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echinodermata n. 棘皮動物 棘皮動物 Echinodermata n 1: radially symmetrical marine invertebrates including e. g. starfish and sea urchins and sea cucumbers [ synonym: { Echinodermata}, { phylum Echinodermata}] Echinodermata \ E* chi` no* der" ma* ta\ ([- e]* k[ imac]` n[- o]* d[~ e] r" m[. a]* t[. a]), n. pl. [ NL., fr. Gr. ' echi^ nos hedgehog, sea urchin de` rma, - atos, skin.] ( Zo[" o] l.) One of the grand divisions of the animal kingdom. By many writers it was formerly included in the Radiata. [ Written also { Echinoderma}.] [ 1913 Webster] Note: The species usually have an exterior calcareous skeleton, or shell, made of many pieces, and often covered with spines, to which the name. They may be star- shaped, cylindrical, disk- shaped, or more or less spherical. The body consists of several similar parts ( spheromeres) repeated symmetrically around a central axis, at one end of which the mouth is situated. They generally have suckers for locomotion. The group includes the following classes: Crinoidea, Asterioidea, Ophiuroidea, Echinoidea, and Holothurioidea. See these words in the Vocabulary, and also { Ambulacrum}. [ 1913 Webster]
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