{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,29]],"date-time":"2026-09-29T19:23:24Z","timestamp":1790709804539,"version":"4.1.0"},"reference-count":83,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2017,9,15]],"date-time":"2017-09-15T00:00:00Z","timestamp":1505433600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"Programa de Fomento a la Investigaci\u00f3n","award":["UJAT-2012-C01-(UJAT)"],"award-info":[{"award-number":["UJAT-2012-C01-(UJAT)"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Morphology"],"published-print":{"date-parts":[[2017,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The structure of the ovary and oogenesis of<jats:italic>Poecilia mexicana<\/jats:italic>from an active sulfur spring cave is documented.<jats:italic>Poecilia mexicana<\/jats:italic>is the only poeciliid adapted to a subterranean environment with high hydrogen sulfide levels and extreme hypoxic conditions. Twenty females were captured throughout one year at Cueva del Azufre, located in the State of Tabasco in Southern Mexico. Ovaries were processed with histological techniques.<jats:italic>P. mexicana<\/jats:italic>has a single, ovoid ovary with ovigerous lamella that project to the ovarian lumen. The ovarian wall presents abundant loose connective tissue, numerous melanomacrophage centers and large blood vessels, possibly associated with hypoxic conditions. The germinal epithelium bordering the ovarian lumen contains somatic and germ cells forming cell nests projecting into the stroma.<jats:italic>P. mexicana<\/jats:italic>stores sperm in ovarian folds associated with follicles at different developmental phases. Oogenesis in<jats:italic>P. mexicana<\/jats:italic>consisted of the following stages: (i) oogonial proliferation, (ii) chromatin nucleolus, (iii) primary growth, subdivided into: (a) one nucleolus, (b) multiple nucleoli, (c) droplet oils\u2010cortical alveoli steps; (iv) secondary growth, subdivided in: (a) early secondary growth, (b) late secondary growth, and (c) full grown. Follicular atresia was present in all stages of follicular development; it was characterized by oocyte degeneration, where follicle cells hypertrophy and differentiate in phagocytes. The ovary and oogenesis are similar to these seen in other poeciliids, but we found frequent atretic follicles, melanomacrophage centers, reduced fecundity and increased of offspring size.<\/jats:p>","DOI":"10.1002\/jmor.20740","type":"journal-article","created":{"date-parts":[[2017,9,15]],"date-time":"2017-09-15T11:58:37Z","timestamp":1505476717000},"page":"1667-1681","source":"Crossref","is-referenced-by-count":16,"title":["Ovarian structure and oogenesis of the extremophile viviparous teleost<i>Poecilia mexicana<\/i>(<scp>P<\/scp>oeciliidae) from an active sulfur spring cave in<scp>S<\/scp>outhern<scp>M<\/scp>exico"],"prefix":"10.1002","volume":"278","author":[{"given":"Aar\u00f3n","family":"Torres\u2010Mart\u00ednez","sequence":"first","affiliation":[{"name":"Laboratorio de Acuicultura Tropical, Divisi\u00f3n Acad\u00e9mica de Ciencias Biol\u00f3gicas, Universidad Ju\u00e1rez Aut\u00f3noma de Tabasco, Villahermosa, Tab M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arlette","family":"Hern\u00e1ndez\u2010Franyutti","sequence":"additional","affiliation":[{"name":"Laboratorio de Acuicultura Tropical, Divisi\u00f3n Acad\u00e9mica de Ciencias Biol\u00f3gicas, Universidad Ju\u00e1rez Aut\u00f3noma de Tabasco, Villahermosa, Tab M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8819-0600","authenticated-orcid":false,"given":"Mari Carmen","family":"Uribe","sequence":"additional","affiliation":[{"name":"Laboratorio de Biolog\u00eda de la Reproducci\u00f3n Animal, Departamento de Biolog\u00eda Comparada, Facultad de Ciencias, Universidad Nacional Aut\u00f3noma de M\u00e9xico, Ciudad de M\u00e9xico M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8072-2182","authenticated-orcid":false,"given":"Wilfrido Miguel","family":"Contreras\u2010S\u00e1nchez","sequence":"additional","affiliation":[{"name":"Laboratorio de Acuicultura Tropical, Divisi\u00f3n Acad\u00e9mica de Ciencias Biol\u00f3gicas, Universidad Ju\u00e1rez Aut\u00f3noma de Tabasco, Villahermosa, Tab M\u00e9xico"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2017,9,15]]},"reference":[{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.10325"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365-2761.2003.00485.x"},{"key":"e_1_2_6_4_1","unstructured":"AILAD. 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