Parent taxon: Cladida according to W.I. Ausich et al. 1998
See also Frest and Strimple 1982, Kammer and Roeser 2012, Moore and Jeffords 1968, Parsley 1981 and Ubaghs et al. 1978
Sister taxa: Aaglacrinus, Aethocrinidae, Aithriocrinus, Ampelocrinida, Apektocrinidae, Bicidiocrinus, Briseocrinus, Cathetocrinus, Cromyocrinacea, Cyathocrinacea, Dimerocrinites anticostiensis, Eucladida, Flexibilia, Harmostocrinus, Idaeumocrinus, Kanabinocrinus, Kansacrinus, Kooptoonocrinus, Lanecrinus, Lekocrinus, Mathericrinus, Menniscocrinus, Nacocrinus, Nuxocrinus, Parascytalocrinus, Perittocrinus, Porocrinoidea, Poteriocrinitina, Pskovicrinus, Pulaskicrinus, Pyrenocrinus, Rimosidocrinus, Saccosompsis, Sardinocrinus, Scammatocrinus, Treocrinus, Wetherbyocrinus, Worthenocrinus
Subtaxa: Agassizocrinacea Decadocrinacea Kophinocrinus Lophocrinacea Manicrinidae Scytalocrinacea Zeacrinitacea
Ecology: stationary intermediate-level epifaunal suspension feeder