ABSTRACT. Pteropoda (Gastropoda, Thecosomata and Gymnosomata) collected along the northeast coast of the archipelago of São Pedro and São Paulo, Brazil. Pteropoda studies were carried out offshore São Pedro and São Paulo Archipelago (0056'2"N e 29OZ0'6"W) to assess biodiversity and spatial distribution. A Bongo net (mesh size 300 micrometer) was hauled obliquely from a depth between O and 50 m and O and 100 m by the REVIZEE-SCOREINE I oceanographic expedition on board of the Brazilian Navy Oceanographic Ship Antares. Samples were collected at 16 stations from Septemberto October 1995. A total of880 organisms distributed in 20 species, 14 genera and 9 families were identified. At the layer O-50 m, Creseis virgula (Rang 1828) was the most frequent species (71.43%), followed by Lil1lacina infla/a (Orbigny , 1836) and Cavolinia inflexa (Lesueur, 1813) (64.28%, each).ln terms ofrelative abundance outranked L. inflara (varying between 57.5 and 92.24%) and C. virgula (varying between 60.0 and 72.73%). At the layerO-lOO m, C. virgula was very frequent (80%), L. infla/a (70%) and Cuvierilla colul1lnella (Rang 1827) (40%) were frequent, other species had less than 30% of frequency. L. infla/a varied from 37.5 to 100% and C. virgula from 42.42 to 100% of relative abundance. Species diversity varied from medium to low « 2.0 bits.ind o !) in both layers. At the layer O-50 m C. virgula was directIy correlated to temperature and salinity, while at the layer O-I 00 m L. inflara was correlated to these parameters, showing that these species are Tropical Water indicators. KEY WORDS . Pteropoda, Diversity, Spatial distribution, North-east, Brazil Os pterópodos são pequenos moluscos pelágicos adaptados à vida planctônica. Devido a diferenças morfológicas, os Pteropoda são separados em duas ordens: Thecosomata e Gymnosomata. Os primeiros possuem concha espiralada, plana ou cônica, enquanto que os Gymnosomata caracterizam-se por sua ausência (MAGALD I 1981).Conhecidos desde o século XVII, apresentam uma ampla distribuição oceânica, sendo assim de grande interesse para o conhecimento dos ecossistemas marinhos (LALLI & WELL 1973). A importância desse grupo está relacionada com sua posição na cadeia trófica, tanto como consumidores do micro e nanoplâncton , como alimento para espécies de peixes forrageiros. Quando ocorrem em grandes concentrações, constituem uma parcela significativa na biomassa zooplanctônica (RESGALLA & MONTÚ 1994). Algumas espécies são consideradas como excelentes
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