†family Echinocystitidae Gregory 1897 (sea urchin)
Echinoidea - Echinocystitoida - Echinocystitidae
Parent taxon: Echinocystitoida according to P. M. Kier 1966
Sister taxa: Aptilechinus, Cavanechinus, Devonocidaris, Echinocyctitidae, Ledidocidaris, Lepidesthidae, Tornquistellus
Subtaxa: Echinocystites Praepholidocidaris Rhenechinus
Type: Echinocystites
Ecology: slow-moving low-level epifaunal detritivore
Distribution:
• Carboniferous of United States (1: Iowa collection)
• Devonian of Germany (1)
• Silurian of the United Kingdom (1)
Total: 3 collections each including a single occurrence