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 Unionidae Rafinesque, 1820 - pearly mussels
             Subfamily Ambleminae Rafinesque, 1820
               Tribe Amblemini Rafinesque, 1820
                 01 Genus Amblema Rafinesque, 1820
                 02 Genus Balwantia Prashad, 1919
                 03 Genus Caelatura orth. inval. see Genus Coelatura Conrad, 1853
                 04 Genus Cokeria Marshall, 1916
                 05 Genus Contradens Haas, 1913
                 06 Genus Cyclonaias Pilsbry, 1922
                 07 Genus Discomya Simpson, 1900
                 08 Genus Ensidens Frierson, 1911
                 09 Genus Lamellidens Simpson, 1900
                 10 Genus Lamprotula Simpson, 1900
                 11 Genus Magnonaias Utterback, 1915, nom. rej.
                 12 Genus Nitia Pallary, 1924
                 13 Genus Orthonymus Agassiz, 1852
                 14 Genus Parreysia Conrad, 1853
                 15 Genus Plectomerus Conrad, 1853
                 16 Genus Popenaias Frierson, 1927
                 17 Genus Potomida Swainson, 1840
                 18 Genus Pseudobaphia Simpson, 1900
                 19 Genus Pseudodon Gould, 1844
                 20 Genus Psoronaias Crosse & Fischer, 1894
                 21 Genus Quadrula Rafinesque, 1820
                 22 Genus Quincuncina Ortmann, 1922
                 23 Genus Rhombuniopsis Haas, 1920
                 24 Genus Rotundaria Rafinesque, 1820
                 25 Genus Schepmania Haas, 1910
                 26 Genus Trapezoideus Simpson, 1900
                 27 Genus Tritogonia Agassiz, 1852