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A new subgenus and three new species of Brazilian deep water Olivella Swainson, 1831 (Mollusca, Gastropoda, Olivellidae) collected by the RV Marion Dufresne in 1987

Ricardo S. ABSALÃO & Alexandre D. PIMENTA

en Zoosystema 25 (2) - Pages 177-185

Published on 27 June 2003

Anasser n. subgen., a new subgenus of Olivella Swainson, 1831, is proposed based on the absence of any kind of pillar structure and the presence of a parietal callus reaching the apertural end but not above it. Three new species are described from Brazilian deep waters: Olivella (Anasser) careorugula n. sp. is medium sized, oblong outline, whorls strongly convex and with a large subsutural white band; Olivella (Olivina) hyphala n. sp. is large, relatively big-belled and presents a milk-white subsutural belt; and Olivella (Olivina ) klappenbachi n. sp. is medium sized, roughly obconic, resembling a whirligig with protoconch large and rounded.


Keywords:

Mollusca, Gastropoda, Olivellidae, Olivella, Olivina, Anasser n. subgen., deep water, Brazil, new subgenus, new species.

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ABSALÃO R. S. & PIMENTA A. D. 2003. — A new subgenus and three new species of Brazilian deep water Olivella Swainson, 1831 (Mollusca, Gastropoda, Olivellidae) collected by the RV Marion Dufresne in 1987. Zoosystema 2003 (2): 177-185.