Class Scaphopoda Bronn, 1862 - tusk shells
Order Gadilida Starobogatov, 1974
Suborder Gadilimorpha Steiner, 1992
Family Gadilidae Stoliczka, 1868
Subfamily Siphonodentaliinae Tryon, 1884
1 Genus †Calstevenus Yancey, 1973
2 Genus Dischides Jeffreys, 1867
3 Genus Polyschides Pilsbry & Sharp, 1898
4 Genus Sagamicadulus Sakurai & Shimazu, 1963
5 Genus Siphonodentalium Sars, 1859
6 Genus Striocadulus Emerson, 1962