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Re: Dino nasal passages
At 11:36 PM 10/16/98 EDT, Greg Paul wrote:
>Anyway, got to take a look at two superbly 3-D
>preserved allosaurus snouts, including one with the internal view fully
I've seen some excellent X-rays of some of these (or perhaps other?)
specimens. Quite nice.
>These show that the avetheropod nasal passage was long and
>fairly complex. (Also, I do not think tyrannosaurs had a true "secondary
A curious statement, since tyrannosaurids clearly have an extension of the
premax and maxilla which contact the vomer along the midlength, hence a
solid roof to the mouth, hence a "secondary palate". The way they acheive
this anatomically is different from the way crocs or mammals do it, but it
is still a solid roof to the mouth. It is true that advanced
tyrannosaurines (_Tyrannosaurus_ in particular) has the most extensive
development, and that in more primitive forms it is best developed in the
front end of the snout. Nevertheless, most non-coelurosaurian theropods do
not show even this development.
Thomas R. Holtz, Jr.
Vertebrate Paleontologist Webpage: http://www.geol.umd.edu
Dept. of Geology Email:firstname.lastname@example.org
University of Maryland Phone:301-405-4084
College Park, MD 20742 Fax: 301-314-9661