†suborder Arbacioina Gregory 1900 (sea urchin)
Parent taxon: Arbacioida according to S. Nisiyama 1966
Sister taxa: Acropeltidae, Arbaciidae, Dialithocidaris, Glypticidae, Goniopygidae, Pygmaeocidaris, Salenioina, Tetrapygus
Subtaxa: none
Ecology: slow-moving low-level epifaunal grazer
Distribution: there are no occurrences of Arbacioina in the database