Wikipedia
Pachyoliva
Pachyoliva (Olsson 1956) is a subgenus of small sea snails, marine gastropod mollusks in the genus Olivella within the family Olivellidae, the dwarf olives. Species in this subgenus inhabit soft sediments in the intertidal (or eulittoral) and subtidal (or sublittoral) zones of sandy beaches of the Panamic faunal province, that is, the west coast of the Americas from Baja California to north Peru.