoms and filamentous bacteria.

  8. Genetic distinctness of three widespread and morphologically variable species of Drupella (Gastropoda, Muricidae)

    Science.gov (United States)

    Johnson, M. S.; Cumming, R. L.

    1995-05-01

    Corallivorous gastropods of the genus Drupella have caused considerable damage to corals at widely separated reefs in the Indo-Pacific. Morphological variability of Drupella species within and between areas has caused taxonomic confusion. To clarify the relationships, we examined allozyme variation at 16 gene loci in samples from Western Australia, Queensland and Japan. Within sites, the species D. cornus, D. rugosa and D. fragum were distinguishable individually by each of 9 to 11 loci, with average genetic identities of about 0.25. The differences extended across sites, whereas the conspecific genetic identities over distances up to 6000 km were 0.86 to 1.00, supporting the view that there are three widespread species of Drupella. Nevertheless, there is much variation within species for allozymes, size, shape and colour.

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

    Scientific Electronic Library Online (English)

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

    2010-10-01

    Full Text Available 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.

  10. Seguenziidae (Gastropoda: Vetigastropoda) from SE Brazil collected by the Marion Dufresne (MD55) expedition .

    Science.gov (United States)

    Salvador, Rodrigo B; Cavallari, Daniel C; Simone, Luiz R L

    2014-01-01

    The present work deals with the vetigastropods of the family Seguenziidae collected by the Marion Dufresne (MD55) expedition in SE Brazil, reporting the occurrence of eight species. The following species have their geographical range extended: Ancistrobasis costulata, Carenzia carinata, Carenzia trispinosa, Hadroconus altus, Seguenzia elegans and Seguenzia formosa. Two new species, Halystina umberlee sp. nov. and Seguenzia triteia sp. nov., are described. PMID:25544464

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

    International Nuclear Information System (INIS)

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

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

    Science.gov (United States)

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

    2006-01-01

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

  13. Distribution and habitat preferences of the genus Biomphalaria (Gastropoda: Planorbidae) in Cuba

    Scientific Electronic Library Online (English)

    Antonio Alejandro, Vázquez Perera; Jorge, Sánchez Noda; Yosvania, Hevia Jiménez.

    2010-02-01

    Full Text Available SciELO Brazil | Language: English Abstract in english A study was carried out to determine the distribution and habitat preferences of several species of the genus Biomphalaria. Samples were taken at 350 freshwater locations in Cuba. Three species of Biomphalaria (Biomphalaria havanensis, Biomphalaria helophila and Biomphalaria pallida) were recorded b [...] ased on their distribution. Of the three species, B. havanensis has the weakest distribution because it was identified in only one locality. The other species, B. helophila and B. pallida, are abundant in rivers and dams and have large populations in Cuba. However, the only species that appears to occur in ecosystems shared with thiarids is B. pallida, possibly due to recent introduction of thiarids, but always in fewer numbers. Here we discuss the possibility of these species to act as intermediary hosts of Schistosoma mansoni in Cuba over the basis of occurrence in natural and anthropic habitats.

  14. Determination of age and growth of Buccinum undatum L. (Gastropoda) off Douglas, Isle of Man

    Science.gov (United States)

    Kideys, A. E.

    1996-09-01

    Age and growth of Buccinum undatum off Douglas (Isle of Man, U.K.) were studied using four independent methods: length-frequency analyses (LFA), operculum analysis (OA), markrecapture experiment (MRE) and laboratory rearing (LR). Within the 16-month period between February 1989 and June 1990, only the January 1990 sample showed histograms allowing possible age group determination. Among the several length frequency analyses applied to this sample, the growth analysis program MIX calculated that Buccinum reaches mean lengths of 28.5, 45.8, 59.9, 71.5 and 81.0 mm at the end of its first, second, third, fourth and fifth year, respectively, with an asymptotic length (L?) of 123.8 mm and Brody growth coefficient (K) of 0.20. Whilst the results from the LFA were supported by those from the OA and the MRE, growth in the laboratory differed; however, this was expected. Both K and L values found in this study are higher than those in two previous studies undertaken for Buccinum in northeastern England and northern France.

  15. A new species of Nassarius (Gastropoda: Nassariidae) from the western Pacific Ocean

    Science.gov (United States)

    Zhang, Suping

    2013-03-01

    This paper describes a new species of Nassarius from the South China Sea, which was recognized when re-sorting the collection of Nassariidae in the Marine Biological Museum, Chinese Academy of Sciences, Qingdao, China. The shells were collected during several investigations, including the National Comprehensive Oceanic Survey in 1958-1959, and the China-Vietnam Co-Investigation on Marine Resource of the Beibu Gulf during 1959-1962. The morphology of the shell and the radula places the new species of Nassarius within the subgenus Zeuxis. It is named Nassarius ( Zeuxis) nanhaiensis sp. nov.

  16. ESR dating of Soma (Manisa, West Anatolia - Turkey) fossil gastropoda shells

    International Nuclear Information System (INIS)

    Electron spin resonance (ESR) spectroscopy technique has been employed to date the aragonitic fresh-water gastropod shells (Melanoides curvicosta) collected from Soma (Manisa) district (West Anatolia) of Turkey. The influence of the annealing temperature and ?-radiation dose on dating signal at g = 2.0016 is investigated. The thermal stability and dose response of the ESR signals were found to be suitable for an age determination using a signal at g = 2.0016. The activation energy (E), frequency factor (s) and mean-lifetime (?) at 15 deg. C of the g = 2.0016 center were calculated to be 1.67 ± 0.01 eV (3.6 ± 0.7) x 1013 s-1 and 2.02 x 108 years, respectively. The ESR signal growth curve on additional ?-irradiation has been best fitted by an exponential saturation function. Based on this model, accumulated dose (AD) value for dating is obtained. We have determined the ESR age of the terrestrial gastropods to be 2.57 ± 0.30 Ma. The results show that the ESR age falls into the Late Pliocene (Romanian) epoch of the geological time scale, which agreed with the paleoecological and paleogeographic distribution and stratigraphic level of the fauna

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

    Science.gov (United States)

    Jørgensen, Aslak

    2002-08-01

    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.

  18. ESR dating of Soma (Manisa, West Anatolia Turkey) fossil gastropoda shells

    Science.gov (United States)

    Engin, Birol; Kapan-Ye?ilyurt, Sevinç; Taner, Güler; Demirta?, Hayrünnisa; Eken, Mahmut

    2006-02-01

    Electron spin resonance (ESR) spectroscopy technique has been employed to date the aragonitic fresh-water gastropod shells ( Melanoides curvicosta) collected from Soma (Manisa) district (West Anatolia) of Turkey. The influence of the annealing temperature and ?-radiation dose on dating signal at g = 2.0016 is investigated. The thermal stability and dose response of the ESR signals were found to be suitable for an age determination using a signal at g = 2.0016. The activation energy ( E), frequency factor ( s) and mean-lifetime ( ?) at 15 °C of the g = 2.0016 center were calculated to be 1.67 ± 0.01 eV, (3.6 ± 0.7) × 10 13 s -1 and 2.02 × 10 8 years, respectively. The ESR signal growth curve on additional ?-irradiation has been best fitted by an exponential saturation function. Based on this model, accumulated dose (AD) value for dating is obtained. We have determined the ESR age of the terrestrial gastropods to be 2.57 ± 0.30 Ma. The results show that the ESR age falls into the Late Pliocene (Romanian) epoch of the geological time scale, which agreed with the paleoecological and paleogeographic distribution and stratigraphic level of the fauna.

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

    Scientific Electronic Library Online (English)

    Daniel, Abbate; Daniel Caracanhas, Cavallari.

    Full Text Available 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).

  20. Synonymy between Lymnaea bogotensis Pilsbry, 1935 and Lymnaea cousini Jousseaume, 1887 (Gastropoda: Lymnaeidae

    Directory of Open Access Journals (Sweden)

    Luz Elena Velásquez

    2006-11-01

    Full Text Available The lymneid snail Lymnaea bogotensis Pilsbry 1935 is synonymized with L. cousini Jousseaume 1887, based on morphological comparisons of the reproductive systems. The shell, renal tube, and reproductive system are described and illustrated from specimens collected in the type locality and the municipality of Paipa, Colombia. Bibliographical records reveal L. columella to be the commonest lymneid in the country. The latter two species can be differentiated based on the morphology of the penial complex.

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

    Directory of Open Access Journals (Sweden)

    W Lobato Paraense

    1994-12-01

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

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

    Scientific Electronic Library Online (English)

    Alexandre Dias, Pimenta.

    2012-10-01

    Full Text Available 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.

  3. TEMPERATURE TOLERANCE OF RED-RIMMED MELANIA MELANOIDES TUBERCUATA, (GASTROPODA: PROSOBRANCHIA: THIARIDAE)

    Science.gov (United States)

    The red-rimmed melania Melanoides tuberculata is an exotic aquatic snail of the family Thiaridae that is spreading across the southern United States and in geothermal waters in several midwestern and northwestern states. In addition to its potential to displace native mollusks it is known to harbor...

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

    Directory of Open Access Journals (Sweden)

    Luboš Beran

    2009-12-01

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

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

    Science.gov (United States)

    O'Dwyer, Katie; Blasco-Costa, Isabel; Poulin, Robert; Faltýnková, Anna

    2014-10-01

    Littorinid snails are one particular group of gastropods identified as important intermediate hosts for a wide range of digenean parasite species, at least throughout the Northern Hemisphere. However nothing is known of trematode species infecting these snails in the Southern Hemisphere. This study is the first attempt at cataloguing the digenean parasites infecting littorinids in New Zealand. Examination of over 5,000 individuals of two species of the genus Austrolittorina Rosewater, A. cincta Quoy & Gaimard and A. antipodum Philippi, from intertidal rocky shores, revealed infections with four digenean species representative of a diverse range of families: Philophthalmidae Looss, 1899, Notocotylidae Lühe, 1909, Renicolidae Dollfus, 1939 and Microphallidae Ward, 1901. This paper provides detailed morphological descriptions of the cercariae and intramolluscan stages of these parasites. Furthermore, partial sequences of the 28S rRNA gene and the mitochondrial gene cytochrome c oxidase subunit 1 (cox1) for varying numbers of isolates of each species were obtained. Phylogenetic analyses were carried out at the superfamily level and along with the morphological data were used to infer the generic affiliation of the species. PMID:25204600

  6. [Inheritance of the background shell color in the snails Littorina obtusata (Gastropoda, Littorinidae)].

    Science.gov (United States)

    2014-10-01

    We investigated in a gastropod mollusk Littorina obtusata (L. obtusata) the inheritance of background shell coloration of the shell, which arises on the basis of three pigments: purple, orange, and yellow. We found that the hypothesis on polyallelic inheritance, as in the genus Cepaea, cannot explain the inheritance of shell color in periwinkles. We demonstrated that a separate genetic system is responsible for incorporation of each pigment into the shell. The composition of these genetic systems includes at least tw genes each in the case of the yellow and purple pigments. Our analysis shows that caution should be applied when extending the results obtained in the studies of the Cepaea genus to the other species of gastropods. PMID:25720250

  7. Systematics of the family Plectopylidae in Vietnam with additional information on Chinese taxa (Gastropoda, Pulmonata, Stylommatophora).

    Science.gov (United States)

    Páll-Gergely, Barna; Hunyadi, András; Ablett, Jonathan; L??ng, Hào V?n; Fred Naggs; Asami, Takahiro

    2015-01-01

    Vietnamese species from the family Plectopylidae are revised based on the type specimens of all known taxa, more than 600 historical non-type museum lots, and almost 200 newly-collected samples. Altogether more than 7000 specimens were investigated. The revision has revealed that species diversity of the Vietnamese Plectopylidae was previously overestimated. Overall, thirteen species names (anterides Gude, 1909, bavayi Gude, 1901, congesta Gude, 1898, fallax Gude, 1909, gouldingi Gude, 1909, hirsuta Möllendorff, 1901, jovia Mabille, 1887, moellendorffi Gude, 1901, persimilis Gude, 1901, pilsbryana Gude, 1901, soror Gude, 1908, tenuis Gude, 1901, verecunda Gude, 1909) were synonymised with other species. In addition to these, Gudeodiscushemmeni sp. n. and Gudeodiscusmessageriraheemi ssp. n. are described from north-western Vietnam. Sixteen species and two subspecies are recognized from Vietnam. The reproductive anatomy of eight taxa is described. Based on anatomical information, Halongella gen. n. is erected to include Plectopylisschlumbergeri and Plectopylisfruhstorferi. Additionally, the genus Gudeodiscus is subdivided into two subgenera (Gudeodiscus and Veludiscus subgen. n.) on the basis of the morphology of the reproductive anatomy and the radula. The Chinese Gudeodiscusphlyariuswerneri Páll-Gergely, 2013 is moved to synonymy of Gudeodiscusphlyarius. A spermatophore was found in the organ situated next to the gametolytic sac in one specimen. This suggests that this organ in the Plectopylidae is a diverticulum. Statistically significant evidence is presented for the presence of calcareous hook-like granules inside the penis being associated with the absence of embryos in the uterus in four genera. This suggests that these probably play a role in mating periods before disappearing when embryos develop. Sicradiscusmansuyi is reported from China for the first time. PMID:25632253

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

    Science.gov (United States)

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

    2006-01-01

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

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

    Scientific Electronic Library Online (English)

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

    2011-08-01

    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

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

    Science.gov (United States)

    Sele?chi, Emilia Dana; Duliu, Octavian G.; Georgescu, Rodica

    2007-04-01

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

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

    Directory of Open Access Journals (Sweden)

    Glöer P.

    2014-01-01

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

  12. Field Evidence of Metal Transfer from Invertebrate Prey to an Intertidal Predator, Thais clavigera (Gastropoda: Muricidae)

    Science.gov (United States)

    Blackmore, G.

    2000-08-01

    The predatory gastropod mollusc Thais clavigera inhabiting two shores within the Cape d'Aguilar Marine Reserve, Hong Kong, had very different diets. On an exposed shore the barnacle Tetraclita squamosa dominated the diet. In contrast, on an adjacent sheltered shore diet was more varied. A variety of molluscs were preyed upon year round and the temporally patchily distributed pulmonate limpet Siphonaria japonica and the barnacle Balanus amphitrite dominated the diet in winter and summer, respectively. This differing feeding ecology over a limited geographical area provided a unique opportunity to study the importance of dietary uptake of cadmium, copper and zinc in an unpolluted environment. Thais clavigera feeding on either barnacles or, mainly, gastropods will receive a significant input of trace metals from such sources. Thais clavigera collected from the exposed shore had higher zinc body concentrations (313±14 ?g g -1) compared to sheltered shore conspecifics (261±11 ?g g -1), attributed here to the higher zinc concentrations in their barnacle prey. Conversely, T. clavigera collected from the sheltered shore had higher copper body concentrations (310±22 ?g g -1) compared to exposed shore conspecifics (183±14 ?g g -1) attributed to the higher proportion of haemocyanin-containing gastropods in the diet. No difference in accumulated T. clavigera body cadmium concentrations were observed in individuals with differing feeding ecologies. Cadmium body concentrations of prey were, however, similar and the route of cadmium uptake in this gastropod, therefore, remains unclear.

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

    Energy Technology Data Exchange (ETDEWEB)

    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

    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.

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

    Scientific Electronic Library Online (English)

    Maurício Romulo, Fernandes; Alexandre Dias, Pimenta.

    2011-12-01

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

  15. A new species of Cerithium (Gastropoda: Cerithiidae) from the South China Sea

    Science.gov (United States)

    Sun, Qimeng; Zhang, Suping

    2014-09-01

    Specimens of a new species of Cerithiidae, Cerithium mangrovum n. sp., were collected during two surveys along the coasts of Hainan and Guangdong Province, China. Usually associated with potamidid snails, this species often occurs in large populations between the mid-high tidal zones in a range of habitats, including mangroves, grass beds, silt, mud, and coral reefs. C. mangrovum n. sp. has a slender and tapering shell and the straight-sided whorl bears three aligned beaded spiral cords. The thick outer lip has a wide posterior sinus. It morphologically resembles C. coralium Kiener, 1841. The shell of C. coralium is usually larger and wider and the spiral cords are not as beaded as in C. mangrovum n. sp. Its radula has a rachidian tooth with a shallow, wide, median basal projection while the rachidian tooth of C. mangrovum n. sp. has a moderately long, median basal projection.

  16. Complete mitochondrial genome of the giant ramshorn snail Marisa cornuarietis (Gastropoda: Ampullariidae).

    Science.gov (United States)

    Wang, Mingling; Qiu, Jian-Wen

    2014-09-26

    Abstract We report the complete mitochondrial genome (mitogenome) of the giant ramshorn snail Marisa cornuarietis, a biocontrol agent of freshwater weeds and snail vectors of schistosomes. The mitogenome is 15,923?bp in length, encoding 13 protein-coding genes, 22 transfer RNAs and 2 ribosomal RNAs. The mitogenome is A+T biased (70.0%), with 28.9% A, 41.1% T, 16.7% G, and 13.3% C. A comparison with Pomacea canaliculata, the other member in the same family (Ampullariidae) with a sequenced mitogenome, shows that the two species have an identical gene order, but their intergenic regions vary substantially in sequence length. The mitogenome data can be used to understand the population genetics of M. cornuarietis, and resolve the phylogenetic relationship of various genera in Ampullariidae. PMID:25259454

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

    Science.gov (United States)

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

    2000-05-01

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

  18. Redescription of Vertigo (Vertigo) nitidula (Mousson, 1876) (Gastropoda: Vertiginidae) from the Caucasus region.

    Science.gov (United States)

    Walther, Frank; Kijashko, Pavel V; Hausdorf, Bernhard

    2014-01-01

    A revision of material of a minute land snail species from the Caucasus region usually named Vertigo (Vertigo) sieversi (Boettger, 1879) (Pilsbry 1919; Schileyko 1984; Sysoev & Schileyko 2005; Egorov 2008; Sysoev & Schileyko 2009), including types of all described varieties revealed that adjustments of the delimitation and the nomenclature of this insufficiently known taxon are necessary. We reinstate the oldest available name, Vertigo (Vertigo) nitidula (Mousson, 1876), for this species, redescribe it, and discuss its distinction from Vertigo (Vertigo) substriata (Jeffreys, 1833) as well as its geographical range. PMID:25544072

  19. The complete mitochondrial genome of Chinese land snail Mastigeulota kiangsinensis (Gastropoda: Pulmonata: Bradybaenidae).

    Science.gov (United States)

    Deng, Pu-Juan; Wang, Wen-Min; Huang, Xiao-Chen; Wu, Xiao-Ping; Xie, Guang-Long; Ouyang, Shan

    2014-09-01

    Abstract Mastigeulota kiangsinensis is an endemic and widespread land snail in China. The complete mitochondrial genome of M. kiangsinensis was first determined using long PCR reactions and primer walking method (accession number KM083123). The genome has a length of 14,029?bp, containing 37 typical mitochondrial genes (13 protein-coding genes, 22 tRNA genes and 2 rRNA genes). The base composition of the whole heavy strand is A 29.48%, T 37.92%, C 14.38% and G 18.22%. Gene order of M. kiangsinensis is identical to Euhadra herklotsi, but gene rearrangements are found compared with other mitochondrial genomes described in Stylommatophora. tRNA(Thr) is located in COIII, which has not been found in other helicoids so far. This new complete mitochondrial genome can be the basic data for further studies on mitogenome comparison, molecular taxonomy and phylogenetic analysis in land snails and Molluscs at large. PMID:25185698

  20. Estimation of the density of Buccinum undatum (Gastropoda) off Douglas, Isle of Man

    Science.gov (United States)

    Kideys, A. E.

    1993-02-01

    The density of the common whelk ( Buccinum undatum L.) off Douglas, Isle of Man, was determined by four methods: (1) pot sampling, (2) diving, (3) mark-recapture experiment, and (4) underwater television. Although the values obtained by these methods were comparable, the last two methods yielded overestimations of Buccinum density. The results from diving survey and from pot sampling showed a good agreement, indicating that pot sampling can be used to determine the density of the common whelk, provided a good estimate of the pot attraction area is available. The range of whelk density between February 1989 and August 1990 resulting from pot sampling was between 0.08 and 0.38 individuals m-2. The temporal fluctuations of the whelk densities are discussed in detail.

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

    International Nuclear Information System (INIS)

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

  2. ESR dating of Soma (Manisa, West Anatolia - Turkey) fossil gastropoda shells

    Energy Technology Data Exchange (ETDEWEB)

    Engin, Birol [Ankara Nuclear Research and Training Center, 06100 Besevler, Ankara (Turkey)]. E-mail: birol_engin65@yahoo.com; Kapan-Yesilyurt, Sevinc [Canakkale Onsekiz Mart University, Department of Geological Engineering, Canakkale (Turkey); Taner, Gueler [Ankara University, Department of Geological Engineering, Tandogan, Ankara (Turkey); Demirtas, Hayruennisa [Ankara Nuclear Research and Training Center, 06100 Besevler, Ankara (Turkey); Eken, Mahmut [Ankara Nuclear Research and Training Center, 06100 Besevler, Ankara (Turkey)

    2006-02-15

    Electron spin resonance (ESR) spectroscopy technique has been employed to date the aragonitic fresh-water gastropod shells (Melanoides curvicosta) collected from Soma (Manisa) district (West Anatolia) of Turkey. The influence of the annealing temperature and {gamma}-radiation dose on dating signal at g = 2.0016 is investigated. The thermal stability and dose response of the ESR signals were found to be suitable for an age determination using a signal at g = 2.0016. The activation energy (E), frequency factor (s) and mean-lifetime ({tau}) at 15 deg. C of the g = 2.0016 center were calculated to be 1.67 {+-} 0.01 eV (3.6 {+-} 0.7) x 10{sup 13} s{sup -1} and 2.02 x 10{sup 8} years, respectively. The ESR signal growth curve on additional {gamma}-irradiation has been best fitted by an exponential saturation function. Based on this model, accumulated dose (AD) value for dating is obtained. We have determined the ESR age of the terrestrial gastropods to be 2.57 {+-} 0.30 Ma. The results show that the ESR age falls into the Late Pliocene (Romanian) epoch of the geological time scale, which agreed with the paleoecological and paleogeographic distribution and stratigraphic level of the fauna.

  3. Recognition of Macluritella ( Gastropoda) from the Upper Cambrian of Missouri and Nevada ( USA).

    Science.gov (United States)

    Yochelson, E.L.; Stinchcomb, B.L.

    1987-01-01

    Open-coiled euomphalacean gastropods have been identified for the first time in the Upper Cambrian Eminence Dolomite of Missouri. These gastropods have a triangular whorl profile and are conspecific with Hyolithes walcotti described from the Upper Cambrian of Nevada. That species is questionably reassigned to the gastropod genus Macluritella, hitherto known only from the Lower Ordovician of Colorado. -Authors Ordovician Colorado

  4. New Indo-Pacific species of the genus Teretia Norman, 1888 (Gastropoda: Raphitomidae).

    Science.gov (United States)

    Morassi, Mauro; Bonfitto, Antonio

    2015-01-01

    Four new species are assigned to the genus Teretia Norman, 1888 in the family Raphitomidae Bellardi, 1875 and herein described: Teretia neocaledonica sp. nov., T. sysoevi sp. nov., T. tongaensis sp. nov. from the southeastern Pacific and Teretia tavianii sp. nov. from the Gulf of Aden. The new species represent the first Indo-Pacific record of a genus previously known in the recent molluscan fauna by only two species from the Atlantic Ocean-Mediterranean Sea and Southern Africa. A possible Tethyan origin for the genus Teretia is suggested.  PMID:25661630

  5. Pan-European phylogeography of the aquatic snail Theodoxus fluviatilis (Gastropoda: Neritidae).

    Science.gov (United States)

    Bunje, Paul M E

    2005-12-01

    Investigating the geographical distribution of genetic lineages within species is critical to our understanding of how species evolve. As many species inhabit large and complex ranges, it is important that phylogeographical research take into account the entire range of widespread species to clarify how myriad extrinsic variables have affected their evolutionary history. Using phylogenetic, nested clade, and mismatch distribution analyses on a portion of the mitochondrial COI gene, I demonstrate that the wide-ranging freshwater snail Theodoxus fluviatilis possesses in parallel many of the phylogeographical patterns seen in less widespread freshwater species of Europe. Fragmentary forces play a major part in structuring the range of this species, with 12 of 14 geographically structured nested clades displaying a distribution consistent with fragmentation or restricted dispersal. Certain regions of southern Europe harbour the majority of genetic diversity (total haplotype diversity, H = 0.87), particularly Italy (H = 0.87) and areas surrounding the Black Sea (H = 0.81). Post-Pleistocene range expansion is pronounced, with the majority of northern European populations (95% of sample sites) having arisen from northern Italian individuals that initially colonized northern Germany. Additionally, two highly divergent haplotype lineages present in northern Germany imply that there were at least two postglacial recolonization routes. Estuaries may also provide a means of dispersal given that no genetic differentiation was found between estuarine populations and neighbouring freshwater populations. Taken together, these data reveal a species with a complex genetic history resulting from the fragmentary effects of European geology as well as continuous and discrete range expansion related to their aquatic biology. PMID:16313596

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

    Scientific Electronic Library Online (English)

    W Lobato, Paraense.

    1994-12-01

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

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

    Directory of Open Access Journals (Sweden)

    Md. Sarwar Jahan

    2001-01-01

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

  8. Revision of the genus Turris (Gastropoda: Conoidea: Turridae) with the description of six new species.

    Science.gov (United States)

    Kilburn, Richard N; Fedosov, Alexander E; Olivera, Baldomero M

    2012-03-22

    The taxonomy of the genus TurrisBatsch, 1789, type genus of the family Turridae, widespread in shallow-water habitats of tropic Indo-Pacific, is revised. A total of 31 species of Turris, are here recognized as valid. New species described: Turris chaldaea, Turris clausifossata, Turris guidopoppei, Turris intercancellata, Turris kantori, T. kathiewayae. Homonym renamed: Turris bipartita nom. nov. for Pleurotoma variegataKiener, 1839 (non Philippi, 1836). New synonymies: Turris ankaramanyensisBozzetti, 2006 = Turris tanyspiraKilburn, 1975; Turris imperfecti, T. nobilis, T. pulchra and T. tornatumRöding, 1798, and Turris assyriaOlivera, Seronay & Fedosov, 2010 = T. babylonia; Turris dollyiOlivera, 2000 = Pleurotoma crispaLamarck, 1816; Turris totiphyllisOlivera, 2000 = Turris hidalgoiVera-Peláez, Vega-Luz & Lozano-Francisco, 2000; Turris kilburniVera-Peláez, Vega-Luz & Lozano-Francisco, 2000 = Turris pagasaOlivera, 2000; Turris (Annulaturris) muniziVera-Peláez, Vega-Luz & Lozano-Francisco, 2000 = Gemmula lululimiOlivera, 2000. Revised status: Turris intricataPowell, 1964, Pleurotoma variegata Kiener, 1839 (non Philippi, 1836) and Pleurotoma yeddoensis Jousseaume, 1883, are regarded as full species (not subspecies of Turris crispa). Neotype designated: For Pleurotoma garnonsiiReeve, 1843, to distinguish it from Turris garnonsii of recent authors, type locality emended to Zanzibar. New combination: Turris orthopleuraKilburn, 1983, is transferred to genus Makiyamaia, family Clavatulidae. PMID:23847408

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

    Directory of Open Access Journals (Sweden)

    Ana R. A. Coelho

    2012-07-01

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

  10. Morphology and histology of the digestive gland of Oxychilus (Drouetia) atlanticus (Morelet & Drouët) (Gastropoda: Pulmonata).

    OpenAIRE

    Lopes, Marco; Rodrigues, Armindo; Marigo?mez, Ionan

    2001-01-01

    Little information exists on the histology of Zonitidae digestive system. This study deals with a detailed characterization of the different types of cells comprising epithelium lining the digestive gland of 0xychilus atlanticus. From light and scanning electron microscope (SEM) studies, three types of differentiated cells can be identified in the digestive gland: digestive cells, excretory cells and calcium cells. Digestive cells are the most numerous, and are present in two forms, one be...

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

    Czech Academy of Sciences Publication Activity Database

    Horsák, M.; Hájek, Michal

    2005-01-01

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

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

    Czech Academy of Sciences Publication Activity Database

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

    2009-01-01

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

  13. Behavior of Biomphalaria glabrata Say, 1818 (Gastropoda: Planorbidae): I. Morphophysiology of the Mantle Cavity

    Scientific Electronic Library Online (English)

    Pedro, Jurberg; Rodolfo A, Cunha; Marcelo Luis, Rodrigues.

    1997-03-01

    Full Text Available Using longitudinal and transverse anatomical sections, we observed that the three cristae of the mantle of Biomphalaria glabrata (renal, rectal and dorsolateral cristae) divide the mantle cavity into three chambers which we designated air or pulmonary chamber, water inflow chamber and water outflow [...] chamber. Using videotape filming, we observed the inflow and outflow of air and water into and from the mantle cavity and we related their probable functions such as flotation, oxygen reservoir and transport, excreta circulation and elimination, water skeleton, and modification of specific weight. To determine whether the air bubble may function as a physical gill in this species we submitted three groups of snails to different systems in which water contained the same level of dissolved oxygen whereas the gas phases were atmospheric air, pure nitrogen or pure oxygen. We observed the following parameters: time of permanence on the surface, time of immersion, and frequency at which the snails reached the surface. These results did not demonstrate a physical gill function; morphological analysis of the mantle cavity indicates this possibility

  14. Behavior of Biomphalaria glabrata Say, 1818 (Gastropoda: Planorbidae: I. Morphophysiology of the Mantle Cavity

    Directory of Open Access Journals (Sweden)

    Pedro Jurberg

    1997-03-01

    Full Text Available Using longitudinal and transverse anatomical sections, we observed that the three cristae of the mantle of Biomphalaria glabrata (renal, rectal and dorsolateral cristae divide the mantle cavity into three chambers which we designated air or pulmonary chamber, water inflow chamber and water outflow chamber. Using videotape filming, we observed the inflow and outflow of air and water into and from the mantle cavity and we related their probable functions such as flotation, oxygen reservoir and transport, excreta circulation and elimination, water skeleton, and modification of specific weight. To determine whether the air bubble may function as a physical gill in this species we submitted three groups of snails to different systems in which water contained the same level of dissolved oxygen whereas the gas phases were atmospheric air, pure nitrogen or pure oxygen. We observed the following parameters: time of permanence on the surface, time of immersion, and frequency at which the snails reached the surface. These results did not demonstrate a physical gill function; morphological analysis of the mantle cavity indicates this possibility

  15. Angiostrongylus costaricensis (Nematoda: Protostrongylidae): migration route in experimental infection of Omalonyx sp. (Gastropoda: Succineidae).

    Science.gov (United States)

    Montresor, Lângia C; Vidigal, Teofânia H D A; Mendonça, Cristiane L G F; Fernandes, André A; de Souza, Karyne N; Carvalho, Omar S; Caputo, Luzia F G; Mota, Ester M; Lenzi, Henrique L

    2008-11-01

    Angiostrongylus costaricensis can infect several mollusks, and its migration route in intermediate hosts has been studied only in Sarasinula marginata. To verify the susceptibility of Omalonyx sp. as an intermediate host of A. costaricensis and to analyze the nematode migration route, individuals were infected with stage 1 larvae. Obtained stage 3 larvae were orally inoculated in mice, and after 30 days, adult worms and stage 1 larvae were recovered, demonstrating Omalonyx susceptibility and suitability to infection. To define the parasite migration routes, specimens of Omalonyx with 30 min, 1 h, 2 h, 4 h, 6 h, 8 h, 2 days, 5 days, 10 days, 12 days, 15 days, 20 days, 21 days, 25 days, 28 days, and 30 days of infection were fixed and serially sectioned. Histological sections were stained with hematoxylin-eosin. The results were compared to those described in S. marginata. Oral and cutaneous infections were noted. After the penetration, larvae were retained, mainly in the fibromuscular tissue, by hemocytes, or they spread to the whole organism through the circulation, following the anatomical structure of the vasculature. The perilarval hemocyte reaction in Omalonyx was more intense until stage 2 larva instar, decreasing in the presence of stage 3 larvae. Differences in some aspects of hemocyte reaction between S. marginata and Omalonyx exemplify interspecific peculiarities in snail response to the same parasite. PMID:18712530

  16. Mudwhelks and mangroves: the evolutionary history of an ecological association (Gastropoda: Potamididae).

    Science.gov (United States)

    Reid, D G; Dyal, P; Lozouet, P; Glaubrecht, M; Williams, S T

    2008-05-01

    Most of the 29 living species of Potamididae show a close association with mangroves. The trees provide the snails with shelter, protection from predators, a solid substrate and sometimes food. Using sequences from three genes (nuclear 18S rRNA and 28S rRNA, mitochondrial COI) we derive a molecular phylogeny and recognize six living genera (Terebralia, Telescopium, Tympanotonos, Cerithidea, Cerithideopsis, Cerithideopsilla). The oldest modern genera (Terebralia, Cerithideopsis) appeared in the Tethyan realm in the Middle Eocene, shortly after the origin of mangrove trees. Whereas most potamidid genera are now restricted to either the Indo-West Pacific (IWP) or to the eastern Pacific plus Atlantic (EPA), sister clades of Cerithideopsis survive in both realms. Based on a reinterpretation of the fossil record (particularly of the monotypic Tympanotonos and extinct Potamides), and parsimonious reconstruction of ancestral habitats, we suggest that the living potamidids are an adaptive radiation that has always been closely associated with mangroves. The specialized tree-climbing groups Cerithidea and Cerithideopsis were independently derived from mud-dwelling ancestors. Cerithideopsilla cingulata (a species complex in the IWP) and 'Potamides' conicus (in the Mediterranean and Indian Ocean) form a single clade within the genus Cerithideopsilla. This refutes the hypothesis that 'P.'conicus is the sole relict of the Tethyan Potamides that has occurred in the Mediterranean region since the Palaeocene. Instead, the phylogeny and fossil record suggest that an ancestor of Cerithideopsilla conica with planktotrophic larvae dispersed from the IWP to the Mediterranean in the Middle Miocene, that its direct development evolved in the Mediterranean during the Pliocene, and that it reinvaded the Indian Ocean during the Plio-Pleistocene. PMID:18359643

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

    Science.gov (United States)

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

    2014-10-01

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

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

    OpenAIRE

    Paraense, W. L.

    2002-01-01

    A redescription of conchological and anatomical characters of the planorbid mollusc Plesiophysa ornata (Haas, 1938) is presented, based on topotypic material and specimens from 14 additional localities in the Brazilian states of Rio Grande do Norte, Paraíba, Sergipe, Bahia, Espírito Santo and Minas Gerais. Due to the close similarity of their shells, a sure discrimination of the five species of Plesiophysa described so far (P. pilsbryi, P. granulata, P. guadeloupensis, P. ornata and P. hube...

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

    Scientific Electronic Library Online (English)

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

    1161-11-01

    Full Text Available 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.

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

    Directory of Open Access Journals (Sweden)

    Russell L Minton

    2010-12-01

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

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

    OpenAIRE

    Minton, Russell L.; Lewis, Elise M.; Bryan Netherland; Hayes, David M.

    2010-01-01

  1. Members of the genus Pisidium C. Pfeiffer (Mollusca: Bivalvia) of the Czech Republic

    International Nuclear Information System (INIS)

    Currently, thirteen species assigned to the genus Pisidium are known from the territory of the Czech Republic. This paper contains a new key to them with original figures of definitive characteristics. The key is supplemented with species descriptions and notes on their ecology and distribution in the Czech Republic. Differences between conchologically similar species and possibilities of misidentification with juvenile specimens of the genera Sphaerium and Musculium are commented on as well. (authors)

  2. The influence of thymol+DMSO on survival, growth and reproduction of Bradybaena similaris (Mollusca: Bradybaenidae)

    OpenAIRE

    Paula Ferreira; Soares, Geraldo L. G.; A?vila, Sthefane D.; Almeida Bessa, Elisabeth C.

    2011-01-01

    Bradybaena similaris (Férussac, 1821), commonly known as the Asian trampsnail, is a terrestrial snail native to Asia, introduced in other regions of the world. In Brazil, populations of this land snail are distributed from the state of Amapá in the North to Rio Grande do Sul in the South. This species acts as an intermediate host for parasites and is a difficult-to-control agricultural pest as well, causing great losses to crops and ornamental plant cultivation. This land snail is easily re...

  3. Using DNA barcoding to differentiate invasive Dreissena species (Mollusca, Bivalvia)

    OpenAIRE

    Marescaux, Jonathan; Doninck, Karine

    2013-01-01

    The zebra mussel (Dreissena polymorpha) and the quagga mussel (Dreissena rostriformis bugensis) are considered as the most competitive invaders in freshwaters of Europe and North America. Although shell characteristics exist to differentiate both species, phenotypic plasticity in the genus Dreissena does not always allow a clear identification. Therefore, the need to find an accurate identification method is essential. DNA barcoding has been proven to be an adequate procedure to discriminate ...

  4. Distribuição vertical de Teredinidae (Mollusca, Bivalvia em Portogallo, Angra dos Reis, Rio de Janeiro, Brasil

    Directory of Open Access Journals (Sweden)

    Maria Júlia Martins Silva

    1988-07-01

    Full Text Available Para estudar a distribuição vertical de Teredinidae em Angras dos Reis, RJ, foram construídos 30 coletores de laminado de pinho (Araucária sp., submersos (10 de cada a profundidades de 0,2, 2 e 4 m, respectivamente. Das espécies coletadas, Lyrodus floridanus foi a única a diminuir em abundância com a profundidade. As outras espécies não apresentaram diferenças significantes no número de indivíduos em relação às três profundidades ensaiadas.In order to study the vertical distribution of Teredinidae at Angra dos Reis, State of Rio de Janeiro, Brazil, 30 collectors of wood sheets (Araucária sp. were submerged (10 at each depth at 0,2, 2 and 4 m, respectively. Among the species collected, Lyrodus floridanus was the only one that did not whow significant variation in number of individuals in relation to depth. All the other species were unaffected, in number of individuals, by the different depths tested.

  5. Distribuição vertical de Teredinidae (Mollusca, Bivalvia) em Portogallo, Angra dos Reis, Rio de Janeiro, Brasil

    OpenAIRE

    Maria Júlia Martins Silva; Sérgio Henrique Gonçalves da Silva; Andréa de Oliveira Ribeiro Junqueira

    1988-01-01

    Para estudar a distribuição vertical de Teredinidae em Angras dos Reis, RJ, foram construídos 30 coletores de laminado de pinho (Araucária sp.), submersos (10 de cada) a profundidades de 0,2, 2 e 4 m, respectivamente. Das espécies coletadas, Lyrodus floridanus foi a única a diminuir em abundância com a profundidade. As outras espécies não apresentaram diferenças significantes no número de indivíduos em relação às três profundidades ensaiadas.In order to study the vertical dist...

  6. Biomphalaria occidentalis sp.n. from South America (Mollusca basommatophora pulmonata)

    OpenAIRE

    Lobato Paraense, W.

    1981-01-01

    A new species of South American planorbid snail, Biomphalaria occidentalis, is described. It is indistinguishable from B. tenagophila (Orbigny, 1835), by the characteristics of the shell and of most organs of the genital system. In B. tenagophila there is a pouch on the ventral wall of the vagina (Fig. 4A, vp), absent in B. occidentalis (Fig. 3A), and on the ventral wall of the vagina (Fig. 4A, vp), absent in B. occidentalis (Fig. 3A), and the prepuce is much wider than the penial sheath, its...

  7. The surface morphology of the ctenidia of Spondylus spinosus (Mollusca: Bivalvia) from Antalya Bay, Turkey

    Scientific Electronic Library Online (English)

    Deniz, Aksit; Beria Falakali, Mutaf; Ahmet, Balci.

    2013-02-01

    Full Text Available SciELO Brazil | Language: English Abstract in english The surface morphology of the ctenidia of Spondylus spinosus Schreibers, 1793 was studied with light and scanning electron microscopy for comparison with the gill structures of other bivalves. The demibranch of S. spinosus is heterorhabdic, with the principal filaments at the descending lamellae and [...] ordinary filaments at the ascending lamellae. The gill lamellae have a prominent gauze-like structure at their distal part, with numerous groups of eight ordinary filaments. They bear ciliary arrays on their frontal surfaces and ostia at their latero-frontal surfaces. Frequent cirral plates form regular interfilamentary junctions. The description of the gill structure of S. spinosus presented here can be used to derive implications for the correlations among the structure, habitat and mode of life of this species. At a particular stage of its adult life, Spondylus spinosus could be used as a subject for biomonitoring studies in natural and experimental environments.

  8. Spermatozoa and spermatogenesis in the northern quahaug Mercenaria mercenaria (Mollusca, Bivalvia)

    Science.gov (United States)

    Ying, Xue-Ping; Yang, Wan-Xi; Dahms, Hans-U.; Lin, Zhihua; Chai, Xueliang

    2008-12-01

    We studied the ultrastructure of spermatogenesis and spermatozoa in the northern quahaug, the clam Mercenaria mercenaria. Spermatogenetic cells gradually elongate. Mitochondria gradually fuse and increase in size and electron density. During spermatid differentiation, proacrosomal vesicles migrate towards the presumptive anterior pole of the nucleus and eventually form the acrosome. The spermatozoon of M. mercenaria is of a primitive type. It is composed of head, mid-piece, and tail. The acrosome shows a subacrosomal space with a short conical contour. The slightly curved nucleus of the spermatozoon contains fine-grained dense chromatin. The middle piece consists of a centriolar complex which is surrounded by four mitochondria. The flagellum has a standard “9 + 2” microtubular structure. The ultrastructure of spermatozoa and spermatogenesis of M. mercenaria shares a number of features with other species of the family Veneridae. M. mercenaria may be a suitable model species for further investigations into the mechanisms of spermatogenesis in the Bivalvia.

  9. Ultrastructure developments during spermiogenesis in Polydora ciliata (Annelida: Spionidae), a parasite of mollusca

    Science.gov (United States)

    Gao, Yan; Zhang, Tao; Zhang, Libin; Qiu, Tianlong; Xue, Dongxiu; Yang, Hongsheng

    2014-12-01

    Spionid worms of Polydora ciliata inhabit the shells of many commercially important bivalves and cause disease in molluscan aquaculture. Their sperm structure is closely related to their fertilization method. To give an insight into the sperm structure and spermatogenesis, ultrastructure details of the subcellular components of germ cells during spermiogenesis of Polydora ciliata are detected by transmission electron microscopy (TEM). In P. ciliata, during spermiogenesis, chromatin is regularly arranged as dense fibrils and becomes more condensed when the nucleus elongates. Microtubules do not surround the nucleus during its elongation. The Golgi phase is characterized by the formation of proacrosomal granules within the Golgi apparatus. The proacrosomal granules fuse to form a single, spherical acrosomal vesicle that migrates to the anterior pole of the cell. At the time of nuclear condensation, mitochondria become reduced in number but increased in size, causing deep indentation at the base of the nucleus. The mid-piece has a few mitochondria. The cap phase includes the spreading of the acrosomal granule over the surface of the nucleus of the differentiating spermatid. The acrosomal phase of spermiogenesis is typically associated with changes in the shape of the nucleus, acrosome and tail. The relationship of sperm ultrastructure to spermiogenesis in spionidae species was discussed.

  10. Distribution of Lymnaeidae (Mollusca: Pulmonata), intermediate snail hosts of Fasciola hepatica in Venezuela

    OpenAIRE

    Jp, Pointier; Noya, O.; Alarco?n Noya, B.; The?ron, A.

    2009-01-01

    An extensive malacological survey was carried out between 2005-2009 in order to clarify the exact number of lymnaeid species which may be intermediate hosts of Fasciola hepatica in Venezuela. Four species were discovered during this survey, including two local species: Lymnaea cubensis and Lymnaea cousini and two exotic species: Lymnaea truncatula and Lymnaea columella. The most common local species was L. cubensis which was found at 16 out of the 298 sampling sites. This species has a large ...

  11. A new and unusual species of Parachiton (Mollusca: Polyplacophora) from South Africa

    OpenAIRE

    Sirenko, Boris I.

    2011-01-01

    A new species of the genusParachiton, P. hodgsoni n.sp., which inhabits shallow water off the South African coast, is described. The radula is unusual for the genus Parachiton. It consists of about 160 transverse rows of very small mature teeth of which the major lateral teeth have very narrow tridentate cusps. The intermediate valves are granulose with the granules arranged in widely spaced, longitudinal rows on the central area of the valves. There are 20–31 longitudinal rows on the centr...

  12. Characterization of a highly repeated DNA family in tapetinae species (mollusca bivalvia: veneridae).

    Science.gov (United States)

    Passamonti, M; Mantovani, B; Scali, V

    1998-08-01

    A repetitive DNA family (phBglII400) was characterized in the clam species Tapes philippinarum (Veneridae Tapetinae). The tandemly repeated sequences are AT-rich and show a mainly pericentromeric localization, as most satellite DNAs do. Sequence analysis of phBglII400 DNA family showed a high level of intraspecific homogeneity. Furthermore a 200 bp subunit motif within the 400 bp monomer was apparent as well as the existence of two main "open reading frames" along the 400 bp sequence.In order to investigate the possible distribution of this DNA family among Veneridae, Southern blot analyses were performed on genomic DNAs of Tapes decussatus, Venerupis aurea and Paphia undulata (Tapetinae), Callista chione (Pitarinae), Chamelea gallina (Chioninae) and Venus verrucosa (Venerinae). The phBglII400 family has been found in two additional Tapetinae, namely V. aurea and P. undulata, but not in T. decussatus or other analyzed species. This pattern of sat-DNA distribution supports the high level of differentiation of T. decussatus observed in the previous gene-allozyme analysis. All of these suggest a better allocation of T. decussatus to a genus different from that of T. philippinarum. PMID:18462043

  13. Wood-Boring Bivalves (Mollusca: Teredinidae, Pholadidae) of Pacific coast of Colombia

    International Nuclear Information System (INIS)

    Twelve species of wood-boring bivalves, ten of the family Teredinidae and two of family Pholadidae were collected in mangroves at 6 locations of the Pacific coast of Colombia. This paper presents a brief description of these species, including size, ecological notes and geographical distribution.

  14. Life history of the bathyal octopus Pteroctopus tetracirrhus (Mollusca, Cephalopoda) in the Mediterranean Sea

    Science.gov (United States)

    Quetglas, Antoni; Ordines, Francesc; González, María; Franco, Ignacio

    2009-08-01

    The life cycle of the deep-sea octopus Pteroctopus tetracirrhus was studied from monthly samples obtained throughout the year in different areas of the western Mediterranean (mainly around the Balearic Islands and along the coast of the Iberian Peninsula). A total of 373 individuals (205 females, 168 males) were analyzed; females ranged from 4.5 to 14.0 cm mantle length (ML) and males from 4.5 to 11.5 cm ML. There were few small-sized octopuses (Iberian Peninsula as they appeared in 20% and 7%, respectively, of the hauls in these areas. The octopus inhabits the lower continental shelf and upper slope in both areas, primarily between 200 and 500 m depth. Modal lengths were followed from autumn, when recruits were caught by trawlers, to summer, when reproduction took place. Females grew from 8 to 10 cm ML from winter to spring, but this modal size did not increase further in summer; males grew from 7 to 9 cm ML from winter to spring. The total disappearance of large individuals after summer suggests a life cycle lasting a single year. The evolution of the monthly mean sizes showed that the growth was best described by log-linear functions in both sexes. The length at first maturity was clearly higher in females (12 cm ML) than in males (8 cm ML). A total of 30 different prey items, belonging to four major taxonomic groups (crustaceans, osteichthyes, cephalopods and gastropods), were identified in the stomach contents. The diet of the octopus was based on crustaceans and teleosts, which accounted for 75% and 23% of the prey items, respectively. Cephalopods and gastropods were accessory prey as they only represented 1.6% and 0.7%, respectively, of the total. The octopus showed a marked preference for the benthic fish Symphurus nigrescens and the endobenthic crustacean Alpheus glaber. The bathymetric distribution of P. tetracirrhus coincides with those of these two main prey, which suggests that the distribution of the octopus might be strongly linked to its trophic resources.

  15. Morphological and molecular evidence for cryptic species of springsnails [genus Pseudamnicola (Corrosella) (Mollusca, Caenogastropoda, Hydrobiidae)

    OpenAIRE

    Marian Ramos; Diana Delicado

    2012-01-01

    Several Pseudamnicola (Corrosella) populations of the central and eastern Iberian Peninsula have been ascribed to P. (C.) astieri (Dupuy, 1851), though recent evidence demonstrates the species could be endemic to the departments of Var and Alpes-Maritimes in France. Through the identification of cryptic species using a combined morphological and phylogenetic approach, this paper provides a detailed morphological description of P. (C.) astieri, clarifying its taxonomic boundaries and confirmin...

  16. Consideraciones morfológicas y taxonómicas sobre Ischnochiton (Ischnochiton rissoi (Payraudeau, 1826 (Mollusca, Polyplacophora

    Directory of Open Access Journals (Sweden)

    García García, F. J.

    1999-12-01

    Full Text Available The morphological variability of Ischnochiton (Ischnochiton rissoi (Payraudeau, 1826 has produced taxonomic discrepancies. In this paper, besides a taxonomic revision, the morphology of valves, perinotum and radula of several specimens of I. (I. rissoi is studied using Scanning Electron Microscopy. Although a notable morphological variability is present in this species, however, some common features identify all the varieties as an only taxon.La amplia variabilidad de ornamentación de Ischnochiton (Ischnochiton rissoi (Payraudeau, 1826 ha determinado que ejemplares de esta especie se hayan descrito como especies diferentes. En este artículo, además de revisar y discutir las diversas opiniones existentes, se ha realizado un estudio con microscopía electrónica de barrido de numerosos ejemplares y se ha observado la gran heterogeneidad de I. (I. rissoi en relación al tipo de ornamentación de la concha y del perinoto, aunque se han podido determinar ciertos caracteres comunes que permiten identificarlos como pertenecientes a una única especie.

  17. Morphological and molecular evidence for cryptic species of springsnails [genus Pseudamnicola (Corrosella (Mollusca, Caenogastropoda, Hydrobiidae

    Directory of Open Access Journals (Sweden)

    Marian Ramos

    2012-05-01

    Full Text Available Several Pseudamnicola (Corrosella populations of the central and eastern Iberian Peninsula have been ascribed to P. (C. astieri (Dupuy, 1851, though recent evidence demonstrates the species could be endemic to the departments of Var and Alpes-Maritimes in France. Through the identification of cryptic species using a combined morphological and phylogenetic approach, this paper provides a detailed morphological description of P. (C. astieri, clarifying its taxonomic boundaries and confirming it as a French endemic. In parallel, by comparing Pseudamnicola (Corrosella populations from the provinces of Castellón and Valencia in Eastern Spain, it was observed that rather than P. (C. astieri they represented a new species here described as P. (C. hauffei sp. n. Among other characters, the two species show marked differences in shell shape, male and female genital systems, radular formula and concentration of the nervous system. P. (C. hauffei sp. n. was also compared morphologically to another two Pseudamnicola (Corrosella species living in nearby areas [P. (C. hinzi Boeters, 1986 and P. (C. navasiana (Fagot, 1907], molecularly to P. (C. falkneri (Boeters, 1970, the type species of the subgenus, and to the rest of the Pseudamnicola (Corrosella species described so far. Morphological differentiation between the species is supported by a genetic divergence of 7.4% inferred from a partial sequence (658 bp of the mitochondrial gene cytochrome c oxidase subunit I (COI. On the basis of an average 8% (5.39 to 11.15% divergence estimated for the COI gene in other P. (Corrosella species reported in GenBank, the existence of two specific entities is here proposed, which will have impact on conservation policies both in France and in Spain.

  18. Allozyme differentiation in the cuttlefish Sepia officinalis (Mollusca: cephalopoda) from the NE Atlantic and Mediterranean.

    Science.gov (United States)

    Pérez-Losada, M; Guerra, A; Sanjuan, A

    1999-09-01

    The Atlantic-Mediterranean area has recently been proposed as a new phylogeographical area on the basis of concordance of genetic differentiation patterns observed in several marine species. However, additional taxa need to be studied to establish the phylogeographical relationship between the Atlantic and Mediterranean. Eleven samples of the cuttlefish Sepia officinalis around the Iberian Peninsula, one from the Canary Islands, and another from Fiumicino (Italy) were screened for 33 allozyme loci. Genetic variability was low in all samples (He between 0.022 and 0. 076). Intersample genetic differentiation was high (FST=0.220), mainly because of genetic variation in the non-Iberian samples. One locus (PEPD*), diagnostic between the Italian sample and all others, suggests the possible existence of hitherto unrecognized species or subspecies of Sepia in the Mediterranean Sea. The 11 Iberian samples exhibited moderate genetic differentiation (FST=0.100), which could be explained on the basis of genetic differentiation between Atlantic and Mediterranean samples. Significant clines in allele frequencies were observed for five out of six polymorphic loci. These results support a model of secondary intergradation (i.e. secondary contact of populations that were previously differentiated in isolation) similar to that previously proposed for other marine species from the Atlantic-Mediterranean area. PMID:10504425

  19. Morphological and molecular evidence for cryptic species of springsnails [genus Pseudamnicola ( Corrosella) (Mollusca, Caenogastropoda, Hydrobiidae)

    OpenAIRE

    Delicado, Diana; Ramos, Marian A.

    2012-01-01

    Several Pseudamnicola (Corrosella) populations of the central and eastern Iberian Peninsula have been ascribed to Pseudamnicola (Corrosella) astieri (Dupuy, 1851), though recent evidence demonstrates the species could be endemic to the departments of Var and Alpes-Maritimes in France. Through the identification of cryptic species using a combined morphological and phylogenetic approach, this paper provides a detailed morphological description of Pseudamnicola (Corrosella) astieri, clarifying ...

  20. Morphological and molecular evidence for cryptic species of springsnails [genus Pseudamnicola ( Corrosella) (Mollusca, Caenogastropoda, Hydrobiidae)].

    Science.gov (United States)

    Delicado, Diana; Ramos, Marian A

    2012-01-01

    Several Pseudamnicola (Corrosella) populations of the central and eastern Iberian Peninsula have been ascribed to Pseudamnicola (Corrosella) astieri (Dupuy, 1851), though recent evidence demonstrates the species could be endemic to the departments of Var and Alpes-Maritimes in France. Through the identification of cryptic species using a combined morphological and phylogenetic approach, this paper provides a detailed morphological description of Pseudamnicola (Corrosella) astieri, clarifying its taxonomic boundaries and confirming it as a French endemic. In parallel, by comparing Pseudamnicola (Corrosella) populations from the provinces of Castellón and Valencia in Eastern Spain, it was observed that rather than Pseudamnicola (Corrosella) astieri they represented a new species here described as Pseudamnicola (Corrosella) hauffeisp. n. Among other characters, the two species show marked differences in shell shape, male and female genital systems, radular formula and concentration of the nervous system. Pseudamnicola (Corrosella) hauffeisp. n. was also compared morphologically to another two Pseudamnicola (Corrosella) species living in nearby areas [Pseudamnicola (Corrosella) hinzi Boeters, 1986 and Pseudamnicola (Corrosella) navasiana (Fagot, 1907)], molecularly to Pseudamnicola (Corrosella) falkneri (Boeters, 1970), the type species of the subgenus, and to the rest of the Pseudamnicola (Corrosella) species described so far. Morphological differentiation between the species is supported by a genetic divergence of 7.4% inferred from a partial sequence (658 bp) of the mitochondrial gene cytochrome c oxidase subunit I (COI). On the basis of an average 8% (5.39 to 11.15%) divergence estimated for the COI gene in other Pseudamnicola (Corrosella) species reported in GenBank, the existence of two specific entities is here proposed, which will have impact on conservation policies both in France and in Spain. PMID:22639531