Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Autobranchia Grobben, 1894
     Superorder Heteroconchia Gray, 1854
       Clade Palaeoheterodonta Newell, 1965
         Order Unionida Gray, 1854
           Superfamily †Trigonioidoidea Cox, 1952
             1 Family †Trigonioididae Cox, 1952
             2 ?Family †Jilinoconchidae Ma, 1989
             3 Family †Nakamuranaiadidae Guo, 1981
             4 Family †Plicatounionidae Chen, 1987
             5 Family †Pseudohyriidae Kobayashi, 1968
             6 Family †Sainschandiidae Kolesnikov, 1977