| 释义 |
‖ pseudopodium Biol.|ps-, sjuːdəʊˈpəʊdɪəm|
Pl. -ia.
[mod.L., f. Gr. ψευδο- pseudo- + -podium, ad. Gr. πόδιον, dim. of πούς, ποδ- foot.]
1. Zool.
a. In certain Protozoa (esp. Rhizopoda), Each of a number of processes temporarily formed by protrusion of any part of the protoplasm of the body, and serving for locomotion, prehension, or ingestion of food. Also, a similar formation in an amœboid cell, as a leucocyte. Also fig.
1854J. Hogg Microsc. ii. ii. (1861) 265 Finger-like processes, called pseudopodia, which it appears to have the power of shooting out from any part of its substance. 1875Huxley & Martin Elem. Biol. (1877) 18 Each pseudopodium is evidently, at first, an extension of the denser clear substance (ectosarc) only. 1901G. N. Calkins Protozoa 17 note, The term ‘pseudopodia’ was given by von Siebold to replace Dujardin's more descriptive phrase ‘changeable processes’ (expansions variables). a1902S. Butler Note-bks. (1912) xii. 196 My reviewers felt no sense of need to understand me... When the time comes that they want to do so they will throw out a little mental pseudopodium without much difficulty.
b. The tapering caudal extremity or ‘foot’ of a Rotifer, serving for swimming, attachment, etc.
1898Sedgwick Textbk. Zool. I. viii. 299 The posterior end of the body tapers, and is called the foot or pseudopodium;..the joints are often telescopically retractile.
2. Bot. A false pedicel or foot-stalk; applied to certain elongations of the stem in mosses, as those supporting the gemmæ in Aulacomnion, or the sporogonium in Sphagnum.
1861H. Macmillan Footnotes fr. Page Nat. 32 Several species of mosses are furnished with gemmæ or pseudopodia, which consist of powdery or granulated heads terminating an elongated and almost leafless portion of the stem. 1876J. H. Balfour in Encycl. Brit. IV. 161/2 In Sphagnum, the sporogonium is fully developed within the epigonal leaves, and when complete the axis beneath it elongates, forming the pseudopodium. |