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RE: had a thought - dimorphic tyrannosaurs? was RE New fossils provide clues to tyrannosaur/ornithomimid evolution
Thomas R. Holtz, Jr. <firstname.lastname@example.org> wrote:
> However, there is now a very good history for both the ornithomimosaurs
> (going back to the Early Cretaceous) and the tyrannosauroids (back to
> the Middle Jurassic), and they are separate and distinct
> throughout that time.
It's interesting how these new basal tyrannosauroids pull previously
non-tyrannosauroid taxa into the clade, as other basal tyrannosauroids. This
time, _Proceratosaurus_ comes out as a basal tyrannosauroid (Makovicky et al.,
2009). In one previous analysis it was _Coelurus_ and _Tanycolagreus_ that
were recovered as basal tyrannosauroids. (Makovicky et al.  are close:
these two come out in a sister taxon to the Tyrannosauroidea +
Maniraptoriformes clade, which I guess would be Tyrannoraptora).
Also, this same analysis recovers _Falcarius_ outside the Therizinosauroidea,
in a much more basal position relative to other maniraptorans. Even though the
bootstrap support would seem to be weak (based on the cladogram), I find this
position VERY interesting.