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RE: Arctometatarsalia

> From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of
> T. Mike Keesey
> They'd only be equivalent if _Sinosauropteryx_ were an arctometatarsalian
> -- something I've never seen proposed. I guess they're close, tho'.
Actually, some of the trees in my paper in the Ostrom Symposium find that
position, for what it is worth.

> From: owner-dinosaur@usc.edu [mailto:owner-dinosaur@usc.edu]On Behalf Of
> Jaime A. Headden
>  Thus only reinforces the problematic usage of
> apomorphy-based taxa and reasoning (a name that sounds like a feature
> should be defined on this feature). I would refuse to use Gauthier and de
> Queiroz' definition on the sole grounds of _their_ application of priority
> of definition (1992) being tied to Carinatae {*Ichthyornis* + Neornithes};
> hence, by application, Arctometatarsalia {*Ornithomimus* > Neornithes},
> not Arctometatarsalia {arctometatarsus in *Ornithomimus* where an
> arctometatarsus is thus...}.


                Thomas R. Holtz, Jr.
                Vertebrate Paleontologist
Department of Geology           Director, Earth, Life & Time Program
University of Maryland          College Park Scholars
                College Park, MD  20742
Phone:  301-405-4084    Email:  tholtz@geol.umd.edu
Fax (Geol):  301-314-9661       Fax (CPS-ELT): 301-405-0796