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RE: Pygostyle-like structure from Beipiaosaurus

To: twilliams_alpha@hotmail.com, dinosaur@usc.edu
Subject: RE: Pygostyle-like structure from Beipiaosaurus
From: Ronald Orenstein <ornstn@rogers.com>
Date: Mon, 13 Oct 2003 14:15:11 -0400
In-reply-to: <BAY2-F84pC9goDtAwy000009cb9@hotmail.com>
Reply-to: ornstn@rogers.com
Sender: owner-dinosaur@usc.edu

At 10:51 AM 13/10/03 -0500, Tim Williams wrote:

For example, truncation and coossification of the caudal vertebrae occurred because small maniraptorans no longer needed a long counterbalancing tail.

I can see that as an explanation for loss of tail length - but why go to the trouble of developing an entirely new structure? Why not just reduce what is there (as happened in humans, for example)?

-- Ronald I. Orenstein Phone: (905) 820-7886 International Wildlife Coalition Fax/Modem: (905) 569-0116 1825 Shady Creek Court Mississauga, Ontario, Canada L5L 3W2 mailto:ornstn@rogers.com

References:
- RE: Pygostyle-like structure from Beipiaosaurus
  - From: "Tim Williams" <twilliams_alpha@hotmail.com>

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