Antalis is a genus of tusk shells, marine scaphopod mollusks. The mantle of a scaphopod is entirely within the shell. The veliger is the characteristic larva of the gastropod, bivalve and scaphopod taxonomic classes. Gadilida is an order of very small tusk shells, marine scaphopod molluscs. These tusk shells are a kind of seashell, specifically the shells of scaphopod mollusks. Dentalium elephantinum, the elephant tusk, is a species of scaphopod mollusc. The morphological shape of the scaphopod body makes it difficult to orient it satisfactorily. Dentaliidae is a family of relatively large tusk shells, scaphopod mollusks in the order Dentaliida.