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RE: dinosaur beaks and ora speeds
> The skull of _Alioramus_ shows good evidence for a
> beak, at least
> according to the criteria used to judge whether a rhampotheca was
> present or
> not (see Darren's post). The same evidence can be marshaled in
> favor of a
> beaked _Carcharodontosaurus_ as well.
Well, I would add that in living beaked reptiles (turtles, birds), as well
as extinct forms generally accepted as beaked (ornithomimosaurs, for
instance) there is a relatively sharp edge between the lateral and ventral
surfaces of the maxillae. In contrast, in _Alioramus_ and _Carch._ there is
a curved surface grading the lateral into the ventral surface.
Thomas R. Holtz, Jr.
Department of Geology Director, Earth, Life & Time Program
University of Maryland College Park Scholars
College Park, MD 20742
Phone: 301-405-4084 Email: firstname.lastname@example.org
Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-405-0796