Subclass Heterodonta Neumayr 1884 (clam)
Parent taxon: Heteroconchia according to R. Bieler and P. M. Mikkelsen 2006
See also Ameghino 1889, Bouchet et al. 2010, Cope 1997, Giribet and Wheeler 2002, Gliozzi and Malatesta 1983, Newell 1965, Pérez et al. 2013, Rosenberg et al. 2006, Shoshani et al. 1989, Squires 1984, Squires 1987, Vokes 1980, Ward and Blackwelder 1987 and Wingard 1993
Sister taxa: Archiheterodonta, Cardiomorphi, Eoastartella, Heterodonta, Lipanellidae, Palaeoheterodonta, Parenia, Paullia, Uniomorphi
Subtaxa: Anomalodesmata Carditoidea Myoida Rhaetidiidae Septibranchia
Ecology: facultatively mobile infaunal suspension feeder