part of
cuticle
exocuticle
BTO:0001602
BrendaTissueOBO
The outer layer of the procuticle of certain crustaceans and arthropods, which contains cuticulin, chitin, and phenolic substances that are oxidized to produce the dark pigment of the cuticle; The hard and usually darkened layer of the cuticle lying between the endocuticle and epicuticle.