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Re: Pre-archosaur...was : What came before Eoraptor?
In a message dated 4/7/2000 8:53:17 AM Pacific Daylight Time,
> Could Euparkeria be evolved from prolacertilians? (otherwise,....where did
> come from?) Are dinosaurs considered derived from something else,....(not
> discovered)? I`d just like to know what the general opinion is on this
> aspect of archosaur evolution.
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.