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
           Family Mactridae Lamarck, 1809 - surf clams
             1 Subfamily Mactrinae Lamarck, 1809
             2 Subfamily Lutrariinae Gray, 1853
             3 Subfamily Pteropsellinae Keen, 1969 see Subfamily Kymatoxinae Stenzel & Krause, 1957
             4 Subfamily Zenatiinae Dall, 1895