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terrestrial & semi-aquatic archosaurs



Is it now the most accepted view that the common ancestor of archosaurs was fully terrestrial, and that any semi-aquatic or aquatic archosaurs are secondarily so (i.e. reversals).
Or is it thought likely that the ancestor of archosaurs could have been semi-aquatic, and fully terrestrial forms evolved more than once. In particular, is there any evidence that any early Ornithodirans were semi-aquatic?
------Ken
P.S. Are aetosaurs regarded as fully terrestrial, or could their affinities for wet muddy habitats indicate a possible semi-aquatic life style?
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