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Re: SVP DINORESPIRATION
At 07:42 AM 10/17/97 -0400, Michael wrote:
> 1. When did gastralia begin to develop in the tridatcyl theropods?
> 2. Did they develop in conjunction with the expansion of the rib cage
>or did one follow the other?
Your question has the wrong polarity. Gastralia are a VERY old feature:
most primitive amniotes have them. The reason non-ornithurine theropods had
gastralia was that they had not lost them yet.
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