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Phylogenetic relationships among Opisthobranchia (Mollusca: Gastropoda) based on mitochondrial cox 1, trnV, and rrnL genes.  

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We reconstructed the phylogenetic relationships among 37 species representing seven main lineages within Opisthobranchia (Mollusca: Gastropoda) based on a mitochondrial fragment that included partial cox 1, complete trnV, and partial rrnL genes (about 2500 bp). Phylogenetic analyses confirmed tentatively that all studied main opisthobranch lineages conformed monophyletic groups except Nudibranchia. The sacoglossan Ascobulla was placed as the most basal lineage of opisthobranchs. The basommatophoran pulmonate Siphonaria was recovered within Opisthobranchia between Ascobulla and the remaining opisthobranchs. The latter were divided into two different lineages that await formal description: on one side, Cephalaspidea, Tylodinoidea, and Anaspidea (sharing features in the reproductive, digestive, and circulatory systems) were grouped together and, on the other Architectibranchia and Nudipleura (sharing similarities in the circulatory system) were recovered as sister group taxa. Two well-supported clades were recovered within Nudipleura: Pleuroanthobranchia (new taxon) and Cladobranchia. Pleuroanthobranchia (Pleurobranchoidea plus Anthobranchia) was defined by the presence of blood gland, the presence of calcareous spicules in the integument and the presence of a caecum with an opening directly into the stomach. The new molecular phylogeny provided a robust framework for comparative studies, and prompted a revision of the morphological synapomorphies diagnosing the main clades within opisthobranchs. PMID:15336672

Grande, Cristina; Templado, Josè; Cervera, J Lucas; Zardoya, Rafael

2004-11-01

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

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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 development or functional morphology, may then provide insights into the homology of the CSOs themselves. Results Nickel-lysine axonal tracing (“backfilling”) was used to stain the somata projecting into specific nerves in representatives of opisthobranch Gastropoda. Tracing patterns revealed the occurrence, size and relative position of somata and their axons and enabled these somata to be mapped to specific cell clusters. Assignment of cells to clusters followed a conservative approach based primarily on relative location of the cells. Each of the four investigated cerebral nerves could be uniquely identified due to a characteristic set of soma clusters projecting into the respective nerves via their axonal pathways. Conclusions As the described tracing patterns are highly conserved morphological characters, they can be used to homologise nerves within the investigated group of gastropods. The combination of adequate number of replicates and a comparative approach allows us to provide preliminary hypotheses on homologies for the cerebral nerves. Based on the hypotheses regarding cerebral nerve homology together with further data on ultrastructure and immunohistochemistry of CSOs published elsewhere, we can propose preliminary hypotheses regarding homology for the CSOs of the Opisthobranchia themselves. PMID:23597272

2013-01-01

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A comparative ultrastructural investigation of the cephalic sensory organs in Opisthobranchia (Mollusca, Gastropoda).  

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Cephalic sensory organs (CSOs) are specialised structures in the head region of adult Opisthobranchia involved in perception of different stimuli. The gross morphology of these organs differs considerably among taxa. The current study aims at describing the cellular morphology of the CSOs in order to reveal cellular patterns, especially of sensory epithelia, common for opisthobranchs. Transmission electron microscopy was used to characterise the fine structure of the organs and to compare the CSOs of four different opisthobranch species. The cellular composition of the sensory system is conserved among taxa. The epidermal cells in sensory regions are always columnar and ciliated cells are frequently apparent. The sensory cells are primary receptors arranged in subepidermal cell clusters. They extend dendrites which penetrate the epithelium and reach the surface. Some of the dendrites bear cilia, whereas others only build a small protuberance. Processing of sensory information takes place in the peripheral glomeruli of all species. Moreover, few taxa possess additional peripheral ganglia at the base of their CSOs. The results of the present study might support other investigations indicating that the posterior CSOs are primarily involved in distance chemoreception, whereas the anterior CSOs might be used for contact chemoreception and mechanoreception. PMID:17881026

Göbbeler, K; Klussmann-Kolb, A

2007-12-01

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Especies bentónicas de Opisthobranchia (Mollusca: Gastropoda) presentes en el litoral del norte peruano / Benthonic Opisthobranch species (Mollusca: Gastropoda) from the Northern Peruvian Coast  

Scientific Electronic Library Online (English)

Full Text Available SciELO Peru | Language: Spanish Abstract in spanish 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 científica disponible para el área de interés. Se presentan las 17 especies reportadas para dicha zona, clasificadas dentro del Grupo Info [...] rmal 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. Abstract in english The benthonic opisthobranch species reported for Northern Perú are presented here. The aim of the study is to show the species diversity of benthic opisthobranchs found in the northern coast, show the importance of their study and. awake the interest on these taxa. This work is based on a literature [...] recompilation from all studies available in the matter showing reported species for the area of interest. Seventeen species previously known for the northern coast, classified for the Informal Group Opisthobranchia within 6 clades, 12 families and 14 genera are shown. In spite of the high diversity potential that the area of study shows, relatively low numbers of species are found due to the scarce research in the matter.

Katia, Nakamura.

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Molecular phylogeny of euthyneura (mollusca: gastropoda).  

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A new phylogenetic hypothesis for Euthyneura is proposed based on the analysis of primary sequence data (mitochondrial cox1, trnV, rrnL, trnL(cun), trnA, trnP, nad6, and nad5 genes) and the phylogenetic utility of two rare genomic changes (the relative position of the mitochondrial trnP gene, and an insertion/deletion event in a conserved region of the mitochondrial Cox1 protein) is addressed. Both sources of phylogenetic information clearly rejected the monophyly of pulmonates, a group of gastropods well supported so far by morphological evidence. The marine basommatophoran pulmonate Siphonaria was placed within opisthobranchs and shared with them the insertion of a Glycine in the Cox 1 protein. The marine systellommatophoran pulmonate Onchidella was recovered at the base of the opisthobranch + Siphonaria clade. Opisthobranchs, Siphonaria, and Onchidella shared the relative position of the mitochondrial trnP gene between the mitochondrial trnA and nad6 genes. The land snails and slugs (stylommatophoran pulmonates) were recovered as an early split in the phylogeny of advanced gastropods. The monophyly of the Euthyneura (Opisthobranchia + Pulmonata) was rejected by the inclusion of the heterostrophan Pyramidella. PMID:14660702

Grande, Cristina; Templado, José; Cervera, J Lucas; Zardoya, Rafael

2004-02-01

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The complete mitochondrial genome of the nudibranch Roboastra europaea (Mollusca: Gastropoda) supports the monophyly of opisthobranchs.  

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The complete nucleotide sequence (14,472 bp) of the mitochondrial genome of the nudibranch Roboastra europaea (Gastropoda: Opisthobranchia) was determined. This highly compact mitochondrial genome is nearly identical in gene organization to that found in opisthobranchs and pulmonates (Euthyneura) but not to that in prosobranchs (a paraphyletic group including the most basal lineages of gastropods). The newly determined mitochondrial genome differs only in the relative position of the trnC gene when compared with the mitochondrial genome of Pupa strigosa, the only opisthobranch mitochondrial genome sequenced so far. Pupa and Roboastra represent the most basal and derived lineages of opisthobranchs, respectively, and their mitochondrial genomes are more similar in sequence when compared with those of pulmonates. All phylogenetic analyses (maximum parsimony, minimum evolution, maximum likelihood, and Bayesian) based on the deduced amino acid sequences of all mitochondrial protein-coding genes supported the monophyly of opisthobranchs. These results are in agreement with the classical view that recognizes Opisthobranchia as a natural group and contradict recent phylogenetic studies of the group based on shorter sequence data sets. The monophyly of opisthobranchs was further confirmed when a fragment of 2,500 nucleotides including the mitochondrial cox1, rrnL, nad6, and nad5 genes was analyzed in several species representing five different orders of opisthobranchs with all common methods of phylogenetic inference. Within opisthobranchs, the polyphyly of cephalaspideans and the monophyly of nudibranchs were recovered. The evolution of mitochondrial tRNA rearrangements was analyzed using the cox1+rrnL+nad6+nad5 gene phylogeny. The relative position of the trnP gene between the trnA and nad6 genes was found to be a synapomorphy of opisthobranchs that supports their monophyly. PMID:12270894

Grande, Cristina; Templado, José; Cervera, J Lucas; Zardoya, Rafael

2002-10-01

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

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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.

Bros, V.

2013-01-01

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

Scientific Electronic Library Online (English)

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.

Zaidett, Barrientos Llosa.

1165-11-01

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

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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

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

2014-10-20

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

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

G. Darrigran

2011-02-01

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

Scientific Electronic Library Online (English)

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

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

2011-02-01

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Cytogenetics of the land snails Cantareus aspersus and C. mazzullii (Mollusca: Gastropoda: Pulmonata).  

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A cytogenetic study was carried out on the chromosomes and nuclear DNA contents of the land snails Cantareus aspersus and C. mazzullii (Gastropoda: Pulmonata). Chromosomes were studied using Giemsa staining, banding methods and fluorescent in situ hybridization (FISH) with three repetitive DNA probes [18S rDNA, (GATA)(n) and (TTAGGG)(n)]. Results were very similar in the two species both showing (1) 54 bi-armed chromosomes [submetacentrics (SM) + metacentrics (M) + subtelocentrics (ST)]; (2) 10 terminal NORs after sequential application of rDNA FISH and silver staining; (3) uniform DNA fluorescence with CMA(3) and DAPI staining and (4) genomic composition considerably enriched both in highly- and moderately-repeated DNAs. The telomeric (TTAGGG)(n) sequence hybridized with the termini of all of the chromosomes in the two species. In spite of their apparent karyological uniformity, flow cytometry DNA assays showed that C. aspersus and C. mazzullii are characterized by different nuclear DNA content (C values are 3.58 and 3.08 pg, respectively) and slightly different base composition in their genomes. Present data on GS and AT% in C. mazzullii and C. aspersus confirm the trend toward high GS values and GC percentages among land snails. PMID:15857774

Vitturi, Roberto; Libertini, Angelo; Sineo, Luca; Sparacio, Ignazio; Lannino, Antonella; Gregorini, Armando; Colomba, Mariastella

2005-01-01

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

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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.

Abraham Breure

2013-03-01

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Neuromuscular development of Aeolidiella stephanieae Vald?z, 2005 (Mollusca, Gastropoda, Nudibranchia)  

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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. PMID:20205753

2010-01-01

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

Scientific Electronic Library Online (English)

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

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

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Variações anatômicas em Lymnaea columella (Mollusca, Gastropoda  

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

Marlene T. Ueta

1977-12-01

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

Scientific Electronic Library Online (English)

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

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

2013-09-01

18

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

Scientific Electronic Library Online (English)

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

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

19

Karakteristik Fisika-Kimia Perairan Dan Struktur Komunitas Moluska (Bivalvia Dan Gastropoda) Di Pantai Cermin Sumatera Utara  

Digital Repository Infrastructure Vision for European Research (DRIVER)

RAISSHA AMANDA SIREGAR, Physical and Chemical Characteristics of Aquatic and Community structures Many activities around Cermin Beach feared of mollusca (bivalvia and gastropoda) in Cermin Beach, North Sumatera. Under guided YUNASFI and ANI SURYANTI. can alter the water quality of Cermin Beach. Information and understanding of environmental change is indispensable in ecosystem monitoring efforts. This research aims to determine the status of the water quality seen on characteristics of chemic...

Siregar, Raissha Amanda

2014-01-01

20

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

DEFF Research Database (Denmark)

The food of four species of Cephalaspidea (Philine aperta, Philine denticulata, Philine scabra and Cylichna cylindracea) was studied in animals collected on silty clay bottoms at 20-35 m depth on the west coast of Sweden. The specimens were dissected. Only calcareous foraminiferans were found in the gizzard. Very small amounts of foreign particles were ingested. The foraminiferans were crushed in the gizzard and dissolved during their passage through the intestine and no remains of them could be identified in the fecal pellets. The three dominant foraminiferans in the habitat were one calcareous species, Ammonia batavus and two agglutinating species, Ammoscalaria pseudospiralis and Ammotium cassis. The test (shell) material of the latter two species was sand grains (quartz). It was inferred that the gastropods avoid agglutinating foraminiferans as food. Many calcareous but not agglutinating foraminiferans surround themselves with a “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.

Cedhagen, Tomas

1996-01-01

 
 
 
 
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Sperm tail differentiation in the nudibranch mollusc Hypselodoris tricolor (Gastropoda, Opisthobranchia).  

Science.gov (United States)

The sperm axoneme of Hypselodoris tricolor forms from a single centriole that is located initially beneath the plasma membrane and then migrates to the nuclear surface. A conspicuous centriolar adjunct-like formation is present in the neck of midspermatids, but it becomes very reduced at the end of spermiogenesis. In spermatocyte and spermatid mitochondria, intracristal bodies originate from the accumulation of a dense material in some cristae. From our observations and foregoing reports, it may be concluded that the process of sperm tail differentiation in opisthobranchs resembles that in pulmonates, whereas it differs in many respects from that occurring in prosobranchs. The appearance of intracristal bodies in modified mitochondria seems to be a special feature of spermatogenesis in the opisthobranchs that does not occur in the two other groups of gastropod molluscs. PMID:3235038

Medina, A; Moreno, F J; García-Herdugo, G

1988-06-01

22

Histochemical and ultrastructural characterization of the posterior esophagus of Bulla striata (Mollusca, Opisthobranchia).  

Science.gov (United States)

The posterior esophagus of Bulla striata, running from the gizzard to the stomach, was investigated with light and electron microscopy to obtain new data for a comparative analysis of the digestive system in cephalaspidean opisthobranchs. In this species, the posterior esophagus can be divided into two regions. In the first, the epithelium is formed by columnar cells with apical microvilli embedded in a cuticle. Many epithelial and subepithelial secretory cells are present in this region. In both, electron-lucent secretory vesicles containing filaments and a peripheral round mass of secretory material fill the cytoplasm. These acid mucus-secreting cells may also contain a few dense secretory vesicles. In the second part of the posterior esophagus, the cuticle is absent and the epithelium is ciliated. In this region, epithelial cells may contain larger lipid droplets and glycogen reserves. Subepithelial secretory cells are not present, and in epithelial secretory cells the number of dense vesicles increases, but most secretory cells still contain some electron-lucent vesicles. These cells secrete a mixture of proteins and acid polysaccharides and should be considered seromucous. The secretory cells of the posterior esophagus are significantly different from those previously reported in the anterior esophagus of this herbivorous species. PMID:20883598

Lobo-da-Cunha, Alexandre; Oliveira, Elsa; Ferreira, Iris; Coelho, Rita; Calado, Gonçalo

2010-12-01

23

Stomach of Aplysia depilans (Mollusca, Opisthobranchia): a histochemical, ultrastructural, and cytochemical study.  

Science.gov (United States)

We report the results of a morphological, histochemical, and cytochemical characterization of the Aplysia depilans stomach, an organ little studied in opisthobranchs. Very thin ciliated cells with microvilli on their apical surfaces are predominant in the epithelium lining the lumen of the stomach. Many lysosomes with a strong arylsulphatase activity were present in the apical regions of these cells that could also contain some lipid droplets and glycogen. Small peroxisomes were observed, usually around lipid droplets or mitochondria. Bottle-shaped secretory cells are very common in this epithelium and produce a secretion rich in proteins and acidic mucopolysaccharides. Most of the cytoplasm of these mucus-producing cells was filled with a very high number of granules and the nucleus is dislocated to the basal region. Cisternae of rough endoplasmic reticulum were abundant around the nucleus and several Golgi stacks were also present in this area. In spite of the variation in the electron density of the granules, only one type of secretory cell seems to be present in the stomach epithelium, since granules with very different electron densities were frequently found in the same cell. A few neurons were also found in the stomach epithelium of this species. Fibrocytes, muscle cells, nerves, and amebocytes were observed in the connective tissue of the stomach wall. PMID:12655617

Lobo-da-Cunha, Alexandre; Batista-Pinto, Carla

2003-06-01

24

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

Scientific Electronic Library Online (English)

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

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

25

Imposex in endemic volutid from Northeast Brazil (Mollusca: Gastropoda  

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

Ítalo Braga de Castro

2008-10-01

26

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

Scientific Electronic Library Online (English)

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

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

1065-10-01

27

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

Scientific Electronic Library Online (English)

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

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

2010-07-01

28

The first molecular phylogeny of cladobranchian opisthobranchs (Mollusca, Gastropoda, Nudibranchia).  

Science.gov (United States)

The first molecular phylogeny is presented for the highly diverse, opisthobranch molluscan Cladobranchia. This study, the most comprehensive for Cladobranchia to date, used new sequences of two mitochondrial and one nuclear genes for 95 specimens from 22 families and 38 genera with a species of Pleurobranchoidea as outgroup. Although our results do not resolve all the relationships within the Cladobranchia, there are significant findings that have implications for the systematics of the Cladobranchia. Cladobranchia represents a monophyletic group within the Nudibranchia with the exception of a clade containing species of Melibe. These species share a deletion of four codons in the COI gene that may account for their strong divergence from the remainder of the Cladobranchia. Bornellidae is the sister group to the rest of Cladobranchia, but this relationship is weakly supported. A series of well-supported clades within Cladobranchia show little structure as to their relationships to each other in the current analysis. The relationships of Tethys and Hancockidae to other Cladobranchia remain unresolved. Pseudobornella orientalis is here transferred to Dendronotus as D. orientalis. With this systematic change Bornellidae and Dendronotidae are now monophyletic. Lomanotus appears as the sister group to a monophyletic Aeolidida, but this relationship is not strongly supported. Scyllaeidae is monophyletic in this study with Scyllaea being sister taxon to Notobryon. The Proctonotidae are monophyletic and are clearly nested in the Cladobranchia. Dotoidae is monophyletic when Pinufius is included in this clade. Doriodomorpha is sister taxon to the Arminidae. Within Arminidae, Dermatobranchus and Armina, as they are presently constructed, are not monophyletic. There is an interesting potential sister group relationship between Dirona albolineata and Lemina millecra that requires additional exploration with expanded taxon sampling. In this study, Marianina rosea is nested within Tritoniidae, thus we consider Aranucidae, and its synonym Marianinidae, as a junior synonym of Tritoniidae to preserve the monophyly of Tritoniidae. PMID:20460158

Pola, Marta; Gosliner, Terrence M

2010-09-01

29

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

Scientific Electronic Library Online (English)

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

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

30

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

DEFF Research Database (Denmark)

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.

Joerger, Katharina; Kristof, Alen

2008-01-01

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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)

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

DAVID, VELIZ; JULIO A, VASQUEZ.

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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  

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Full Text Available Se describe el ciclo gonádico de Tegula aureotincta en Bahía Asunción Baja California Sur. Se recolectaron mensualmente de 25 a 30 organismos de enero a diciembre de 2006. Estos fueron procesados con la técnica histológica de inclusión en parafina, el tejido de la gónada se cortó a 7 ?m de grosor, los 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.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 hematoxylin-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.

Nurenskaya Vélez-Arellano

2011-08-01

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

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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 animais 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.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.

Ana Valêsca P. Lima

2009-06-01

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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)

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

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

2009-06-01

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

Oscar Efraín Holguin Quiñones

2008-09-01

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

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in english Trimethylsulfonium, a compound present in the midgut gland of the sea hare Aplysia brasiliana, negatively modulates vagal response, indicating a probable ability to inhibit cholinergic responses. In the present study, the pharmacological profile of trimethylsulfonium was characterized on muscarinic [...] and nicotinic acetylcholine receptors. In rat jejunum the contractile response induced by trimethylsulfonium (pD2 = 2.46 ± 0.12 and maximal response = 2.14 ± 0.32 g) was not antagonized competitively by atropine. The maximal response (Emax) to trimethylsulfonium was diminished in the presence of increasing doses of atropine (P

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

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

C.M. Kerchove

2002-04-01

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

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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.

Martins-Sousa RL

2001-01-01

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Zona localization of shell matrix proteins in mantle of Haliotis tuberculata (Mollusca, Gastropoda).  

Science.gov (United States)

Organic matrix from molluscan shells has the potential to regulate calcium carbonate deposition and crystallization. Control of crystal growth thus seems to depend on control of matrix protein secretion or activation processes in the mantle cells, about which little is known. Biomineralization is a highly orchestrated biological process. The aim of this work was to provide information about the source of shell matrix macromolecule production, within the external epithelium of the mantle. An in vivo approach was chosen to describe the histologic changes in the outer epithelium and in blood sinus distribution, associated with mantle cells implicated in shell matrix production. Our results characterized a topographic and time-dependent zonation of matrix proteins involved in shell biomineralization in the mantle of Haliotis. PMID:15747090

Jolly, Cécile; Berland, Sophie; Milet, Christian; Borzeix, Sandrine; Lopez, Evelyne; Doumenc, Dominique

2004-01-01

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

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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

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

2014-02-01

 
 
 
 
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Aspectos histológicos das gônadas hermafroditas de Biomphalaria glabrata e Bradybaena similaris (Mollusca, Gastropoda, Pulmonata)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese Biomphalaria glabrata (Say, 1818) é um gastrópode pulmonado de água doce que desperta grande interesse médico e veterinário. Bradybaena similaris (Férussac, 1821) é um gastrópode pulmonado terrestre considerado uma praga agrícola de plantações de hortaliças. Ambas as espécies são hospedeiras interme [...] diárias de helmintos. Esses moluscos possuem uma gônada hermafrodita produtora de óvulos e espermatozóides de forma simultânea. Neste estudo foram avaliados aspectos histomorfológicos das gônadas hermafroditas de B. glabrata e B. similaris. A gônada de B. similaris encontra-se subdividida em lobos com glândulas em seu interior, o que não foi observado em B. glabrata. Além disso, em B. similaris as células germinativas estão acumuladas em determinados pontos e com a presença de um ovócito em cada folículo da gônada; não obstante, em B. glabrata as células germinativas encontraram-se justapostas e com mais de um ovócito em cada folículo. Abstract in english Biomphalaria glabrata (Say, 1818) is a freshwater pulmonate gastropod that represents great medical importance. Bradybaena similaris (Férussac, 1821) is a terrestrial pulmonate gastropod and an important plague to the different plant cultures with economic interest. Both species are intermediate hos [...] ts of helminths. These molluscs have hermaphrodites gonads producing eggs and sperm. Here, we examined histoformological aspects of hermaphrodites gonads of both B. glabrata and B. similaris. The gonad of B. similaris is subdivided into lobes and presence of glands in its interior, which was not observed in B. glabrata. Moreover, in B. similaris the germ cells are accumulated in some areas, and has one oocyte in each follicle in the gonad; however, in B. glabrata the germ cells are juxtaposed and more than one oocyte in each follicle.

Rinaldo Florêncio da, Silva; Jairo José Matozinho, Cubas; Josué de, Moraes.

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

Science.gov (United States)

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 midkine as a promising new biomarker of effect in the environment risk assessment policy.

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

2007-10-01

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

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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.

Marcelo de Oliveira Soares

2010-08-01

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

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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 distrib...

Marcelo de Oliveira Soares; Carlos Augusto Oliveira de Meirelles; Valesca Brasil Lemos

2010-01-01

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

Science.gov (United States)

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

Ruthensteiner, Bernhard; Schaefer, Kurt

2002-01-01

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

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

Diéguez Fernández, L

2012-05-01

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

Scientific Electronic Library Online (English)

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

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

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

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

Janine Oliveira Arruda

2011-12-01

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

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

J. Paulo Cabral

2007-03-01

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

Science.gov (United States)

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

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

2014-01-01

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

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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

Hoffmann, Erik

2012-01-01

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Two glutathione S-transferase isoenzymes purified from Bulinus truncatus (Gastropoda: Planorbidae).  

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We purified and characterized two major glutathione S-transferase isoenzymes (GST2 and GST3) from snail Bulinus truncatus (Mollusca, Gastropoda, Planorbidae) tissue. The Km with respect to 1-chloro-2, 4-dinitrobenzene (CDNB) for both isoenzymes was increased as the pH decreased. Km of both isoenzymes with respect to glutathione (GSH) doubled when the pH was increased from 6.0 to 6.5. Acid inactivated GST2 and GST3 and the two enzymes were almost inactive at pH 3.5. However, they retain the full activity for at least 20 h when incubated at pH between 6.0 and 9.0. The optimum temperature was 45 degrees C for GST2 and 50 degrees C for GST3. The half lifetime at 50 degrees C was 70 min and 45 min for GST2 and GST3 isoenzymes, respectively. Addition of 5 mM GSH to the incubation buffer increased the half life of both isoenzymes more than fourfold. The activation energy for catalyzing the conjugation of CDNB was 1.826 and 3.435 kcal/mol for GST2 and GST3, respectively. I50 values for Cibacron blue, bromosulphophthalein, indocyanine green, hematin and ethacrynic acid were 0.76 microM, 47.9 microM, 7.59 microM, 0.03 microM and 0.79 microM for GST2, and 0.479 microM, 79.4 microM, 89.1 microM, 32.4 microM and 1.15 microM for GST3, respectively. Cibacron blue and indocyanine green were non-competitive inhibitors, while hematin was a mixed inhibitor. Bromosulphophthalein was found to be a competitive inhibitor for GST2 and a mixed inhibitor for GST3. PMID:16311050

Abdalla, Abdel-Monem; El-Mogy, Mohamed; Farid, Nevin M; El-Sharabasy, Mohamed

2006-01-01

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

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

Eder Carvalho da, Silva; Elianne Pessoa, Omena.

2014-09-02

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

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

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

2014-04-23

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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  

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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.

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

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

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

Ricardo Silva, Absalão; Renata Alves Pinheiro, Roberg.

1999-06-01

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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  

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

Cândido Simões Ferreira

1989-01-01

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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)  

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

Ana, Parra-Flores; Rebeca, Gasca.

2009-12-01

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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  

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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.

Mônica, Picoral; José Willibaldo, Thomé.

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

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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.

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

2004-06-01

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

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Full Text Available The use of antifouling paints containing the biocide compound tributyltin (TBT has been shown as an inductor of imposex in neogastropods mollusks. Imposex is characterized by the development of male features in females, mainly the appearance of a no functional vas deferens and penis. Samples of Thais rustica were collected in eight sites in the metropolitan area of Natal city, Rio Grande do Norte state, northeast Brazil, and examined for occurrence of imposex, which was found in many females. The higher imposex levels were presented by samples from sites near city harbor.A utilização de tintas antiincrustrantes contendo o composto biocida tributilestanho (TBT tem induzido moluscos neogastrópodes ao imposex. O imposex é caracterizado pelo surgimento de caracteres sexuais masculinos, sobretudo, pênis e vaso deferente não funcionais em fêmeas desses moluscos. Foram coletadas amostras de Thais rústica em oito estações ao longo da costa da cidade de Natal no Rio Grande do Norte. Esses animais foram analisados quanto a presença e o grau de imposex que apresentavam. Os níveis mais elevados de imposex foram observados na estação mais próxima ao porto.

Ítalo Braga de Castro

2004-06-01

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

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

Roger G. Dolorosa

2005-12-01

63

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

Science.gov (United States)

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

Breure, Abraham S H; Ablett, Jonathan D

2012-01-01

64

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

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Full Text Available 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.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.

Aline Fernandes Alves de Lima

2006-03-01

65

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

Scientific Electronic Library Online (English)

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.

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

66

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

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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 temporary wet areas. These snails were identified as Galba truncatula (n?=?2474) (the main intermediate host of F. hepatica in Europe) and Radix sp. (n?=?4629). Moreover, several biological and non-biological variables were also recorded from the different biotopes. DNA was extracted from each snail collected using Chelex® technique. DNA samples were screened through a multiplex PCR that amplifies lymnaeid internal transcribed spacer 2 gene sequences (500–600 bp) (acting as an internal control) and a 124 bp fragment of repetitive DNA from Fasciola sp. Results Lymnaeid snails were found in 75 biotopes (53.2%). Thirty individuals of G. truncatula (1.31%) and 7 of Radix sp. (0.16%) were found to be positive for Fasciola sp. The seven positive Radix sp. snails all belonged to the species R. balthica (Linnaeus, 1758). Classification and regression tree analysis were performed in order to better understand links and relative importance of the different recorded factors. One of the best explanatory variables for the presence/absence of the different snail species seems to be the geographic location, whereas for the infection status of the snails no obvious relationship was linked to the presence of cattle. Conclusions Epidemiological implications of these findings and particularly the role of R. balthica as an alternative intermediate host in Belgium and Luxembourg were discussed. PMID:24524623

2014-01-01

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

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

Moreno, D.

2003-01-01

68

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.)

69

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

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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 bourbonicasp. n. from La Réunion and Doriopsilla nigrocerasp. n. from the Persian Gulf coast of Saudi Arabia. Chromodoris cavae is removed from its synonymy with Chromodoris 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. PMID:22711992

Yonow, Nathalie

2012-01-01

70

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

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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.

Nathalie Yonow

2012-05-01

71

Light and electron microscopy study of the salivary glands of the carnivorous opisthobranch Philinopsis depicta (Mollusca, Gastropoda).  

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Cephalaspideans are a group of opisthobranch gastropods that comprises carnivorous and herbivorous species, allowing an investigation of the relationship between these diets and the morphofunctional features of the salivary glands. In this study, the salivary glands of the carnivorous cephalaspidean Philinopsis depicta were observed by light and electron microscopy. The secretory epithelium of these ribbon-shaped glands is formed by ciliated cells, granular cells and cells with apical vacuole. In ciliated cells the nucleus and most cytoplasmic organelles are located in the wider apical region and a very thin stalk reaches the base of the epithelium. These cells possess significant amounts of glycogen. Granular cells are packed with electron-dense secretory granules and also contain several cisternae of rough endoplasmic reticulum and Golgi stacks. The other type of secretory cell is mainly characterized by the presence of a large apical vacuole containing secretion. These cells possess high amounts of rough endoplasmic reticulum cisternae and several Golgi stacks. Vesicles with peripheral electron-dense material are also abundant, and seem to fuse to form the apical vacuole. The available data point out to a significant difference between the salivary glands of carnivorous and herbivorous cephalaspidean opisthobranchs, with an intensification of protein secretion in carnivorous species. PMID:19362728

Lobo-da-Cunha, Alexandre; Ferreira, Iris; Coelho, Rita; Calado, Gonçalo

2009-10-01

72

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)

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.

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

1197-12-01

73

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

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Full Text Available Omalonyx matheroni is a succineid gastropod that lives on aquatic macrophytes and on emergent vegetation in the wetlands of inner deltas, lakes and dikes. Occurrences of this species were recorded in the municipalities of Ibitinga (SP and Paranaguá (PR, broadening its distribution southwards in South America. Until now this species had been recorded in Demerara (Guiana, Zanderij and Belwaarde (Suriname, Guiana Francesa, Peru, Limoncocha (Equador, Amazonas, Pará, Pernambuco, Rio de Janeiro and Minas Gerais (Brazil, as well as on the islands of Guadalupe and Trinidade.

Maria Cristina Dreher Mansur

2009-06-01

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

Scientific Electronic Library Online (English)

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

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

2013-06-01

75

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)

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.

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

76

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. 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.

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

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

MAURER Rafael Lucyk

2002-01-01

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

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Full Text Available 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.

Abraham Breure

2012-04-01

79

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

Science.gov (United States)

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.

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

2010-04-01

80

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

Energy Technology Data Exchange (ETDEWEB)

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

Vanucci, Silvana [Department of Animal Biology and Marine Ecology, University of Messina, Salita Sperone 31, 98166 S Agata, Messina (Italy)]. E-mail: silvana.vanucci@unime.it; Minerdi, Daniela [Department of Animal Biology and Genetics, University of Florence, via Romana 19, 50125 Florence (Italy); Kadomatsu, Kenji [Department of Biochemistry, University of Nagoya Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550 (Japan); Mengoni, Alessio [Department of Animal Biology and Genetics, University of Florence, via Romana 19, 50125 Florence (Italy); Bazzicalupo, Marco [Department of Animal Biology and Genetics, University of Florence, via Romana 19, 50125 Florence (Italy)

2005-11-30

 
 
 
 
81

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

82

Effects of endocrine disruptors on prosobranch snails (Mollusca: Gastropoda) in the laboratory. Part III: Cyproterone acetate and vinclozolin as antiandrogens.  

Science.gov (United States)

The effects of suspected endocrine disrupting chemicals on freshwater and marine prosobranch species were analysed in laboratory experiments. In this last of three publications, the responses of the fresh water snail Marisa cornuarietis and of two marine prosobranchs (Nucella lapillus, Nassarius (Hinia) reticulatus) to the antiandrogenic model compounds cyproterone acetate (CPA) and vinclozolin (VZ) are presented. The snails were exposed to nominal CPA concentrations of 1.25 mg/L alone and simultaneously to a potent synthetic estrogen (ethinylestradiol), androgen (methyltestosterone) or an indirectly acting xeno-androgen (tributyltin) in experiments with adult specimens and in a life cycle test for 12 months. Marisa and Nucella were furthermore exposed to nominal concentrations of 0.03-1.0 microgram VZ/L for up to 5 months. The antiandrogens induced a number of biological responses in all three species. The length of the penis and of accessory male sex organs (e.g., penis sheath, prostate) were significantly reduced. For Marisa, this effect occurred only in sexually immature specimens and was reversible as the males attained puberty. Typical androgen-mediated responses (imposex development, delayed spermatogenesis, tubulus necrosis of the testis with orchitis and Leydig cell hyperplasia) were partially or totally suppressed by a simultaneous administration of CPA. In the two marine species even adult, sexually mature males responded to antiandrogens with a reduction of the male sex organs and an advancement of the sexual repose phase. The results for CPA and VZ are compared with the effects of an exposure to xeno-estrogens (bisphenol A, octylphenol) and xeno-androgens (triphenyltin, tributyltin) in the same species. Each group of endocrine disruptors induces a characteristic set of toxicological effects in prosobranch snails which can be used as endpoints in an organismic invertebrate test for the identification of endocrine mimetic test compounds. Estrogens cause primarily an induction of superfemales resulting in an increased female mortality by the enhancement of spawning mass and egg production. The main effects of androgens are a virilization of females by imposex development and a marked decrease of the fecundity. Compared with estrogens and androgens, the antiandrogen responses seem to be less drastic and might have--in contrast to the two other disruptor classes--no biologically significant effects at the population level. PMID:11759570

Tillmann, M; Schulte-Oehlmann, U; Duft, M; Markert, B; Oehlmann, J

2001-12-01

83

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

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

Henk K. Mienis

2010-01-01

84

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

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.

Mienis, Henk K.; Oz Rittner

2010-01-01

85

Ocorrência de Lymnaea columella (Gastropoda: Lymnaeidae, hospedeiro intermediário da Fasciola hepatica, para o Estado da Paraíba, Brasil  

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Full Text Available Foi registrada a ocorrência de Lymnaea columella (Gastropoda: Lymnaeidae, primeiro hospedeiro intermediário da Fasciola hepatica, para o Estado da Paraíba, Brasil, associado a macrófitas aquáticas.

Abílio Francisco José Pegado

1998-01-01

86

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)

87

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

Directory of Open Access Journals (Sweden)

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

Francisco José Pegado Abílio

1998-04-01

88

Notes on Opisthobranchia  

Scientific Electronic Library Online (English)

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 [...

Ernesto, Marcus.

89

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  

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

CARLOS MOLINET

2005-09-01

90

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

Scientific Electronic Library Online (English)

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

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

2005-09-01

91

50 CFR 665.621 - Definitions.  

Science.gov (United States)

...zoanthid corals Zoanthinaria. Hydrozoans, Bryzoans. sea squirts Tunicates. sea cucumbers and sea urchins Echinoderms. Those species not listed as CHCRT Mollusca. sea snails Gastropoda. Trochus. sea slugs...

2010-10-01

92

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

Directory of Open Access Journals (Sweden)

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

Guilherme R. Gorni

2006-12-01

93

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

Scientific Electronic Library Online (English)

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

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

1059-10-01

94

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

Scientific Electronic Library Online (English)

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

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

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Numerous giant mollusca contagiosa and kaposi?s sarcomas with HIV disease  

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Full Text Available A 50-year old man with a history of multiple contacts with commercial sex workers and two episodes of blood transfusions in Bombay, presented with giant mollusca contagiosa, Kaposi?s sarcomas and refractory pulmonary tuberculosis. Patient was confirmed to be infected with HIV by ELISA and Western blot method.

Singh Ravi

1996-01-01

96

Amundsen Sea Mollusca from the BIOPEARL II expedition  

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Full Text Available Information regarding the molluscs in this dataset is based on the epibenthic sledge (EBS samples collected during the cruise BIOPEARL II / JR179 RRS James Clark Ross in the austral summer 2008. A total of 35 epibenthic sledge deployments have been performed at five locations in the Amundsen Sea at Pine Island Bay (PIB and the Amundsen Sea Embayment (ASE at depths ranging from 476 to 3501m. This presents a unique and important collection for the Antarctic benthic biodiversity assessment as the Amundsen Sea remains one of the least known regions in Antarctica. Indeed the work presented in this dataset is based on the first benthic samples collected with an EBS in the Amundsen Sea. However we assume that the data represented are an underestimation of the real fauna present in the Amundsen Sea. In total 9261 specimens belonging to 6 classes 55 families and 97 morphospecies were collected. The pecies richness per station varied between 6 and 43. Gastropoda were most species rich 50 species followed by Bivalvia (37, Aplacophora (5, Scaphopoda (3 and one from each of Polyplacophora and Monoplacophora.

Camille Moreau

2013-04-01

97

Predação e foresia (ocasional? entre imaturos de Simuliidae (Diptera: Culicomorpha e Asolene (Pomella Megastoma (Sowerby, 1825 (Mollusca: Gastropoda: Ampullaridae Predation and phoretic association (occasional? among immature stages of Simuliidae (Diptera: Culicomorpha and Asolene (Pomella megastoma (Sowerby, 1825 (Mollusca: Ampullaridae  

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Full Text Available The predation and phoretic association (occasional? among simulids and mollusks are being registered here for the first time on the Neotropical region. These inter-relations observations were obtained among Asolene (Pomella megastoma (Sowerby, 1825 and the simulids: Simulium (Thyrsopelma Orbitale Lutz, 1910; Simulium (Psaroniocompsa spp. The material studied is proceeding from the Uruguai river Hidrological Basin. Based on the mollusks natural habitat, it is here suggested his use as a possible integrated management element for simulids species which immature stages live on mighty river with rocks.

Sandra Magni Darwich

1989-01-01

98

Quitones (Mollusca: Polyplacophora) de El Salvador, América Central  

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Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish 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. Abstract in english 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 (T [...] hiele, 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.

Cedar I, García-Ríos; Migdalia, Álvarez-Ruiz; José E, Barraza; Ana M, Rivera; Carlos R, Hasbún.

99

Quitones (Mollusca: Polyplacophora de El Salvador, América Central  

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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.

Cedar I García-Ríos

2007-03-01

100

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

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Full Text Available Com base no exame dos tipos, são redescritas as espécies Vaginula andreana Semper, 1885, Vaginula reinhardti Semper, 1885 e Vaginula trilineata Semper, 1885. As espécies provêm, respectivamente, de Maurício (Ilhas Mascarenhas; leg. Andrea, Macau, China (leg. Reinhardt, e provavelmente Maurício (Ilhas Mascarenhas; leg. Andrea, encontrado num pote de plantas no Jardim Botânico de Copenhague. Discute-se a sinonímia das espécies.Upon the examination of the types, the species Vaginula andreana Semper, 1885, Vaginula reinhardti Semper, 1885, and Vaginula trilineata Semper, 1885, are redescribed. They proceed from, respectively: Mauritius (Mascarene ls.; leg. Andrea; Macao, China (leg. Reinhardt: probably Mauritius (Mascarene ls.; leg. Andrea; found in a pot of plants in the Botanical Garden of Copenhagen. The synonymy of the species is discussed.

José Willibaldo Thomé

1988-07-01

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

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Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese Com base no exame dos tipos, são redescritas as espécies Vaginula andreana Semper, 1885, Vaginula reinhardti Semper, 1885 e Vaginula trilineata Semper, 1885. As espécies provêm, respectivamente, de Maurício (Ilhas Mascarenhas; leg. Andrea), Macau, China (leg. Reinhardt), e provavelmente Maurício (Il [...] has Mascarenhas; leg. Andrea, encontrado num pote de plantas no Jardim Botânico de Copenhague). Discute-se a sinonímia das espécies. Abstract in english Upon the examination of the types, the species Vaginula andreana Semper, 1885, Vaginula reinhardti Semper, 1885, and Vaginula trilineata Semper, 1885, are redescribed. They proceed from, respectively: Mauritius (Mascarene ls.; leg. Andrea); Macao, China (leg. Reinhardt): probably Mauritius (Mascaren [...] e ls.; leg. Andrea; found in a pot of plants in the Botanical Garden of Copenhagen). The synonymy of the species is discussed.

José Willibaldo, Thomé.

102

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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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

Caballer, Manuel; Ortea, Jesus; Narciso, Samuel

2011-01-01

103

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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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.

Jesus Ortea

2011-07-01

104

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

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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.

A Franchini

2005-09-01

105

Respuesta de Bostryx conspersus y Succinea peruviana (Mollusca, Gastropoda al evento "El Niño 1997-98" en las lomas de Lachay (Lima, Perú  

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Full Text Available Se presenta un análisis de las respuestas de dos caracoles terrestres, Bostryx conspersus (Bulimulidae y Succinea peruviana (Succineidae de las Lomas de Lachay (Lima, Perú a las condiciones ambientales cambiantes antes, durante y después del evento "El Niño 1997-98". Ambas respondieron con la misma tendencia a los dos picos de "El Niño 1997-98", retardando el inicio y recortando sus períodos de actividad en 1997, y no entraron en estivación en el verano de 1998, más bien con una explosión poblacional. Por otro lado, es diferencial la intensidad de las respuestas. Estos cambios se relacionaron positivamente con otro factor cambiante durante "El Niño 1997-98", la cobertura vegetal.

Rina Ramírez

2014-06-01

106

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

Carmen Fuentealba

2012-11-01

107

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

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

Bandel K

2010-09-01

108

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

Carmen, Fuentealba; Ricardo, Figueroa.

2012-11-01

109

Agfa morandi sp. n. (Rhabditida, Agfidae) a parasite of Limax sp. (Gastropoda, Limacidae).  

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Agfa morandi sp. n. (Rhabditida, Agfidae), a parasite of Limax sp. (Gastropoda, Limacidae) from Py (Pyrenean mountains, France), is described and illustrated. The present species can be separated from the other two members of the same genus, A. flexilis (Rudolphi, 1819) Morand, 1990 and A. tauricus Korol and Spiridonov, 1991, by size measurements, number and disposition of the male's genital papillae, shape of the spicule and number of eggs in the female. PMID:12122432

Ribas, A; Casanova, J C

2002-08-01

110

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  

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

Norma Angélica Santibañez Aguascalientes

2013-03-01

111

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)

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.

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

2013-03-01

112

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)  

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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.

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

113

[Presence of glochidia of Diplodon chilensis Hass 1931 (Mollusca, Pelecypoda) in Patagonian freshwater fishes].  

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The presence of glochidia of Diplodon chilensis Haas 1931 (Mollusca, Pelecypoda) has been reported in gills of wild freshwater fish in the Argentinian Patagonia. Death occurrences due to glochidiasis have not been observed either in wild fish or in cultured fish. The records of Oncorhynchus mykiss, Galaxias platei, Patagonia hatcheri and Percichtys trucha extend the number of known hosts for D. chilensis and add new localities, thus extending the distributions of the mollusc. PMID:7654294

Semenas, L; Ortubay, S; Ubeda, C

1994-01-01

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Lidocaine and prilocaine toxicity in a patient receiving treatment for mollusca contagiosa.  

Science.gov (United States)

We describe a 3-year-old child with mollusca contagiosa whose caregiver applied a eutectic mixture of 5% lidocaine and prilocaine (EMLA) in excessive amounts with the subsequent development of adverse reactions, including methemoglobinemia and hypoxemia. Because of the significant systemic absorption of lidocaine and prilocaine, the patient required overnight admission to the pediatric intensive care unit for close monitoring. A brief description of the proper dosing, pharmacokinetics, and possible side effects of EMLA cream are reviewed. PMID:11174427

Touma, S; Jackson, J B

2001-02-01

115

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  

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Full Text Available 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.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.

Javiera Cárdenas

2008-01-01

116

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  

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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.

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

117

Morphological Description of a Newly Recorded Strombus luhuanus (Strombidae: Gastropoda from Korea  

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Full Text Available The Strombus Linne, 1758 is a genus of marine mollusks belonging to the class Gastropoda, and is distributed in the tropical waters of the world. Typically, the family Strombidae includes five extant genera (Strombus, Lambis, Terebellum, Tibia, and Rimella, all of which are mostly found in tropical waters. Five individuals of Strombus luhuanus Linne, 1758 were collected from Uljin, Gyeongsangbuk-do province for the first time. In this study, we describe details of shell morphology and radula characters of the species with scanning electron microscopy images of the radula. This is a new record of Strombus luhuanus Linne, 1758 from Korean waters.

Junhee Lee

2013-01-01

118

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  

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

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

2006-12-01

119

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

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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.

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

2011-10-01

120

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  

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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

Bruno S. Sant'Anna

2005-11-01

 
 
 
 
121

Lista preliminar de los Punctoideos de Rio Grande do Sul, Brasil, con descripción de dos especies nuevas (Mollusca, Gastropoda, Stylommatophora) / Preliminar list of the Punctoidea from the State of Rio Grande do Sul, Brazil, with description of two new species (Mollusca, Gastropoda, Stylommatophora)  

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Full Text Available SciELO Brazil | Language: Spanish Abstract in spanish Se presenta una lista parcial de gasterópodos terrestres Punctoideos del "Centro de Pesquisas e Conservação da Natureza Pró-Mata" (São Francisco de Paula, Estado de Rio Grande do Sul, Brazil) (CPCN-PM). Esta lista incluye siete especies, dos de ellas son nuevas. El CPCN-PM se localiza entre los 600 [...] y 950 m de altitud; presenta clima templado superhúmedo a húmedo, lluvias de 2.250 mm anuales y temperatura promedio anual de 14,5ºC; están presentes tres regiones fitoecológicas principales, floresta ombrófila mixta, floresta ombrófila densa y sabana. Los taxones hallados son: Rotadiscus amancaezensis (Hidalgo, 1869), Lilloiconcha tucumana (Hylton Scott, 1963), Radiodiscus cuprinus Fonseca & Thomé, 2000, Radiodiscus tenellus Hylton Scott, 1957, Radiodiscus promatensis sp. nov., Zilchogyra gordurasensis (Thiele, 1927) y Zilchogyra zulmae sp. nov. La conchilla de R. promatensis sp. nov. es muy pequeña, casi plana, con ombligo muy desarrollado, abertura reniforme, con estrías espirales en la teleoconcha y 58-62 costillas axiales en el último anfracto. La conchilla de Z. zulmae sp. nov. es troquiforme alta, con cinco anfractos con fuertes y espaciadas costillas axiales (25-38), ombligo amplio y perspectivo y abertura subcircular angulosa. La fauna de gasterópodos carópidos del CPCN-PM tiene tres especies conocidas sólo del área (R. cuprinus, R. promatensis sp. nov. y Z. zulmae sp. nov.), una, que se distribuye también en Paraguay (R. tenellus) y tres (L. tucumana, R. amancaezensis y Z. gordurasensis), comunes a otras áreas de América del Sur, principalmente la región de las Yungas. Abstract in english The partial list of the land snails Punctoidea from the "Centro de Pesquisas e Conservação da Natureza Pró-Mata" (São Francisco de Paula, State of Rio Grande do Sul, Brazil) (CPCN-PM) is presented herein. This list includes seven species, two of them new. The CPCN-PM is located between 600 and 950 m [...] of altitude; it has a temperate super humid to humid climate, with 2,250 mm of annual rainfall and means annual temperature of 14.5ºC; three main phytoecological regions are present -mixed ombrophile forest, dense ombrophile forest and savanna. The taxa found are: Rotadiscus amancaezensis (Hidalgo, 1869), Lilloiconcha tucumana (Hylton Scott, 1963), Radiodiscus cuprinus Fonseca & Thomé, 2000, Radiodiscus tenellus Hylton Scott, 1957, Radiodiscus promatensis sp. nov., Zilchogyra gordurasensis (Thiele, 1927) and Zilchogyra zulmae sp. nov. The shell of R. promatensis sp. nov. is very small, almost flat, with very wide umbilicus, reniform aperture, teleoconch with spiral striae and 58-62 axial ribs on the body whorl. The shell of Z. zulmae sp. nov. is trochiform elevated, with five whorls with strong and widely spaced axial ribs (25-38), wide and perspective umbilicus and sub circular angled aperture. The charopid gastropod fauna from the CPCN-PM has three species known only from there (R. cuprinus, R. promatensis sp. nov. and Z. zulmae sp. nov.), another one with previous known distribution only in Paraguay (R. tenellus) and three common species (L. tucumana, R. amancaezensis and Z. gordurasensis) with distribution in other South American areas -mainly Yungas forests.

Sergio Eduardo, Miquel; Rina, Ramírez; José Willibaldo, Thomé.

122

Novos registros de Veronicellidae (Gastropoda, Mollusca para Itabuna, Bahia, Brasil e sua ocorrência no conteúdo estomacal de serpentes do gênero Dipsas Laurenti (Colubridae New record for Itabuna, Bahia, Brazil of Veronicellidae (Gastropoda, Mollusca and its occurrence in the stomach contents of snakes Dipsas Laurenti (Colubridae  

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Full Text Available The predominant occurrence of the species Sarasinula marginata (Semper, 1885 in 31 lots, all proceeding from the stomach contents of the snakes Dipsas Laurenri, 1768 was determined. A species still not determined of Novovaginula Thiele, 1931 was represented in 10 lots and in a living collected lot (with only one specimen, not mature. One-third species, Potamojanuarius fuscus (Heynemann, 1885 is represented only in a lot of slugs collected alive (seven specimens and was confirmed in a lot of four specimens, this of the Museum of Zoology, University of São Paulo (USP, São Paulo. All the other lots were sent by F.Q. Alves, Department of Zoology, State University of São Paulo (UNESP, Botucatu, São Paulo.

José Willibaldo Thomé

2001-03-01

123

Lista preliminar de los Punctoideos de Rio Grande do Sul, Brasil, con descripción de dos especies nuevas (Mollusca, Gastropoda, Stylommatophora Preliminar list of the Punctoidea from the State of Rio Grande do Sul, Brazil, with description of two new species (Mollusca, Gastropoda, Stylommatophora  

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Full Text Available Se presenta una lista parcial de gasterópodos terrestres Punctoideos del "Centro de Pesquisas e Conservação da Natureza Pró-Mata" (São Francisco de Paula, Estado de Rio Grande do Sul, Brazil (CPCN-PM. Esta lista incluye siete especies, dos de ellas son nuevas. El CPCN-PM se localiza entre los 600 y 950 m de altitud; presenta clima templado superhúmedo a húmedo, lluvias de 2.250 mm anuales y temperatura promedio anual de 14,5ºC; están presentes tres regiones fitoecológicas principales, floresta ombrófila mixta, floresta ombrófila densa y sabana. Los taxones hallados son: Rotadiscus amancaezensis (Hidalgo, 1869, Lilloiconcha tucumana (Hylton Scott, 1963, Radiodiscus cuprinus Fonseca & Thomé, 2000, Radiodiscus tenellus Hylton Scott, 1957, Radiodiscus promatensis sp. nov., Zilchogyra gordurasensis (Thiele, 1927 y Zilchogyra zulmae sp. nov. La conchilla de R. promatensis sp. nov. es muy pequeña, casi plana, con ombligo muy desarrollado, abertura reniforme, con estrías espirales en la teleoconcha y 58-62 costillas axiales en el último anfracto. La conchilla de Z. zulmae sp. nov. es troquiforme alta, con cinco anfractos con fuertes y espaciadas costillas axiales (25-38, ombligo amplio y perspectivo y abertura subcircular angulosa. La fauna de gasterópodos carópidos del CPCN-PM tiene tres especies conocidas sólo del área (R. cuprinus, R. promatensis sp. nov. y Z. zulmae sp. nov., una, que se distribuye también en Paraguay (R. tenellus y tres (L. tucumana, R. amancaezensis y Z. gordurasensis, comunes a otras áreas de América del Sur, principalmente la región de las Yungas.The partial list of the land snails Punctoidea from the "Centro de Pesquisas e Conservação da Natureza Pró-Mata" (São Francisco de Paula, State of Rio Grande do Sul, Brazil (CPCN-PM is presented herein. This list includes seven species, two of them new. The CPCN-PM is located between 600 and 950 m of altitude; it has a temperate super humid to humid climate, with 2,250 mm of annual rainfall and means annual temperature of 14.5ºC; three main phytoecological regions are present -mixed ombrophile forest, dense ombrophile forest and savanna. The taxa found are: Rotadiscus amancaezensis (Hidalgo, 1869, Lilloiconcha tucumana (Hylton Scott, 1963, Radiodiscus cuprinus Fonseca & Thomé, 2000, Radiodiscus tenellus Hylton Scott, 1957, Radiodiscus promatensis sp. nov., Zilchogyra gordurasensis (Thiele, 1927 and Zilchogyra zulmae sp. nov. The shell of R. promatensis sp. nov. is very small, almost flat, with very wide umbilicus, reniform aperture, teleoconch with spiral striae and 58-62 axial ribs on the body whorl. The shell of Z. zulmae sp. nov. is trochiform elevated, with five whorls with strong and widely spaced axial ribs (25-38, wide and perspective umbilicus and sub circular angled aperture. The charopid gastropod fauna from the CPCN-PM has three species known only from there (R. cuprinus, R. promatensis sp. nov. and Z. zulmae sp. nov., another one with previous known distribution only in Paraguay (R. tenellus and three common species (L. tucumana, R. amancaezensis and Z. gordurasensis with distribution in other South American areas -mainly Yungas forests.

Sergio Eduardo Miquel

2004-12-01

124

Novos registros de Veronicellidae (Gastropoda, Mollusca) para Itabuna, Bahia, Brasil e sua ocorrência no conteúdo estomacal de serpentes do gênero Dipsas Laurenti (Colubridae) / New record for Itabuna, Bahia, Brazil of Veronicellidae (Gastropoda, Mollusca) and its occurrence in the stomach contents of snakes Dipsas Laurenti (Colubridae)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] Abstract in english The predominant occurrence of the species Sarasinula marginata (Semper, 1885) in 31 lots, all proceeding from the stomach contents of the snakes Dipsas Laurenri, 1768 was determined. A species still not determined of Novovaginula Thiele, 1931 was represented in 10 lots and in a living collected lot [...] (with only one specimen, not mature). One-third species, Potamojanuarius fuscus (Heynemann, 1885) is represented only in a lot of slugs collected alive (seven specimens) and was confirmed in a lot of four specimens, this of the Museum of Zoology, University of São Paulo (USP), São Paulo. All the other lots were sent by F.Q. Alves, Department of Zoology, State University of São Paulo (UNESP), Botucatu, São Paulo.

José Willibaldo, Thomé; Sinara Silveira, Santos; Vivian Luciana, Jeske.

125

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)

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.

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.

126

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

Scientific Electronic Library Online (English)

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

Bruno S., Sant' Anna; Cilene M., Zangrande; Alvaro L.D., Reigada.

127

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)

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.

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

128

The mitochondrial genome of the sipunculid Phascolopsis gouldii supports its association with Annelida rather than Mollusca  

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We have determined the sequence of about half (7470 nts) of the mitochondrial genome of the sipunculid Phascolopsis gouldii, the first representative of this phylum to be so studied. All of the 19 identified genes are transcribed from the same DNA strand. The arrangement of these genes is remarkably similar to that of the oligochaete annelid Lumbricus terrestris. Comparison of both the inferred amino acid sequences and the gene arrangements of a variety of diverse metazoan taxa reveals that the phylum Sipuncula is more closely related to Annelida than to Mollusca. This requires reinterpretation of the homology of several embryological features and of patterns of animal body plan evolution.

Boore, Jeffrey L.; Staton, Joseph

2001-09-01

129

Crystallization in organo-mineral micro-domains in the crossed-lamellar layer of Nerita undata (Gastropoda, Neritopsina).  

Science.gov (United States)

Crossed-lamellar shell microstructure consists of a sophisticated arrangement of interspersed lamellae, which is very commonly found in Gastropoda or Bivalvia shell layers. Its smallest constitutive microstructural units are usually described as sub-micrometric fibers, or rods, and form very ordered and regular patterns. Atomic force microscopy (AFM) and transmission electron microscopy (TEM) imaging confirms the presence of even smaller building units in the form of organo-mineral granules, and we further investigate their internal structure within aragonite crossed-lamellar internal layer of Nerita undata (Gastropoda, Neritopsina) shell. Their coalescence may have controlled anisotropically the propagation of the crystallographic coherence through this complex microstructure, as suggested by the propagation of the microtwinning pattern between neighboring granules. PMID:22178222

Nouet, Julius; Baronnet, Alain; Howard, Lauren

2012-02-01

130

50 CFR 665.421 - Definitions.  

Science.gov (United States)

...Tubipora. Ahermatypic corals Azooxanthellates. Sea cucumbers, Sea urchins (Those species not listed as CHCRT) Echinoderms.Mollusca. Sea snails Gastropoda. Turban shells Trochus spp. Sea slugs Opistobranchs. Black lipped...

2010-10-01

131

50 CFR 665.621 - Definitions.  

Science.gov (United States)

...as CHCRT Mollusca. sea snails Gastropoda. Trochus...lipped pearl oyster Pinctada...clams Other Bivalves. Cephalopods...CMUS) Crustaceans. Sponges...plants, invertebrates, and fishes...bottomfish, crustacean,...

2010-10-01

132

50 CFR 665.121 - Definitions.  

Science.gov (United States)

...Zoanthinaria.Mollusca. sisi-sami...snails Gastropoda. aliao...lipped pearl oyster Pinctada...clams Other Bivalves. ula...listed as Crustacean MUS) Crustaceans. sea squirts...plants, invertebrates, and fishes...bottomfish, crustacean,...

2010-10-01

133

50 CFR Appendix A to Part 622 - Species Tables  

Science.gov (United States)

...Annelida A. Polychaetes—Class Polychaeta Family...Phylum Mollusca A. Gastropods—Class Gastropoda Family...tongue B. Bivalves—Class Bivalvia...Atlantic thorny oyster C. Cephalopods...Arthropoda A....

2010-10-01

134

50 CFR 665.421 - Definitions.  

Science.gov (United States)

...Echinoderms.Mollusca. Sea snails Gastropoda. Turban...lipped pearl oyster Pinctada...Clams Other Bivalves. Mushroom...CMUS) Crustacea. Lace...plants, invertebrates, and fishes...bottomfish, crustacean,...

2010-10-01

135

Ultrastructural developmental cycle of Haplosporidium montforti (phylum Haplosporidia) in its farmed abalone host, Haliotis tuberculata (Gastropoda).  

Science.gov (United States)

The sequential developmental cycle of Haplosporidium montforti, a recently described species from farmed abalone Haliotis tuberculata (Gastropoda), was studied. Ornamented and operculated mature spores were electron dense. The nucleus of the uninucleated free cell divided successively, giving rise to multinucleate plasmodia, containing up to 100-120 nuclei. Later, the plasmodia developed into sporonts inside sporocysts with irregular contours. Each of their nuclei gave rise to uninucleate sporoblasts. At the next phase of development, a very irregular membranous group of cisternae began to differentiate in the cytoplasm of each sporoblast, surrounding each nucleus and the adjacent cytoplasm. Each sporoblast differentiated into a spore. This process was characterized by the appearance of dense blisters of amorphous material at the periphery that gradually formed the prespore wall and pre-operculum. Simultaneously, in the endosporoplasm, the spherulosome and several haplosporosomes were formed. During the final phase of the maturation process, the spores became gradually denser, and the endosporoplasmic structures were barely visible. PMID:18372632

Azevedo, Carlos; Casal, Graça; Montes, Jaime

2008-02-01

136

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

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

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

2008-03-30

137

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

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

Pedro, Romero; Rina, Ramírez.

2011-08-01

138

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

Scientific Electronic Library Online (English)

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

Pedro, Romero; Rina, Ramírez.

139

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

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

Bros, V.

2006-11-01

140

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

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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.

Pedro Romero

2011-08-01

 
 
 
 
141

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

Science.gov (United States)

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

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

2013-01-01

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A review of the non-bulimulid terrestrial Mollusca from the Region of Atacama, northern Chile.  

Science.gov (United States)

Terrestrial mollusca are sparsely studied in Chile and, for the first time, a formal record of the diversity of land snails in northern Chile is reported. Coastal and desertic areas in the Region of Atacama, in the border of the Atacama desert and the Pacific Ocean, were surveyed with the aim to describe the presence and distribution of this poorly known fauna. Of the fourteen species recorded, the geographic distribution records for nine species are extended, and some taxa are recorded for the first time since their original descriptions. All, except one, of the fourteen terrestrial molluscan species occurring in the area are endemic to Chile; they are all terrestrial species, most of them have a restricted geographic distribution, and none of them is currently protected by law. The results reveal that the region of Atacama has one of the most diverse terrestrial snail biodiversity in Chile, ranking only after the Juan Fernandez Archipelago. Distribution records of all the studied species and a taxonomic key are also provided. PMID:24715800

Araya, Juan Francisco; Catalán, Ricardo

2014-01-01

143

Mitogenome of the small abalone Haliotis diversicolor Reeve and phylogenetic analysis within Gastropoda.  

Science.gov (United States)

The complete mitochondrial coding regions of three small abalones Haliotis diversicolor Reeve, two collected from Vietnam and one from southern China, were successfully sequenced. The molecular feature of the mitochondrial genome is identical with the general description of the family Haliotidae mtDNAs that have been sequenced so far. The sequenced nucleotides are 16,186-16,266bp in length. The mitogenome encodes 13 protein-coding genes, 2 ribosomal RNA genes, and 22 transfer RNA genes. Between adjacent genes trnH and nad5 there is an overlapping region. Comparison of the ratios of Ka and Ks among four species of Haliotis (H. diversicolor, H. discus hannai, H. rubra and H. tuberculata tuberculata) reveals that values of Ka/Ks in some NADH dehydrogenase and ATPase genes such as nad2, nad6 and atp8 are higher than those in other mitochondrial genes. Genome-wide gene arrangement among four species of Haliotis has been compared. Although all gene arrangement is the same in H. diversicolor, H. discus hannai and H. rubra, the location of trnS? and trnF in H. tuberculata tuberculata are inter-exchanged. Both gene arrangement and phylogenetic analysis support that the family Haliotidae is at a relatively primordial phylogenetic position in Gastropoda. Through alignment between Vietnam and southern China individuals, 111 SNPs are detected, most SNPs are synonymous mutations, and 7, 94 and 10 SNPs are observed at NCR, protein-coding region and RNA region, respectively. The result of SNP analysis also demonstrates that the difference is mainly in some NADH dehydrogenase genes between the Vietnam and southern China individuals. PMID:22118637

Xin, Yi; Ren, Jianfeng; Liu, Xiao

2011-12-01

144

Pyramidellidae (Mollusca, Gastropoda, Heterobranchia) collected during the Dutch CANCAP and MAURITANIA expeditions in the south-eastern part of the North Atlantic Ocean (part 1). CANCAP-project. Contributions, no. 119  

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The species of the Pyramidellidae collected during several expeditions in the south-eastern part of the North Atlantic Ocean are listed, with locality data, depth ranges, and notes on nomenclature, systematics and distribution. The samples classified with the genera Pyramidella, Tiberia, Adelactaeon, Odetta, Folinella, Ondina, Odostomia, Puposyrnola and Eulimella (partly) are dealt with in this paper. In total 64 species are reported from the research area, 32 of which are described as new to...

Aartsen, J. J.; Gittenberger, E.; Goud, J.

1998-01-01

145

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

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

Xavier Cucherat

2010-01-01

146

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  

Scientific Electronic Library Online (English)

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

Rafael Lucyk, MAURER; Carlos, GRAEFF-TEIXEIRA; José Willibaldo, THOMÉ; Luís Antônio, CHIARADIA; Hiroko, SUGAYA; Kentaro, YOSHIMURA.

147

Výsledky pr?zkumu m?kkýš? (Mollusca: Gastropoda, Bivalvia v okolí m?sta Blatná v jihozápadních ?echách Results of the faunistic survey of molluscs in the vicinity of Blatná town in south-western Bohemia  

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Full Text Available Results of the faunistic survey on molluscs in the vicinity of the town of Blatná (south-western Bohemia, Czech Republic are presented. This research was carried out in 2004–2007 at 28 sites complemented by other older unpublished records. Altogether 87 species (76 gastropods, 11 bivalves have been recorded that the freshwater molluscs represented the most abundant ecological group in this region (about 40% of all species recorded. However, the rare species (e.g. Aplexa hypnorum, Physa fontinalis, Pisidium obtusale have been found usually in small water bodies while the majority of common freshwater molluscs was recorded predominantly in large and mid-sized ponds. The snail Gyraulus acronicus is the rarest freshwater species found only at one locality. Important proportion of investigated malacofauna consisted of wetland and floodplain species with rare elements such as Vertigo antivertigo, V. substriata, Euconulus praticola or even V. angustior, the former being protected in the whole Europe. Occurrence of this endangered species in the studied region represents one of the most important clusters of its populations in Bohemia. Only several forest species have been recorded, the species Acanthinula aculeata and Vertigo pusilla are of particular importance. Unique are finds of the steppe species Chondrula tridens on old slacking walls in the town of Blatná.

Jaroslav ?. Hlavá?

2008-04-01

148

The presence of live specimens of Monacha cartusiana (O.F. Müller, 1774) and Cernuella virgata (Da Costa, 1778) (Mollusca, Gastropoda, Hygromiidae) has prevented the import of 23 tons of apples from France into Israel  

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The discovery of several living specimens of Monacha cartusiana and Cernuella virgata in a shipment of some 23 tons of hand apples from France to Israel resulted in a decision by the Plant Protection & Inspection Services of the Ministry of Agriculture in Israel to return the entire shipment to France. The reason for this decision was triggered by the status of Cernuella virgata as being a potentially pest species.

Mienis, Henk K.; Svetlana Vaisman

2010-01-01

149

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

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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.

Boore, Jeffrey L.

2005-12-01

150

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

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

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

2011-03-01

151

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

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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.

Cedar I García-Ríos

2011-03-01

152

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

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

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

153

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

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

Roberto Zamora-Bustillos

2011-09-01

154

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

Scientific Electronic Library Online (English)

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

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

155

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  

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Full Text Available 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.

Claudia R.S. de Lira

2000-12-01

156

Análise comparativa do conteúdo Filo Mollusca em livro didático e apostilas do ensino médio de Cascavel, Paraná / Comparative analysis of the Phylum Mollusca contents in a high school instructional book and in teacher's notes/handouts at Cascavel, Paraná, Brazil  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese O objetivo deste trabalho foi realizar uma análise comparativa entre um livro didático de Biologia utilizado na terceira série do Ensino Médio, da rede estadual de ensino do município de Cascavel, PR, e apostilas utilizadas por duas escolas da rede privada. Após o levantamento e escolha, os materiai [...] s didáticos foram submetidos a uma análise geral em relação à capa, encadernação, espaçamento entre linhas, tamanho da letra, ilustrações, quadros e tabelas, e, também, a uma análise específica do conteúdo Filo Mollusca, considerando-se conceitos; sugestões de leituras complementares; erros ortográficos e conceituais; erros de impressão e revisão; ilustrações. Verificou-se que todos os materiais didáticos analisados apresentam falhas. No entanto, em umas das apostilas, foram encontradas mais falhas, pois além do seu conteúdo ser extremamente sucinto e não apresentar um planejamento em relação às atividades propostas, continha imagens incorretas e sem legendas auto-explicativas. Abstract in english The objective of this work was to carry out a comparative analysis between an instructional Biology book used in the junior year of high school in the school network system of the State of Paraná at the municipality of Cascavel, PR, and teacher's notes/handouts used by two schools in the private sch [...] ool network. After surveying and selecting the materials, these were submitted to a general analysis with regard to their cover, binding, line spacing, font size, illustrations, charts and tables, and also to a specific analysis in relation to their Phylum Mollusca contents, in which concepts, supplementary reading suggestions, typos and conceptual errors, printing and proofreading errors, and illustrations were taken into consideration. It was observed that all learning materials analyzed showed imperfections; however, a higher number of imperfections was found in one set of teacher's notes, because besides having an extremely succinct content and not presenting any planning in relation to the proposed activities, it contained incorrect images without self-explanatory labels.

Juliana Cristina dos, Santos; Luis Francisco Angeli, Alves; João Jorge, Corrêa; Everton Ricardi Lozano, Silva.

2007-12-01

157

Análise comparativa do conteúdo Filo Mollusca em livro didático e apostilas do ensino médio de Cascavel, Paraná / Comparative analysis of the Phylum Mollusca contents in a high school instructional book and in teacher's notes/handouts at Cascavel, Paraná, Brazil  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese O objetivo deste trabalho foi realizar uma análise comparativa entre um livro didático de Biologia utilizado na terceira série do Ensino Médio, da rede estadual de ensino do município de Cascavel, PR, e apostilas utilizadas por duas escolas da rede privada. Após o levantamento e escolha, os materiai [...] s didáticos foram submetidos a uma análise geral em relação à capa, encadernação, espaçamento entre linhas, tamanho da letra, ilustrações, quadros e tabelas, e, também, a uma análise específica do conteúdo Filo Mollusca, considerando-se conceitos; sugestões de leituras complementares; erros ortográficos e conceituais; erros de impressão e revisão; ilustrações. Verificou-se que todos os materiais didáticos analisados apresentam falhas. No entanto, em umas das apostilas, foram encontradas mais falhas, pois além do seu conteúdo ser extremamente sucinto e não apresentar um planejamento em relação às atividades propostas, continha imagens incorretas e sem legendas auto-explicativas. Abstract in english The objective of this work was to carry out a comparative analysis between an instructional Biology book used in the junior year of high school in the school network system of the State of Paraná at the municipality of Cascavel, PR, and teacher's notes/handouts used by two schools in the private sch [...] ool network. After surveying and selecting the materials, these were submitted to a general analysis with regard to their cover, binding, line spacing, font size, illustrations, charts and tables, and also to a specific analysis in relation to their Phylum Mollusca contents, in which concepts, supplementary reading suggestions, typos and conceptual errors, printing and proofreading errors, and illustrations were taken into consideration. It was observed that all learning materials analyzed showed imperfections; however, a higher number of imperfections was found in one set of teacher's notes, because besides having an extremely succinct content and not presenting any planning in relation to the proposed activities, it contained incorrect images without self-explanatory labels.

Juliana Cristina dos, Santos; Luis Francisco Angeli, Alves; João Jorge, Corrêa; Everton Ricardi Lozano, Silva.

158

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)

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.

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

159

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

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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.

Lenin Arias-Rodriguez

2007-12-01

160

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

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

Luiz Ricardo L., Simone.

 
 
 
 
161

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

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

Setuko, Masunari.

162

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)  

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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.

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

2013-11-01

163

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

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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.

María José Miranda

2010-09-01

164

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

Scientific Electronic Library Online (English)

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.

María José, Miranda; María Gabriela, Cuezzo.

165

Kadmium in Valsbaai: moniteringspotensiaal van die mariene slak, Oxystele tigrina (Mollusca  

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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.

 

Abstract

Cadmium in False Bay: Monitoring potential of the marine snail, Oxystele tigrina (Mollusca 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 precipit

Koot Reinecke

2009-09-01

166

The linked units of 5S rDNA and U1 snDNA of razor shells (Mollusca: Bivalvia: Pharidae)  

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The linkage between 5S ribosomal DNA and other multigene families has been detected in many eukaryote lineages, but whether it provides any selective advantage remains unclear. In this work, we report the occurrence of linked units of 5S ribosomal DNA (5S rDNA) and U1 small nuclear DNA (U1 snDNA) in 10 razor shell species (Mollusca: Bivalvia: Pharidae) from four different genera. We obtained several clones containing partial or complete repeats of both multigene families in which both types o...

Vierna, J.; Jensen, K. T.; Marti?nez-lage, A.; Gonza?lez-tizo?n, A. M.

2011-01-01

167

Reproducción, dieta y pesquería del pulpo Octopus (Octopus) hubbsorum (Mollusca: Cephalopoda) en la costa de Oaxaca, México  

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Full Text Available SciELO Costa Rica | Language: Spanish Abstract in spanish Se analizan algunos aspectos de la biología y pesquería de Octopus hubbsorum capturado por pesca artesanal en Puerto Ángel, Oaxaca, México. Las muestras se obtuvieron de enero 2002 a noviembre 2003 con una periodicidad quincenal. A cada uno de los organismos se les registró la longitud dorsal del ma [...] nto (LDM), peso total, sexo y estado de madurez gonádica. Asímismo se obtuvo el Índice Gonadosomático (IGS). Para el análisis del contenido estomacal se utilizaron los índices de frecuencia de presencia y vaciado. Se analizaron 352 organismos, con un intervalo de tallas de 4 a 19 cm LDM; la proporción de sexos fue diferente de 1 (.2= 24.2, p Abstract in english Reproduction, diet and fishery of Octopus (Octopus) hubbsorum (Mollusca: Cephalopoda) in the coast of Oaxaca, Mexico. The octopus Octopus hubbsorum (Berry 1953) ranges widely and is important for the artisanal fishery in Puerto Angel, Oaxaca, Mexico. Samples were taken approximately at every two wee [...] ks from January 2002 to November 2003. All organisms were measured for dorsal mantle length (DLM) and total weight; sex and maturity gonadic stage were registered. For the stomach content analysis, frequency of occurrence and emptying indexes were used. The 352 organisms caught ranged from 4 to 18 cm in DLM; the sex ratio was different from 1 (X² = 24.2, p

Maria del Carmen, Alejo-Plata; José Luis, Gómez-Márquez; Samuel, Ramos Carrillo; Jorge Eduardo, Herrera- Galindo.

168

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

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

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

2007-11-01

169

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  

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

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

2009-06-01

170

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  

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

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

171

El viaje del Prof. Emil A. Rossmässler en 1853 por España y la localidad tipo de Iberus angustatus (Rossmässler, 1854 (Gastropoda, Helicidae  

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Full Text Available The journey of Prof. Emil A. Rossmässler in 1853 in Spain and the type locality of Iberus angustatus (Rossmässler, 1854 (Gastropoda, Helicidae We have identified the type locality of Helix Guiraoana var. angustata Rossmässler, 1854 as ‘located in the heights surrounding the Venta del Molinillo near the Sierra de los Dientes de la Vieja, Diezma, Granada’, from the description given by Rossmässler about his journey in the south east of Spain in 1853. The molecular analysis (COI and 16S of a topotype collected live allowed us to confirm the identification of clade 4 of the genus Iberus proposed by Elejalde et al. (2008 with H. Guiraoana var. angustata, currently I. angustatus.

Martínez–Ortí, A.

2013-12-01

172

Screening of antiangiogenic potential of twenty two marine invertebrate extracts of phylum Mollusca from South East Coast of India  

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Objective To evaluate the antiangiogenic potential of twenty two marine invertebrate species of Phylum Mollusca from south east coast of India. Methods Live specimens of molluscan species were collected and their methanolic extracts were evaluated for preliminary antiangiogenic activity using the in ovo chick chorio-allantoic membrane assay. The extracts were further evaluated for in vivo antiangiogenic activity using chemical cautery induced corneal neovascularization assay in rats and oxygen induced retinopathy assay in rat pups. Results In the chick chorio-allantoic membrane assay, four methanolic extracts of marine molluscan species viz. Meretrix meretrix, Meretrix casta, Telescopium telescopium and Bursa crumena methanolic extracts exhibited noticeable antiangiogenic activity at the tested concentration of 200 µg whereby they significantly inhibited the VEGF induced proliferation of new blood vessels. Among these four extracts, the methanolic extract of Meretrix casta exhibited relatively higher degree of antiangiogenic activity with an inhibitiory percentage (64.63%) of the VEGF induced neovascularization followed by the methanolic extracts of Telescopium telescopium (62.02%), Bursa crumena (60.48%) and Meretrix meretrix (47.01%). These four methanolic extracts were further evaluated for in vivo antiangiogenic activity whereby the methanolic extract of Telescopium telescopium exhibited most noticeable inhibition (42.58%) of the corneal neovascularization in rats in comparison to the sham treated group, and also exhibited most noticeable inhibition (31.31%) of the oxygen induced retinal neovascularization in rat pups in comparison to the hyperoxia group that was observed for considerable retinal neovascularization. Conclusions The significant antiangiogenic activity evinced by the extract of Telescopium telescopium merits further investigation for ocular neovascular diseases.

Gupta, Pankaj; Arumugam, Muthuvel; Azad, Raj Vardhan; Saxena, Rohit; Ghose, Supriyo; Biswas, Nihar Ranjan; Velpandian, Thirumurthy

2014-01-01

173

50 CFR 665.221 - Definitions.  

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...Echinoderms.Mollusca. ko`a...as CMUS) Crustaceans. Hydrozoans...black-lip pearl oyster Pinctada...clams Other Bivalves. sea squirts...sea snails Gastropoda. sea slugs...marine plants, invertebrates, and fishes...bottomfish, crustacean, precious coral, seamount groundfish or...

2010-10-01

174

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

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

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

1069-10-01

175

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

Scientific Electronic Library Online (English)

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

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

176

Fast evolving 18S rRNA sequences from Solenogastres (Mollusca resist standard PCR amplification and give new insights into mollusk substitution rate heterogeneity  

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Full Text Available Abstract Background The 18S rRNA gene is one of the most important molecular markers, used in diverse applications such as molecular phylogenetic analyses and biodiversity screening. The Mollusca is the second largest phylum within the animal kingdom and mollusks show an outstanding high diversity in body plans and ecological adaptations. Although an enormous amount of 18S data is available for higher mollusks, data on some early branching lineages are still limited. Despite of some partial success in obtaining these data from Solenogastres, by some regarded to be the most "basal" mollusks, this taxon still remained problematic due to contamination with food organisms and general amplification difficulties. Results We report here the first authentic 18S genes of three Solenogastres species (Mollusca, each possessing a unique sequence composition with regions conspicuously rich in guanine and cytosine. For these GC-rich regions we calculated strong secondary structures. The observed high intra-molecular forces hamper standard amplification and appear to increase formation of chimerical sequences caused by contaminating foreign DNAs from potential prey organisms. In our analyses, contamination was avoided by using RNA as a template. Indication for contamination of previously published Solenogastres sequences is presented. Detailed phylogenetic analyses were conducted using RNA specific models that account for compensatory substitutions in stem regions. Conclusions The extreme morphological diversity of mollusks is mirrored in the molecular 18S data and shows elevated substitution rates mainly in three higher taxa: true limpets (Patellogastropoda, Cephalopoda and Solenogastres. Our phylogenetic tree based on 123 species, including representatives of all mollusk classes, shows limited resolution at the class level but illustrates the pitfalls of artificial groupings formed due to shared biased sequence composition.

Mikkelsen Nina T

2010-03-01

177

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

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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.

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

2014-10-01

178

Reproducción, dieta y pesquería del pulpo Octopus (Octopus hubbsorum (Mollusca: Cephalopoda en la costa de Oaxaca, México  

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Full Text Available Se analizan algunos aspectos de la biología y pesquería de Octopus hubbsorum capturado por pesca artesanal en Puerto Ángel, Oaxaca, México. Las muestras se obtuvieron de enero 2002 a noviembre 2003 con una periodicidad quincenal. A cada uno de los organismos se les registró la longitud dorsal del manto (LDM, peso total, sexo y estado de madurez gonádica. Asímismo se obtuvo el Índice Gonadosomático (IGS. Para el análisis del contenido estomacal se utilizaron los índices de frecuencia de presencia y vaciado. Se analizaron 352 organismos, con un intervalo de tallas de 4 a 19 cm LDM; la proporción de sexos fue diferente de 1 (.2= 24.2, pReproduction, diet and fishery of Octopus (Octopus hubbsorum (Mollusca: Cephalopoda in the coast of Oaxaca, Mexico. The octopus Octopus hubbsorum (Berry 1953 ranges widely and is important for the artisanal fishery in Puerto Angel, Oaxaca, Mexico. Samples were taken approximately at every two weeks from January 2002 to November 2003. All organisms were measured for dorsal mantle length (DLM and total weight; sex and maturity gonadic stage were registered. For the stomach content analysis, frequency of occurrence and emptying indexes were used. The 352 organisms caught ranged from 4 to 18 cm in DLM; the sex ratio was different from 1 (X² = 24.2, p<0.05 throughout the year. The maximum values of the GSI appeared in May (4.1917 for females; 1.2675 in males. LDM for first sexual maturity (LDM50% was 16 cm (females and 14 cm (males. Octopus hubbsorum moves from deep waters to the coast, probably in search of better conditions, and lays masses of eggs on rocky substrata. They are fished from March to October, with higher intensity in April and May. Fishing effort was related to the oceanographic characteristics and the atmospheric conditions of the area. From April to September the CPUE monthly mean was 20-10 kg/divers/day. Using the CPUE and environmental condition relationship, the estimated adequate superficial temperature for fishing is 29.5 °C. Rev. Biol. Trop. 57 (1-2: 63-78. Epub 2009 June 30.

Maria del Carmen Alejo-Plata

2009-06-01

179

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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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.

Rivera–Ingraham, G. A.

2011-01-01

180

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  

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

Oscar RAVERA

2005-08-01

 
 
 
 
181

Salida de campo a la finca de Bárbara (Valladolid) el 17 de agosto de 1952  

Digital Repository Infrastructure Vision for European Research (DRIVER)

Salida de campo a la finca de Bárbara (seguramente, en las cercanías de Valladolid capital) el 17 de agosto de 1952, de la que se realizaron observaciones sobre el caracol Helix sp. (Gastropoda, Mollusca), el roedor "Pytimis" (llamado así por el autor, siendo posiblemente el actual género Midrotus), los siguientes reptiles: Natrix maura (Culebra viperina, llamada Tropidonotus viperinus por el autor) y Rhinechis scalaris (Culebra de escalera, llamada Elaphe scalaris por el autor) y las si...

Valverde Go?mez, Jose? Antonio

2008-01-01

182

Faunistic assemblages of a sublittoral coarse sand habitat of the northwestern Mediterranean.  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The sublittoral megabenthic assemblages of a northwestern Mediterranean coarse sandy beach exploited for the bivalve Callista chione were studied. The spatial and bathymetric variability of its distinctive faunal assemblages was characterised by quantitative sampling performed with a clam dredge. The taxa studied were Mollusca Bivalvia and Gastropoda, Crustacea Decapoda, Echinodermata and Pisces, which accounted for over 99% of the total biomass. Three well-differentiated species assemblages ...

Pubill, Eva; Abello?, Pere; Ramo?n, Montserrat; Baeta, Marc

2011-01-01

183

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.)

184

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

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Full Text Available 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 contribute to the successful overland translocation of this species. We conducted a laboratory experiment with four levels of air exposure (9, 18, 24 and 36 hours in a controlled climatic chamber. Snails were placed for 60 seconds in a laboratory paper filter to remove surface snail water. Then they were placed back in empty vessels during the four periods of air exposure, except the control group, which was immediately returned to water. At the end of each period of air exposure all vessels were filled with water and the cumulative mortality was monitored after 24, 96, 168 and 264 hours of rehydration. The calculated Lethal Times (i.e. the time of air exposure (in hours necessary to cause the death of 50% (LT50 or 99% (LT99 of the population and their 95% confidence limits at 24, 96, 168 and 264 hours were 28.1 (25.2–31.9, 26.9 (24.2–30.1, 25.9 (23.4–28.9 and 25.9 (23.4–28.9 hours, respectively for LT50, and 49.6 (42.7–63.3, 45.6 (39.9–56.5, 43.2 (38.0–53.0 and 43.2 (38.0–53.0 hours, respectively for LT99. Therefore an air exposure time over 43 hours caused the death of all studied individuals during all monitoring periods. Extending the monitoring period beyond 24 hours did not significantly change lethal times. Therefore, we recommend exposing fishing tools or boats at open air during at least 53 hours as a low cost measure to control mudsnail spread in early stages of invasion.

Alvaro Alonso

2012-08-01

185

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)

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

Patricia E, Romero-Murillo; Jaime, Polanía.

186

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  

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

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

2011-09-01

187

Complete DNA sequence of the mitochondrial genome of the sea-slug, Aplysia californica: conservation of the gene order in Euthyneura.  

Science.gov (United States)

We have sequenced and characterized the complete mitochondrial genome of the sea slug, Aplysia californica, an important model organism in experimental biology and a representative of Anaspidea (Opisthobranchia, Gastropoda). The mitochondrial genome of Aplysia is in the small end of the observed sizes of animal mitochondrial genomes (14,117 bp, NCBI Accession No. NC_005827). The Aplysia genome, like most other mitochondrial genomes, encodes genes for 2 ribosomal subunit RNAs (small and large rRNAs), 22 tRNAs, and 13 protein subunits (cytochrome c oxidase subunits 1-3, cytochrome b apoenzyme, ATP synthase subunits 6 and 8, and NADH dehydrogenase subunits 1-6 and 4L). The gene order is virtually identical between opisthobranchs and pulmonates, with the majority of differences arising from tRNA translocations. In contrast, the gene order from representatives of basal gastropods and other molluscan classes is significantly different from opisthobranchs and pulmonates. The Aplysia genome was compared to all other published molluscan mitochondrial genomes and phylogenetic analyses were carried out using a concatenated protein alignment. Phylogenetic analyses using maximum likelihood based analyses of the well aligned regions of the protein sequences support both monophyly of Euthyneura (a group including both the pulmonates and opisthobranchs) and Opisthobranchia (as a more derived group). The Aplysia mitochondrial genome sequenced here will serve as an important platform in both comparative and neurobiological studies using this model organism. PMID:16230032

Knudsen, Bjarne; Kohn, Andrea B; Nahir, Ben; McFadden, Catherine S; Moroz, Leonid L

2006-02-01

188

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  

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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.

Daiane Aviz

2009-04-01

189

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)

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

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

190

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)

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

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

2011-03-01

191

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)

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

Tamar Koftayan

2011-03-01

192

Naked in toxic fluids: A nudibranch mollusc from hydrothermal vents  

Science.gov (United States)

A new species of the nudibranch genus Dendronotus (Mollusca, Opisthobranchia) is reported from a hydrothermal vent at the Lucky Strike area, on the Mid-Atlantic Ridge. This is the first species of nudibranch recorded with certainty from a vent site. Other species of Dendronotus are distributed in temperate waters on the continental shelf of the northern hemisphere. Two factors that probably account for the occurrence of a nudibranch in this hydrothermal field are that the Lucky Strike area presents potential hydroid prey, and that nudibranchs apparently inhabit a lower activity area. It is hypothesized that the new species, which lacks eyes, is a permanent resident of vent fields on the Mid-Atlantic Ridge, but is probably not restricted to that environment.

Valdés, Ángel; Bouchet, Philippe

1998-01-01

193

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)

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)

Seo, Daniele

2012-07-01

194

Larval development and metamorphosis in Pleurobranchaea maculata, with a review of development in the notaspidea (Opisthobranchia).  

Science.gov (United States)

Pleurobranchaea maculata is a carnivorous notaspidean that is common in New Zealand. This species produces small eggs (diameter 100 microm) and planktotrophic veligers that hatch in 8 d and are planktonic for 3 weeks before settling on biofilmed surfaces (14 degrees C). Larval development is known in detail for only two other notaspidean species, P. japonica and Berthellina citrina. In all three species of pleurobranchids, mantle and shell growth show striking differences from veligers of other opisthobranch taxa. In young veligers of pleurobranchids, the shell is overgrown by the mantle, new shell is added by cells other than those of the mantle fold, and an operculum does not form. Thus some "adult" traits (e.g., notum differentiation, mechanism of shell growth, lack of operculum) are expressed early in larval development. This suggests that apomorphies characteristic of adult pleurobranchids evolved through heterochrony, with expression in larvae of traits typical of adults of other clades. The protoconch is dissolved post-settlement and not cast off as occurs in other opisthobranch orders, indicating that shell loss is apomorphic. P. maculata veligers are atypical of opisthobranchs in having a field of highly folded cells on the lower velar surface, a mouth that is posterior to the metatroch, and a richly glandular, possibly chemodefensive mantle. These data indicate that notaspidean larvae are highly derived in terms of the novel traits and the timing of morphogenic events. Phylogenetic analysis must consider embryological origins before assuming homology, as morphological similarities (e.g., shell loss) may have developed through distinct mechanisms. PMID:14583510

Gibson, Glenys D

2003-10-01

195

Photosynthetic activity of the solar-powered lagoon mollusc Elysia timida (Risso, 1818) (Opisthobranchia: Sacoglossa)  

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The sacoglossan Elysia timida (Risso, 1818) is typical of shallow sea areas and coastal lagoons. It retains symbiotic functional chloroplasts derived from its algal food Acetabularia acetabulum (Linnaeus) for 45 days. However, some aspects of the photosynthetic behaviour of the mollusc-chloroplast association are unknown. This work studies the photosynthetic characteristics of E. timida from a lagoon environment (Mar Menor), defined between 25 and 600 µmol quanta m–2 s–1 by the photosynt...

Gime?nez Casalduero, Francisca; Muniain, Claudia

2006-01-01

196

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)

197

Plesiophysa dolichomastix sp. n. (Gastropoda: Planorbidae)  

Scientific Electronic Library Online (English)

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.

W Lobato, Paraense.

198

Adiciones a los Gastropoda del mar peruano  

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Full Text Available 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.

Carlos Paredes

2011-06-01

199

Plesiophysa dolichomastix sp. n. (Gastropoda: Planorbidae)  

Scientific Electronic Library Online (English)

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.

W Lobato, Paraense.

2002-06-01

200

[Microbiologic depuration of Anadara tuberculosa (Mollusca: Arcidae)].  

Science.gov (United States)

In Costa Rica the mollusk Anadara tuberculosa represents a risk for human health due to the contamination of the growing waters and the fact that its is consumed raw. The families depending on the income obtained through commercialization of these animals have a low education and economic status. Therefore, it is of great importance to develop and evaluate simple methods of depuration that could be easily used by these families to make these mollusks safe for consumption. Bottles containing 11 of saline solution (25g/l) were prepared in duplicates to test the bactericidal effect of acetic acid. The solution in each bottle was adjusted to ph 4.5, 5.0 or 5.5 or held at ph of 7.0 or 8.0 for the controls. The solution in each bottle was then inoculated with approximately 1 X 104 cfu/ml of coliforms. Counts of coliforms were determined for each bottle 0, 1, 2, 4 and 8 hours after inoculation. For the depuration studies, specimens with diameters ranging from 4.0 to 4.5 cm were collected from a harvester at the estuary of Puntarenas, Gulf of Nicoya. Fifty specimens each were depurated in separate tanks containing 25 1 of oxygenated saline solution adjusted with acetic acid to an initial ph of 4.5 (treatment) or non adjusted ph of 8.0 (control). Counts of Enterobacteriaceae were determined, in duplicates, every 12 hr for 48 hr. An additional fifty animals were depurated using the defined method and tested to determine if they met international standards of microbiological quality for aerobic plate count, Enterobacteriaceae count, Escherichia coli count and presence of Salmonella. A sensory evaluation using a triangle test was performed to compare a typical dish prepared with depurated or non-depurated animals. A significant coliform reduction was determined in a saline solution (25 g/l) at a pH range of 4.5 to 5.5. This reduction, during 8 hr, was higher in the acid treatments compared to the controls. During depuration, the elimination of Enterobacteriaceae bacteria was faster when acetic was used (initial ph = 4.5) than when it was not. This elimination was more important the first 24 hr, time defined as adequate for the application of the method. The method has the advantage of transforming the bivalve in a product that is safe for human consumption, since it guarantees that the international standards of microbiological quality, for raw and depurated mollusks, are reached. On the other hand, the sensory qualities of a typical dish prepared with depurated animals are not affected by the method, which can be easily implemented and applied by the people that work in the extraction of this mollusk. PMID:9698943

Wong, E; Antillón, F; Glenn, E; González, M I

1997-12-01

 
 
 
 
201

Serotonin-like immunoreactivity in the central and peripheral nervous systems of the interstitial acochlidean Asperspina sp. (Opisthobranchia).  

Science.gov (United States)

Species of Acochlidea are common members of the marine interstitial environment and defined in part by their minuscule size and highly divergent morphology relative to other benthic opisthobranchs. Despite these differences, acochlideans such as species of Asperspina display many plesiomorphic characteristics, including an unfused condition of their neural ganglia. To gain insight into the distribution of specific neural subsets within acochlidean ganglia, a species of Asperspina was studied by using anti-serotonin immunohistochemistry and epifluorescence and confocal laser scanning microscopy. Results reveal similarities between Asperspina and larger opisthobranchs in the general distribution of serotonergic perikarya in the central nervous system. Specifically, the arrangement of perikarya into regional clusters within the cerebral and pedal ganglia and the absence of immunoreactive perikarya in the pleural ganglia are similar to the model species of Aplysia californica, Pleurobranchaea californica, and Tritonia diomedea. Moreover, serotonergic innervation of the rhinophores in all opisthobranchs, including Asperspina sp., originates from the cerebral ganglion instead of directly from the rhinophoral ganglion. Serotonergic innervation of the body wall, including the epithelium, muscles, and pedal sole, appears to arise exclusively from pedal and accessory ganglia. These observations indicate a general conservation of serotonin-like immunoreactivity in the central and peripheral nervous systems of acochlidean and other benthic opisthobranchs. PMID:17679719

Hochberg, Rick

2007-08-01

202

Biomonitoring of Fresh Water of Loktak Lake, India  

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Full Text Available The fresh water Mollusca (Scientific name; Pila globosa was collected from nine differentstations of Loktak lake to investigate the elemental profile in the tissue of it as it can beused as biomonitor of the pollution of water. As the Gastropoda family is a feeder filter, itis very useful to examine the trace elements as well as toxic elements in the environmentwhere it survives. The elements detected in the samples are Mg, Al, P, S, Cl, K, Ca, Mn,Fe, Cu, Zn, Se, Br, Rb, Sr and the elemental concentrations were compared with FAOlimits to check their toxic levels. The elements detected so far are the time integral of theirconcentration so, that are several orders of magnitude above ambient waterconcentrations. The analysis of the elements was done with the help of energy dispersiveX-ray fluorescence (EDXRF for its quick and multi-elemental detection capability. Keywords: Pila globosa, Biomonitoring, Loktak lake, Trace elements, EDXRF

N.K. Sharat Singh

2014-02-01

203

[Macrogeographic genetic variability in the gastropod mollusk Littorina sitkana from the northwest Pacific].  

Science.gov (United States)

Variation at four highly polymorphic allozyme loci (inorganic pyrophosphatase, peptidase, and two esterase loci) was examined in 25 settlements of the marine snail Littorina sitkana (Mollusca, Gastropoda). The sampling localities covered a wide part of the species range: from the Peter the Great Bay (the Sea of Japan) at the southwest to the Mednyi Island (Commander Islands) at the northeast. Like other littorines lacking the pelagic stage, L. sitkana was characterized by significant genetic differentiation (G(ST) for the pooled sample was 0.310). Cluster analysis and nonmetric multidimensional scaling conducted on a matrix of pairwise genetic distances between all of the settlements studied revealed four genetically different groups: southern Primorye, northern Prymorye, Sakhalin, and Kuril-Commanders. The population-genetic structure of the L. sitkana settlements is close to that described by the isolation-by-distance and stepping-stone models: the geographic and the genetic distances between the most settlements examined are distinctly correlated. PMID:15865293

Zaslavskaya, N I; Pudovkin, A I

2005-03-01

204

Diet of Lipophrys pholis (L.) (Teleostei, Blenniidae) in Cantabrian coastal waters (Spain)  

Science.gov (United States)

Between February and December 1988, a total of 261 specimens of Lipophrys pholis were caught in eleven intertidal pools on the western coast of Asturias. This blenniid species mainly feeds on different groups of invertebrates, although algal remains also appear. Mollusca is the most highly represented taxon with the largest number of prey being Gastropoda, followed by Bivalvia and, to a lesser degree, Polyplacophora. Crustacea is well represented by Cirripedia. Isopoda also stands out and Amphipoda, Tanaidacea and Decapoda appear sporadically. Temporal diet analysis throughout the year shows no great differences. Likewise, a great similarity was observed among the feeding of L. pholis specimens collected in pools at a different tidal level, of variable size and with different algal cover. Changes in diet are appreciable as size increases, especially from a length of 6 cm on.

Mazé, Raquel A.; Domínguez, Josefa; Pérez-Cardenal, David

1999-07-01

205

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

Directory of Open Access Journals (Sweden)

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.

E.N. Ezekiel

2011-04-01

206

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

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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.

Leal-Zanchet Ana Maria

2003-01-01

207

Gastrocopta iheringi (Suter, 1900 (Gastropoda, Vertiginidae: redescription of type material  

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Full Text Available The holotype of Gastrocopta iheringi (Suter, 1900 was redescribed, illustrated and its identity was confirmed. The goal of this work was to elucidate questions relating to the identification of micromollusks in the genus Gastrocopta Wollaston, 1878.

Inga L. Veitenheimer-Mendes

2012-03-01

208

Silurian gastropoda from southeastern and west-central Alaska  

Science.gov (United States)

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.

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

2008-01-01

209

Silurian Gastropoda from the Alexander terrane, southeast Alaska  

Science.gov (United States)

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.

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

2008-01-01

210

Reproduction of Omalonyx matheroni (Gastropoda: Succineidae under laboratory conditions  

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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 conditions. 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<0.001. Regarding the influences of temperatura and photoperiod on reproductive parameters, under natural environmental conditions, individuals produced a greater number of eggs per mass (ANOVA: F2,573=84.15, p<0.001, with a longer incubation period (ANOVA: F2;559=170.05, p<0.001. The extreme photoperiod conditions of 24 hours of light or zero hours of light likely imposed stress and could be related to the significant reductions in the number of eggs per mass, and egg incubation period as well as the increased synchrony in egg hatching. No correlations were observed between the number of unviable eggs per mass and the temperature, photoperiod (ANOVA: F2,573=0.87, p=0.92 or rearing density (ANOVA: F1,573=0.21, p=0.64. Individuals reared in isolation under natural conditions produced more eggs per mass and did not presented any disadvantage with respect to the variables analyzed as compared to the animals reared in groups. These results indicate that O. matheroni can successfully reproduce by selfing. Rev. Biol. Trop. 60 (2: 553-566. Epub 2012 June 01.

Lângia Montresor

2012-06-01

211

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

Scientific Electronic Library Online (English)

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

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

212

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

Science.gov (United States)

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 conditions. 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: 25degreeC, 24 hours of light; B: environmental conditions of temperature and photoperiod, characterized as follows: average maximum temperature=27.1 degreeC, average minimum temperature=18.3 degreeC, average day length=12.06 hours; and C: 25 degreeC, 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<0.001). Regarding the influences of temperature and photoperiod on reproductive parameters, under natural environmental conditions, individuals produced a greater number of eggs per mass (ANOVA: F2573,=84.15, p<0.001), with a longer incubation period (ANOVA: F2559=170.05, p<0.001). The extreme photoperiod conditions of 24 hours of light or zero hours of light likely imposed stress and could be related to the significant reductions in the number of eggs per mass, and egg incubation period as well as the increased synchrony in egg hatching. No correlations were observed between the number of unviable eggs per mass and the temperature, photoperiod (ANOVA: F2573=0.87, p=0.92) or rearing density (ANOVA: F1 .573=0.21, p=0.64). Individuals reared in isolation under natural conditions produced more eggs per mass and did not presented any disadvantage with respect to the variables analyzed as compared to the animals reared in groups. These results indicate that O. matheroni can successfully reproduce by selfing. PMID:23894928

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

2012-06-01

213

First records of Cecilioides tumulorum (Gastropoda: Ferussaciidae in Bulgaria  

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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.

Dilian Georgiev

2013-10-01

214

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  

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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.

Maria Cristina Pons da Silva

2004-06-01

215

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

Science.gov (United States)

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

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

2014-09-01

216

Familia Ellobiidae (Gastropoda: Archaeopulmonata en el litoral peruano  

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

Carlos Paredes

2013-05-01

217

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

Scientific Electronic Library Online (English)

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

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

218

A review of the Veronicellidae from Mexico (Gastropoda: Soleolifera) / Revisión de los Veronicellidae de México (Gastropoda: Soleolifera)  

Scientific Electronic Library Online (English)

Full Text Available SciELO Mexico | Language: English Abstract in spanish Se sintetiza la información conocida de los Veronicellidae de México. Los datos provienen de ejemplares depositados en la Colección Nacional de Moluscos, Instituto de Biología, Universidad Nacional Autónoma de México, de salidas complementarias de trabajo al campo y recopilación de la literatura. Es [...] tas babosas se distribuyen principalmente en el centro y sur de México, aunque existen algunos registros en el norte del país. Se han registrado 3 géneros y 5 especies: Leidyula floridana, L. moreleti, Phyllocaulis gayi, Sarasinula dubia, y S. plebeia. Los registros en México de L. floridana y P. gayi deben confirmarse. En la región de Los Tuxtlas, al sur del estado de Veracruz, se localizó un foco donde las babosas Veronicellidae son plaga, los agricultores dejaron de sembrar frijol y cambiaron a otros cultivos para evitar la plaga. Abstract in english Information is presented regarding the species of the Family Veronicellidae in Mexico. Data were gathered from specimens deposited in the Colección Nacional de Moluscos (Instituto de Biología, Universidad Nacional Autónoma de México), from field trips, and from the literature. These slugs are distri [...] buted mainly in the central and southern regions of Mexico, although there are a few records from the northern part of the country. Five species in three genera have been recorded, namely: Leidyula floridana, L. moreleti, Phyllocaulis gayi, Sarasinula dubia and S. plebeia. The occurrence of Leidyula floridana and Phyllocaulis gayi in Mexico needs confirmation. The Los Tuxtlas region, southern Veracruz, is a hotspot where veronicellid slugs have become a pest and farmers have stopped growing beans, switching to other crops as a measure to contain the pest.

Edna, Naranjo-García; José Willibaldo, Thomé; José, Castillejo.

219

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

Scientific Electronic Library Online (English)

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

Sonia Barbosa dos, Santos.

220

Yochelcionella (Mollusca, Helcionelloida from the lower Cambrian of North America  

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Full Text Available Five named species of the helcionelloid mollusc genus Yochelcionella Runnegar & Pojeta, 1974 are recognized from the lower Cambrian (Cambrian Series 2 of North America: Yochelcionella erecta (Walcott, 1891, Y. americana Runnegar &Pojeta, 1980, Y. chinensis Pei, 1985, Y. greenlandica Atkins & Peel, 2004 and Y. gracilis Atkins & Peel, 2004, linking lower Cambrian outcrops along the present north-eastern seaboard. Yochelcionella erecta, an Avalonian species, is described for the first time; other species are derived from Laurentia. A revised concept of the Chinese species, Y. chinensis, is based mainly on a large sample from the Forteau Formation of western Newfoundland and the species may have stratigraphic utility between Cambrian palaeocontinents.

Atkins C J

2008-03-01

 
 
 
 
221

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

Scientific Electronic Library Online (English)

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

Sonia Barbosa dos, Santos.

1994-06-01

222

Vanadium, rubidium and potassium in Octopus vulgaris (Mollusca: Cephalopoda)  

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Se determinaron los niveles de vanadio, rubidio y potasio en Octopus vulgaris capturado durante las actividades pesqueras en tres localidades de Portugal (Cascais, Santa Luzia y Viana do Castelo). Las concentraciones de estos elementos se determinaron en la glándula digestiva, corazón branquial, branquias, manto y en los brazos de machos y hembras en otoño y primavera. Al menos cinco machos y cinco hembras se muestrearon para cada combinación de temporada/localidad. Las concentrac...

Seixas, So?nia; Pierce, Graham J.

2005-01-01

223

Parasites in Bulinus senegalensis (Mollusca: Planorbidae) and their detection.  

Science.gov (United States)

Isoelectric focusing studies on enzyme variation between populations of the snail Bulinus senegalensis revealed that parasitic infections in the snails contributed additional bands of enzyme activity, particularly in the glucose phosphate isomerase (GPI) and malate dehydrogenase (MDH) systems. The patterns due to the parasite enzymes were, in most cases, clearly distinct from those of the host and different from each other. Parasites encountered included Schistosoma haematobium, S. bovis, Paramphistomum microbothrium, another amphistome probably belonging to the group which infect amphibians, Echinostoma revolutum, another echinostome (probably Echinoparyphium sp.), strigeids, xiphidiocercariae (these were resolved into 3 distinct types by the enzyme data) and ciliate protozoa. The 7 host populations which were examined showed marked differences in both the prevalence and variety of their parasitic infections and these variations were tentatively related to environmental differences in their respective habitats and to the nature of human contact patterns. Seasonal changes in the parasite fauna were also noted and some of the implications of the parasite load on the host population are briefly mentioned. PMID:44358

Wright, C A; Rollinson, D; Goll, P H

1979-08-01

224

A new dicyemid from Octopus hubbsorum (Mollusca:Cephalopoda:Octopoda).  

Science.gov (United States)

A new species of dicyemid mesozoan is described from Octopus hubbsorum Berry, 1953, collected in the south of Bahia de La Paz, Baja California Sur, México. Dicyema guaycurense n. sp. is a medium-size species that reaches about 1,600 µm in length. It occurs in folds of the renal appendages. The vermiform stages are characterized as having 22 peripheral cells, a conical calotte, and an axial cell that extends to the base of the propolar cells. Infusoriform embryos consist of 39 cells; 1 nucleus is present in each urn cell and the refringent bodies are solid. This is the first of a dicyemid species from a host collected in the Gulf of California. PMID:21506788

Castellanos-Martinez, Sheila; Gómez, M Carmen; Hochberg, F G; Gestal, Camino; Furuya, Hidetaka

2011-04-01

225

Three new dicyemids from Octopus sasakii (Mollusca: Cephalopoda: Octopoda).  

Science.gov (United States)

Three new species of dicyemid mesozoan are described from Octopus sasakii Taki, 1942, collected from Tosa Bay and Kii Strait in Japan. Dicyema shimantoense n. sp. is a medium-size species that reaches about 3,000 microm in length, and lives in folds of the renal appendages. The vermiform stages are characterized by having 22 peripheral cells, a conical calotte, and an axial cell that extends to the base of the propolar cells. Infusoriform embryos consist of 37 cells; a single nucleus is present in each urn cell, and the refringent bodies are solid. Dicyema codonocephalum n. sp. is also a medium-size species that reaches about 2,000 microm in length. It too lives in folds of the renal appendages. The vermiform stages are characterized by having 17-22 peripheral cells, an elongated calotte, and an axial cell that extends to the middle of propolar cells. Infusoriform embryos consist of 37 cells; a single nucleus is present in each urn cell, and the refringent bodies are solid. Dicyemennea pileum n. sp. is a medium species that reaches about 2,000 microm in length. It attaches to the surface of the renal appendages. The vermiform stages are characterized by having 23 peripheral cells, a disc-shaped calotte, and an axial cell that extends to the propolar cells. An anterior abortive axial cell is absent in vermiform embryos. Infusoriform embryos consist of 38 cells; 2 nuclei are present in each urn cell, and the refringent bodies are liquid. These are the first dicyemids to be described from Octopus sasakii. PMID:18576860

Furuya, Hidetaka

2008-10-01

226

Sublethal foot-predation on Donacidae (Mollusca: Bivalvia)  

Science.gov (United States)

The incidence of foot nipping was studied on the Donax spp. of the littoral of Málaga (Southern Spain, 2875 specimens collected from February 1990 to January 1991) and of Ré island (French Atlantic coast, 262 specimens of Donax vittatus (Da Costa, 1778) collected in May 1996). In Málaga, Donax trunculus L., 1758 was the species most regularly nipped (18% of individuals), with peaks in summer (25% in August and 48% in September) and winter (34% in December). In Ré island, 27% of the specimens showed a nipped foot. Logistic regression shows that in D. trunculus length is the variable that most influences the probability of foot nipping, followed by weight and chlorophyll a. However, the difference in length between damaged and undamaged individuals was not significant (U-Mann-Whitney test). The size class frequency and the values of Ivlev's index show that the small size classes were avoided, while for the other size classes predation remained balanced throughout the year. Therefore, the avoidance of the small size classes makes length the most influential variable. The logistic regression indicated a coefficient B=-0.03 for weight. This implies a slightly negative influence on the probability of foot nipping. However, without the data of September, there is a positive correlation ( r=0.76, ptrunculus lost by foot nipping amounts to more than 20% in most of the size classes. There was an increase from the small sizes to the largest ones, in which it reaches 37%, with a positive correlation ( r=0.84; p<0.005) between size class and loss of biomass. Possible predators responsible for the foot nipping are crabs. Crab species usually found together with the donacids were Portumnus latipes (Pennant, 1777) Liocarcinus vernalis (Risso, 1816) and Atelecyclus undecimdentatus (Herbst, 1783). In aquarium experiments, they demonstrated an ability to nip the foot of clams. Portumnus latipes was the most active foot nipper, but left alive all the damaged clams. Therefore, we conclude that crabs are the most likely foot-nipping predators in the field.

Salas, Carmen; Tirado, Cristina; Manjón-Cabeza, Maria Eugenia

2001-08-01

227

Mollusca (terrestrial and marine Gastropods et Bivalvia) from Morocco  

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Fifteen samples with molluscs are collected from various habitats and regions of Morocco, located in the seashore zone, as well as the central and the eastern parts of the country. We recorded 21 terrestrial and 15 marine species of molluscs. New localities and new species for the fauna of Morocco and the African continent are reported for the first time.

Atanas Irikov; Georgi Gerdzhikov

2013-01-01

228

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

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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.

Sonia Barbosa dos Santos

1994-06-01

229

Primer registro de Dondice parguerensis (Mollusca: Favorinidae para Venezuela First record of Dondice parguerensis (Mollusca: Favorinidae in Venezuela  

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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.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.

Joany Mariño

2011-06-01

230

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

Scientific Electronic Library Online (English)

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.

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

231

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

Scientific Electronic Library Online (English)

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.

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

2014-06-01

232

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

Scientific Electronic Library Online (English)

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. [...

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

2013-06-01

233

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

Scientific Electronic Library Online (English)

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.

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

2009-06-01

234

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

Scientific Electronic Library Online (English)

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.

William, Villalba; Roberta, Crescini.

1321-13-01

235

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

Scientific Electronic Library Online (English)

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

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

2011-06-01

236

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)

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.

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

2013-08-01

237

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

Scientific Electronic Library Online (English)

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.

William, Villalba; Roberta, Crescini.

238

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

Scientific Electronic Library Online (English)

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.

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

2010-12-01

239

Molluscicidal activity of various solvent extracts from Solanum nigrum var. villosum L. aerial parts against Galba truncatula.  

Science.gov (United States)

Molluscicidal activity of Solanum nigrum var. villosum (morelle velue) extracts and their fractions were tested against the mollusca gastropoda Galba truncatula intermediate host of Fasciola hepatica. The results indicated that the hydro-methanol (MeOH-H2O) immature fruit extract possess the highest molluscicidal activity (LC50 = 3.96 mg/L) against Galba truncatula compared with other tested compounds. After acido-basic treatment, the methanolic extract fraction isolated from the immature fruits and the richest in alkaloids was the most toxic (LC50 = 1.65 mg/L). The fractions richest in saponosides obtained from the hydromethanolic and methanolic extracts of immature fruits showed interesting molluscicidal activities (LC50 = 6.15 mg/L and LC50 = 7.91 mg/L, respectively). The observed molluscicide activity could be attributed to the presence of alkaloids or saponosides. So, the immature fruits of Solanum nigrum var. villosum could be substrates of choice for molluscicide activity. In addition, total alkaloids and saponosides present in this plant deserve further investigations in order to identify the active principles and demonstrate their activities on mollusks in their natural habitat. According to the World Health Organization's guidelines on screening for plant molluscicides, use of these fractions may add to the arsenal of methods to control snail transmitting fasciolosis in tropical and Third World countries where fasciolosis is a common disease. PMID:21395207

Hammami, H; Mezghani-Jarraya, R; Damak, M; Ayadi, A

2011-02-01

240

Color pattern variation in a shallow-water species of opisthobranch mollusc.  

Science.gov (United States)

The color pattern of benthic opisthobranch sea slugs (Mollusca: Gastropoda) appears to play an important defensive role, and numerous species seem to have aposematic (warning) colorations. Color pattern is an important trait for opisthobranch identification-this conclusion is based on the assumption that most species have limited color variation. For those species in which color variation is recognized, the reasons for the variation remain unknown. In this paper we study Philinopsis pusa, a benthic putative species of opisthobranch sea slug with a broad range of color pattern. Lighter individuals appear to be camouflaged on the white sand environment in which the animals are typically found, whereas darker individuals appear conspicuously different from their background. Because of its broad color variation, P. pusa has been subdivided into different species. Animals were collected and observed in the Bahamas during a 6-year span. The color pattern of the specimens was subjectively classified into five phenotypic classes. Two mitochondrial genes (16S, CO1) were sequenced from 41 specimens. The association between color pattern, body length, burrowing escaping behavior, and the genetic structure of the population was investigated. We found two genetically distinct groups in the target population but no significant association between color pattern and genetic structure. Additionally, there was no significant association between color pattern and ontogeny or defensive behavior in these organisms. The present paper suggests that general assumptions on the biological and evolutionary role of color in opisthobranchs need to be carefully evaluated. PMID:23493507

Valdés, Ángel; Ornelas-Gatdula, Elysse; Dupont, Anne

2013-02-01

 
 
 
 
241

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

DEFF Research Database (Denmark)

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.

Clausen, Karin; Larsen, Martin H.

2008-01-01

242

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)

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.

Solange Viana Paschoal Blanco Brandolini

2001-06-01

243

ARMINA JULIANA (GASTROPODA: NUDIBRANCHIA: ARMINIDAE), A NEW SPECIES FROM THE SOUTHERN CARIBBEAN / ARMINA JULIANA (GASTROPODA: NUDIBRANCHIA: ARMINIDAE), UNA ESPECIE NUEVA DEL CARIBE SUR  

Scientific Electronic Library Online (English)

Full Text Available SciELO Colombia | Language: English Abstract in spanish Se describe una especie nueva del género Armina, colectada frente a la costa septentrional del Caribe colombiano, en fondos blandos, a profundidades de 310 y 460 m. El número de crestas notales, la posición de la papila genital, el tamaño y la forma de los dientes radulares y las características de [...] los procesos masticatorios son las principales diferencias con otras especies congéneres presentes en el Atlántico. Armina juliana especie nueva, es el primer registro de la familia Arminidae en el Caribe colombiano. Abstract in english A new species of the genus Armina,collected off the northern Caribbean coast of Colombia at depths of 310 and 460 m in soft bottoms is described. The number of notal ridges, the position of the genital papilla, the size and the shape of radular teeth and the features of the masticatory process are t [...] he main differences to other congeneric species occurring in Atlantic waters. Armina juliana n. sp. is the first record for the family Arminidae in the Colombian Caribbean.

Néstor, E; , Ardila E; Juan Manuel, Díaz.

2002-12-01

244

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

Digital Repository Infrastructure Vision for European Research (DRIVER)

Introducción: los moluscos marinos constituyen un reservorio natural de moléculas con potencialidades terapéuticas para el tratamiento de enfermedades infecciosas en momentos en que se han descrito numerosas cepas resistentes a los antibióticos convencionales. Objetivo: comparar 3 soluciones: ácido acético 30 %, metanol 50 % y salina-ácida (NaCl 0,6 mol/L, HCl 1 %) atendiendo a sus capacidades extractivas de moléculas con actividad antibacteriana del molusco marino Cenchritis muricatu...

Annia Alba Menéndez; Carlos López Abarrategui; Va?zquez Perera, Antonio A.; Otero Gonza?lez, Anselmo J.

2011-01-01

245

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

Scientific Electronic Library Online (English)

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

Ana Maria, Leal-Zanchet.

246

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

Scientific Electronic Library Online (English)

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

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

2014-03-01

247

Alguns aspectos da biologia de Lymnaea columella Say, 1817 (Gastropoda, Pulmonata Some observations on the life-history of Lymnaea columella Say, 1817 (Gastropoda, Pulmonata  

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Full Text Available Foram estudados aspectos da biologia da Lymnaea columella Say, 1817, em condições de laboratório e determinadas as variações da duração do período embrionário em relação à temperatura da água.Some aspects on the life history of Lymnaea columella Say, 1817 were studied under laboratory conditions. The relationship between incubation period of the eggs and water temperature was established.

Marlene Tiduko Ueta

1976-12-01

248

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  

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Full Text Available Introducción: los moluscos marinos constituyen un reservorio natural de moléculas con potencialidades terapéuticas para el tratamiento de enfermedades infecciosas en momentos en que se han descrito numerosas cepas resistentes a los antibióticos convencionales. Objetivo: comparar 3 soluciones: ácido acético 30 %, metanol 50 % y salina-ácida (NaCl 0,6 mol/L, HCl 1 % atendiendo a sus capacidades extractivas de moléculas con actividad antibacteriana del molusco marino Cenchritis muricatus. Métodos: para el procesamiento del material biológico se utilizaron las 3 soluciones de extracción y se analizaron los extractos obtenidos de acuerdo con la concentración de proteínas totales y la inhibición del crecimiento bacteriano de cepas de Staphylococcus aureus y Escherichia coli, mediante un bioensayo turbidimétrico en microplacas de 96 pocillos en medio Luria-Bertani. Resultados: se obtuvo mayor concentración de proteínas totales (7,8 mg/mL con el extracto total de C. muricatus obtenido con la solución salina-ácida. Además con 200 mg/mL de proteínas totales del extracto se obtuvo inhibición significativa (pIntroduction: marine mollusks are natural reservoirs of molecules with therapeutic potential for the treatment of infectious diseases, at a time when many antibiotic-resistant strains are being described. Objective: to compare three solutions: 30% acetic acid, 50% methanol and saline-acid (NaCl 0.6 mol/L, 1% HCl according to their capacities to extract molecules with antimicrobial activity from the marine mollusk Cenchritis muricatus. Methods: the three extraction solutions were used to process the biological material, and then, the obtained extracts were analyzed in terms of total protein concentration and the bacterial growth inhibition of Staphylococcus aureus and Escherichia coli strains by means of a turbidimetric bioassay using 96 well microplates in Luria-Bertani (LB culture medium. Results: the highest total protein concentration (7.8 mg/mL was found in the C. muricatus extract from the saline-acid solution. Additionally, 200 mg/mL of total proteins from the extract caused significant growth inhibition (p<0.001 of S. aureus (12.64 % and E. coli (12.1 % compared to the positive control of growth inhibition using chloramphenicol. Conclusions: according to these results, the saline-acid solution proved to be more efficient in extracting molecules with antibacterial activity that are likely to be antimicrobial peptides from C. muricatus.

Annia Alba Menéndez

2011-08-01

249

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)  

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

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

2011-08-01

250

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

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

Daniele Pedrosa Monteiro

2001-12-01

251

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

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

Daniele Pedrosa, Monteiro; Sônia Barbosa dos, Santos.

252

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

Scientific Electronic Library Online (English)

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

Daniele Pedrosa, Monteiro; Sônia Barbosa dos, Santos.

1049-10-01

253

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

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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.

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

2014-09-01

254

Scavenging behaviour by Ergalatax contractus (Gastropoda: Muricidae) and interactions with Nassarius nodifer (Gastropoda: Nassariidae) in the Cape d'Aguilar Marine Reserve, Hong Kong  

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Aspects of the feeding behaviour of Ergalatax contractus (Muricidae) were studied. Field experiments demonstrated that large numbers of individuals of this species, comprising [similar]90% of a suite of gastropod scavengers, were attracted to baited traps in the subtidal sands of Lobster Bay, Cape d'Aguilar Marine Reserve, Hong Kong. Laboratory experiments identified the effective chemo-detection distances of E. contractus as 60 cm in still and >80 cm in flowing water, respectively. The avera...

Morton, B.

2006-01-01

255

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

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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 rep...

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

2005-01-01

256

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

Scientific Electronic Library Online (English)

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

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

2005-08-01

257

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

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

A. C. M. Horn

2005-08-01

258

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

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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.

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

2012-06-01

259

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

260

Ocorrência de Sarasinula marginata (Mollusca: Soleolifera) em Belo Horizonte, MG, Brasil / Occurrence of Sarasinula marginata (Mollusca: Soleolifera) in Belo Horiozonte, MG, Brazil  

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Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese [...] Abstract in english The occurrence of Sarasinula marginata, a possible intermediate host of Angiostrongylus costaricensis, in the city of Belo Horizonte, MG, Brazil, is reported on. [...

Lais Clark, Lima; Cecília Pereira de, Souza.

 
 
 
 
261

Ocorrência de Sarasinula marginata (Mollusca: Soleolifera) em Belo Horizonte, MG, Brasil / Occurrence of Sarasinula marginata (Mollusca: Soleolifera) in Belo Horiozonte, MG, Brazil  

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Full Text Available SciELO Public Health | Language: Portuguese Abstract in portuguese [...] Abstract in english The occurrence of Sarasinula marginata, a possible intermediate host of Angiostrongylus costaricensis, in the city of Belo Horizonte, MG, Brazil, is reported on. [...

Lais Clark, Lima; Cecília Pereira de, Souza.

262

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

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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.

Viviana M Castillo

2008-06-01

263

The interference of methods in the collection of teredinids (Mollusca, Bivalvia in mangrove habitats Interferência de métodos na coleta de teredinídios (Mollusca, Bivalvia em habitats de manguezais  

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Full Text Available In the estuary of the Mamanguape River (Paraíba, Brazil, a new collection technique was developed and applied with virgin poles of mangrove trees Avicennia schaueriana (Verbenaceae, Rhizophora mangle (Rhizophoraceae, and Laguncularia racemosa (Combretaceae, taking into account wood preference, water salinity and depth influence during teredinid larval settlement. Sets of poles were vertically fixed in the riverbed at three sites along a decreasing salinity gradient, where they stayed for four months. The poles were collected and divided into upper, median, and lower segments, in agreement with different immersion regimes. An increase of 239% was obtained in the number of individuals when compared to a previous study in the same area using a different methodology. The species Teredo bartschi (Clapp, 1923, Nausitora fusticula (Jeffreys, 1860 and Bankia fimbriatula Moll & Roch, 1931 were registered in both studies, and the species Psiloteredo healdi (Bartsch, 1931 is here registered for the first time as occurring in that estuary. The species Neoteredo reynei (Bartsch, 1920, previously registered on tree branches of the mangrove habitat, was not found in the present work. Bankia fimbriatula, the most abundant species, did not show preference for any substratum but occurred significantly on the lower segment of the poles. N. fusticula, second in abundance, preferred to settle on poles of A. schaueriana and on any of the three segments. Aiming to assess the habitat variations, a more accurate study on teredinids diversity in mangrove ecosystems should be performed through a concomitant analysis from tree branches of the mangrove habitat, as well as from poles of mangrove trees or panels made of pine wood or mangrove trees wood. These collection devices should be maintained along a decreasing salinity gradient exposed to different tide levels.Contemplando a preferência pelo tipo de madeira, a influência da profundidade e da salinidade durante assentamento larval de teredinídeos, uma nova técnica de coleta foi aplicada e desenvolvida no estuário do rio Mamanguape (Paraíba, Brasil, utilizando varas virgens de três espécies de árvores do manguezal: Avicennia schaueriana (Verbenaceae, Rhizophora mangle (Rhizophoraceae e Laguncularia racemosa (Combretaceae. Em três estações demarcadas ao longo do gradiente decrescente de salinidade, conjuntos de varas foram verticalmente fixados nas margens do rio. Após quatro meses, as varas eram coletadas e divididas em três segmentos (superior, médio e inferior, de acordo com os regimes de imersão a que foram submetidas. Comparativamente aos dados obtidos por um estudo anterior na mesma área, com outras metodologias de coleta, foi obtido um aumento de 239% no número de indivíduos coletados com a nova técnica. Embora as espécies Teredo bartschi (Clapp, 1923, Nausitora fusticula (Jeffreys, 1860 e Bankia fimbriatula Moll & Roch, 1931 tenham ocorrido nos dois estudos, o teredinídeo Psiloteredo healdi (Bartsch, 1931 tem sua presença registrada pela primeira vez neste estuário. Tendo sido previamente registrada em ramos de árvores do manguezal, Neoteredo reynei (Bartsch, 1920 não foi coletada no presente trabalho. Sendo a espécie mais abundante, B. fimbriatula não mostrou preferência de assentamento em nenhum dos substratos, ocorrendo significativamente associada ao segmento inferior das varas. Como segunda espécie mais abundante, N. fusticula mostrou preferência significativa de assentamento em A. schaueriana, ocorrendo indistintamente nos três segmentos das varas. Visando contemplar as variações do habitat e obter maior precisão de resultados, é recomendável que em estudos sobre a diversidade de teredinídeos, sejam incluídas análises concomitantes de troncos e ramos das árvores, com o uso de varas de árvores do manguezal ou de coletores artificiais feitos com pinho ou madeira de árvores do manguezal. Os coletores devem ser mantidos ao longo do gradiente de salinidade e expostos aos diferentes níveis das marés.

Rosa M. V. Leonel

2006-03-01

264

The interference of methods in the collection of teredinids (Mollusca, Bivalvia) in mangrove habitats / Interferência de métodos na coleta de teredinídios (Mollusca, Bivalvia) em habitats de manguezais  

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Full Text Available SciELO Brazil | Language: English Abstract in portuguese Contemplando a preferência pelo tipo de madeira, a influência da profundidade e da salinidade durante assentamento larval de teredinídeos, uma nova técnica de coleta foi aplicada e desenvolvida no estuário do rio Mamanguape (Paraíba, Brasil), utilizando varas virgens de três espécies de árvores do m [...] anguezal: Avicennia schaueriana (Verbenaceae), Rhizophora mangle (Rhizophoraceae) e Laguncularia racemosa (Combretaceae). Em três estações demarcadas ao longo do gradiente decrescente de salinidade, conjuntos de varas foram verticalmente fixados nas margens do rio. Após quatro meses, as varas eram coletadas e divididas em três segmentos (superior, médio e inferior), de acordo com os regimes de imersão a que foram submetidas. Comparativamente aos dados obtidos por um estudo anterior na mesma área, com outras metodologias de coleta, foi obtido um aumento de 239% no número de indivíduos coletados com a nova técnica. Embora as espécies Teredo bartschi (Clapp, 1923), Nausitora fusticula (Jeffreys, 1860) e Bankia fimbriatula Moll & Roch, 1931 tenham ocorrido nos dois estudos, o teredinídeo Psiloteredo healdi (Bartsch, 1931) tem sua presença registrada pela primeira vez neste estuário. Tendo sido previamente registrada em ramos de árvores do manguezal, Neoteredo reynei (Bartsch, 1920) não foi coletada no presente trabalho. Sendo a espécie mais abundante, B. fimbriatula não mostrou preferência de assentamento em nenhum dos substratos, ocorrendo significativamente associada ao segmento inferior das varas. Como segunda espécie mais abundante, N. fusticula mostrou preferência significativa de assentamento em A. schaueriana, ocorrendo indistintamente nos três segmentos das varas. Visando contemplar as variações do habitat e obter maior precisão de resultados, é recomendável que em estudos sobre a diversidade de teredinídeos, sejam incluídas análises concomitantes de troncos e ramos das árvores, com o uso de varas de árvores do manguezal ou de coletores artificiais feitos com pinho ou madeira de árvores do manguezal. Os coletores devem ser mantidos ao longo do gradiente de salinidade e expostos aos diferentes níveis das marés. Abstract in english In the estuary of the Mamanguape River (Paraíba, Brazil), a new collection technique was developed and applied with virgin poles of mangrove trees Avicennia schaueriana (Verbenaceae), Rhizophora mangle (Rhizophoraceae), and Laguncularia racemosa (Combretaceae), taking into account wood preference, w [...] ater salinity and depth influence during teredinid larval settlement. Sets of poles were vertically fixed in the riverbed at three sites along a decreasing salinity gradient, where they stayed for four months. The poles were collected and divided into upper, median, and lower segments, in agreement with different immersion regimes. An increase of 239% was obtained in the number of individuals when compared to a previous study in the same area using a different methodology. The species Teredo bartschi (Clapp, 1923), Nausitora fusticula (Jeffreys, 1860) and Bankia fimbriatula Moll & Roch, 1931 were registered in both studies, and the species Psiloteredo healdi (Bartsch, 1931) is here registered for the first time as occurring in that estuary. The species Neoteredo reynei (Bartsch, 1920), previously registered on tree branches of the mangrove habitat, was not found in the present work. Bankia fimbriatula, the most abundant species, did not show preference for any substratum but occurred significantly on the lower segment of the poles. N. fusticula, second in abundance, preferred to settle on poles of A. schaueriana and on any of the three segments. Aiming to assess the habitat variations, a more accurate study on teredinids diversity in mangrove ecosystems should be performed through a concomitant analysis from tree branches of the mangrove habitat, as well as from poles of mangrove trees or panels made of pine wood or mangrove trees wood. These collection devices should

Rosa M. V., Leonel; Sônia G. B. C., Lopes; Daniela T. de, Moraes; Marcos, Aversari.

2006-03-01

265

A comparative study of the Bivalvia (Mollusca) from the continental shelves of Antarctica and Brazil / Estudo comparativo dos Bivalvia (Mollusca) da plataforma continental da Antártica e do Brasil  

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Full Text Available SciELO Brazil | Language: English Abstract in portuguese Durante a identificação de moluscos bivalves coletados na Antártica, foi reunida uma rica bibliografia taxonômica, estimulando comparações com a malacofauna do Brasil. Assim, listamos um total de 68 espécies conhecidas para águas rasas (menos de 200 m de profundidade) da Antártica e 368 para o Brasi [...] l, procurando encontrar espécies, famílias e superfamílias em comum a ambos os locais, e investigando em que essas malacofaunas diferem em relação aos grupos representados e em relação ao hábito de vida das suas espécies. Vinte e três superfamílias não possuem representantes antárticos, mas estão presentes com pelo menos uma espécie brasileira; o oposto não ocorre, pois todas superfamílias que ocorrem na Antártica também são conhecidas para o Brasil. O número de espécies brasileiras é maior, composto por uma mistura de táxons de diferentes províncias biogeográficas, enquanto na Antártica existem somente poucas espécies adaptadas às condições polares, com uma minoria de representantes de fora da Antártica. Dessa forma, muitas espécies típicas do caribe se distribuem até o Brasil, pertencendo aos diversos Arcoidea, Pectinoidea, Lucinoidea, Cardioidea, Veneroidea e Tellinoidea. Cimentantes Ostreoidea, Plicatuloidea, Dimyoidea, Spondylidae (Pectinoidea) e Chamoidea não estão presentes na Antártica, como também não estão perfuradores de madeira (Teredinidae, Pholadoidea) e de rochas (Pholadidae, Pholadoidea; Gastrochaenoidea; e Lithophaginae, Mytiloidea). É notável o grande número de espécies brasileiras de grupos infaunais (exemplos, Tellinidae, Veneridae, Cardiidae e Mactroidea) e epifaunais (Pectinidae, Mytilidae e Arcidae), que são ausentes ou pobremente representados na Antártica. Nuculanoidea, Limopsoidea, Lucinoidea, Galeommatoidea, Cyamioidea e Cuspidarioidea são os grupos mais ricos em espécies antárticas, alguns deles também sendo especiosos no Brasil, entretanto, em maiores profundidades. Três espécies são registradas para ambos os locais: Limatula pygmaea (Limidae), Lasaea adansoni (Lasaeidae) e Gaimardia trapesina (Gaimardiidae). Através de análises dos grupos, é possível apontar aqueles que são taxonomicamente diversos em uma ou outra fauna, e então enfatizá-los em estudos ecológicos, utilizando-os como "organismos monitores" ou modelos. O presente trabalho pode ser um ponto de partida para futuras discussões sobre a ocorrência de um gradiente latitudinal ao longo da costa leste da América do Sul, estimulando trabalhos sobre mudanças que ocorrem na composição das faunas de bivalves do Brasil, Uruguai, Argentina e Antártica. Abstract in english During identification of bivalve molluscs collected in Antarctica, a rich taxonomic bibliography was gathered, stimulating comparisons with the Brazilian malacofauna. We listed a total of 68 and 368 known shallow-water species (less than 200 m depth) from Antarctica and Brazil, respectively, in orde [...] r to find species, families and superfamilies in common, and to investigate how these malacofaunas differ in regard to these representative groups and their life habits. There are 23 superfamilies absent in Antarctica, but present in Brazil with at least one species; the reverse does not occur, as all superfamilies known from Antarctica are also recorded from Brazil. The number of Brazilian species is higher, being composed of a mixture of taxa from different biogeographical provinces, whereas in Antarctica there are only a few species adapted to its polar conditions, with minor components from elsewhere. Thus, many typical Caribbean species extend into Brazil, belonging to the diverse Arcoidea, Pectinoidea, Lucinoidea, Cardioidea, Veneroidea, and Tellinoidea. Cemented Ostreoidea, Plicatuloidea, Dimyoidea, Spondylidae (Pectinoidea), and Chamoidea are absent from Antarctica, as are wood (Teredinidae, Pholadoidea) and rock borers (Pholadidae, Pholadoidea; Gastrochaenoidea; and Lithophaginae, Mytiloidea). A large number o

Flávio Dias, Passos; Frederico Thomaisino, Magalhães.

2011-03-01

266

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  

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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.

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

267

Late Maastrichtian-Danian Mytilids and Pinnids (Mollusca: Bivalvia) from Northern Patagonia, Argentina / Mytílidos y Pínnidos (Mollusca: Bivalvia) del Maastrichtiano Tardío - Daniano del Norte de Patagonia, Argentina  

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Full Text Available SciELO Argentina | Language: English Abstract in spanish Las rocas del Cretácico Superior-Paleógeno inferior expuestas en el norte de Patagonia contienen una rica fauna de moluscos cuyo estudio es importante para comprender los cambios paleobiogeográficos y paleoambientales producidos en la región durante el límite K/P. Sin embargo, una porción considerab [...] le de esta fauna permanece poco estudiada, probablemente a causa de su pobre preservación. En este trabajo se describen tres especies nuevas de mytílidos (Septifer mayai n. sp., Mytilaster ? edseli n. sp. y Gregariella amara n. sp.) y cuatro especies de pínnidos de las cuales una es nueva (Plesiopinna pampeana n. sp.). Todos los ejemplares provienen de las formaciones Jagüel (Maastrichtiano) y Roca (Maastrichtiano/Daniano) expuestas en las provincias de Río Negro, La Pampa y Mendoza, Argentina. Gregariella amara es la única especie que se registra en el Maastrichtiano y Daniano. Abstract in english The Upper Cretaceous - lower Paleogene rocks from northern Patagonia yield a rich fauna of marine mollusks that may be useful in elucidating paleobiogeographic and paleoenvironmental changes taking place across the K/P boundary in the region. Most of the mollusk faunas remain poorly understood, as t [...] he preservation is generally deficient. This paper describes three new species of mytilids (Septifer mayai n. sp., Mytilaster ? edseli n. sp. and Gregariella amara n. sp.), and records four species of pinnids, one of which is new (Plesiopinna pampeana n. sp.). All the material comes from the Maastrichtian Jagüel Formation, and the Maastrichtian/Danian Roca Formation, exposed in the provinces of Río Negro, Mendoza and La Pampa (Argentina). A survey of the stratigraphic distribution of the material described shows that the only Maastrichtian species that survived into the Danian was Gregariella amara.

Miguel, Griffin; Ana, Parras; Silvio, Casadío.

2008-03-30

268

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

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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

Enrique Dupré

2006-11-01

269

Controle biológico: Pomacea haustrum Reeve, 1856 (Mollusca, pilidae) sobre planorbíneos, em laboratório / Biological control: Pomacea haustrum Reeve, 1856 (Mollusca pilidae) over planorbids under laboratory conditions  

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Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese Foi acompanhado em laboratório o controle de planorbíneos (Biomphalaria straminea Dunker, 1848; B. tenagophila Orbigny, 1835 e B. glabrata Say, 1818), hospedeiros intermediários da esquistossomose mansoni, através da predação de suas desovas pelo pilídeo Pomacea haustrum Reeve, 1856. De 829 desovas [...] ovipostas por B. straminea, 203 (24,5%) foram expostas a 10 exemplares de P. haustrum; destas, 200 (98,3%) foram predadas. De 892 desovas ovipostas por B. tenagophia, 201 (22,5%) foram expostas a 10 exemplares de P. haustrum; destas, 194 (97,0%) foram predadas. De 1.300 desovas ovipostas por B. glabrata, 657 (50,5%) foram expostas a 10 exemplares de P. haustrum sendo totalmente predadas. Paralelamente, procurou-se observar as possíveis interações ocorridas entre pomáceas e planorbíneos quando da coabitação do mesmo aquário. Abstract in english The biological control of planorbids (Biomphalaria straminea Dunker, 1848; B. tenagophila Orbigny, 1835 and B. glabrata Say, 1818) through the predation of their eggmasses by the pilid Pomacea haustrum Reeve, 1856, was observed under laboratory conditions. Of 829 eggmasses laid by B. straminea, 203 [...] (24.5%) were exposed to 10 specimens of P. haustrum and 200 (98.3%) of them were predation. Of 892 eggmasses laid by B. tenagophila, 210 (22.5%) were exposed to 10 specimens of P. haustrum and 194 (97.0%) were predate. Of 1,300 eggamsses laid by B. glabrata, 657 (50.5%) were exposed to 10 specimens of P. haustrum and were totally predate. Parallel to this the possible interaction of pomaceas and planorbids when they lived in the same aquarium has been observed.

Carlos Tito, Guimarães.

270

Controle biológico: Pomacea haustrum Reeve, 1856 (Mollusca, pilidae) sobre planorbíneos, em laboratório / Biological control: Pomacea haustrum Reeve, 1856 (Mollusca pilidae) over planorbids under laboratory conditions  

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Full Text Available SciELO Public Health | Language: Portuguese Abstract in portuguese Foi acompanhado em laboratório o controle de planorbíneos (Biomphalaria straminea Dunker, 1848; B. tenagophila Orbigny, 1835 e B. glabrata Say, 1818), hospedeiros intermediários da esquistossomose mansoni, através da predação de suas desovas pelo pilídeo Pomacea haustrum Reeve, 1856. De 829 desovas [...] ovipostas por B. straminea, 203 (24,5%) foram expostas a 10 exemplares de P. haustrum; destas, 200 (98,3%) foram predadas. De 892 desovas ovipostas por B. tenagophia, 201 (22,5%) foram expostas a 10 exemplares de P. haustrum; destas, 194 (97,0%) foram predadas. De 1.300 desovas ovipostas por B. glabrata, 657 (50,5%) foram expostas a 10 exemplares de P. haustrum sendo totalmente predadas. Paralelamente, procurou-se observar as possíveis interações ocorridas entre pomáceas e planorbíneos quando da coabitação do mesmo aquário. Abstract in english The biological control of planorbids (Biomphalaria straminea Dunker, 1848; B. tenagophila Orbigny, 1835 and B. glabrata Say, 1818) through the predation of their eggmasses by the pilid Pomacea haustrum Reeve, 1856, was observed under laboratory conditions. Of 829 eggmasses laid by B. straminea, 203 [...] (24.5%) were exposed to 10 specimens of P. haustrum and 200 (98.3%) of them were predation. Of 892 eggmasses laid by B. tenagophila, 210 (22.5%) were exposed to 10 specimens of P. haustrum and 194 (97.0%) were predate. Of 1,300 eggamsses laid by B. glabrata, 657 (50.5%) were exposed to 10 specimens of P. haustrum and were totally predate. Parallel to this the possible interaction of pomaceas and planorbids when they lived in the same aquarium has been observed.

Carlos Tito, Guimarães.

271

Controle biológico: Pomacea haustrum Reeve, 1856 (Mollusca, pilidae sobre planorbíneos, em laboratório Biological control: Pomacea haustrum Reeve, 1856 (Mollusca pilidae over planorbids under laboratory conditions  

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Full Text Available Foi acompanhado em laboratório o controle de planorbíneos (Biomphalaria straminea Dunker, 1848; B. tenagophila Orbigny, 1835 e B. glabrata Say, 1818, hospedeiros intermediários da esquistossomose mansoni, através da predação de suas desovas pelo pilídeo Pomacea haustrum Reeve, 1856. De 829 desovas ovipostas por B. straminea, 203 (24,5% foram expostas a 10 exemplares de P. haustrum; destas, 200 (98,3% foram predadas. De 892 desovas ovipostas por B. tenagophia, 201 (22,5% foram expostas a 10 exemplares de P. haustrum; destas, 194 (97,0% foram predadas. De 1.300 desovas ovipostas por B. glabrata, 657 (50,5% foram expostas a 10 exemplares de P. haustrum sendo totalmente predadas. Paralelamente, procurou-se observar as possíveis interações ocorridas entre pomáceas e planorbíneos quando da coabitação do mesmo aquário.The biological control of planorbids (Biomphalaria straminea Dunker, 1848; B. tenagophila Orbigny, 1835 and B. glabrata Say, 1818 through the predation of their eggmasses by the pilid Pomacea haustrum Reeve, 1856, was observed under laboratory conditions. Of 829 eggmasses laid by B. straminea, 203 (24.5% were exposed to 10 specimens of P. haustrum and 200 (98.3% of them were predation. Of 892 eggmasses laid by B. tenagophila, 210 (22.5% were exposed to 10 specimens of P. haustrum and 194 (97.0% were predate. Of 1,300 eggamsses laid by B. glabrata, 657 (50.5% were exposed to 10 specimens of P. haustrum and were totally predate. Parallel to this the possible interaction of pomaceas and planorbids when they lived in the same aquarium has been observed.

Carlos Tito Guimarães

1983-04-01

272

Squid catches (Mollusca: Cephalopoda by industrialfishing landed in Santos: comparison after 4 decades. Captura de lulas (Mollusca: Cephalopoda pela pesca industrial desembarcada em Santos: Comparação após 4 décadas.  

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Full Text Available Analysis of the temporal variation of fishery resources’ landed catch is essential to monitor changes and alterations inthe fisheries and related aquatic ecosystems. Thus, analyzing catches after 4 decades represents a comparisonbetween an initial industrial fishing off Southeastern Brazil and a present exploitation phase, considered as decline, andis particularly uncommon due to the atypical data availability. Through the analysis of 1959 and 1999 Santos landing data,this study aims to identify: (a fleets and gears where squids occurred, with related proportions, (b differences in thesquid’s fishery between the two periods, and (c squids fishing grounds used by the industrial fleets in both periods.Squids were caught by pink-shrimp bottom-trawlers, but also occurred in the sea-bob shrimp fleet, pair-bottom trawlersand purse-seiners, especially in 1959. Differences between both periods can be clearly seen. In 1959, squid fishingareas were more restricted and in lower depths, and in 1999, the areas were broader and deeper. The decrease offishing boats, and the significant increase of squids catch volume can be verified, where its relative abundance (kg/towwas 400 times greater in 1999, showing a great availability increase of those resources in the later period or differenceson exploitation technology between periods. The existence of both “bottom-up” control mechanism (oceanographicvariation-recruitment-fishery production within the fishery ecosystem, and “top-down” control (fishermen-fisheries-structure of marine communities should be taken into account in the interpretation on the squids abundance variation. Analysis of the temporal variation of fishery resources’ landed catch is essential to monitor changes and alterations inthe fisheries and related aquatic ecosystems. Thus, analyzing catches after 4 decades represents a comparisonbetween an initial industrial fishing off Southeastern Brazil and a present exploitation phase, considered as decline, andis particularly uncommon due to the atypical data availability. Through the analysis of 1959 and 1999 Santos landing data,this study aims to identify: (a fleets and gears where squids occurred, with related proportions, (b differences in thesquid’s fishery between the two periods, and (c squids fishing grounds used by the industrial fleets in both periods.Squids were caught by pink-shrimp bottom-trawlers, but also occurred in the sea-bob shrimp fleet, pair-bottom trawlersand purse-seiners, especially in 1959. Differences between both periods can be clearly seen. In 1959, squid fishingareas were more restricted and in lower depths, and in 1999, the areas were broader and deeper. The decrease offishing boats, and the significant increase of squids catch volume can be verified, where its relative abundance (kg/towwas 400 times greater in 1999, showing a great availability increase of those resources in the later period or differenceson exploitation technology between periods. The existence of both “bottom-up” control mechanism (oceanographicvariation-recruitment-fishery production within the fishery ecosystem, and “top-down” control (fishermen-fisheries-structure of marine communities should be taken into account in the interpretation on the squids abundance variation.

M. A. Gasalla

2005-10-01

273

A comparative study of the Bivalvia (Mollusca) from the continental shelves of Antarctica and Brazil / Estudo comparativo dos Bivalvia (Mollusca) da plataforma continental da Antártica e do Brasil  

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Full Text Available SciELO Brazil | Language: English Abstract in portuguese Durante a identificação de moluscos bivalves coletados na Antártica, foi reunida uma rica bibliografia taxonômica, estimulando comparações com a malacofauna do Brasil. Assim, listamos um total de 68 espécies conhecidas para águas rasas (menos de 200 m de profundidade) da Antártica e 368 para o Brasi [...] l, procurando encontrar espécies, famílias e superfamílias em comum a ambos os locais, e investigando em que essas malacofaunas diferem em relação aos grupos representados e em relação ao hábito de vida das suas espécies. Vinte e três superfamílias não possuem representantes antárticos, mas estão presentes com pelo menos uma espécie brasileira; o oposto não ocorre, pois todas superfamílias que ocorrem na Antártica também são conhecidas para o Brasil. O número de espécies brasileiras é maior, composto por uma mistura de táxons de diferentes províncias biogeográficas, enquanto na Antártica existem somente poucas espécies adaptadas às condições polares, com uma minoria de representantes de fora da Antártica. Dessa forma, muitas espécies típicas do caribe se distribuem até o Brasil, pertencendo aos diversos Arcoidea, Pectinoidea, Lucinoidea, Cardioidea, Veneroidea e Tellinoidea. Cimentantes Ostreoidea, Plicatuloidea, Dimyoidea, Spondylidae (Pectinoidea) e Chamoidea não estão presentes na Antártica, como também não estão perfuradores de madeira (Teredinidae, Pholadoidea) e de rochas (Pholadidae, Pholadoidea; Gastrochaenoidea; e Lithophaginae, Mytiloidea). É notável o grande número de espécies brasileiras de grupos infaunais (exemplos, Tellinidae, Veneridae, Cardiidae e Mactroidea) e epifaunais (Pectinidae, Mytilidae e Arcidae), que são ausentes ou pobremente representados na Antártica. Nuculanoidea, Limopsoidea, Lucinoidea, Galeommatoidea, Cyamioidea e Cuspidarioidea são os grupos mais ricos em espécies antárticas, alguns deles também sendo especiosos no Brasil, entretanto, em maiores profundidades. Três espécies são registradas para ambos os locais: Limatula pygmaea (Limidae), Lasaea adansoni (Lasaeidae) e Gaimardia trapesina (Gaimardiidae). Através de análises dos grupos, é possível apontar aqueles que são taxonomicamente diversos em uma ou outra fauna, e então enfatizá-los em estudos ecológicos, utilizando-os como "organismos monitores" ou modelos. O presente trabalho pode ser um ponto de partida para futuras discussões sobre a ocorrência de um gradiente latitudinal ao longo da costa leste da América do Sul, estimulando trabalhos sobre mudanças que ocorrem na composição das faunas de bivalves do Brasil, Uruguai, Argentina e Antártica. Abstract in english During identification of bivalve molluscs collected in Antarctica, a rich taxonomic bibliography was gathered, stimulating comparisons with the Brazilian malacofauna. We listed a total of 68 and 368 known shallow-water species (less than 200 m depth) from Antarctica and Brazil, respectively, in orde [...] r to find species, families and superfamilies in common, and to investigate how these malacofaunas differ in regard to these representative groups and their life habits. There are 23 superfamilies absent in Antarctica, but present in Brazil with at least one species; the reverse does not occur, as all superfamilies known from Antarctica are also recorded from Brazil. The number of Brazilian species is higher, being composed of a mixture of taxa from different biogeographical provinces, whereas in Antarctica there are only a few species adapted to its polar conditions, with minor components from elsewhere. Thus, many typical Caribbean species extend into Brazil, belonging to the diverse Arcoidea, Pectinoidea, Lucinoidea, Cardioidea, Veneroidea, and Tellinoidea. Cemented Ostreoidea, Plicatuloidea, Dimyoidea, Spondylidae (Pectinoidea), and Chamoidea are absent from Antarctica, as are wood (Teredinidae, Pholadoidea) and rock borers (Pholadidae, Pholadoidea; Gastrochaenoidea; and Lithophaginae, Mytiloidea). A large number o

Flávio Dias, Passos; Frederico Thomaisino, Magalhães.

274

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

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

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

2011-03-01

275

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  

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

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

2012-08-01

276

Características físicas e químicas do habitat da Biomphalaria tenagophila (Mollusca, Planorbidae) / Physical and chemical characteristics of the habitat of Biomphalaria tenagophila (Mollusca, Planorbidae)  

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Full Text Available SciELO Brazil | Language: Portuguese Abstract in portuguese Foram realizadas mensalmente, através de conchadas aleatórias, coletas de caramujos e de água, em uma pequena represa, visando a contribuir para o conhecimento das características físico-químicas da água e sua possível influência sobre alguns parâmetros, biológicos. Dos 17 fatores analisados, a Alca [...] linidade e a Condutividade se mostraram positivamente correlacionadas com a densidade de B. tenagophila (r = +0,224 e +0,290), enquanto que CO2 e Acidez se correlacionaram negativamente com densidade (r = -0,592 e -0,601). Alcalinidade e Dureza Total apresentaram valores um pouco acima de 100 mg/l de CaCO3; Condutividade e Cloretos, teores considerados altos para a região (680,1 ± 64,3micronS/cm e 94,9 ± 38,7 mg/l). Os demais fatores, como pH e OD, estiveram dentro dos padrões de águas brutas de abastecimento. As densidades de B. tenagophila foram mais baixas nos seis meses subseqüentes a um longo período de chuvas tortenciais (12 a 30 caramujos/ 90 conchadas/mês) e nos verões chuvosos. Nos meses mais frios de 1980 foram mais elevadas. Os diâmetros médios mensais foram sempre superiores a 13 mm, chegando a 21,4 ± 4,1 mm; mas a média da maioria dos meses girou em torno de 17 mm. Não houve correlação diâmetro/densidade (r = 0,037), nem densidade/temperatura (r = 0,065). Abstract in english Samples of water and snails collected through aleatory scoops in a small dam were done to obtain data concerning the physical and chemical characteristics of the water and their possible influence on biological aspects of the life cycle of snails. Among the 17 analysed parameters, Alkalinity and Con [...] ductivity showed a positive correlation with the density of B. tenagophila (r = +0.224 and r = +0.290), while CO2 and Acidity were negatively correlated with this populacional parameter (r = -0.592 and 0.601). Alkalinity and Total Hardness values were slightly higher than 100 mg/l CaCO3. Chlorides and Conductivity showed means of 94.9 ± 38.7 and 680.1 ± 643 microS/cm; these values are very high for that region. Other factors like pH and OD are according to the pattern for provision untreated waters. The density of B. tenagophila declined in the 6th month after a long period of torrential rains and in the rainy summers. In the colder months of the following year the density was higher (until 124 individuals/months/90 scoops). The monthly mean of the diameters of the snails was always larger than 13 mm, reaching 21.4 ± 4.1 mm, but the mode was about 17 mm. There was no correlation between diameter/density (r = 0.037) and density/temperature (r = 0.065).

Maria de Lourdes Machado, Grisolia; José Rabelo de, Freitas.

1985-06-01

277

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

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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.

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

278

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

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

Viviana M, Castillo; Donald I, Brown.

2008-06-01

279

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

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

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

2013-04-01

280

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

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

Gerlach, Justin

2007-01-01

 
 
 
 
281

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

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Full Text Available Using published records and original data from recent field work and revision of Iranian material of certain species deposited in the collections of the Natural History Museum Basel, the Zoological Museum Berlin, and Natural History Museum Vienna, a checklist of the freshwater gastropod fauna of Iran was compiled. This checklist contains 73 species from 34 genera and 14 families of freshwater snails; 27 of these species (37% are endemic to Iran. Two new genera, Kaskakia and Sarkhia, and eight species, i.e., Bithynia forcarti, B. starmuehlneri, B. mazandaranensis, Pseudamnicola georgievi, Kaskakia khorrasanensis, Sarkhia sarabensis, Valvata nowsharensis and Acroloxus pseudolacustris are described as new to science; Ecrobia grimmi (Clessin & Dybowski, 1888, Heleobia dalmatica (Radoman, 1974 and Hippeutis complanatus (Linnaeus, 1758 are reported for the first time from Iran. Additional field work is highly desirable for a more appropriate evaluation of the extant freshwater snail biodiversity in Iran.

Peter Glöer

2012-09-01

282

Development and Effects of Schistosoma Japonicum (Trematoda on its Intermediate Host, Oncomelania Hupensis (Gastropoda  

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Full Text Available 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 of the snails was recorded for 10 weeks. Snails in each group were checked for infection at seven weeks post-exposure. Positive snails were exposed to artifi­cial light from 06:00 am – 18:00 pm and the liberated cercariae were collected every 2 hours to determine the rhythmicity of cercarial release. Three groups of positive snails (n = 6 each were ex­posed to artificial light, daylight, and darkness from 06:00 am – 18:00 pm, the liberated cercariae were collected every 2 hours to determine the effects of light.Results: The highest infection rate and host mortality occurred among snails in the groups exposed to 15 and 20 miracidia. Cercariae were liberated after eight weeks of exposure of O. hupensis to S. japoni­cum. The circarial emerging pattern was circadian, with a single peak of emerging between 10:00 am and 12:00 pm. Light intensity had a positive influence on cercariae shedding and rhythmicity.Conclusion: Further research, including the influence of biotic and abiotic factors is deemed neces­sary to fine-tune elucidation of the effects of S. japonicum upon O. hupensis snail.

Y Sulieman

2013-06-01

283

Composición de ácidos grasos de los caracoles marinos Phyllonotus pomum y Chicoreus brevifrons (Gastropoda: Muricidae)  

Scientific Electronic Library Online (English)

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.

Haydelba, D’Armas; Dayanis, Yáñez; Dilia, Reyes; Gabriel, Salazar.

2010-06-01

284

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)

285

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)

286

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

287

Molecular analysis of Muticaria syracusana and M. neuteboomi from Southeastern Sicily, Italy (Gastropoda, Pulmonata, Clausiliidae  

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Full Text Available The genus Muticaria Lindholm, 1925, is currently distributed either in Southeastern Sicily or in the Malteseislands and comprises the species M. syracusana (Philippi, 1836, M. neuteboomi Beckmann, 1990 and M.macrostoma (Cantraine, 1835. For the first time, we report a molecular study on the topotypicous populationsof M. syracusana and M. neuteboomi carried out on fragments of the ribosomal 16S rDNA subunit and thecytochrome oxydase I (COI mitochondrial genes by Neighbour Joining, Maximum Likelihood, MaximumParsimony and Bayesian Inference algorithms. Our results revealed the existence of nucleotide-sequencedivergence (Dxy: 5% for 16S rDNA and 12% for COI sequences between the two taxa.

M. Stella Colomba

2010-12-01

288

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

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

Lucie Ju?i?ková

2009-12-01

289

Cryopreservation of mantle dissociated cells from Haliotis tuberculata (Gastropoda) and postthawed primary cell cultures.  

Science.gov (United States)

Dissociated mantle cells from the gastropod mollusc Haliotis tuberculata were cultured after a freezing-thawing procedure using either 10% dimethyl sulfoxide (Me(2)SO) or 10% glycerol (Gly) as a cryoprotector. The survival rate of 2-day-old cultured cryopreserved cells after thawing, based on analysis of DNA and protein contents, was nearly 80% in comparison with 2-day-old cultured fresh cells. Cells thawed after cryopreservation exhibited the maintenance of all tested physiological activities. Metabolic activity (measured by the MTT test) and the activity of alkaline phosphatase (a plasma membrane-bound enzyme) were not decreased in comparison to those in cultured fresh cells. In addition, cryopreserved cultured cells maintained a physiological stimulation ability in response to treatment with growth factors. These results taken together represent one of the most convincing demonstrations of the survival and of the recovery of intact functional activities of molluscan cells after a freeze-thawing procedure. Our results suggest that in the future primary cultures of cryopreserved mantle cells will be able to be used for fundamental research, in toxicity tests, or in the field of biotechnology. PMID:12061846

Poncet, J-M; Serpentini, A; Boucaud-Camou, E; Lebel, J-M

2002-02-01

290

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

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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.

Joong-Ki Park

2014-01-01

291

Three new species of Scissurellidae (Gastropoda, Prosobranchia) from the coast of Brazil  

Scientific Electronic Library Online (English)

Full Text Available SciELO Brazil | Language: English Abstract in portuguese Pela leitura das descrições originais dos gêneros de Scissurellidae , conclue-se que os nomes validos destes gêneros são: Scissurella d'Orbigny, 1823 (redescriçao por Sowerby, 1824), Anatoma Woodward, 1859, Inoisura Hedley,1904, Soissurona Iredale, 1924 e Sinezona Finlay, 1927. Scissurella e Anatoma [...] são cosmopolitas; o primeiro encontra-se geralmente em águas rasas e associado a algas; o segundo habita Iguas profundas. Os três últimos gêneros são restritos à Australásia. Três novas espécies são descritas para a costa do Brasil: Scissurella alexandrei, Soissurelía eleotilis e Scissurella morretesi. Da primeira foi estudada a anatomia interna. Estas tres espécies novas foram encontradas em ãguas rasas; S. alexandrei e S.eleotilis provem de amostras de algas do mesolitoral inferior. Conhece-se uma quarta espécie de Scissure11idae para o Brasil: Anatoma aedonia (Watson, 1886), dragada em 1873 pelo 'Challenger', ao largo da costa de Pernambuco, em profundidade de 640 m. Abstract in english A consultation of the original descriptions of the genera of Scissurellidae led the author to conclude that the valid names for the genera of this family are: Scissurella d'Orbigny, 1823 (redescription by Sowerby, 1824), Anatoma Woodward, 1859, Inoisura Hedley, 1904, Scissurona Iredale, 1924, Sinezo [...] na Finlay, 1927. Scissurella and Anatoma are cosmopolites, the first generally living in shallow waters, associated to sea-weeds, while the second is found in deep waters. The three last genera are restricted to Australasia. Three new species are described from the Brazilian coast: Soissu rella alexandrei, Scissurella eleotilis and Scissurella morretesi. The internal anatomy of S. alexandrei is described. These three new species have been found in littoral shallow waters, the two first on the northeast Brazilian coast, the third on the coast of the State of São Paulo. The fourth known species of Scissurellidae from Brazil, Anatoma aedonia (Watson, 1886), was dredged by H.M.S, "Challenger", in 1873, off Pernambuco, 350 fm (640 m).

Pierre Ch., Montouchet.

292

Three new species of Scissurellidae (Gastropoda, Prosobranchia from the coast of Brazil  

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Full Text Available A consultation of the original descriptions of the genera of Scissurellidae led the author to conclude that the valid names for the genera of this family are: Scissurella d'Orbigny, 1823 (redescription by Sowerby, 1824, Anatoma Woodward, 1859, Incisura Hedley, 1904, Scissurona Iredale, 1924, Sinezona Finlay, 1927. Scissurella and Anatoma are cosmopolites, the first generally living in shallow waters, associated to sea-weeds, while the second is found in deep waters. The three last genera are restricted to Australasia. Three new species are described from the Brazilian coast: Scissurella alexandrei, Scissurella electilis and Scissurella morretesi. The internal anatomy of S. alexandrei is described. These three new species have been found in littoral shallow waters, the two first on the northeast Brazilian coast, the third on the coast of the State of São Paulo. The fourth known species of Scissurellidae from Brazil, Anatoma aedonia (Watson, 1886, was dredged by H.M.S, "Challenger", in 1873, off Pernambuco, 350 fm (640 m.Pela leitura das descrições originais dos gêneros de Scissurellidae , conclue-se que os nomes válidos destes gêneros são: Scissurella d'Orbigny, 1823 (redescrição por Sowerby, 1824, Anatoma Woodward, 1859, Incisura Hedley,1904, Scissurona Iredale, 1924 e Sinezona Finlay, 1927. Scissurella e Anatoma são cosmopolitas; o primeiro encontra-se geralmente em águas rasas e associado a algas; o segundo habita águas profundas. Os três últimos gêneros são restritos à Australásia. Três novas espécies são descritas para a costa do Brasil: Scissurella alexandrei, Scissurella electilis e Scissurella morretesi. Da primeira foi estudada a anatomia interna. Estas três espécies novas foram encontradas em águas rasas; S. alexandrei e S.electilis provém de amostras de algas do mesolitoral inferior. Conhece-se uma quarta espécie de Scissurellidae para o Brasil: Anatoma aedonia (Watson, 1886, dragada em 1873 pelo 'Challenger', ao largo da costa de Pernambuco, em profundidade de 640 m.

Pierre Ch. Montouchet

1972-01-01

293

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

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

Ana-Maria P?pureanu; Heike Reise; András Varga

2014-01-01

294

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

Scientific Electronic Library Online (English)

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

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

1247-12-01

295

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

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

H.G. Nóblega

2003-09-01

296

The freshwater snails of the genus Bythinella Moquin-Tandon (Gastropoda: Rissooidea: Hydrobiidae from Montenegro  

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Full Text Available New records of freshwater snails of the genus Bythinella Moquin-Tandon from Montenegro are presented. Bythinella dispersa, 1973 and B. luteola Radoman, 1976 are recognized and defined as separate species; B. taraensis n. sp., which lives partially sympatric with B. dispersa in the canyon of the River Tara, is described as new. All Bythinella spp. in Montengro inhabit the Dinaric part of the Black Sea drainage area, while it is practically absent from the Adriatic drainage area.

Gloer P.

2010-01-01

297

Cellular and subcellular structure of anterior sensory pathways in Phestilla sibogae (Gastropoda, Nudibranchia).  

Science.gov (United States)

Two sensory-cell types, subepithelial sensory cells (SSCs) and intraepithelial sensory cells (ISCs), were identified in the anterior sensory organs (ASO: pairs of rhinophores and oral tentacles, and the anterior field formed by the oral plate and cephalic shield) of the nudibranch Phestilla sibogae after filling through anterior nerves with the neuronal tracers biocytin and Lucifer Yellow. A third type of sensory cells, with subepithelial somata and tufts of stiff-cilia (TSCs, presumably rheoreceptors), was identified after uptake of the mitochondrial dye DASPEI. Each sensory-cell type has a specific spatial distribution in the ASO. The highest density of ISCs is in the oral tentacles (approximately 1,200/mm2), SSCs in the middle parts of the rhinophores (>4,000/mm2), and TSCs in the tips of cephalic tentacles (100/mm2). These morphologic data, together with electrophysiologic evidence for greater chemical sensitivity of the rhinophores than the oral tentacles (Murphy and Hadfield [1997] Comp. Biochem. Physiol. 118A:727-735; Boudko et al. [1997] Soc. Neurosci. Abstr. 23:1787), led us to conclude that the two pairs of chemosensory tentacles serve different chemosensory functions in P. sibogae; i.e., ISCs and the oral tentacles serve contact- or short-distance chemoreception, and SSCs and the rhinophores function for long-distance chemoreception or olfaction. If this is true, then the ISC subsystem probably represents an earlier stage in the evolution and adaptations of gastropod chemosensory biology, whereas among the opisthobranchs, the SSC subsystem evolved with the rhinophores from ancestral cephalaspidean opisthobranchs. PMID:10075442

Boudko, D Y; Switzer-Dunlap, M; Hadfield, M G

1999-01-01

298

Composición de ácidos grasos de los caracoles marinos Phyllonotus pomum y Chicoreus brevifrons (Gastropoda: Muricidae  

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Full Text Available 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 mínimo 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.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 Phyllonotus 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.

Haydelba D’Armas

2010-06-01

299

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

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

Stanislava Y. Vasileva

2009-07-01

300

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

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Se estudió la tasa de crecimiento de caracoles cultivados en corrales en cuatro ambientes diferentes. El cultivo se realizó de octubre de 1993 a marzo de 1994. 16 corrales de 50 m² de área cada uno, cuatro por ambiente, fueron colocados en los siguientes ambientes: Thalassia, Thalassia-arena, Arena y Coral, todos dentro de la laguna arrecifal en Punta Gavilán y Banco Chinchorro. En cada ambiente se introdujeron 20 caracoles de las siguientes tallas: 1) 100-120, 2) 120-140, 3) 140-160 y 4...

Alberto de Jesús Navarrete

2001-01-01

 
 
 
 
301

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

Scientific Electronic Library Online (English)

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

Alberto de Jesús, Navarrete.

2001-03-01

302

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

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

Costa, J.; Gime?nez Casalduero, Francisca; Melo, Ricardo; Jesus, Bruno

2012-01-01

303

A new species of Nassarius (Gastropoda: Nassariidae) from the western Pacific Ocean  

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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.

Zhang, Suping

2013-03-01

304

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

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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.

Marcos G., Papp; Luiz F.L., Duarte.

305

Elements of cold hardiness in a littoral population of the land snail Helix aspersa (Gastropoda: Pulmonata).  

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The land snail Helix aspersa can be considered partially tolerant to freezing, in the sense it can survive some ice formation within its body for a limited time, and possesses a limited ability to supercool. This study aimed at understanding what factors are responsible for the variation of the temperature of crystallization ( Tc) in a littoral temperate population. The ability to supercool was maximal (ca. -5 degrees C) during dormancy periods (hibernation and aestivation) and minimal (ca. -3 degrees C) during spring and autumn, in relation with the decrease of water mass and the increase of osmolality. Tc decreased in October to remain stable through late autumn and winter; it increased quickly with the awakening of animals in April. Snails with an epiphragm had a significantly higher ability to supercool (ca. -4.8 degrees C) than snails which did not form an epiphragm (ca. -4.2 degrees C). The animals' size had a weak but significant influence on the realization of the Tc. It appeared that there was not a real cold-hardiness strategy in this population; rather a sum of parameters, varying in consequences of the external conditions and of the activity cycle, which are responsible for the enhancement of the supercooling ability during winter. PMID:12355230

Ansart, A; Vernon, P; Daguzan, J

2002-10-01

306

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

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

Eduardo Carvalho Silva

2010-10-01

307

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

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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 coef...

Eduardo Carvalho Silva; Joseline Molozzi; Marcos Callisto

2010-01-01

308

Angiostrongylus costaricensis (Nematoda: Protostrongylidae): migration route in experimental infection of Omalonyx sp. (Gastropoda: Succineidae).  

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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

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

309

Molecular phylogeny and biogeography of the endemic Hawaiian Succineidae (Gastropoda: Pulmonata).  

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The endemic Hawaiian Succineidae represent an important component of the exceptionally diverse land snail fauna of the Hawaiian Islands, yet they remain largely unstudied. We employed 663-bp fragments of the cytochrome oxidase I (COI) mitochondrial gene to investigate the evolution and biogeography of 13 Hawaiian succineid land snail species, six succineid species from other Pacific islands and Japan, and various outgroup taxa. Results suggest that: (1) species from the island of Hawaii are paraphyletic with species from Tahiti, and this clade may have had a Japanese (or eastern Asian) origin; (2) species from five of the remaining main Hawaiian islands form a monophyletic group, and the progression rule, which states that species from older islands are basal to those from younger islands, is partially supported; no geographic origin could be inferred for this clade; (3) succineids from Samoa are basal to all other succineids sampled (maximum likelihood) or unresolved with respect to the other succineid clades (maximum parsimony); (4) the genera Succinea and Catinella are polyphyletic. These results, while preliminary, represent the first attempt to reconstruct the phylogenetic pattern for this important component of the endemic Hawaiian fauna. PMID:15019623

Rundell, Rebecca J; Holland, Brenden S; Cowie, Robert H

2004-04-01

310

[In vitro development of hemolymph granulocytes of Biomphalaria glabrata (Gastropoda, Planorbidae). Study by scanning electron microscopy].  

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The morphological evolution in vitro of Biomphalaria glabrata granulocytes on a cover-glass is described by scanning electron microscopy. 4 stages have been characterized: stage 1: globular cells showing low adhesion to cover-glass; stage 2: flattened cells in contact with substrate over a large surface, which present two well differentiated cytoplasmic zones: an endoplasm in which the nucleus is embedded and an ectoplasm which extends into very thin filopodia with a spherical terminal bulb; stage 3: cells which are very flattened and which adhere to each other; stage 4: cells which are completely spread on the cover-glass, in which the ectoplasm includes the filopodia. These 4 stages probably represent the granulocyte ontogenetic stages in their role in cellular defense against foreign substances. PMID:6508142

Morona, D; Jourdane, J; Aeschlimann, A

1984-01-01

311

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

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

Jorge L., Ramirez; Rina, Ramírez.

312

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

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

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

313

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

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

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

2011-12-01

314

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

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

Olivier Gargominy

2008-01-01

315

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

Science.gov (United States)

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.

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

2006-01-01

316

Natural infection of Fasciola hepatica (Trematoda: Fasciolidae) in Bulinus truncatus (Gastropoda: Planorbidae) in northern Tunisia.  

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Monthly samples of Bulinus truncatus were collected during a year from a cattle-breeding farm located in the region of Sejnane (North Tunisia) to detect natural infections with Fasciola hepatica and determine seasonal variations of the prevalence throughout a year. Of the 163 adult bulinids, larval forms of F. hepatica were found in 39% of snails. Two peaks in prevalence, the first in June and the second in October, were also noted. Bulinus truncatus can be added to the list of potential intermediate hosts of F. hepatica. PMID:19193249

Hamed, N; Hammami, H; Khaled, S; Rondelaud, D; Ayadi, A

2009-09-01

317

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

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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

Ndassa, Arouna; Mimpfoundi, Remy; Elizabeth, McClymont

2007-01-01

318

Strong genetic structure in Cameroonian populations of Bulinus truncatus (Gastropoda: Planorbidae), intermediate host of Schistosoma haematobium.  

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In order to evaluate the snail host contribution on the variability of mollusk/schistosome compatibility, the genetic structure of seven Cameroonian populations of the schistosome vector, Bulinus truncatus, was studied using four variable microsatellite loci. A substantial polymorphism mainly distributed among populations was observed. No heterozygous genotype was scored, confirming the high level of selfing rate occurring in B. truncatus populations. Contemporaneous samples were highly and significantly differentiated with a marginally significant correlation with geographical distances (P-value=0.069). The different sites sampled seemed to rarely exchange migrants with very small Nm (?0.22 or below). The data also suggest that B. truncatus subpopulations might be composed of very small and isolated units at much smaller surfaces than what was investigated. Even if more data (in particular more loci) will be needed to confirm these issues, they suggest that restricted gene flow plays an important role in maintaining differentiation among snail populations in the transmission foci, potentially leading to specific adaptation between each B. truncatus population and its local Schistosoma haematobium population. PMID:21075219

Djuikwo-Teukeng, F F; Njiokou, F; Nkengazong, L; De Meeûs, T; Ekobo, A Samè; Dreyfuss, G

2011-01-01

319

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

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

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

1079-10-01

320

Histopathological effects of copper and lithium in the ramshorn snail, Marisa cornuarietis (Gastropoda, Prosobranchia).  

Science.gov (United States)

The aim of this study was to determine and quantify effects of copper and lithium in tissues of early juveniles of the ramshorn snail, Marisa cornuarietis. For this purpose, hatchlings of M. cornuarietis were exposed for 7d ays to a range of five different sublethal concentrations of copper (5, 10, 25, 50, and 75 ?g Cu²?L?¹) and lithium (50, 100, 200, 1000, and 5000 ?g Li? L?¹). Both metals changed the tissue structure of epidermis, hepatopancreas, and gills, varying between slight and strong reactions, depending on the copper and lithium concentration. The histopathological changes included alterations in epithelial and mucous cells of the epidermis, swelling of hepatopancreatic digestive cells, alterations in the number of basophilic cells, abnormal apices of digestive cells, irregularly shaped cilia and changes in the amount of mucus in the gills. The most sensible organ in M. cornuarietis indicating Cu or Li pollution is the hepatopancreas (LOECs were 10 ?g Cu²? L?¹, or 200 ?g Li? L?¹). In epidermis, mantle and gills relevant effects occurred with higher LOECs (50 ?g Cu²? L?¹, or 1000 ?g Li? L?¹). Base on LOECs, our results indicated that histopathological endpoints are high sensitivity to copper and lithium compared to endpoints for embryonic developmental toxicity. PMID:21840034

Sawasdee, Banthita; Köhler, Heinz-R; Triebskorn, Rita

2011-10-01

 
 
 
 
321

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

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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.

Ana R. A. Coelho

2012-07-01

322

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

Science.gov (United States)

The quality and safety parameters of mixed marinated seafood salad containing common octopus (Octopus vulgaris), shrimp (Parapenaeus longirostris), European squid (Loligo vulgaris), sea snail (Rapana thomasiana) and common cuttlefish (Sepia officinalis) at 4 degrees C during storage of 24 weeks were investigated. In addition, the nutritional value in terms of proximate and fatty acid composition of seafood salad was also determined. Sensory scores of seafood salad in terms of appearance, odour, flavour and texture slightly decreased th