Results 11 to 20 of about 809 (146)

Estimation of maximum body size in fossil species: A case study using Tyrannosaurus rex [PDF]

Ecology and Evolution
Among extant species, the ability to sample the extremes of body size—one of the most useful predictors of an individual's ecology—is highly unlikely. This improbability is further exaggerated when sampling the already incomplete fossil record.
Jordan C. Mallon, David W. E. Hone
doaj   +3 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   +4 more sources

New information on paleopathologies in non-avian theropod dinosaurs: a case study on South American abelisaurids [PDF]

BMC Ecology and Evolution
Studies on pathological fossil bones have allowed improving the knowledge of physiology and ecology, and consequently the life history of extinct organisms.
Mattia A. Baiano, Ignacio A. Cerda, Filippo Bertozzo, Diego Pol   +3 more
doaj   +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   +2 more sources

Lower rotational inertia and larger leg muscles indicate more rapid turns in tyrannosaurids than in other large theropods [PDF]

PeerJ, 2019
Synopsis Tyrannosaurid dinosaurs had large preserved leg muscle attachments and low rotational inertia relative to their body mass, indicating that they could turn more quickly than other large theropods.
Eric Snively, Haley O’Brien, Donald M. Henderson, Heinrich Mallison, Lara A. Surring, Michael E. Burns, Thomas R. Holtz Jr, Anthony P. Russell, Lawrence M. Witmer, Philip J. Currie, Scott A. Hartman, John R. Cotton   +11 more
doaj   +6 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 ...
Bishop PJ, Hocknull SA, Clemente CJ, Hutchinson JR, Farke AA, Barrett RS, Lloyd DG.   +6 more
europepmc   +5 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

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

Variation, variability, and the origin of the avian endocranium:Insights from the anatomy of alioramus altai (theropoda: Tyrannosauroidea) [PDF]

, 2011
The internal braincase anatomy of the holotype of Alioramus altai, a relatively small-bodied tyrannosauroid from the Late Cretaceous of Mongolia, was studied using high-resolution computed tomography.
AH Turner, Amy M. Balanoff, C Clabaut, CA Brochu, CA Brochu, Daphne Soares, DK Zelenitsky, F Ali, Gabe S. Bever, GM Erickson, GP Wagner, GP Wagner, GP Wagner, GS Bever, GS Bever, GS Bever, GS Bever, HCE Larsson, HE Evans, HF Osborn, HT Jerison, I Salazar-Ciudad, J Gauthier, J Klembara, J Margugán-Lobón, JC Sedlmayr, JH Hurum, JN Choiniere, L Lefebvre, LE Zanno, LM Witmer, LM Witmer, M Kirscher, Mark A. Norell, MJ Donoghue, MJ Sanderson, P Senter, PJ Currie, R Lewontin, RE Molnar, RL Young, SB Emerson, SD Sampson, SL Brusatte, SL Brusatte, SL Brusatte, SM Kurzanov, Stephen L. Brusatte, SV Saveliev, T Tsuihiji, TD Carr, TD Carr, TR Holtz Jr, TR Holtz Jr, V Källersjö, X Xu, X Xu, Z Csiki   +57 more
core   +15 more sources