Subclass Regularia Latreille 1825 (sea urchin)
Parent taxon: Echinoidea according to G. M. Philip 1963
Sister taxa: Acrosalenioida, Archaeocidaridae, Bromidechinus, Cassiduloidea, Cidarites, Cidaroidea, Diplocidaroida, Disasteroida, Dysaster, Echinocrinus, Echinoida, Euechinoidea, Gnathostomata, Hemicidaroidea, Oligopygoida, Parechinus, Perischoechinoidea, Radiolus, Temnopleuroida
Subtaxa: Aulodonta
Ecology: epifaunal grazer-deposit feeder