Pteropoda (Gastropoda, Thecosomata e Gymnosomata) coligidos ao largo dos arquipélagos de S？o Pedro e S？o Paulo, costa nordeste, Brasil

pteropoda studies were carried out offshore s？o pedro and s？o paulo archipelago (0o56'2"n e 29o20'6"w) to assess biodiversity and spatial distribution. a bongo net (mesh size 300 micrometer) was hauled obliquely from a depth between 0 and 50 m and oand 100 m by the revizee-score/ne i oceanographic expedition on board of the brazilian navy oceanographic ship antares. samples were collected at 16 stations from september to october 1995. a total of 880 organisms distributed in 20 species, 14 genera and 9 families were identified. at the layer 0-50 m, creseis virgula (rang (828) was the most frequent species (71.43%), followed by limacina inflata (orbigny, (836) and cavolinia inflexa (lesueur, 18(3) (64.28%, each). ln terms of relative abundance outranked l. inflara (varying between 57.5 and 92.24%) and c. virgula (varying between 60.0 and 72.73%). at the layer 0-100 m, c. virgula was very frequent (80%), l. inflata (70%) and cuvierina columnella (rang (827) (40%) were frequent, other species had less than 30% of frequency. l. inflata varied from 37.5 to 100% and c. virgula from 42.42 to 100% of relative abundance. species diversity varied from medium to low ( < 2.0 bits.ind-1) in both layers. at the layer 0-50 m c. virgula was directly correlated to temperature and salinity, while at the layer 0-100 m l. inflata was correlated to these parameters, showing that these species are tropical water indicators.