Clade Septibranchia Pelseneer 1888 (clam)
Parent taxon: Heterodonta according to R. Bieler and P. M. Mikkelsen 2006
See also Bouchet et al. 2010, Coan et al. 2000, Hickman 2014, Nevesskaja 2009 and Ward and Blackwelder 1987
Sister taxa: Anomalodesmata, Carditoidea, Myoida
Subtaxa: Cuspidarioida Verticordioida
Ecology: facultatively mobile infaunal suspension feeder