Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Palaeoheterodonta Newell, 1965 see Clade Palaeoheterodonta Newell, 1965
       Order Unionida Gray, 1854
         01 Superfamily Unionoidea Rafinesque, 1820
         02 Superfamily Muteloidea Gray, 1847 see Superfamily Etherioidea Deshayes, 1832
         03 Genus Aximedia Rafinesque, 1820
         04 Genus Coelatura Conrad, 1853
         05 Genus Diplasma Rafinesque, 1831
         06 Genus Hemisolasma Rafinesque, 1831
         07 Genus Lapidosus Simpson, 1900
         08 Genus Leucosilla Rafinesque, 1831
         09 Genus Limnoica Gray, 1857
         10 Genus Mya sensu Röding, 1798
         11 Genus Nemrodia Pallary, 1939
         12 Genus Schizostoma Schlüter, 1838, nom. nud.
         13 Genus Securilla Drouët, 1855