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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
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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