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
           1 Family Mutelidae Gray, 1847 see Subfamily Iridininae Swainson, 1840
           2 Family Mycetopodidae Gray, 1840
           3 Family Etheriidae Deshayes, 1832 - freshwater oysters