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RE: Saurischia and Ornithischia pelvis
There is no real selective advantage to the forward-pointing pubis: that is
simply the ancestral condition.
So the two major herbivorous clades approached increasing gut space in
different ways. Sauropodomorphs simply got bigger and bigger.
Ornithischians moved the pubis backwards, so they could retain a bigger gut
without size increase.
Thomas R. Holtz, Jr.
Email: email@example.com Phone: 301-405-4084
Senior Lecturer, Vertebrate Paleontology
Office: Geology 4106
Dept. of Geology, University of Maryland
Faculty Director, Science & Global Change Program, College Park Scholars
Office: Centreville 1216
Mailing Address: Thomas R. Holtz, Jr.
Department of Geology
Building 237, Room 1117
University of Maryland
College Park, MD 20742 USA
> -----Original Message-----
> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu] On Behalf Of
> Stuart Plotkin
> Sent: Thursday, July 09, 2015 9:16 PM
> To: firstname.lastname@example.org
> Subject: Saurischia and Ornithischia pelvis
> I could use some advice as to what are benefits the forward facing pubic bone
> in the saurichia vs the rear facing pubic bone in
> ornithischia? I was able to determine that the ornithischia pelvis allowed
> for a larger abdominal area for digestion, but what
> huge sauropod bellies? What selective advantage did these pelvic arrangements
> give to the two classes of dinosaurs? Thank you