Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Heterodonta Neumayr, 1884 see Clade Heterodonta Neumayr, 1884
       Order Chamida see Order Venerida Gray, 1854
         Superfamily Mactroidea Lamarck, 1809
           1 Family Mactridae Lamarck, 1809 - surf clams
           2 Family Anatinellidae Gray, 1853 [monotypic]
           3 Family Cardiliidae Fischer, 1887
           4 Family Mesodesmatidae Gray, 1840