| 释义 |
choano-|kəʊənəʊ|
combining form of Gr. χοάνη funnel, as in ˈchoanocyte, a ‘collar cell’ in sponges and choanoflagellates; hence ˌchoanoˈcytal a.; ˌchoanoˈflagellate a., belonging to the order Choanoflagellata of Infusoria (see quots.); also as n., a member of this order; ˈchoanosome, the inner part of a sponge, containing the choanocytes; hence ˌchoanoˈsomal a.
1887Choanosome [see ectosome s.v. ecto-]. 1888W. J. Sollas Tetractinellida p. xiv, The endoderm is partly composed of flagellated collared cells (choanocytes), and partly of pinacocytes. Ibid. p. xv, This investing skin may be distinguished as the ectosome, the rest of the sponge as the choanosome, the latter name framed in allusion to its being the region to which the choanocytes lining the flagellated chambers are restricted. Ibid. p. xxxviii, A contraction of the choanocytal wall. 1888Choanosomal [see ectosomal s.v. ecto-]. 1900E. A. Minchin in Lankester Treat. Zool. II. 27 Each cell bears at its upper free extremity a single vibratile flagellum.., which springs from the centre of an area enclosed by a delicate cup or collar of protoplasm. On account of the latter peculiarity these cells have been termed collar cells or choanocytes. Ibid. 53 Each collar cell resembles..a single choanoflagellate monad. 1906Cambr. Nat. Hist. I. 121 The Craspedomonadidae (often called Choanoflagellates). Ibid. 214 The distal ends of the choanosomal folds. 1927Haldane & Huxley Anim. Biol. xii. 264 The Choanoflagellates, a group of Flagellates in which a transparent collar of protoplasm surrounds the flagellum. 1959Chambers's Encycl. XIII. 101/2 The choanosome consists of a network of irregularly star-shaped cells, joined at their points, the interstices..being filled..with an intercellular jelly. Ibid. 102/1 The choanocytes, also known as whip-cells or collared cells, consist of a spherical or oval body, with the apex drawn out to form a protoplasmic collar from the base of which springs a long protoplasmic thread or whip. 1960L. Picken Organiz. Cells vi. vii. 241 It is possible that the condition of being attached is primitive, since it occurs in choanoflagellates, in the choanocytes of sponges [etc.]. |
