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Ceratostoma foliatum.jpg
A live individual of Ceratostoma foliatum, in situ on a rock
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Caenogastropoda
clade Hypsogastropoda
clade Neogastropoda
Superfamily: Muricoidea
Family: Muricidae
Subfamily: Ocenebrinae
Genus: Ceratostoma
Herrmannsen, 1846

Ceratostoma, common name the "hornmouth" snails, is a genus of medium to large predatory sea snails, marine gastropod mollusks in the family Muricidae, the rock snails.

This genus should not be confused with the nudibranch genus Ceratosoma, meaning "thorn body". Ceratostoma means "thorn mouth" because of the thorn-like projection on the edge of the aperture, used as a tool in predation to prop open the shells of bivalves and barnacles.


Species within the genus Ceratostoma include:

Species brought into synonymy: