Parent taxon: Echinodermata according to A. B. Smith and C.R.C. Paul 1982

Sister taxa: Arkarua, Asterozoa, Blastoidea, Blastozoa, Camptostromoidea, Coronata, Crinoidea, Ctenocystoidea, Ctenoimbricata, Cystoidea, Diploporita, Discoidea, Echinoconus, Echinozoa, Edrioasteroidea, Eleutherozoa, Graciacystis, Helicoplacoidea, Holothuroidea, Homoiostelea, Homostelea, Iheringiana, Macrocystellidae, Parablastoidea, Paracrinoidea, Pediculacaudinidae, Pelmatozoa, Peripneustes, Rhombifera, Scoteinocystis, Scutellidae, Scutellinidae, Semperitidae, Stylophora, Tubocaudinidae

Subtaxa: Apycnodiscidae, Cyclocystoididae

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Ecology: stationary low-level epifaunal