Class Scaphopoda is a marine class of invertebrate animals that includes tusk shells, tooth shells, and elephant's tusk shells. These animals are characterized by their elongated, tubular shells that resemble a tusk or a tooth. Synonyms for Class Scaphopoda include the subclass Prosobranchia, the order Dentaliida, and the family Dentaliidae. Some of the common names for members of this class include "tusk shells," "dentalium shells," and "tooth shells." Despite their varied names, all members of Class Scaphopoda have a similar structure and feeding habits, which involve burying themselves in sediment and filter-feeding on small organisms.