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Comulatida (feather stars; 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.