dicyclic
From ZooTerms (Dictionary of Invertebrate Zoology)
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dicyclic (adjective; Greek dis, twice; kyklos, circle): (Echinodermata: Crinoidea) Calyx plates of primitive stalked crinoids that have an additional five infrabasal plates on the aboral side of the basal series found in the monocyclic condition; further plates may be present.
