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Re: Pre-archosaur...was : What came before Eoraptor?



-----Original Message-----
From: NJPharris@aol.com <NJPharris@aol.com>
To: dinosaur@usc.edu <dinosaur@usc.edu>
Date: Monday, April 10, 2000 12:31 PM
Subject: Re: Pre-archosaur...was : What came before Eoraptor?


>
>Between basal dinosaurs and any prolacertilian-like ancestors are the
>Crurotarsi (including the large, quadrupedal rauisuchians, phytosaurs,
>aetosaurs, and crocodilians), the Proterosuchia (quadrupedal and
sprawling),
>and *Euparkeria*.  Thus, basal archosaurians were likely fairly large and
>quadrupedal, and it is difficult to see how any direct transition from a
>prolacertilian-like body form to a theropodan one could have taken place.
>
>--Nick P.
>

Many of the prolacertilians seem all but "quadrupedal and sprawling".
Certainly not Cosesaurus see: http://home.stlnet.com/~azero/Cosesaurus.html
Many were quite small: Megalancosaurus preonensis 14", Drepanosaurus
unguicaudatus 16", Tanytrachelos ahynis 12", Prolacerta broomi
22",Jesairosaurus lehmani 8", Boreopricea 12", Cosesaurus....8". All
mentioned seem capable of bipedality.