Type material and no. of specimens examined with different methods in the presented study.

Abbreviations: α-tub, α-tubulin immunostaining (IS); CLSM, confocal laser scanning microscopy; FMRF, FMRF-amid-like IS; GLU, 2–3% glutaraldehyde; Hist, histological semithin sections examined in LM; KW, Katrine Worsaae; LM, light microcopy; PFA, 2–3% paraformaldehyde; phal, phalloidin; SEM, scanning electron microscopy; ser, serotonin IS; TEM, transmission electron microcopy; tyr-tub, tyrosinated tubulin IS; TB, toluidin blue staining of semithin sections on slide; UA+LC, uranyl-acetate+lead citrate staining of ultrathin sections on grid; WM, permanent whole mount (sealed, glycerol); WS, Wolfgang Sterrer.