Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Autobranchia Grobben, 1894
     Superorder Heteroconchia Gray, 1854
       Clade Palaeoheterodonta Newell, 1965
         Order Unionida Gray, 1854
           Superfamily Etherioidea Deshayes, 1832
             1 Family Etheriidae Deshayes, 1832 - freshwater oysters
             2 Family Iridinidae Swainson, 1840
             3 Family Mycetopodidae Gray, 1840