| 释义 |
‖ furcula|ˈfɜːkjʊlə|
[L. furcula, dim. of furca fork.]
1. Ornith. A forked bone below the neck of a bird, consisting of the two clavicles and an inter-clavicle; the merry-thought or wish-bone.
1859Darwin Orig. Spec. i. (1878) 16 Relative size of the two arms of the furcula. 1868― Anim. & Pl. I. v. 175 The sternum, scapulæ, and furcula are all reduced in proportional length. 1903J. S. Kingsley tr. Hertwig's Man. Zool. 605 Clavicles and furcula are united directly or by ligaments to the broad sternum. 1954G. C. Kent Compar. Anat. Vertebrates viii. 253 The two clavicles unite in the midline to form a furcula (wishbone).
2. Embryol. A process from which the epiglottis is developed.
1887A. C. Haddon Introd. Study Embryol. vi. 183 Behind this [projection] are a pair of folds (furcula), which eventually will form the epiglottis. 1926Jordan & Kindred Textbk. Embryol. xv. 196 The crest of the furcula becomes elevated and develops into the epiglottis.
3. Ent. A forked appendage at the end of the abdomen in springtails.
[1871Amer. Naturalist V. 10 The spring consists of a pair of three-jointed appendages..forming a fork.] 1906J. W. Folsom Entomology ii. 68 Appendages... In Collembola..those of the fourth segment form the characteristic leaping organ, or furcula. 1909Jrnl. Econ. Bot. IV. 9 Furcula somewhat broader than in S[minthurus] aureus. 1932Borradaile & Potts Invertebrata xiv. 408 By contraction of the extensor muscles of the furcula the latter is pulled down out of contact with the hamula and the animal is propelled forwards into the air. 1964J. T. Salmon Index to Collembola I. 111 Re-examination showed this species to have a well developed furcula. |