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Re: Coeluridae as a Wastebasket for Coelurosaurs

In a message dated 5/30/01 2:37:56 PM EST, david.marjanovic@gmx.at writes:

<< I still can't -- how can the air sac system evolve twice? >>

Why not? You can fill the ocean with what we don't know about the anatomy of 
theropod and pterosaur air sac systems.