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| Ceratostoma | |
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| A live individual of Ceratostoma foliatum, in situ on a rock | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Neogastropoda |
| Superfamily: | Muricoidea |
| Family: | Muricidae |
| Subfamily: | Ocenebrinae |
| Genus: | Ceratostoma Herrmannsen, 1846 |
| Synonyms | |
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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. [1]
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.