†order Cyrtodontida Scarlato and Starobogatov 1971 (clam)
Cope (1996: p. 1010) explicitly claims to be the authority for this order, but others (e.g., Larghi, 2005) consider it emended by Cope (1996) with original authority Scarlato and Starobogatov (1971) in Nevesskaya et al. (1971)
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Parent taxon: Arcioni according to J. G. Carter et al. 2011
See also Bouchet et al. 2010, Cope 1996 and Nevesskaja 2009
Sister taxon: Arcida
Subtaxa: Aegilops Cyrtodontidina Praecardiidina
Ecology: facultatively mobile epifaunal suspension feeder