Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Autobranchia Grobben, 1894
     Superorder Heteroconchia Gray, 1854
       Clade Heterodonta Neumayr, 1884
         Order Pholadomyida Newell, 1965
           Superfamily †Edmondioidea King, 1850
             1 Family †Edmondiidae King, 1850
             2 Family †Pachydomidae Fischer, 1887