Crinoidea - Dendrocrinida - Cromyocrinidae

Parent taxon: Cromyocrinidae according to N. G. Lane 1964

Sister taxa: Aglaocrinus, Dicromyocrinus, Goleocrinus, Metacromyocrinus, Minilyacrinus, Moapacrinus, Paracromyocrinus, Parethelocrinus, Parulocrinus, Ulocrinus

Subtaxa: Synarmocrinus brachiatus, Synarmocrinus depressus, Synarmocrinus iatani

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Type: Synarmocrinus brachiatus

Ecology: stationary intermediate-level epifaunal suspension feeder