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Oldest Known Amniote Embryos
The below paper above describes the oldest known
amniote embryos.
Pineiro, G., J. Ferigolo, M. Meneghel, and M. Laurin, 2012,
The oldest known amniotic embryos suggest viviparity
in mesosaurs. Historucal Biology. Available online
March 7, 2012, DOI: 10.1080/08912963.2012.662230
http://www.tandfonline.com/doi/abs/10.1080/08912963.2012.662230#preview
“Our finds represent the only known documentation
of amniotic embryos in the Paleozoic and the earliest
known case of viviparity, thus extending the record
of these reproductive strategies by 90 and 60 Ma,
respectively.”
Best wishes,
Paul Heinrich