| 单词 | polyclad |
| 释义 | polyclad, a. and n. Zool.|ˈpɒlɪklæd|
[ad. mod.L. name of suborder Polycladidea (A. Lang 1884, in Fauna und Flora des Golfes von Neapel XI. 1), f. poly- + Gr. κλάδος branch.]
a. adj. Belonging to the division Polycladida of turbellarian worms, having a main intestine with more than four branches.
b. n. A worm of this division. (Distinguished from triclad.).
1888Rolleston & Jackson Anim. Life 578 A more or less apparent radial symmetry is observable in some Polyclad Turbellaria. Ibid. 672 Two curious Polyclads have..been described with certain Ctenophore-like characters. 1896F. W. Gamble in Cambr. Nat. Hist. II. i. 16 The Polyclads were so called by Lang on account of the numerous primary branches of their intestine. They are free-living, purely marine Platyhelminthes. 1918Proc. Nat. Acad. Sci. IV. 381 Muscular creeping operations are probably general among polyclads. 1941J. Steinbeck Sea of Cortez xi. 111 Beautiful purple polyclad worms crawled over lawns of purple tunicates. 1975Nature 28 Aug. 737/1 Polyclads have limited powers of regeneration. Ibid. 11 Dec. 518/1 We..found them [sc. reddish-brown streaks in the sea] to consist of high densities of the dinoflagellate Noctiluca and of a polyclad turbellarian. |
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