Superfamily Unionoidea Fleming 1828 (clam)
Alternative spelling: Unionacea
Parent taxon: Unionidina according to J. G. Carter et al. 2011
Sister taxon: Mullerioidea
Subtaxa: Actinodontophoridae, Margaritiferidae, Mutelidae, Sancticarolitidae, Unionidae
Ecology: facultatively mobile infaunal suspension feeder