FIGURE 3 in The genital and anal papillae of Compsura heterura (Characidae: Cheirodontinae): morphological structure and possible role in insemination

FIGURE 3 | SEM photomicrographs (A, C, E) and photos under stereomicroscope (B, F) of the genital and anal papillae in ventral view (anterior to left), and (D) histology of the genital and anal papillae of Compsura heterura females. A. Juvenile female measuring 17.6 mm SL. B. Virgin adult female measuring 26.56 mm SL showing the hood-like genital papilla and anal papilla. C. Genital papilla of a specimen measuring 26.56 mm SL, in ventral view, showing the separation between the genital and urinary openings. D. Genital papilla of a specimen measuring 27.24 mm SL showing the separation between the genital and urinary openings. E. Genital papilla of a specimen measuring 27.02 mm SL euthanized immediately after copulation showing the anal and genital papilla close to each other, forming a closed cavity covering the genital opening. F. Genital papilla of a specimen measuring 26.87 mm SL euthanized during spawning. AN = anus; AP = anal papilla; GO = genital opening; GP = genital papilla; OV = ovary; UD = urinary duct; UO = urinary opening.