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annelida n. 環節動物 環節動物 Annelida n 1: segmented worms: earthworms; lugworms; leeches [synonym: {Annelida}, {phylum Annelida}] Annelida \An*nel"i*da\, n. pl. [NL. See {Annelid}.] (Zool.)
A division of the Articulata, having the body formed of numerous rings or annular segments, and without jointed legs. The principal subdivisions are the {Ch[ae]topoda}, including the {Oligoch[ae]ta} or earthworms and {Polych[ae]ta} or marine worms; and the {Hirudinea} or leeches. See {Ch[ae]topoda}. [1913 Webster] Annulata \An`nu*la"ta\, n. pl. [Neut. pl., fr. L. annulatus ringed.] (Zool.) A class of articulate animals, nearly equivalent to {Annelida}, including the marine annelids, earthworms, Gephyrea, Gymnotoma, leeches, etc. See {Annelida}. [1913 Webster]
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