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dinosaur synapomorphies

Hi all,
I would like to see a discussion of some of the synapomorphies that unite dinosaurs, and would especially like to know which are regarded as the strongest synapomorphies (least likely to be convergent).
To get the ball rolling, what about the "three or more sacral vertebrae" synapomorphy. Could this not have easily occurred once in saurischians and once in ornithischians??
Is it not true that Staurikosaurus has only 2 sacral vertebrae, and could this not be a primitive state rather than a reversal (3 sacrals back to 2)? Are there other primitive dinosaurs that have only 2 sacral vertebrae??
Thanks, Ken Kinman
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