†family Echinocyctitidae Gregory 1897 (sea urchin)
Echinoidea - Echinocystitoida - Echinocyctitidae
Parent taxon: Echinocystitoida according to P. M. Kier 1966
Sister taxa: Aptilechinus, Cavanechinus, Devonocidaris, Echinocystitidae, Ledidocidaris, Lepidesthidae, Tornquistellus
Subtaxa: none
Ecology: slow-moving low-level epifaunal detritivore
Distribution: there are no occurrences of Echinocyctitidae in the database