exocuticle noun the layer of an insect’s cuticle between the epicuticle and the endocuticle, which is often hard and dark in colour Liberaldictionary.com
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Diagrammatic section through the arthropod integument.
The Epicuticle
Insect cuticle is initially laid down as one material, called the procuticle, and subsequently becomes differentiated into exocuticle and endocuticle,
First, you have the epicuticle, which is the very top part of the exoskeleton (shown as a thick black line on the top of the diagram).