Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Anomalodesmata Dall, 1889 [monotypic] see Order Anomalodesmata Dall, 1889
       Order Pholadomyida Newell, 1965
         Suborder Cuspidariina see Superfamily Cuspidarioidea Dall, 1886
           Family Cuspidariidae Dall, 1886
             Genus Cuspidaria Nardo, 1840
               Subgenus Tropidomya Dall & Smith, 1886 see Genus Tropidomya Dall & Smith, 1886