Crinoidea - Disparida - Alphacrinidae
Full reference: T. E. Guensburg. 2010. Alphacrinus New Genus and Origin of the Disparid Clade. Journal of Paleontology 84(6):1209-1216
Parent taxon: Disparida according to T. E. Guensburg 2010
Sister taxa: Allagecrinacea, Allagecrinoidea, Anomalocrinacea, Athenacrinidae, Aureocrinus, Belemnocrinoidea, Brutopisocrinus, Calceocrinacea, Calceocrinida, Changninocrinus, Cincinnaticrinacea, Claviculacrinus, Dulkumocrinidae, Eustenocrinida, Gongrocrinus, Heterocrinacea, Heterocrinidae, Heterocrinoidea, Homocrinacea, Homocrinida, Macnamaratylus, Maennilicrinida, Metabolocrinus, Myelodactylacea, Myelodactylida, Paradoxocrinidae, Pentameri, Perittocrinacea, Perritocrinus, Pisocrinacea, Pisocrinida, Pisocrinoidea, Regnellicrinus, Resetocrinus, Tetragonocrinida, Tornatilicrinidae, Xisoallogecrinus
Subtaxa: Alphacrinus
Ecology: stationary intermediate-level epifaunal suspension feeder
Distribution: found only at Summit of Skull Rock Pass (Ordovician of Utah)