Figure 1 in The male genital tract and aedeagal components of the Diptera with a discussion of their phylogenetic significance

Figure 1. Male internal reproductive organs (dorsal view). A, Panorpa (Mecoptera), left testis removed [modified from Grell (1942)]. B, Nannochorista (Mecoptera), left testis removed, shaded areas mark discoloured regions (scale bar = 0.1 mm). C, Spilopsyllus (Siphonaptera), with ventral surface of accessory gland on right [modified from Mead-Briggs (1962)]. D, Xenos (Strepsiptera) [modified from Carcupino et al. (1995)]. acc gl, accessory gland; acc gl app, accessory gland appendix; ej dt, ejaculatory duct; epid, epididymis; p ej dt, proximal ejaculatory duct; sem ves, seminal vesicle; tes, testis; vas df, vas deferens.