The link produces the article now
Sent from my iPad 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....
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."
The paper is now in open access with a free pdf:
Free pdf:
Ben Creisler
A new paper:
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.
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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 Building 237, Room 1117 8000 Regents Drive University of Maryland College Park, MD 20742-4211 USA
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