†family Discinidae Gray 1840 (lamp shell)
Parent taxon: Discinoidea according to A. Williams et al. 2000
Sister taxon: Trematidae
Subtaxa: Acrosaccus, Discina, Discinisca, Discinolepis, Discradisca, Heliomedusa, Kosoidea, Lindstroemella, Lingulodiscina, Lochkothele, Oehlertella, Orbiculoidea, Orbiculoideinae, Roemerella, Schizotreta
Type: Discina
Ecology: stationary low-level epifaunal suspension feeder