†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

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Ecology: stationary intermediate-level epifaunal suspension feeder

Distribution:

• Carboniferous of United States (15: Arkansas, Oklahoma collections)

Total: 15 collections including 17 occurrences

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