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Re: [dinosaur] Jehol Biota rise and fall + protoceratopsids from Alxa, Inner Mongolia, China + more free pdfs



It seems certain schools are still using the ancient use of
Thecodontia. How has this not passed into the recesses of history,
yet?

On Tue, Oct 24, 2017 at 5:10 PM, Tim Williams <tijawi@gmail.com> wrote:
> Brad McFeeters <archosauromorph2@hotmail.com> wrote:
>
>> Shao et al. 2017 strangely refer to _Liaoningornis_ as "the only member of
>> the Neornithes in the Yixian Formation." Has anyone else ever considered it
>> to be that derived?
>
>
> My guess is that the authors have confused 'Neornithes' with
> 'Ornithurae'.  _Liaoningornis_ was originally described as a member of
> the Ornithurae (Hou, 1997; Chinese Science Bulletin 42: 413-417),
> where it was described as a "carinate bird" on account of its keeled
> sternum.  However, it was assigned to a new order
> (Liaoningornithiformes) at the base of the Ornithurae, not the crown
> clade.
>
> Since then, _Liaoningornis_ has been redescribed and referred to the
> Enantiornithes (O'Connor 2012; Vertebrata Palasiatica 50: 25-37).
>
> This review (Shao et al. 2017) contains a few dodgy statements.
> There's also this: "After the Yale conference, many feathered
> dinosaurs such as _Beipiaosaurus_, _Sinornithosaurus_, _Microraptor_,
> _Sinovenator_, provided new evidences for the "Thecodontia-origin" of
> birds..."  Elsewhere, the review makes it clear that birds are
> descended from dinosaurs, so this statement is odd.



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Jaime A. Headden
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"Innocent, unbiased observation is a myth" - P. B. Medawar (1969)