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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

“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, 

Best wishes,

Paul Heinrich