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Let's find the basal Ornithodire.



I thought we could all try to help the guys who want pterosaurs to stay in the 
Archosauria. 

To do so, all we have to do is come up with something close to the basal 
Ornithodire. Some taxon that might be close to the one that gave rise to 
Dinosauria, Pterosauria _and_ Scleromochlus. We can even imagine one that 
hasn't been discovered yet. What would it look like?

I'll throw one card on the table right now.

Cosesaurus. 

Why isn't Cosesaurus a good candidate? 

Is there a better candidate?

David Peters
St. Louis