Superfamily Unionoidea Fleming 1828 (clam)
Alternative spelling: Unionacea
Parent taxon: Unionidina according to J. G. Carter et al. 2011
See also Beu et al. 1990, Bieler and Mikkelsen 2006, Bouchet et al. 2010, Nevesskaja 2009, Newell 1965 and Vokes 1980
Sister taxon: Mullerioidea
Subtaxa: Actinodontophoridae Margaritiferidae Mutelidae Pachycardiidae Sancticarolitidae Unionidae
Ecology: facultatively mobile infaunal suspension feeder