†family Atopocrinidae Warn and Strimple 1977 (Sea lily)
Crinoidea - Homocrinida - Atopocrinidae
Parent taxon: Homocrinida according to W. I. Ausich 1998
Sister taxa: Anomalocrinidae, Cincinnaticrinidae, Columbicrinidae, Homocrinidae, Ramacrinidae
Subtaxa: Othneiocrinus
Ecology: stationary intermediate-level epifaunal suspension feeder
Distribution: found only at J-18 (Ordovician of Utah)