Wikipedia
Ampullinidae
Ampullinidae are an mostly extinct taxonomic family of deep-water sea snails, marine gastropod molluscs in the clade Caenogastropoda.
The shells of species in this family resemble those of naticids. Sea snails of this family lived from the Triassic period to the Pliocene age of the Cenozoic.
But when the extant species Cernina fluctuata is considered as a member of this family, then Ampullinidae is extant.