[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: New review paper of tyrannosaur paleobiology in Science, with new phylogeny
Can somebody explain to me the weird trend in Brusatte tyrannosaur articles
where he ignores some of his own points about ontogeny.
On the one hand, he states that tyrannosaurid skulls elongate through ontogeny,
teeth become more robust, yet on the other hand claims these same characters
important features of Alioramus, which the authors acknowledge is based on a
juvenile specimen and derives form the same deposits as Tarbosaurus. IIRC
Alioramus is justified by the apparent elaborate skull ornamentation. However,
skull ornamentation in dinosaurs can often be less pronounced/elaborate in
adults (Horner & Goodwin, Triceratops). Brusatte cites this in the Alioramus
description, but makes the opposite claim.
----- Original Message ----
From: "Thomas R. Holtz, Jr." <firstname.lastname@example.org>
To: DML <email@example.com>
Sent: Thu, 16 September, 2010 12:18:55
Subject: New review paper of tyrannosaur paleobiology in Science, with new
Brusatte, S.L., M.A. Norell, T.D. Carr, G.M. Erickson, J.R. Hutchinson, A.M.
Balanoff, G.S. Bever, J.N. Choiniere, P.J. Makovicky, & X. Xu. 2010. Review:
Tyrannosaur Paleobiology: New Research on Ancient Exemplar Organisms.
Science 329: 1481-1485.
Tyrannosaurs, the group of dinosaurian carnivores that includes
Tyrannosaurus rex and its closest relatives, are icons of prehistory. They
are also the most intensively studied extinct dinosaurs, and thanks to large
sample sizes and an influx of new discoveries, have become ancient exemplar
organisms used to study many themes in vertebrate paleontology. A phylogeny
that includes recently described species shows that tyrannosaurs originated
by the Middle Jurassic but remained mostly small and ecologically marginal
until the latest Cretaceous. Anatomical, biomechanical, and histological
studies of T. rex and other derived tyrannosaurs show t
rapidly, were capable of crushing bite forces,
had accelerated growth rates and keen senses, and underwent pronounced
changes during ontogeny. The biology and evolutionary history of
tyrannosaurs provide a foundation for comparison with other dinosaurs and
A review paper, not new research as such. But Brusatte & Carr have pooled
their resources to produce a new phylogeny:
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, Science & Global Change 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