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RE: Basal Theropod Arm Position

Given how relatively small the manual extremity was, unless there was a lot of 
fleshy addon to the arm, tucked up against the body wall as in crocodilians, 
extended and not folded. BIG speculation, though.


  Jaime A. Headden
  The Bite Stuff (site v2)

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

"Ever since man first left his cave and met a stranger with a
different language and a new way of looking at things, the human race
has had a dream: to kill him, so we don't have to learn his language or
his new way of looking at things." --- Zapp Brannigan (Beast With a Billion 

> Date: Sun, 18 Sep 2011 15:56:41 -0600
> From: jharris@dixie.edu
> To: dinosaur@usc.edu
> Subject: Basal Theropod Arm Position
> A hypothetical question for y'all: in what position, d'you think, would a 
> basal theropod, such as a coelophysoid, hold its arms while swimming? Given 
> the absence of the bird-like wing-folding ability at all joints, and given 
> the relatively limited flexibility at the shoulders and elbows described by 
> Carpenter (2002), what's the alternative in order to prevent the arms from 
> acting as baffles and maximize hydrodynamicity? Would they be kept swept 
> backward, croc-like? Even if Carpenter's limits are off, which I might expect 
> based on the more recent works that have shown that dinosaurs probably had 
> great, heaping gobs o' cartilage at the joints, which likely enhanced 
> mobility, I still don't see coelophysoids having anything close to a 
> wing-like folding ability...
> Carpenter, K. 2002. Forelimb biomechanics of nonavian theropod dinosaurs in 
> predation; pp. 59–76 in Gudo, M., Gutmann, M., and Scholz, J. (eds.), 
> Concepts of Functional, Engineering and Constructional Morphology. 
> Senckenbergiana Lethaea 82. E. Schweizerbart'sche Verlagsbuchhandlung, 
> Frankfurt.
> --
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> Dr. Jerry D. Harris
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