Results 21 to 30 of about 809 (146)

Cranial ontogenetic variation in early saurischians and the role of heterochrony in the diversification of predatory dinosaurs [PDF]

, 2016
Non-avian saurischian skulls underwent at least 165 million years of evolution and shapes varied from elongated skulls, such as in the theropod Coelophysis, to short and box-shaped skulls, such as in the sauropod Camarasaurus.
Ezcurra, Martin D., Foth​, Christian, Hedrick, Brandon P.   +2 more
core   +16 more sources

Consilient evidence affirms expansive stabilizing ligaments in the tyrannosaurid foot

Vertebrate Anatomy, Morphology, Palaeontology, 2022
Tyrannosaurid dinosaurs were ecologically unique vertebrates as the sole clade of large terrestrial carnivores (adults >400 kg) in their continent-spanning habitats.
Lara Surring, Michael Burns, Eric Snively, Daniel Barta, Thomas Holtz, Anthony Russell, Lawrence Witmer, Philip Currie   +7 more
doaj   +1 more source

Locomotor and postural diversity among reptiles viewed through the prism of femoral microanatomy: Palaeobiological implications for some Permian and Mesozoic taxa

Journal of Anatomy, Volume 242, Issue 5, Page 891-916, May 2023., 2023
Reptiles show great diversity of locomotion and posture. We employed phylogenetically informed statistical methods to explore their bone microanatomy. We used our models to infer the locomotion of extinct reptiles that document the different episodes of postural diversification in this clade.
Jordan Gônet, Jérémie Bardin, Marc Girondot, John R. Hutchinson, Michel Laurin   +4 more
wiley   +1 more source

Machine learning confirms new records of maniraptoran theropods in Middle Jurassic UK microvertebrate faunas

Papers in Palaeontology, Volume 9, Issue 2, March/April 2023., 2023
Abstract Current research suggests that the initial radiation of maniraptoran theropods occurred in the Middle Jurassic, although their fossil record is known almost exclusively from the Cretaceous. However, fossils of Jurassic maniraptorans are scarce, usually consisting solely of isolated teeth, and their identifications are often disputed.
Simon Wills, Charlie J. Underwood, Paul M. Barrett, Philip Mannion   +3 more
wiley   +1 more source

First application of dental microwear texture analysis to infer theropod feeding ecology

Palaeontology, Volume 65, Issue 6, November/December 2022., 2022
Abstract Theropods were the dominating apex predators in most Jurassic and Cretaceous terrestrial ecosystems. Their feeding ecology has always been of great interest, and new computational methods have yielded more detailed reconstructions of differences in theropod feeding behaviour. Many approaches, however, rely on well‐preserved skulls.
Daniela E. Winkler, Tai Kubo, Mugino O. Kubo, Thomas M. Kaiser, Thomas Tütken, Laura Porro   +5 more
wiley   +1 more source

Anatomy and relationships of the early diverging Crocodylomorphs Junggarsuchus sloani and Dibothrosuchus elaphros

The Anatomical Record, Volume 305, Issue 10, Page 2463-2556, October 2022., 2022
Abstract The holotype of Junggarsuchus sloani, from the Shishugou Formation (early Late Jurassic) of Xinjiang, China, consists of a nearly complete skull and the anterior half of an articulated skeleton, including the pectoral girdles, nearly complete forelimbs, vertebral column, and ribs.
Alexander A. Ruebenstahl, Michael D. Klein, Hongyu Yi, Xing Xu, James M. Clark   +4 more
wiley   +1 more source

Biomechanics of juvenile tyrannosaurid mandibles and their implications for bite force: Evolutionary biology

The Anatomical Record, Volume 305, Issue 2, Page 373-392, February 2022., 2022
Abstract The tyrannosaurids are among the most well‐studied dinosaurs described by science, and analysis of their feeding biomechanics allows for comparison between established tyrannosaurid genera and across ontogeny. 3D finite element analysis (FEA) was used to model and quantify the mechanical properties of the mandibles (lower jaws) of three ...
Andre J. Rowe, Eric Snively
wiley   +1 more source

Morphology of the temporal skull region in tetrapods: research history, functional explanations, and a new comprehensive classification scheme

Biological Reviews, Volume 96, Issue 5, Page 2229-2257, October 2021., 2021
ABSTRACT The morphology of the temporal region in the tetrapod skull traditionally has been a widely discussed feature of vertebrate anatomy. The evolution of different temporal openings in Amniota (mammals, birds, and reptiles), Lissamphibia (frogs, salamanders, and caecilians), and several extinct tetrapod groups has sparked debates on the ...
Pascal Abel, Ingmar Werneburg
wiley   +1 more source

The anatomy of Dryptosaurus aquilunguis (Dinosauria:Theropoda) and a review of its tyrannosauroid affinities [PDF]

, 2011
no ...
Benson, R.B.J., Brusatte, S.L., Norell, M.A.   +2 more
core   +2 more sources

Cranial anatomy and stratigraphy of a new specimen of the tyrannosaurine dinosaur Daspletosaurus from the Judith River Formation of Central Montana, USA [PDF]

Acta Palaeontologica Polonica
The tyrannosaurine Daspletosaurus contains three recognized species from the Campanian of Montana and Alberta: Daspletosaurus torosus, Daspletosaurus wilsoni, and Daspletosaurus horneri. The recently named D. wilsoni has been proposed to represent a
ETHAN WARNER-COWGILL, GLENN W. STORRS, RAYMOND R. ROGERS, ANTHONY E. MALTESE   +3 more
doaj   +1 more source