{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T15:11:49Z","timestamp":1772118709438,"version":"3.50.1"},"reference-count":67,"publisher":"Wiley","issue":"10","license":[{"start":{"date-parts":[[2024,10,10]],"date-time":"2024-10-10T00:00:00Z","timestamp":1728518400000},"content-version":"vor","delay-in-days":9,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal of Morphology"],"published-print":{"date-parts":[[2024,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Extraembryonic membranes provide protection, oxygen, water, and nutrients to developing embryos, and their study generates information on the origin of the terrestrial egg and the evolution of viviparity. In this research, the morphology of the extraembryonic membranes and the types of placentation in the viviparous snake\n                    <jats:italic>Conopsis lineata<\/jats:italic>\n                    are described through optical microscopy during early and late gestation. When embryos develop inside the uterus, they become surrounded by a thin eggshell membrane. In early gestation, during stages 16 and 18, the embryo is already surrounded by the amnion and the chorion, and in a small region by the chorioallantois, which is product of the contact between the chorion and the growing allantois. A trilaminar omphalopleure covers the yolk sac from the embryonic hemisphere to the level of the equator where the\n                    <jats:italic>sinus terminalis<\/jats:italic>\n                    is located, and from there a bilaminar omphalopleure extends into the abembryonic hemisphere. Thus, according to the relationship of these membranes with the uterine wall, the chorioplacenta, the choriovitelline placenta, and the chorioallantoic placenta are structured at the embryonic pole, while the omphaloplacenta is formed at the abembryonic pole. During late gestation (stages 35, 36, and 37), the uterus and allantois are highly vascularized. The allantois occupies most of the extraembryonic coelom and at the abembryonic pole, it contacts the omphaloplacenta and form the omphalallantoic placenta. This is the first description of all known placenta types in Squamata for a snake species member of the subfamily Colubrinae; where an eggshell membrane with 2.9\u2009\u03bcm in width present throughout development is also evident. The structure of extraembryonic membranes in\n                    <jats:italic>C. lineata<\/jats:italic>\n                    is similar to that of other oviparous and viviparous squamate species. The above indicates not only homology, but also that the functional characteristics have been maintained throughout the evolution of the reproductive type.\n                  <\/jats:p>","DOI":"10.1002\/jmor.21783","type":"journal-article","created":{"date-parts":[[2024,10,11]],"date-time":"2024-10-11T01:16:00Z","timestamp":1728609360000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Extraembryonic Membranes and Placentation in the Mexican Snake\n                    <i>Conopsis lineata<\/i>"],"prefix":"10.1002","volume":"285","author":[{"given":"Cecilia","family":"de Dios\u2010Arcos","sequence":"first","affiliation":[{"name":"Laboratorio de Biolog\u00eda Tisular y Reproductora, Departamento de Biolog\u00eda Comparada, Facultad de Ciencias Universidad Nacional Aut\u00f3noma de M\u00e9xico M\u00e9xico City M\u00e9xico"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3538-8709","authenticated-orcid":false,"given":"Maricela","family":"Villagr\u00e1n\u2010SantaCruz","sequence":"additional","affiliation":[{"name":"Laboratorio de Biolog\u00eda Tisular y Reproductora, Departamento de Biolog\u00eda Comparada, Facultad de Ciencias Universidad Nacional Aut\u00f3noma de M\u00e9xico M\u00e9xico City M\u00e9xico"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,10,10]]},"reference":[{"key":"e_1_2_9_2_1","volume-title":"T\u00e9cnicas histol\u00f3gicas y citoqu\u00edmicas","author":"Aguilar M. 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