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Re: Spinosaurid Nose Job



Steven Coombs (gasperex@hotmail.com) wrote:

<Now all Spinosaurids like Baryonyx and Suchomimus have there nasal
cavity pretty colse to there eyes than other theropods, does the nose
really have to be above the mouth? If so this would be a long passage
way, compare to other theropods such as Allosaurus ot even T.rex.>

  The nostrils would not extend rostral to the external nares. In
Witmer's paper, of which I get the gist having looked at the problem
myself, and having enjoyed the man's work on the subject, the
external nares also bear a vascular and enfossate surface external to
the narial margin. In tyrannosaurs, and many other theropods, this
fossa extends to the very front of the snout, in others, it doesn't.
Spinosaurid snouts have a short fossa, and the nares would be fairly
located there. In diplodocids, the fossa is quite long and well
rostral to the antorbital fenestra, and delineates a discernible
narial tract. One can posit this for other sauropods for which a
large narial fossa is present on the maxillae and premaxillae, and I
would further offer and have illustrations once I scan them in, of
the structure and position of the nose in *Brachiosaurus,* at the
very front of the snout. Witmer is further working on the more
complex ceratopid nasal structure.

=====
Jaime A. Headden

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

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