Figure 4 from: Yang X, Liu W, Ahrens D, Bai M (2011) A key to species of the genus Gastroserica Brenske of the China (Coleoptera, Scarabaeidae, Sericini), with the description of two new species and two new records for China. ZooKeys 139: 23-44. https://doi.org/10.3897/zookeys.139.1702

Figure 4 - A–C Gastroserica angustula Brenske, 1897 D–F Gastroserica nikodymi Ahrens, 2000 G–I Gastroserica bilyi Ahrens, 2000 J–L Gastroserica guangdongensis Ahrens, 2000 M–O Gastroserica guizhouana Ahrens, 2000 P Gastroserica bicolor Nijima & Kinoshita, 1923. A, D, G, J, M aedeagus, left side lateral view B, E, H, K, N, P paramere, dorsal view C, F, I, L, O aedeagus, right side lateral view. Scale bar=1mm. (A–O from Ahrens 2000, and P from Nomura 1974)