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Here, we describe the anatomy and histology of the male genital system of <jats:italic>Ameiva ameiva<\/jats:italic> 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.<\/jats:p>","DOI":"10.1002\/ar.25463","type":"journal-article","created":{"date-parts":[[2024,4,26]],"date-time":"2024-04-26T02:29:24Z","timestamp":1714098564000},"page":"3596-3605","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Male genital system of <i>Ameiva ameiva<\/i> (<scp>Squamata: Teiidae<\/scp>)"],"prefix":"10.1002","volume":"307","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7331-0590","authenticated-orcid":false,"given":"\u00c9rica da Silva","family":"Maciel","sequence":"first","affiliation":[{"name":"Departamento de Biologia Universidade Estadual Paulista\u2014IBILCE\/UNESP  S\u00e3o Paulo Brazil"},{"name":"Laborat\u00f3rio de Ecologia e Evolu\u00e7\u00e3o Instituto Butantan  S\u00e3o Paulo Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0945-7037","authenticated-orcid":false,"given":"Rodrigo","family":"Zieri","sequence":"additional","affiliation":[{"name":"Departamento de Biologia, Instituto Federal de Educa\u00e7\u00e3o Ci\u00eancia e Tecnologia de S\u00e3o Paulo\u2014IFSP  S\u00e3o Paulo Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3928-1183","authenticated-orcid":false,"given":"Selma Maria","family":"de Almeida\u2010Santos","sequence":"additional","affiliation":[{"name":"Departamento de Biologia Universidade Estadual Paulista\u2014IBILCE\/UNESP  S\u00e3o Paulo Brazil"},{"name":"Laborat\u00f3rio de Ecologia e Evolu\u00e7\u00e3o Instituto Butantan  S\u00e3o Paulo Brazil"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,4,25]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1463-6395.2006.00231.x"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1463-6395.2007.00278.x"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.1052250303"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.10369"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1201\/b10879-12"},{"issue":"1","key":"e_1_2_8_7_1","first-page":"54","article-title":"Epididymis of the lizard Eutropis carinata: A light microscopic and ultrastructural seasonal study","volume":"27","author":"Aranha I.","year":"2023","journal-title":"Journal of Endocrinology and Reproduction"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1590\/S1676-06032011000300003"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1017\/S1431927621012046"},{"key":"e_1_2_8_10_1","volume-title":"Guia brasileiro de boas pr\u00e1ticas a eutan\u00e1sia em animais","author":"CFMV","year":"2012"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00360-013-0776-x"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1097\u20104687(199708)233:2<99::AID\u2010JMOR1>3.0.CO;2\u2010J"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1078\/0065-1281-00731"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1590\/S1519-69842009000200028"},{"key":"e_1_2_8_15_1","unstructured":"Gautreaux J. 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