basal plates

basal plates
1. (ECHINODERMATA: Crinoidea)
A cycle of 5 aboral calyx plates in primitive stalked crinoids; see radial plates.
The circular base of the cephalic framework, composed of an annular structure with posteriorly directed rim, the basal ring, and six radial elements.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • monocyclic — adj. [Gr. 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 …   Dictionary of invertebrate zoology

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