Nassarius oneratusNassarius oneratus, common name the loaded nassa, is a species of sea snail, a marine gastropod mollusc in the family Nassariidae, the nassa mud snails or dog whelks.DescriptionThe length of the shell varies between 10 mm and 18 mm.DistributionThis species occurs in the Indo-West Pacific off La Réunion and the Mascarene Basin; also off the Solomon Islands.