All dinosaurs are diapsid reptiles with an upright stance, and by definition Dinosauria consists of the groups Saurischia and Ornithischia, which excludes Pterosauria.So, Pterosauria aren't dinosaurs because "dinosaur" doesn't include them. And I'm guessing they aren't included because they aren't really dinosaurs, post hoc.
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posted by l33tpolicywonk at 10:45 AM on June 24, 2010