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Uricotelism



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?