Bolitogyrus pictus Smetana & Zheng (A–C), B. schillhammeri Brunke (D–F), B. rougemonti Brunke (G–I) and B. profundus Cai et al. (J–L). Aedeagus in parameral view (A, D, G, J), median lobe in lateral view (B, E, H, K), peg setae of paramere (C, F, I, L). Scale bars: 0.5 mm.