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
             1 Subfamily Unioninae Rafinesque, 1820
             2 Genus Odhnerella Modell, 1964
             3 Genus Pseudocoelatura Vokes, 1980, orth. inval. see Genus Pseudocaelatura Germain, 1921
             4 Genus Rhabdotophorus Russell, 1935
             5 Genus Richtofenia Vokes, 1980, orth. inval. see Genus Richthofenia Modell, 1964, nom. illeg.
             6 Genus Scriptolamprotula Modell, 1964
             7 Genus Tuberunio Lindholm, 1932
             8 Subfamily Anodontinae Rafinesque, 1820 see Tribe Anodontini Rafinesque, 1820
             9 Subfamily Ambleminae Rafinesque, 1820