Diagrammmatic representaiton of the cuticle of Hadrurus arizonensis: endo, enducuticle, consisting of several lamellae separated by membranes; epi, epicuticle (comprising c, cuticulin layer; dh, dense homogeneous layer; oe, outer epicuticle; om, outer membrane); exo, exocuticle (comprising he, hyaline exocuticle; ie, inner exocuticle; me, mesocuticle). Relative thicknesses are approximately to scale, except that the epidermis is disproportionately enlarged.