Tusk shells, discovered in 1862, belong to the phylum Mollusca.
The tusk shells or tooth shells, technically the Scaphopoda /skfpd/ (the scaphopods /skfpdz/, from Ancient Greek  skaphe "boat" and  pous "foot"), are members of a class of shelled marine mollusc with worldwide distribution, and are the only class of exclusively infaunal marine molluscs. Phylum: Mollusca Class: Scaphopoda
Bronn, 1862 
