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

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

Periproct :: Periproct (n.) The region surrounding the anus, particularly of echinoderms..

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

Stelleridan :: Stellerida (n. pl.) An extensive group of echinoderms, comprising the starfishes and ophiurans..

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.

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

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

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

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

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..

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.

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..

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

Ophiuroidea :: Ophiuroidea (n. pl.) A class of star-shaped echinoderms having a disklike body, with slender, articulated arms, which are not grooved beneath and are often very fragile; -- called also Ophiuroida and Ophiuridea. See Illust. under Brittle star..

Ossicle :: Ossicle (n.) One of numerous small calcareous structures forming the skeleton of certain echinoderms, as the starfishes..

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..

Annuloida :: Annuloida (n. pl.) A division of the Articulata, including the annelids and allied groups; sometimes made to include also the helminths and echinoderms..

Starfish :: Starfish (n.) Any one of numerous species of echinoderms belonging to the class Asterioidea, in which the body is star-shaped and usually has five rays, though the number of rays varies from five to forty or more. The rays are often long, but are sometimes so short as to appear only as angles to the disklike body. Called also sea star, five-finger, and stellerid..

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