Class Bivalvia Linnaeus, 1758 - bivalves
   Subclass Autobranchia Grobben, 1894
     Superorder Heteroconchia Gray, 1854
       Clade Palaeoheterodonta Newell, 1965
         Order Unionida Gray, 1854
           Superfamily Unionoidea Rafinesque, 1820
             Family Unionidae Rafinesque, 1820 - pearly mussels
               1 Subfamily Unioninae Rafinesque, 1820
               2 Subfamily Gonideinae Ortmann, 1916
               3 Subfamily Ambleminae Rafinesque, 1820
               4 Subfamily Coelaturinae Modell, 1942
               5 Subfamily Modellnaiinae Brandt, 1974
               6 Subfamily Parreysiinae Henderson, 1935
               7 Subfamily †Qiyangiinae Chen, 1983
               8 Subfamily Rectidentinae Modell, 1942