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Not all think pterosaurs are ornithodirans.  Dave Peters has 
considerable evidence on his _Pterosaur Homepage_ that has convinced me 
that pterosaurs are prolacertiforms.  See it at:


The evidence and characters ( about 30-40 ) all suggest that pterosaurs 
are prolacertiforms.  This is supported by,  but not limited to:

1)  Post cloacal bones
2)  Strut-like coracoid.
3)  Fiber supported membranes.  

Matt Troutman

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