†order Megalodontida Starobogatov 1992 (clam)
Parent taxon: Cardiiformii according to J. G. Carter et al. 2011
See also Bouchet et al. 2010
Sister taxa: Cardiida, Hippuritida, Modiomorphida
Subtaxa: Mecynodontoidea Megalodontoidea
Ecology: facultatively mobile infaunal suspension feeder