Re: troodontids and tympanic recesses

["Jaime A. Headden" <qilongia@yahoo.com>]

SeanSt8579@aol.com wrote:

<Wanting to check it out, I noticed that the scoring was composite. So I
dont have to wade through all those papers, does anyone know offhand which
species he's talking about, and the relevant cite?>

  Columnellar pneumatic invasion occurs in most troodontids with a
braincase, including "Troodon" (aka, RTMP troodontid braincases) and
*Saurornithoides,* and *Byronosaurus.* Other species, like *Sinovenator,*
I am unsure of, as their descriptions are more limited or the material
less available to discovery, as in *Sinornithoides* in which this region
is obscured by matrix. Otherwise, I would suggest that you do, indeed,
wade through the papers. The variability by which various maniraptoran
theropods possess basal or advanced avian features is fairly extensive,
leading to the numerous hypotheses on which groups are closer to birds, or
not.


=====
Jaime A. Headden

  Little steps are often the hardest to take.  We are too used to making leaps 
in the face of adversity, that a simple skip is so hard to do.  We should all 
learn to walk soft, walk small, see the world around us rather than zoom by it.

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

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