[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

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?
P.S. Are aetosaurs regarded as fully terrestrial, or could their affinities for wet muddy habitats indicate a possible semi-aquatic life style?
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.

Share information about yourself, create your own public profile at http://profiles.msn.com.