Early origin of viviparity and multiple reversions to oviparity in squamate reptiles.

@article{Pyron2014EarlyOO,
  title={Early origin of viviparity and multiple reversions to oviparity in squamate reptiles.},
  author={R Alexander Pyron and Frank T Burbrink},
  journal={Ecology letters},
  year={2014},
  volume={17 1},
  pages={13-21}
}
Viviparity has putatively evolved 115 times in squamates (lizards and snakes), out of only ~ 140 origins in vertebrates, and is apparently related to colder climates and other factors such as body size. Viviparity apparently evolves from oviparity via egg-retention, and such taxa may thus still have the machinery to produce thick-shelled eggs. Parity mode is also associated with variable diversification rates in some groups. We reconstruct ancestral parity modes accounting for state-dependent… CONTINUE READING
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