†order Temnopleuroidea Mortensen 1942 (sea urchin)
Parent taxon: Echinacea according to I. D. Lindley 2001
Sister taxa: Arbacioida, Besairiecidaris, Bramus, Camarodonta, Crinocidaris, Glyphopneustidae, Plesiocidaroida, Stirodonta, Stomopneustoida
Subtaxa: none
Ecology: epifaunal grazer-deposit feeder
Distribution: found only at CH/f505 - Tumaio Limestone, Chatham Islands (Eocene of New Zealand)