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 Veneroidea Rafinesque, 1815
           Family Veneridae Rafinesque, 1815 - venus clams
             Subfamily Pitarinae Stewart, 1930 see Subfamily Callocardiinae Dall, 1895
               Genus Callocardia Adams, 1864
                 1 Subgenus Agriopoma Dall, 1902
                 2 Subgenus Aphrodora Jukes-Browne, 1914
                 3 Subgenus Atopodonta Cossmann, 1886
                 4 Subgenus Nitidavenus Vokes, 1939