†family Arkacrinidae Knapp 1969 (Sea lily)
Crinoidea - Dendrocrinida - Arkacrinidae
Parent taxon: Erisocrinacea according to R. C. Moore and H. L. Strimple 1973
Sister taxa: Catacrinidae, Cricocrinus, Erisocrinidae, Paradelocrinidae, Protencrinidae
Subtaxa: Arkacrinus
Ecology: stationary intermediate-level epifaunal suspension feeder
Distribution: