Order Cardiida Ferussac 1822 (clam)
Parent taxon: Cardiiformii according to J. G. Carter et al. 2011
Sister taxa: Hippuritida, Megalodontida, Modiomorphida
Subtaxa: Anthracosiidina, Cardiidina, Gastrochaenidina, Kalenteroidea, Leptonidina
Ecology: facultatively mobile infaunal suspension feeder