Abstract：
Understanding squamate reproductive morphology is crucial for investigating ecological, behavioral, and evolutionary questions. Here, we describe the anatomy and histology of the male genital system of Ameiva ameiva from southeastern Brazil. Ten adult males were dissected to characterize genital macroscopy and collect fragments of the testes, gonadoducts, and kidneys for histological examination. We examined 10 transverse histological sections per individual and measured the epithelial height of the epididymis and ductus deferens. The male reproductive system consists of a pair of yellowish oval testes, the rete testis, ductuli efferentes, epididymis, ductus deferens, ampulla ductus deferentis, sexual segment of the kidney (SSK), cloaca, and hemipenis. The hemipenis is elongated, cylindrical, and unilobed, with a sulcate face and an asulcate face, which has continuous fringes throughout its length. Seminiferous tubules exhibited germ cells at various stages. The epididymis is wider and more coiled than the ductus deferens. The rete testis has a simple squamous epithelium with long stereocilia, while the narrower ductuli efferentes are lined by a simple ciliated cuboidal epithelium. The epididymal epithelium is pseudostratified columnar, with basal and ciliated principal cells, whereas the ductus deferens epithelium is pseudostratified to simple cuboidal. The epididymal epithelium is 1.5 times taller than the ductus deferens epithelium. Here, we observed the SSK present in the cortex of the ventral region of the kidneys due to the hypertrophy of the distal convoluted tubules, as well as its secretory activity. Our findings will contribute to future research into the evolution of squamate reproductive morphology.
摘要：
了解鳞状生殖形态对于研究生态学至关重要，行为，和进化问题。这里,我们描述了巴西东南部Ameivaameiva男性生殖系统的解剖学和组织学。对十名成年男性进行了解剖，以表征生殖器宏观检查并收集睾丸碎片，促性腺激素,和肾脏做组织学检查.我们检查了每个人10个横向组织学切片，并测量了附睾和输精管的上皮高度。男性生殖系统由一对淡黄色的椭圆形睾丸组成，rete睾丸,导管传出，附睾,输精管,壶腹导管输精炎,肾脏的性段（SSK），cloaca,和半阴茎。半阴茎被拉长了，圆柱形,和单身，有一张平静的脸和一张平静的脸，它在整个长度上都有连续的条纹。生精小管在各个阶段都表现出生殖细胞。附睾比输精管更宽，更卷曲。网状睾丸有一个简单的鳞状上皮，长立体纤毛，而较窄的导管出流由简单的纤毛立方上皮排列。附睾上皮为假复层柱状，基底和纤毛主细胞，而输精管上皮被假分层为简单的立方体。附睾上皮比输精管上皮高1.5倍。这里,我们观察到由于远曲小管肥大而存在于肾脏腹侧皮质的SSK，以及它的分泌活动。我们的发现将有助于进一步研究鳞茎生殖形态的演变。
