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

Pyron, R. Alexander, Burbrink, Frank T.·2014·Ecology Letters

Abstract

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 diversification in a large‐scale phylogenetic analysis, and find strong support for an early origin of viviparity at the base of Squamata, and a complex pattern of subsequent transitions. Viviparous lineages have higher rates of speciation and extinction, and greater species turnover through time. Viviparity is associated with lower environmental and body temperatures in lizards and amphisbaenians, but not female mass. These results suggest that parity mode is a labile trait that shifts frequently in response to ecological conditions.

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Metadata

Authors
Pyron, R. A., & Burbrink, F. T.
Venue
Ecology Letters
Publisher
Wiley
Published
2013-08-19
Volume
17
Issue
1
Pages
13-21
ISSN
  • 1461-023X (ISSN-L)
  • 1461-0248
OpenAlex
W2122887852
Cited by
313
References
37
FWCI
21.43
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Early origin of viviparity and multiple reversions to oviparity in squamate reptiles. https://app.cochat.ai/papers/10.1111/ele.12168
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Pyron, R. A., & Burbrink, F. T. (2014). Early origin of viviparity and multiple reversions to oviparity in squamate reptiles. Ecology Letters. https://doi.org/10.1111/ele.12168

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