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Fig. 7. TEM micrographs of the gula. (A) Detail of the epicuticle (epi). (B) Cross
section of the epi- and exocuticle. (C) Detail of the upper part of the
exocuticle (exo). (D) Detail of the deeper part of the exocuticle. a, c, d,
rectangles indicate parts of the sample magnified in A, B, and C,
respectively; black arrows indicate direction towards surface; white arrow
indicates the indentation depth. Abbreviations: pc, porous channels; sf,
surface.