Retusidae

Retusidae is a family of very small sea snails, barrel-bubble snails, marine opisthobranch gastropod mollusks. These are headshield slugs, in the superfamily Bulloidea.

species of mollusc

Retusa is a genus of very small head-shield sea snails or barrel-bubble snails, marine gastropod molluscs in the family Retusidae.

species of mollusc