| 释义 |
exocuticle|ˈɛksəʊkjuːtɪk(ə)l|
Also exocuˈticula.
[f. exo- + cuticle.]
The middle layer of a cuticle. a. The hard, chitinous outer part of the procuticle of an insect or other arthropod.
1929[see endocuticle a]. 1951A. G. Richards Integument of Arthropods xvi. 149 In calcified cuticles, at least of decapod crustacea, the exocuticle and outer portion of the endocuticle become calcified. 1967P. A. Meglitsch Invert. Zool. xvi. 676 Beneath it [sc. the epicuticle] is the procuticle, made up of two layers, an outer exocuticle, often pigmented and impregnated with the substances found in the epicuticle, and an inner endocuticle. It is the exocuticle that is thickened to form the skeletal plates or sclerites.
b. The middle part of the cuticle that surrounds animal fibres or hairs, etc.
1949[see epicuticle b]. 1962W. J. Onions Wool ii. 16 The exocuticle, which constitutes about half of the scale, is a protein resistant to digestion by trypsin. |