Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Palaeoheterodonta Newell, 1965 see Clade Palaeoheterodonta Newell, 1965
       Order Unionida Gray, 1854
         Superfamily Unionoidea Rafinesque, 1820
           Family Hyriidae Swainson, 1840
             Subfamily Hyriinae Swainson, 1840
               Genus Triplodon Spix, 1827
                 1 Subgenus Triquetrana Simpson, 1900