Figure 2.

Cuticle surfaces of sawfly larvae by SEM and related integument sections by LM. Non-easy bleeder is S. multifasciata (a, e). Easy bleeders are P. aterrima (b, f), A. padi (c, g), R. nodicornis (d) and R. bensoni (h). Views by SEM (a to d) show blister-like swellings (a) or spider-like microstructures (b to d). Views by LM (e to h) showing that, above a cellular layer, the cuticle comprises a procuticle, in blue, whereas the epicuticle, in red (e, g), is not observed in some species (f, h).