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Trochite :: Trochite (n.) A wheel-like joint of the stem of a fossil crinoid.

Articulus :: Articulus (n.) A joint of the cirri of the Crinoidea; a joint or segment of an arthropod appendage.

Pinnule :: Pinnule (n.) Any one of a series of small, slender organs, or parts, when arranged in rows so as to have a plumelike appearance; as, a pinnule of a gorgonia; the pinnules of a crinoid..

Crinoid :: Crinoid (n.) One of the Crinoidea.

Cystidea :: Cystidea (n. pl.) An order of Crinoidea, mostly fossils of the Paleozoic rocks. They were usually roundish or egg-shaped, and often unsymmetrical; some were sessile, others had short stems..

Scapula :: Scapula (n.) One of the plates from which the arms of a crinoid arise.

Pentacrinoid :: Pentacrinoid (n.) An immature comatula when it is still attached by a stem, and thus resembles a Pentacrinus..

Pentacrinus :: Pentacrinus (n.) A genus of large, stalked crinoids, of which several species occur in deep water among the West Indies and elsewhere..

Comatulid :: Comatulid (n.) Any crinoid of the genus Antedon or allied genera.

Syzygy :: Syzygy (n.) Any one of the segments of an arm of a crinoid composed of two joints so closely united that the line of union is obliterated on the outer, though visible on the inner, side..

Rhachis :: Rhachis (n.) The central cord in the stem of a crinoid.

Myzostomata :: Myzostomata (n. pl.) An order of curious parasitic worms found on crinoids. The body is short and disklike, with four pairs of suckers and five pairs of hook-bearing parapodia on the under side..

Marsupite :: Marsupite (n.) A fossil crinoid of the genus Marsupites, resembling a purse in form..

Encrinite :: Encrinite (n.) A fossil crinoid, esp. one belonging to, or resembling, the genus Encrinus. Sometimes used in a general sense for any crinoid..

Comatula :: Comatula (n.) A crinoid of the genus Antedon and related genera. When young they are fixed by a stem. When adult they become detached and cling to seaweeds, etc., by their dorsal cirri; -- called also feather stars..

Crinoidea :: Crinoidea (n. pl.) A large class of Echinodermata, including numerous extinct families and genera, but comparatively few living ones. Most of the fossil species, like some that are recent, were attached by a jointed stem. See Blastoidea, Cystoidea, Comatula..

Radiale :: Radiale (n.) Radial plates in the calyx of a crinoid.

Paleocrinoidea :: Paleocrinoidea (n. pl.) A suborder of Crinoidea found chiefly in the Paleozoic rocks.

Crinoidal :: Crinoidal (a.) Of pertaining to crinoids; consisting of, or containing, crinoids..

Pentremites :: Pentremites (n.) A genus of crinoids belonging to the Blastoidea. They have five petal-like ambulacra.

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