Phrontis tiarula

Phrontis tiarula, common name the western mud nassa, is a species of small sea snail with gills and an operculum, a marine gastropod mollusc in the family Nassariidae, the nassa mud snails or dog whelks.

Description
The length of the shell varies between 9 mm and 20 mm.

Distribution
This species occurs in the Pacific Ocean from California to Mexico.

Feeding habits
These snails are exclusively scavengers.