Fig 3. Urticating setae of type I and its subtypes I_a, I_b, I_c, I_d, I_e and I_f.

Cross sections (CS) 1–4: arrangement of barbs in cross-sections. The arrows show two rows of opposite reversed denticles on the apical end of section C1. Abbreviations: B = basal section; C1 = central section with well-developed reversed barbs (corresponds with “main barbs” according to Cooke et al. [6]); C2 = central section, which is bare or with two parallel longitudinal rows of short confluent reversed barbs or denticles; A = apical section.