Parent taxon: Blastozoa according to S. L. Sheffield and C. D. Sumrall 2018
See also Barnes 1998, Guensburg and Sprinkle 2003 and Sepkoski 2002
Sister taxa: Asteroblastida, Blastoidea, Coronoidea, Diploporita, Eocrinoidea, Glyptosphaeritida, Lepidocystoidea, Parablastoidea, Paracrinoidea, Rhombifera, Rhombifera, Soluta, Sphaeronitida
Subtaxa: Abbreviatocrinites Acariaeocrinus Aethocrinea Angulata Asperocrinidae Aspidocrinus Balearocrinus Baryschyr Camerata Carpenterocrinus Communicrinus Cyclocaudex Cyclocharacidae Cyclocrista Cyclocyclicus Cyclomischidae Cycloscapus Dazhucrinus Dentiferocrinidae Dicyclica Dronovicrinus Dulanocrinus Dwortsowaecrinus Echmatocrinida Entrochus rotiformis Exaesiodiscidae Flexicrinus Floricyclidae Floripila Flucticharacidae Flucticharax Gasterometra Gemmacrinus Glyphidocrinus Hemistreptocrinoidea Heterostelechus Kojvicrinus Kstutocrinidae Lamprosterigma Leptocarphiidae Lichenocrinus Malovicrinus Mastocrinus Mooreanteris Moscovicrinus Multifidocrinus Ordinacrinus Pandocrinus Pentacrinoidea Pentagonocyclicus Pentagonopterix Pentaridica Picteticrinus Pinegicrinus Preptopremnum Protocrinoida Protocrinoidea Salairocrinidae Salairocrinus Schyschcatocrinidae Stenocrinidae Stukaliniidae Tantalocrinidae Taranshicrinidae Tatjanicrinus Tetragonocyclicus Tetralobocrinus Torrocrinus Waikaripites Webericrinus Zeravschanocrinus
Ecology: stationary upper-level epifaunal suspension feeder