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Siamotyrannus and early tyrannosaurids
Dinogeorge writes (quoting a UPI newswire):
> The discoverers, led by Eric Buffetaut of the Centre National de la
> Recherche Scientifique in Paris, are defending their find as the
> oldest and most primitive known tyrannosaurid, ancestral to all the
> later ones.
I wondered about this. Aren't there at least two tyrannosaurs of
equal or older age than _Siamotyrannus_?
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).
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).