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; class Crinoidea, subclass Articulata)

An order of crinoids which lack a stem or column in the adult state and which swim freely. The uppermost ossicle of the column is modified into a conical or discoidal plate (a centrodorsal). This bears numerous cirri (see cirrus), which are used to grasp substrata. The order has existed since the Jurassic.

Subjects: Zoology and Animal Sciences.

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