Re: Bistahieversor sealeyi, NM tyrannosaurid

[Tim Williams <tijawi@yahoo.com>]

T. Michael Keesey <keesey@gmail.com> wrote:


> I'm also not about to start pronouncing the "P" in "Pterosauria", 


The "P" is silent, just like a child in a swimming pool.  (Sorry, old joke...)


Anyway, as for the _Bistahieversor_ paper itself, the authors mention "cf. 
_Alectrosaurus_".  I'm guessing this includes the referred skull and 
postcranial material described by Perle in 1977, from the Bayn Shireh Formation 
of Mongolia.  The holotype of _Alectrosaurus_ is a partial hindlimb from the 
Iren Dabasu Formation of China.  So the only overlapping material are hindlimb 
elements - and I know the referral of the Bayn Shireh material to 
_Alectrosaurus_ is somewhat precarious.  Further study might find the Bayn 
Shireh tyrannosauroid to be a new taxon.


Also, Carr et al. (2010) might be the first published phylogenetic analysis to 
recover _Iliosuchus_ as a tyrannosauroid.  _Iliosuchus_ is roughly coeval with 
_Proceratosaurus_ (both Bathonian), regarded as the earliest known 
tyrannosauroid.  I also notice _Bagaraatan_ comes up as a tyrannosauroid as 
well.


Cheers

Tim