Each duct extended highly coiled along the ipsilateral uterine tube until the lateral pole of the ovaries where it merged with the rete ovarii. A pair of well-differentiated Wolffian ducts with a central lumen originated ventrally at the vaginal opening into the vestibule and passed in a cranial direction through the ventral vaginal and uterine wall. ![]() The vestibule opened through a vertical vulvar cleft to the exterior. In the urethral and the lateral vestibular wall, glandular structures with characteristics of male prostate and bulbourethral glands, respectively, were found. The caudal portion of the vagina had two lumina, separated by a longitudinal septum and opening into two apertures into the vaginal vestibule, cranial to the urethral opening. The animals possessed a simple uterus, which was directly continuous with the vaginal canal. In adult female giant anteaters, ovoid ovaries with occasional seminiferous cord-like structures were observed. Histologically, the caudal section of this structure resembled the female vagina, the middle portion corresponded to the uterus, and the extensions showed characteristics of uterine tubes. The structure presented a total length of up to 10 cm and contained a yellowish liquid in its lumen. A tubular remnant of the partially fused Müllerian ducts extended from the seminal colliculus through the prostate gland, continued cranially in the genital fold, bifurcated, and attached with one elongation each to the left and right epididymal corpus. ![]() Male giant anteaters presented a short conical penis, intraabdominal testes, and prostate, vesicular and bulbourethral glands.
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