Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Autobranchia Grobben, 1894
     Superorder Heteroconchia Gray, 1854
       Clade Palaeoheterodonta Newell, 1965
         Order Unionida Gray, 1854
           ?Superfamily †Archanodontoidea Modell, 1957 [monotypic]
             1 Family †Archanodontidae Modell, 1957