Bolitogyrus hainanensis Cai et al. (A–D), B. loculus Cai et al. (E–H), B. solodovnikovi Brunke (I–K) and B. feai Brunke (L–O). Aedeagus in parameral view (A, E), apex of median lobe in parameral view (B, F, I, L), median lobe in lateral view (C, G, J, M), peg setae of paramere (D, H, K, O). Figures 16A, B, D, E, F, H modified from Cai et al. (2015). Scale bars: 0.5 mm.