Full reference: F. M'Coy. 1844. A synopsis of the characters of the Carboniferous limestone fossils of Ireland 1-207
Parent taxon: Echinoidea according to A. Kroh and A. B. Smith 2010
See also Begg and Ballard 1991, Boczarowski 2001, Fell 1966 and Webster et al. 2009
Sister taxa: Acrosalenioida, Bromidechinus, Cassiduloidea, Centrechinoida, Cidaris aculeata, Cidaris aialensis, Cidaris alpina, Cidaris alternata, Cidaris austriaca, Cidaris avena, Cidaris biconica, Cidaris biformis, Cidaris braunii, Cidaris buchii, Cidaris caudex, Cidaris cingulata, Cidaris coralliophila, Cidaris costalarensis, Cidaris costata, Cidaris costeanensis, Cidaris decorata, Cidaris decoratissima, Cidaris dorsata, Cidaris ecki, Cidaris forminensis, Cidaris fustis, Cidaris glabra, Cidaris hausmanni, Cidaris lanceata, Cidaris linearis, Cidaris milierensis, Cidaris ovata, Cidaris perplexa, Cidaris petersii, Cidaris plana, Cidaris pyramidalis, Cidaris quadrialata, Cidaris quadriserrata, Cidaris regnyi, Cidaris remifera, Cidaris remifera, Cidaris reticulata, Cidaris schwageri, Cidaris scrobiculata, Cidaris seelandica, Cidaris semicostata, Cidaris similis, Cidaris spinachristi, Cidaris spongiosa, Cidaris stipes, Cidaris stoppanii, Cidaris sulcata, Cidaris tenuicostata, Cidaris tetraedrica, Cidaris trapezoidalis, Cidaris trigona, Cidaris triserrata, Cidaris undulatus, Cidaris valparolae, Cidaris verticillata, Cidaris verticillata, Cidaris waechteri, Cidaris wissmanni, Cidaris zardini, Cidaroidea, Corystusidae, Dallonia, Diplocidaroida, Disasteroida, Echinoida, Echinopluteus, Euechinoidea, Exocycloida, Exocycloidea, Gajechinus, Gnathostomata, Hemicidaris gracilis, Hemicidaris obliquelineata, Oligopygoida, Ombria, Parechinus, Perischoechinoidea, Plegiocidaris senex, Pleurechinus, Proterocidaridae, Protocidaris, Radiolus, Radiolus adametzi, Radiolus alutensis, Radiolus antipai, Radiolus boletus, Radiolus complanatus, Radiolus culter, Radiolus festuca, Radiolus fusus, Radiolus herbichi, Radiolus lineola, Radiolus penna, Radiolus racadaui, Radiolus raiblianus, Radiolus rostratus, Radiolus segmentatus, Regularia, Strechoritina, Temnopleuroida, Uvanogelia, Vernius, Yunnanechinus
Subtaxa: Archaeocidaris Eocidaris Lepidocidaris Nortonechinus Polytaxicidaris Silurocidaris Xenocidaris
Type: Archaeocidaris
Ecology: epifaunal grazer-deposit feeder
Distribution:
• Triassic of United States (2: Alaska collections)
• Permian of Australia (3), Bosnia and Herzegovina (2), Laos (2), New Zealand (1), Peru (3), Tunisia (2), United States (26: Arizona, Nevada, Texas)
• Carboniferous of Canada (2: Alberta), China (1), Ireland (2), Poland (1), the United Kingdom (13), United States (37: Arizona, Arkansas, Colorado, Illinois, Indiana, Kentucky, Montana, New Mexico, Oklahoma, Texas, Utah, Virginia, Wyoming)
• Devonian of the Czech Republic (1), France (1), Germany (9), Poland (1)
• Silurian of Sweden (1)
Total: 110 collections including 121 occurrences