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RE: ORNITHISCHIA IS VERY, VERY REAL




Jaime,
Do you know if predentaries (or anything homologous or analogous) been found in any archosauromorphs other than ornithischians or certain birds?
Is the caudal interdentary ramus found in all neornithschians, or is it lost/modified in some advanced forms?
-----Cheers, Ken
*********************************************************
From: "Jaime A. Headden" <qilongia@yahoo.com>
Reply-To: qilongia@yahoo.com
To: dinosaur@usc.edu
CC: dino.hunter@home.com
Subject: RE: ORNITHISCHIA IS VERY, VERY REAL
Date: Tue, 19 Jun 2001 20:12:39 -0700 (PDT)

Tracy Ford (at his newer, cooler, email:
dino.hunter@home.com)wrote:

<An ankylosaurid looks different than a ceratopian than a
hadrosaur. No predentary has been found for a pachycephalosaur
but I?d imagine that they would.>

  The lower jaw of ankylosaurians is different from anything
archosaurian, especially in the inflection of the symphysis,
sigmoid dental row, and form of the jaw mesially and lingually.
One would expect any predental element to be different. From
early on, ankylosaurs were the first wide-mouthed feeders,
high-volume consumers. So you see a nearly corrollary transition
from narrow to round to wide-bodied guts. The predentary in
ankylosaurs stills preserves the caudal inter dentary ramus, and
thus continues to be united with Neornithischia (Ornithischia
sans *Pisanosaurus*).

=====
Jaime A. Headden

  Aaaaaaaaaaaaaaaaaaaahhhhhhhhhhhhhhhhhhr-gen-ti-na
  Where the Wind Comes Sweeping Down the Pampas!!!!

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