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RE: weird jurassic dinobird with very weird feathers
Jaime Headden wrote:
> We actually only have one therizinosaur with a decent tail, and it seems to
> be a basal taxon. We assume
> reduction was occuring with a reasonable certainty, but after
> *Beipiaosaurus*, graviportality seems to
> have coincided with elevation of the dorsum and MASSIVE pneumatization of the
> vertebrae, which helps
> posteriorize the center of gravity back in front of the hips (but this is in
> the bulkier, bigger taxa).
>shortening and elevation of the dorsum coincide also with shortening of the
>dorsals and incorporation of
> the dorsals into the elevated cervicals, as in *Nanshiungosaurus*.
Yep, well said. It's amazing how therizinosaurs converge on sauropods in so
> oviraptorosaurs, which have also undergone a distal shortening of the tail,
> production of a pygostyle,
> and so forth.
Yes - any ideas why oviraptorosaurs did this? They don't seem to have had an
avian-style locomotory style, with the femur held near-horizontally (not even
_Caudipteryx_), so the truncation of the oviraptorosaur tail is odd.
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