Results 1 to 10 of about 2,952 (213)

Origins of Avian Hyperactive Mitochondria, Genome Compaction, and Air-Sac Physiology in Early Theropods During the Carnian Pluvial Episode [PDF]

Journal of Developmental Biology
Extant birds and the earliest dinosaurs may share fundamental metabolic features essential for aerobic exercise, suggesting that the extraordinary physical performance typical of avian species originated when dinosaurs first appeared during the Carnian ...
Takumi Satoh
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   +4 more sources

Evolutionary decoupling between cranial shape and size underlies divergent evolutionary pathways in Cretaceous apex and meso-predator theropods [PDF]

Communications Biology
Apex and meso-predators of the Cretaceous exhibited distinct macroevolutionary trajectories, reflecting differential responses to ecological and environmental pressures.
Enzo Emanuel Seculi Pereyra
doaj   +2 more sources

Forelimb biomechanics in the derived therizinosaur Nothronychus and its relation to the origin of the avian wing [PDF]

Scientific Reports
Therizinosauria is a clade of extinct unusual maniraptoran theropods. Nothronychus is a derived representative of the clade from the upper Cretaceous Moreno Hill Formation, west-central New Mexico and Tropic Shale, southern Utah.
David K. Smith
doaj   +2 more sources

Bite and tooth marks on sauropod dinosaurs from the Morrison Formation [PDF]

PeerJ, 2023
Tooth-marked bones provide important evidence for feeding choices made by extinct carnivorous animals. In the case of the dinosaurs, most bite traces are attributed to the large and robust osteophagous tyrannosaurs, but those of other large carnivores ...
Roberto Lei, Emanuel Tschopp, Christophe Hendrickx, Mathew J. Wedel, Mark Norell, David W.E. Hone   +5 more
doaj   +2 more sources

New theropod remains and implications for megaraptorid diversity in the Winton Formation (lower Upper Cretaceous), Queensland, Australia [PDF]

Royal Society Open Science, 2020
The holotype specimen of the megaraptorid Australovenator wintonensis, from the Upper Cretaceous Winton Formation (Rolling Downs Group, Eromanga Basin) of central Queensland, is the most complete non-avian theropod found in Australia to date.
Matt A. White, Phil R. Bell, Stephen F. Poropat, Adele H. Pentland, Samantha L. Rigby, Alex G. Cook, Trish Sloan, David A. Elliott   +7 more
doaj   +1 more source

Egg shape changes at the theropod–bird transition, and a morphometric study of amniote eggs [PDF]

Royal Society Open Science, 2014
The eggs of amniotes exhibit a remarkable variety of shapes, from spherical to elongate and from symmetrical to asymmetrical. We examine eggshell geometry in a diverse sample of fossil and living amniotes using geometric morphometrics and linear ...
D. Charles Deeming, Marcello Ruta
doaj   +1 more source

FIRST THEROPOD RECORD FROM THE MARINE BATHONIAN OF JAISALMER BASIN, TETHYAN COAST OF GONDWANAN INDIA

Rivista Italiana di Paleontologia e Stratigrafia, 2023
Middle Jurassic theropods have a scanty record worldwide, especially from Gondwana. In India, where Jurassic theropods are particularly rare and only represented by a few isolated teeth and some badly preserved bones, there is currently no record of ...
Archana Sharma, CHRISTOPHE HENDRICKX, SANJAY SINGH   +2 more
doaj   +1 more source

The non-avian theropod quadrate I: standardized terminology with an overview of the anatomy and function [PDF]

PeerJ, 2015
The quadrate of reptiles and most other tetrapods plays an important morphofunctional role by allowing the articulation of the mandible with the cranium.
Christophe Hendrickx, Ricardo Araújo, Octávio Mateus   +2 more
doaj   +2 more sources

Incremental growth of therizinosaurian dental tissues: implications for dietary transitions in Theropoda [PDF]

PeerJ, 2017
Previous investigations document functional and phylogenetic signals in the histology of dinosaur teeth. In particular, incremental lines in dentin have been used to determine tooth growth and replacement rates in several dinosaurian clades.
Khai Button, Hailu You, James I. Kirkland, Lindsay Zanno   +3 more
doaj   +2 more sources