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