Clade Uniomorphi Gray 1854 (clam)
Parent taxon: Heteroconchia according to J. G. Carter et al. 2011
Sister taxa: Archiheterodonta, Cardiomorphi, Eoastartella, Heterodonta, Heterodonta, Lipanellidae, Palaeoheterodonta, Parenia, Paullia
Subtaxa: Thoraliidae Unioni
Ecology: facultatively mobile infaunal suspension feeder