Results 21 to 30 of about 784 (138)

A SUBADULT MAXILLA OF A TYRANNOSAURIDAE FROM THE TWO MEDICINE FORMATION, MONTANA, UNITED STATES [PDF]

Papéis Avulsos de Zoologia
Daspletosaurus is a Campanian genus of Tyrannosauridae from North America. This genus occupied the same geographic area of Albertosaurus, but remains of Albertosaurus are more abundant than Daspletosaurus.
RAFAEL DELCOURT
doaj   +2 more sources

Correction: a 'terror of tyrannosaurs': the first trackways of tyrannosaurids and evidence of gregariousness and pathology in tyrannosauridae. [PDF]

PLoS ONE, 2015
[This corrects the article DOI: 10.1371/journal.pone.0103613.].
PLOS ONE Staff
doaj   +2 more sources

Cancellous bone and theropod dinosaur locomotion. Part III—Inferring posture and locomotor biomechanics in extinct theropods, and its evolution on the line to birds [PDF]

PeerJ, 2018
This paper is the last of a three-part series that investigates the architecture of cancellous bone in the main hindlimb bones of theropod dinosaurs, and uses cancellous bone architectural patterns to infer locomotor biomechanics in extinct non-avian ...
Abourachid, Alexander, Allen, Allen, Allmendinger, Attene, Bakker, Bates, Bates, Bates, Bates, Beer, Benson, Biewener, Biewener, Biewener, Bishop, Bishop, Bishop, Bishop, Bishop, Blob, Brochu, Brusatte, Butcher, Campione, Cardozo, Carrano, Carrano, Carrano, Carrano, Christiansen, Christiansen, Clack, Dececchi, Delp, Farlow, Farlow, Fujiwara, Gao, Gatesy, Gatesy, Gatesy, Gatesy, Gatesy, Gatesy, Gatesy, Gatesy, Gatesy, Gatesy, Gatesy, Gatesy, Gilmore, Heers, Henderson, Henderson, Holtz, Horner, Hotton, Hutchinson, Hutchinson, Hutchinson, Hutchinson, Hutchinson, Hutchinson, Hutchinson, Hutchinson, Hutchinson, Hutchinson, Hutchinson, Hutchinson, Hutchinson, Jacobson, Johnson, Kambic, Kambic, Keller, Kemp, Lai, Lambe, Lautenschlager, Lee, Marsh, Martelli, McCrea, Molnar, Norell, Norell, Osborn, Ostrom, Paul, Pauwels, Pierce, Pittman, Rauhut, Reilly, Roberts, Rubenson, Russell, Sellers, Sellers, Snively, Stevens, Taylor, Thewissen, Thulborn, Tsai, Tsai, Tsuihiji, Unwin, Valente, Van Der Reest, Villette, Wall-Scheffler, Wilson, Xu, Xu, Zelenitsky   +117 more
core   +2 more sources

Ontogenetic Changes in Endocranial Anatomy in Gorgosaurus libratus (Theropoda: Tyrannosauridae) Provide Insight Into the Evolution of the Tyrannosauroid Endocranium. [PDF]

J Comp Neurol
Changes through growth (ontogenetic) in the braincase of the eutyrannosaurian tyrannosauroid Gorgosaurus libratus are discussed. Most notably, brain cavity endocasts of immature Gorgosaurus are found to more clearly show details of the brain morphology than more mature individuals, a finding that has implications for improving dinosaur paleoneurology ...
Voris JT, Therrien F, Ridgely RC, Witmer LM, Zelenitsky DK.   +4 more
europepmc   +2 more sources

Skull morphology and histology indicate the presence of an unexpected buccal soft tissue structure in dinosaurs. [PDF]

J Anat
A combined approach of osteology and histology was used to examine the cheek regions of dinosaurs. Strong evidence was found for a soft tissue in this region connecting the zygoma to the mandible, here named the ‘exoparia’. Abstract Unlike mammals, reptiles typically lack large muscles and ligaments that connect the zygoma to the mandible.
Sharpe HS, Wang YY, Dudgeon TW, Powers MJ, Whitebone SA, Coppock CC, Dyer AD, Sullivan C.   +7 more
europepmc   +2 more sources

The comparative energetics of the turtles and crocodiles. [PDF]

Ecol Evol, 2022
This paper discusses patterns in Dynamic Energy Budget parameters and implied traits that we found for turtles and crocodiles. We explain, for instance, why the proportionality of weight at birth with the square root of ultimate weight points to problems with water loss and nitrogen‐waste accumulation.
Marn N, Kooijman SALM.
europepmc   +2 more sources

Allometric growth in the frontals of the Mongolian theropod dinosaur Tarbosaurus bataar [PDF]

Acta Palaeontologica Polonica, 2022
Tarbosaurus bataar is a sister taxon of the well-studied theropod dinosaur Tyrannosaurus rex, and numerous fossils of this tyrannosaurid have been discovered in the Upper Cretaceous Nemegt Formation of Mongolia. Although specimens of different sizes of
CHAN-GYU YUN, GALADRIEL FREEMAN PETERS, PHILIP JOHN CURRIE   +2 more
doaj   +1 more source

A Problematic Tyrannosaurid (Dinosauria: Theropoda) Skeleton and Its Implications for Tyrannosaurid Diversity in the Horseshoe Canyon Formation (Upper Cretaceous) of Alberta. [PDF]

Anat Rec (Hoboken), 2020
ABSTRACT Several published censuses have noted the presence of two tyrannosaurids, Daspletosaurus sp. and Albertosaurus sarcophagus, within the Upper Cretaceous Horseshoe Canyon Formation of Alberta. Although A. sarcophagus is known from more than a dozen major discoveries in these strata, Daspletosaurus sp.
Mallon JC, Bura JR, Schumann D, Currie PJ.   +3 more
europepmc   +2 more sources

Tyrant dinosaur evolution tracks the rise and fall of Late Cretaceous oceans. [PDF]

PLoS ONE, 2013
The Late Cretaceous (∼95-66 million years ago) western North American landmass of Laramidia displayed heightened non-marine vertebrate diversity and intracontinental regionalism relative to other latest Cretaceous Laurasian ecosystems.
Mark A Loewen, Randall B Irmis, Joseph J W Sertich, Philip J Currie, Scott D Sampson   +4 more
doaj   +1 more source

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