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Precocial young Re: Yabeinosaurus, earliest viviparous squamate





On Sun, 17 Jul 2011, bh480@scn.org wrote:
New online article:

Yuan Wang and Susan E. Evans (2011)
A gravid lizard from the Cretaceous of China and the early history of
squamate viviparity.
Naturwissenschaften (advance online publication)
DOI: 10.1007/s00114-011-0820-1
http://www.springerlink.com/content/egq3t760854q0146/


Although viviparity is most often associated with mammals, roughly one
fifth of extant squamate reptiles give birth to live young. Phylogenetic
analyses indicate that the trait evolved more than 100 times within
Squamata, a frequency greater than that of all other vertebrate clades

How much parental care is there with these live birth reptiles?

Does this mean parental care evolved with live birth, or would the young
have been first been precocial, and parental care evolving later?