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RE: Ornithischian dinosaur quadrupedality

David Marjanovic wrote, quoting from an abstract:

<"[...] a femur longer than the tibia are found to be robust correlates of 
quadrupedality in ornithischian dinosaurs."

Can this effect be distinguished from the correlations to size and to 

  Yes, technically. Or at least, in my assumptions, it should be correlated to 
distal insertions on the femoral shaft of the leg retractor muscles, such as 
caudofemoralis and iliofemoralis. These also imply a relatively vertical femur. 
Otherwise, we'd be told that large tyrannosaurids and abelisaurids are 
quadrupeds. Think about that one for a second.


  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: Fri, 21 Sep 2012 18:19:45 +0200
> From: david.marjanovic@gmx.at
> To: dinosaur@usc.edu
> Subject: Re: Ornithischian dinosaur quadrupedality