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
Family †Trigonioididae Cox, 1952
1 Subfamily †Trigonioidinae Cox, 1952
2 Subfamily †Americunioninae Guo, 1986
3 Subfamily †Danlengiconchinae Sha, 1993
4 Subfamily †Martinsonellinae Sha, 1993
5 Subfamily †Peregrinoconchinae Gu, Chen & Lan, 1976