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RE: FEATHERS FOR T-REX?
> From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of
> Jaime A. Headden
>
> Ornithomimosauria has, as far as I can tell, been defined as
> {*Ornithomimus* > *Troodon*}, by Holtz, in accordance with the
> Bullatosauria hypothesis. This gives the taxon a lesser subjective use
> than Arctometatarsalia in some hypotheses. Problematically, Sereno defined
> (1999) Ornithomimidae {*Ornithomimus* + *Pelecanimimus*}, ignoring
> Ornithomimosauria, and including Alvarezsauridae in his Ornithomimoidea
> {*Ornithomimus* + *Mononykus*}.
To add a third definition, Padian, Hutchinson & Holtz (1999) used the
version "all descendants of the most recent common ancestor of
_Ornithomimus_ and _Pelecanimimus_", making a node-based Ornithomimosauria
within the stem-based Arctometatarsalia.
Thomas R. Holtz, Jr.
Vertebrate Paleontologist
Department of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
College Park, MD 20742
http://www.geol.umd.edu/~tholtz/tholtz.htm
http://www.geol.umd.edu/~jmerck/eltsite
Phone: 301-405-4084 Email: tholtz@geol.umd.edu
Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-405-0796