An examination of the variation in maternal placentae across the genus Poeciliopsis (Poeciliidae)

@article{Kwan2015AnEO,
  title={An examination of the variation in maternal placentae across the genus Poeciliopsis (Poeciliidae)},
  author={Lucia Kwan and Megan E. Fris and F. Helen Rodd and Locke Rowe and Laura Tuhela and Tami M Panhuis},
  journal={Journal of Morphology},
  year={2015},
  volume={276}
}
Placentae show considerable diversity in a number of nonmammalian, viviparous organisms, including amphibians, reptilian sauropsids, teleost fish, and chondrichthyes. However, the evolutionary processes driving the evolution of placenta are still debated. In teleost fishes, the genus Poeciliopsis (Poeciliidae) offers a rare opportunity for studying placental evolution: extensive placentation has evolved three independent times within the last 750,000 years and there is substantial interspecific… 

An examination of surface epithelium structures of the embryo across the genus Poeciliopsis (Poeciliidae)

Despite the differences in the surface epithelium of embryos across Poeciliopsis species and embryonic developmental stages, this variation was not associated with the level of postfertilization maternal nutrient provisioning.

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The evolution of matrotrophy (post-fertilization maternal provisioning to developing embryos) has been explained through several hypotheses. Trexler and DeAngelis proposed in 2003 a theoretical model

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Morphological basis for maternal nutrient provision to embryos in the viviparous fish Ataeniobius toweri (Teleostei: Goodeidae)

In viviparous Mexican fishes of the family Goodeidae, embryos develop in the maternal ovarian lumen. They typically absorb maternal nutrients during gestation by means of “trophotaeniae,” that is,

The genome of the live-bearing fish Heterandria formosa implicates a role of conserved vertebrate genes in the evolution of placental fish

The results show that a substantial portion of positively selected genes have a function that correlates well with the morphological changes that form the placenta of H. formosa, compared to the corresponding tissue in non-placental poeciliids.

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