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Re: Scaly tyrannosaurs; fact or fiction?

On Mon, 1 Jan 2001 20:32:08   
 T. Mike Keesey wrote:
>On Mon, 1 Jan 2001, Steve  Brusatte wrote:
>> If there were, indeed, Tyrannosaur skin impressions found, then I
>> would be curious to see if they show any evidence of feathers.  Most
>> cladograms show Tyrannosaurus well within the range of feathers
>Not necessarily. Some cladograms do place them outside of
>Clade (_Sinosauropteryx_ + _Passeres_) (the known scope for feathery
>integument), and I think all place them outside of
>Clade (_Protarchaeopteryx_ + _Caudipteryx_ + _Beipiaosaurus_ + _Passeres_)
>(the known scope for feathers, probably). Phylogenetic bracketing
>is ambiguous on the case of tyrannosauroid integument, unless you follow a
>phylogeny where Tyrannosauroidea share more recent ancestry with Aves than
>_Sinosauropteryx_ does.

Actually, I should have said integument.  I, like many, have no real concrete 
idea where (exactly) on the phylogenetic tree actual feathers evolved, although 
we are getting a much clearer picture of that with all of these new 

Regardless, many cladograms (although not all as Mike pointed out) do put 
Tyrannosaurus in the clade where feathery integument is present.  At least 
until a really good specimen is preserved (not too likely in the Montana-South 
Dakota-Alberta region) we will probably not know for sure if such integument 
was present on Tyrannosaurus.


Steve Brusatte
Dino Land Paleontology

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