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