Class Bivalvia Linnaeus, 1758 - bivalves
Subclass Autobranchia Grobben, 1894
Superorder Heteroconchia Gray, 1854
Clade Heterodonta Neumayr, 1884
Order Pholadomyida Newell, 1965
Superfamily Pholadomyoidea King, 1844
Family †Grammysiidae Miller, 1877
1 Subfamily †Grammysiinae Miller, 1877
2 Subfamily †Cuneamyinae Morris, Dickins & Astafieva-Urbajtis, 1991