Crinoidea - Cyathocrinida - Euspirocrinidae

Alternative spelling: Illemnocrinus

Full reference: J. D. Eckert. 1987. Illemocrinus amphiatus, a new cladid inadunate crinoid from the Middle Ordovician of Ontario. Canadian Journal of Earth Science 24:860-865

Parent taxon: Euspirocrinidae according to W. I. Ausich 1998

Sister taxa: Anaglyptocrinus, Manocrinus, Necopinocrinus

Subtaxa: none