What is "fissurellidae"

Fissurellidae \Fissurellidae\ n. a natural family of marine limpets.

Syn: family Fissurellidae.

Fissurellidae, common name the keyhole limpets and slit limpets, is a taxonomic family of limpet-like sea snails, marine gastropod molluscs in the clade Vetigastropoda. Their common name derives from the small hole in the apex of their cone-like shells. Although superficially resembling other "true" limpets, they are in fact not closely related to them.

Fissurellidae is the only family in the superfamily Fissurelloidea.