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Re: PTEROSAURS AS AVIAN RELATIVES



Larger pterosaurs had pneumatic neck vertebrae similar to those of theropods.
Combined with long bone pneumatic complexes this suggests invasion by anterior
diverticula of the lungs. 

Pterosaur braincases were not inflated, their brain/body mass ratios were
largely in the reptilian range (see work by Jerison, Hopson, moi). The form of
their brain was somewhat avian. 

There is not a single researcher arguing the pterosaurs are close relatives of
birds, and it is possible the former were not even archosaurs. Most
similarities are clearly convergent. 

GP