Evolution of Viviparity in Squamata: Evolutive Scenarios and the Rarity of Intermediate Stages
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https://doi.org/10.11606/issn.1984-5154.v1p21-26Keywords:
Evolution of viviparity, Squamata, developmental stagesAbstract
Viviparity in Squamata is derived from oviparity and had more than 100 independent origins within the group. One of the hypothesis that better explain the oviparity-viviparity transition is related to thermic requirements of developing embryos. Gas exchange and humidity of the incubation substrate, however, are also fundamental factors for survival during intermediate developmental stages. These last factors, on the other hand, can be responsible for the rarity of intermediate stages of development on eggs recently laid, since a trade-off between the extension of the period of uterine retention and the eggshell thickness is identified.Downloads
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