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Re: Archosaur Origins...was:MESENOSAURUS ERRATA.

In a message dated 8/24/01 12:31:01 PM, Dinogeorge@aol.com writes:

<< Perhaps earlier than Triassic: Permian is not outside the realm of 
possibility, and indeed, the Permian glaciation and generally cool climate 
may have fostered the evolution of endothermy and an insulatory integument in 
some of the earliest prolacertiforms. >>

Permian? I don't think so. There were NO archosaurs until just before the 
P/Tr boundry, and we know that insulatory integuments didn't evolve until 
later, as we know from skin impressions. [Walking on Eggs has some nice 
photos of baby suropod skin]

eric l.