Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Autobranchia Grobben, 1894
     Superorder Heteroconchia Gray, 1854
       Clade Palaeoheterodonta Newell, 1965
         Order Unionida Gray, 1854
           Superfamily Hyrioidea Swainson, 1840 [monotypic]
             Family Hyriidae Swainson, 1840
               Subfamily Hyriinae Swainson, 1840
                 1 Tribe Hyriini Swainson, 1840
                 2 Tribe Hyridellini McMichael, 1955 (1934)
                 3 Tribe Castaliini Morretes, 1949
                 4 Tribe Diplodontini Ihering, 1901