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Echinodermal :: Echinodermal (a.) Relating or belonging to the echinoderms.

Asterias :: Asterias (n.) A genus of echinoderms.

Fission :: Fission (n.) A process by which certain coral polyps, echinoderms, annelids, etc., spontaneously subdivide, each individual thus forming two or more new ones. See Strobilation..

Echinodermata :: Echinodermata (n. pl.) One of the grand divisions of the animal kingdom. By many writers it was formerly included in the Radiata.

Perisome :: Perisome (n.) The entire covering of an invertebrate animal, as echinoderm or coelenterate; the integument..

Echinozoa :: Echinozoa (n. pl.) The Echinodermata.

Madreporite :: Madreporite (n.) The madreporic plate of echinoderms.

Zoophyta :: Zoophyta (n. pl.) An extensive artificial and heterogeneous group of animals, formerly adopted by many zoologists. It included the c/lenterates, echinoderms, sponges, Bryozoa, Protozoa, etc..

Holothurioidea :: Holothurioidea (n. pl.) One of the classes of echinoderms.

Ambulacral :: Ambulacral (a.) Of or pertaining to ambulacra; avenuelike; as, the ambulacral ossicles, plates, spines, and suckers of echinoderms..

Asteridea :: Asteridea (n. pl.) A class of Echinodermata including the true starfishes. The rays vary in number and always have ambulacral grooves below. The body is star-shaped or pentagonal.

Echinodermatous :: Echinodermatous (a.) Relating to Echinodermata; echinodermal.

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..

Trivium :: Trivium (n.) The three anterior ambulacra of echinoderms, collectively..

Bivium :: Bivium (n.) One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra..

Umbo :: Umbo (n.) A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larvae of echinoderms or in the tympanic membrane of the ear..

Echinoderm :: Echinoderm (n.) One of the Echinodermata.

Echinoidea :: Echinoidea (n. pl.) The class Echinodermata which includes the sea urchins. They have a calcareous, usually more or less spheroidal or disk-shaped, composed of many united plates, and covered with movable spines. See Spatangoid, Clypeastroid..

Sea Urchin :: Sea urchin () Any one of numerous species of echinoderms of the order Echinoidea.

Echinus :: Echinus (n.) A genus of echinoderms, including the common edible sea urchin of Europe..

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