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Re: Eoraptor question
At 08:41 PM 11/18/98 -0800, Larry Dunn wrote:
>Why is _Eoraptor_ supposedly closer to the basal saurischian than,
Because, under the Sereno model, _Herrerasaurus_ shares several derived
features with neotheropods that _Eoraptor_ lacks. In other words,
_Eoraptor_ is less divergent in form from the ancestral condition.
>Is that in fact the most common opinion of the
>placement of E.?
I do not know of anyone who considers _Herrerasaurus_ less derived
anatomically from an ancestral position than _Eoraptor_.
However, here are the two extremes of the phylogenetic position of _E._ and
Sereno et al.:
So, in this case, _Eoraptor_ diverged from other theropods first, and
In the most extremly different of several trees from Holtz & Padian (1995)
(incidentally, the updated analyses do not support this as a most
In this case, _Herrerasaurus_ is closer to the basal saurischian condition,
because it is closer to Dinosauria than is _Eoraptor_.
There hasn't been much work on _Eoraptor_'s phylogenetic position yet,
beyond the studies of Sereno, Novas, and colleagues (mine and Padian's
remains unpublished, but I'm working on it!!!).
Thomas R. Holtz, Jr.
Vertebrate Paleontologist Webpage: http://www.geol.umd.edu
Dept. of Geology Email:firstname.lastname@example.org
University of Maryland Phone:301-405-4084
College Park, MD 20742 Fax: 301-314-9661