Fig. 3.

Secondary electron images of the fibrous inner structure of the arolium. (A) Overview of a rectangular cut into an arolium prepared by focused ion beam (FIB). (B) Fibrous structure in the proximal to distal orientation. The fibres are orientated in an angle of approximately 57 deg to the epicuticle. (C) Fibrous structure in the left to right orientation. The fibres are orientated perpendicular to the epicuticle. Bundles of fibres ramify into progressively finer fibres. The image was taken in an angle of 82 deg to the cutting edge. Scale bars: 10 μm (A), 5 μm (B), 10 μm (C).