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 Pleurobemini Hannibal, 1912
                 1 Genus Pleurobema Rafinesque, 1819
                 2 Genus Elliptio Rafinesque, 1819
                 3 Genus Fusconaia Simpson, 1900
                 4 Genus Hemistena Rafinesque, 1820
                 5 Genus Lexingtonia Ortmann, 1914
                 6 Genus Plethobasus Simpson, 1900
                 7 Genus Uniomerus Conrad, 1853