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Re: Uricotelism



> Patrick Mellor wrote:
> 
> How could Postosuchus have sprayed mammal like urine, when all living
> archosaurs (and most diapsids) are uricotelic? Also, I have a question
> that I think is interesting: If living synapsids (mammals) are not
> uricotelic but evolved from basal ammniotes along with diapsids, why
> would they have ever lost something as advantageous in terms of water
> retention as uricotelism?

Perhaps the earliest small mammal-like animals were semi-aquatic? Maybe
the Platypus is the mother of us all! :)

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Dann Pigdon                   Australian Dinosaurs:
GIS Archaeologist           http://dannsdinosaurs.terrashare.com
Melbourne, Australia        http://www.alphalink.com.au/~dannj/
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