| 释义 |
gnathobase Zool.|ˈneɪθəʊbeɪs|
[f. gnatho- + base n.1]
A process developed from the lower part of a segmented limb in certain arthropods, modified to bite or crush food. Hence gnathoˈbasic a.
1881E. R. Lankester in Q. Jrnl. Micr. Sci. Apr. 348 Of the six endites the proximal is somewhat isolated and pushed towards the middle line... It is a jaw process, and may be spoken of as the ‘gnathobase’. 1902― in Encycl. Brit. XXV. 695/1 The five pairs of appendages of the post-oral somites of the head or prosoma thus constituted all primitively carry gnathobasic projections on their coxal joints, which act as hemignaths; in the more specialized forms the mandibular gnathobases cease to develop. 1904W. T. Calman in Ann. & Mag. Nat. Hist. Feb. 155 The double series of epipodial lamellæ, the segmentation of the thoracic limbs, the double gnathobasic lobes of the first pair. 1932Borradaile & Potts Invertebrata x. 274 Some of the evidence suggests an archetype [arthropod] with a nine-segmented axis bearing on the median side of the first segment a biting process (gnathobase). 1964New Scientist 13 Aug. 365/2 The mandibles themselves may either derive from the basal part of a segmented limb (the gnathobase) or from a whole jointed limb. |