Crinoidea - Dendrocrinida - Pirasocrinidae

Full reference: R. C. Moore and H. L. Strimple. 1973. Lower Pennsylvanian (Morrowan) crinoids from Arkansas, Oklahoma, and Texas. University of Kansas Paleontological Contributions, Echinodermata Article 60(12):1-84

Belongs to Affinocrinus according to R. C. Moore and H. L. Strimple 1973

Sister taxa: Affinocrinus grandis, Affinocrinus normalis

Type specimen: SUI 33295 (dorsal cup). Its type locality is East bank of Grand River abandoned quarry (Loc. 16), which is in a Morrowan marine limestone/shale in the Bloyd Formation of Oklahoma.

Ecology: stationary intermediate-level epifaunal suspension feeder

Average measurements (in mm): dorsal cup 3.80 x 10.60