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Re: [dinosaur] Juvenile tyrannosaurid mandible biomechanics and bite force (free pdf)



The link produces the article now

Sent from my iPad

On Mar 4, 2021, at 11:35, Mike Taylor <sauropoda@gmail.com> wrote:

Maybe they meant "This article has been embargoed FROM 01 March 2021" :-)

-- Mike.


On Thu, 4 Mar 2021 at 16:33, Thomas Richard Holtz <tholtz@umd.edu> wrote:
"This article has been embargoed for 01 March 2021."

Checks calendar.

Ummm....

On Thu, Mar 4, 2021 at 11:19 AM Alberta Claw <albertonykus@gmail.com> wrote:
Oddly, this article has now been replaced with the notice, "The accepted version of this article was mistakenly published and has been removed. This article has been embargoed for 01 March 2021."

On Tue, Feb 16, 2021 at 4:04 PM Ben Creisler <bcreisler@gmail.com> wrote:
 The paper is now in open access with a free pdf:


Andre J. Rowe & Eric Snively (2021)
Biomechanics of juvenile tyrannosaurid mandibles and their implications for bite force.
The Anatomical Record (advance online publication)
doi: https://doi.org/10.1002/ar.24602
https://anatomypubs.onlinelibrary.wiley.com/doi/10.1002/ar.24602


Free pdf:

On Mon, Feb 15, 2021 at 8:10 AM Ben Creisler <bcreisler@gmail.com> wrote:

Ben Creisler

A new paper:


Andre J. Rowe & Eric Snively (2021)
Biomechanics of juvenile tyrannosaurid mandibles and their implications for bite force.
The Anatomical Record (advance online publication)
doi: https://doi.org/10.1002/ar.24602
https://anatomypubs.onlinelibrary.wiley.com/doi/10.1002/ar.24602



The tyrannosaurids are among the most wellâstudied dinosaurs described by science, and analysis of their feeding biomechanics allows for comparison between established tyrannosaurid genera and across ontogeny. We used 3D finite element analysis (FEA) to model and quantify the mechanical properties of the mandibles (lower jaws) of three tyrannosaurine tyrannosaurids of different sizes. To increase evolutionary scope and context for 3D tyrannosaurine results, a broader sample of validated 2D mandible FEA enabled comparisons between ontogenetic stages of Tyrannosaurus rex and other large theropods. We found that mandibles of small juvenile and large subadult tyrannosaurs experienced lower stress overall because muscle forces were relatively lower, but experienced greater simulated stresses at decreasing sizes when specimen muscle force or surface area is normalized. Strain on postâdentary ligaments decreases stress and strain in the posterior region of the dentary and where teeth impacted food. Tension from the lateral insertion of the looping m. ventral pterygoid muscle increases compressive stress on the angular but may decrease anterior bending stress on the mandible. Low midâmandible bending stresses are congruent with ultraârobust teeth and high anterior bite force in adult Tyrannosaurus rex. Mandible strength increases with size through ontogeny in T. rex and phylogenetically among other tyrannosaurids, in addition to that tyrannosaurid mandibles exceed mandible strength of other theropods at equivalent ramus length. These results may indicate separate predatory strategies used by juvenile and mature tyrannosaurids; juvenile tyrannosaurids lacked the boneâcrunching bite of adult specimens and hunted smaller prey, while adult tyrannosaurids fed on larger prey.

Virus-free. www.avg.com


--

Thomas R. Holtz, Jr.
Email: tholtz@umd.edu         Phone: 301-405-4084
Principal Lecturer, Vertebrate Paleontology

Office: Geology 4106, 8000 Regents Dr., College Park MD 20742

Dept. of Geology, University of Maryland
http://www.geol.umd.edu/~tholtz/

Phone: 301-405-6965
Fax: 301-314-9661              

Faculty Director, Science & Global Change Program, College Park Scholars

Office: Centreville 1216, 4243 Valley Dr., College Park MD 20742
http://www.geol.umd.edu/sgc
Fax: 301-314-9843

Mailing Address:        Thomas R. Holtz, Jr.
                        Department of Geology
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                        8000 Regents Drive
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                        College Park, MD 20742-4211 USA