monocyclic
From ZooTerms (Dictionary of Invertebrate Zoology)
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monocyclic (adjective; Greek monos, one; kyklos, circle): (Echinodermata: Crinoidea) Refers to calyx plates of primitive stalked crinoids having an aboral cycle of 5 plates (basal) and 5 plates (radial) oral to the basal plates.
