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Re: Siamotyrannus and early tyrannosaurids
Tim Williams wrote:
>Aren't there at least two tyrannosaurs of equal or older age than
>I heard of a braincase from the Dinosaur National Monument of Utah
>(i.e. Late Jurassic) that supposedly comes from a small tyrannosaur.
>The last I heard of this braincase is that it had been provisionally
>referred to _Stokesosaurus_ (which was regarded as a tyrannosaurid by
>Jim Madsen back in the 1970's).
The braincase refered to Stokesosaurus DOES look like a primitive
tyrannosaurid, and is even closer to Itemirus (which may be a basal
tyrannosauroid, but may be closer to dromaeosaurids).
>There's also a small, headless tyrannosaurid from the Early
>Cretaceous of Mongolia. (I only know of this one through
>Dinogeorge.) _Tonouchisaurus_ is it's name (_still a nomen nudum_
>as far as I know).
This is a ~1 m long, two-fingered creature from the Gobi. Presumably, like
many other Mongolian Early K dinosaurs, it is Aptian-Albian (and thus,
younger than Siamotyrannus).
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
"There are some who call me... Tim."