Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Autobranchia Grobben, 1894
     Superorder Heteroconchia Gray, 1854
       Clade Heterodonta Neumayr, 1884
         Order Venerida Gray, 1854
           Superfamily Mactroidea Lamarck, 1809
             1 Family Mactridae Lamarck, 1809 - surf clams
             2 Family Anatinellidae Gray, 1853
             3 Family Cardiliidae Fischer, 1887
             4 Family Mesodesmatidae Gray, 1840