Abstract
A thiarid gastropod, Vinundu westae new genus and new species, is described from Lake Tanganyika, and the species Nassopsis guillemei Martel & Dautzenberg, 1899 is transferred to this new genus from Edgaria (� Lavigeria). The shell of Vinundu has equal axial and spiral macrosculpture, producing characteristic regular nodes at the sculptural intersections. Reproduction in Vinundu is oviparous, in contrast to the ovoviviparous habit of its sister group, Lavigeria. Radular teeth and isotope values indicate that this is a grazer. Vinundu species are readily distinguished from their sister clade Lavigeria by conchological, anatomical and molecular characters. The two Vinundu species are common in deep water, rocky habitats of this clear-water, ancient lake.
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