†family Monotidae Fischer 1887 (clam)
Parent taxon: Monotoidei according to J. G. Carter et al. 2011
Sister taxa: Buchioidea, Eurydesmatoidea, Oxytomoidea
Subtaxa: Eomonotis, Monotinae, Monotis, Otapiria, Otapiriinae, Praeotapiria
Ecology: stationary epifaunal suspension feeder