| 释义 |
‖ pereion, peræon Zool.|pəˈraɪən, pəˈriːən|
[A factitious term intended to represent Gr. περαιόων, περαιῶν, pr. pple. of περαιοῦν ‘to carry across, transport’, erron. taken as ‘to walk about’. Later users of the term have more exactly transliterated the reputed Gr. source as peræon.]
A name for the thorax in Crustacea, as bearing the ambulatory limbs. Cf. pleon. Hence peˈreiopod, (also peˈræopod, pereiˈo-, peræˈopodite), one of the ambulatory limbs attached to the pereion.
1855C. Spence Bate in Rep. Brit. Assoc. (1856) 27 Thoracic segments, (Pereion, from περαιόω to walk about: pereion, part which supports the walking legs. This and the following [pleon] are suggested instead of the old and incorrect synonyms of thorax, abdomen, &c.). Ibid. 35 The pereiopoda, or walking feet.—This includes the five posterior thoracic feet of authors. 1877W. Thomson Voy. Challenger I. ii. 131 At the base of the first segment of the pereion. 1877Encycl. Brit. VI. 635/2 In the adult Mysis, eight pairs of limbs (that is to say the five pairs of pereiopodites or ‘walking-feet’, and the three pairs of maxillipeds or ‘jaw⁓feet’) are all furnished with two branches. 1893Stebbing Crustacea iv. 44 The trunk..is often called the peræon, intended to signify the ambulatory part. Ibid. 45 The possession of chelæ is not confined to the first pair of so-called peræopods. 1932J. S. Huxley Probl. Relative Growth iii. 87 Those pereiopods which are used as walking legs..have a definite but slight growth-gradient. 1964Oceanogr. & Marine Biol. II. 467 In these displays, serving a threat function, the crab stands higher on its pereiopods. 1970Nature 16 May 661/2 The pereiopods of M[erguia] rhizophorae are more robust than in most marine shrimps. |