Nassarius coronulusNassarius coronulus, commonly known as the small crown dog whelk, is a species of sea snail, a marine gastropod mollusc in the family Nassariidae, the Nassa mud snails or dog whelks.DescriptionThe shell grows to a length of 15 mm.DistributionThis species occurs in the Red Sea and in the Indian Ocean offshore of Madagascar and the Mascarene Basin.