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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.
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