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
               01 Genus Prisodon Schumacher, 1817
               02 Genus Callonaia Simpson, 1900
               03 Genus Castalia Lamarck, 1819
               04 Genus Castaliella Simpson, 1900
               05 Genus Castalina Ihering, 1891
               06 Genus Chevronais Olsson & Wurtz, 1951
               07 Genus Diplodon Spix, 1827
               08 Genus Diplodontites Marshall, 1922
               09 Genus Echyridella McMichael & Hiscock, 1958
               10 Genus Ecuadorea Marshall & Bowles, 1932
               11 Genus Hyridella Swainson, 1840
               12 Genus Mesohyridella McMichael, 1957
               13 Genus Paxyodon Schumacher, 1817
               14 Genus Triplodon Spix, 1827