Subclass Palaeoheterodonta Newell 1965 (clam)
Alternative spelling: Paleoheterodonta
Synonym: Uniomorphi Gray 1854
Full reference: N. D. Newell. 1965. Classification of the Bivalvia. American Museum Novitates 2206:1-25
Parent taxon: Heteroconchia according to R. Bieler et al. 2014
See also Bieler and Mikkelsen 2006, Bouchet et al. 2010, Carter et al. 2011, Cope 1996, Cope 1997, Giribet and Wheeler 2002, Newell 1965, Shoshani et al. 1989 and Vokes 1980
Sister taxa: Archiheterodonta, Eoastartella, Euheterodonta, Heterodonta, Heterodonta, Lipanellidae, Parenia
Subtaxa: Thoraliidae Trigoniida Unioni Unionida
Ecology: facultatively mobile infaunal suspension feeder