Phylum Mollusca Linnaeus, 1758 - molluscs
   Class Bivalvia Linnaeus, 1758 - bivalves
     Subclass Palaeoheterodonta Newell, 1965 see Clade Palaeoheterodonta Newell, 1965
       Order Unionida Gray, 1854
         Superfamily Muteloidea Gray, 1847 see Superfamily Etherioidea Deshayes, 1832
           Family Etheriidae Deshayes, 1832 - freshwater oysters
             1 Genus Etheria Lamarck, 1807
             2 Genus Acostaea d'Orbigny, 1851
             3 Genus Bartlettia Adams, 1867
             4 Genus Pseudomulleria Anthony, 1907