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REZENDE, L. C. Biology of reproduction in armadillo: morphology of the female reproductive tract of the species of Euphractus sexcinctus and comparative morphological analysis of placental in species of the Chaetophractus villosus, Chaetophractus vellerosus, and Euphractus sexcinctus. [Biologia da reprodução em tatus: análise morfológica do aparelho reprodutor feminino da espécie Euphractus sexcinctus e análise morfológica placentária comparativa entre as espécies Chaetophractus villosus, Chaetophractus vellerosus e Euphractus sexcinctus]. 2011. 141 f. Tese (Doutorado em Ciências) – Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, 2011. The literature maintains that Xenarthra and isolated with its long existence may be the light to understand the evolution of placental mammals. The armadillo Euphractus sexcinctus is endemic in South America and has been poorly search. The morphology and the relationship between hard and soft tissues of the female genital, pelvis and perineum of nine adult animals has been described using techniques: mesoscopy, microscopy (electron and light) and computed tomography. The anatomical design of the pelvis and perineum of the Euphractus sexcinctus presented baseline characteristics, being an excellent study model to understand the development of tetrapods. The perineal region contained the trines (anal and urogenital) and pubic area exhibited the external genital with clitoral pronounced by the absence of labia, with different mammalian recent cliteropenis presenting feature similar to that of crocodiles, this enables interesting questions about the importance of maintenance of such protruding genitalia. The bones of the pelvis in the adult animal had cast up, constituting the sinsacrum. Regarding the internal genital tract, the extensive length of the cervix in relation to the uterus called the attention, probably because the bulk of the pelvis minor has been filled by coccygeal muscles. Than this muscles pushed the uterus to the pelvis higher. The ovaries, oviducts and vagina resembled recent mammalian organs, so there appeared no evolutionary novelties. The placenta in animal studies (Chaetophractus villosus, Chaetophractus vellerosus and Euphractus sexcinctus) were classified as highly invasive and hemochorial, differing between species in the layout of the chorionic villi in contact with the uterus.

Biologia da reprodução em tatus: análise morfológica do aparelho reprodutor feminino da espécie Euphractus sexcinctus e análise morfológica placentária comparativa entre as espécies Chaetophractus villosus, Chaetophractus vellerosus e Euphractus sexcinctus