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
             Subfamily Lutrariinae Gray, 1853
               Genus Lutraria Lamarck, 1799
                 1 Subgenus Goniomactra Mayer, 1867
                 2 Subgenus Lutromactra Iredale, 1929
                 3 Subgenus Lutrophora Dall, 1895