Cylindroiulus villumi sp. n. SEM of the male gonopod. A mesal view B lateral view C denticles on the anterior flagellum-conducting lamella of the solenomerite D pro- and mesomerite, anterior view E pro- and mesomerite, posterior view F opisthomerite, posterior view. Abbreviations: f: flagellum, fl: flagelliferous lobe of promerite, fp: finger-shapped projection of promerite, m: mesomerite, p: promerite, pc: lateral rim of paracoxite, pfl: posterior flagellum-conducting lamella, pp: paracoxal process, s: solenomerite, sc: sperm canal. Scale bars: 10 μm (A, B, D, E, F); 1 μm (C).