[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
RE: Hadrosaurs outgrew tyrannosaurs
> From: owner-DINOSAUR@usc.edu [mailto:owner-DINOSAUR@usc.edu]
> On Behalf Of GUY LEAHY
> Interesting work! Here is the press release:
> And the full paper:
A great study, but unfortunately they have the evolutionary polarity of the
situation reversed. As I showed at SVP 2004, and at the Black Hills
Conference, and in a paper which I REAALLLYYY need to finish up and submit
(!!) tyrannosaurids are the weird ones, not hadrosaurids.
In brief: early initiation of rapid growth rate is found in ornithischians,
sauropodomorphs, basal theropods, carnosaurs, basal maniraptorans, and basal
tyrannosauroids. A delayed initiation of rapid growth rates occurs in
So it isn't hadrosaurids that evovled an early initiation of rapid growth
rates; they simply inherited it. That is not say that it wasn't maintained
for the exactly the reasons stated in their paper, however.
Thomas R. Holtz, Jr.
Email: firstname.lastname@example.org Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
Faculty Director, Earth, Life & Time Program, College Park Scholars
Mailing Address: Thomas R. Holtz, Jr.
Department of Geology
Building 237, Room 1117
University of Maryland
College Park, MD 20742 USA