†suborder Echinoina Claus 1876 (sea urchin)
Parent taxon: Echinoida according to S. Nisiyama 1966
Sister taxa: Spaniocyphus, Trochoechinus
Subtaxa: none
Ecology: slow-moving low-level epifaunal grazer
Distribution: there are no occurrences of Echinoina in the database