Results 61 to 70 of about 4,665 (222)

Tyrannosaurid and other probable theropod tracks.

, 2022
A, photograph and B, digital elevation model of tyrannosaurid track Ty.I.8C, medium theropod-like track Th.I.8C, and small theropod-like track Th.Tw2.2.9C. C, photograph and D, digital elevation model of cf. Ornithomimipus track Th.Tw1.4.6B.
Phil R. Bell (7238132), Nicolás E. Campione (10679841), Corwin Sullivan (344770), Matthew J. Vavrek (10679847), Federico Fanti (184567), Matt A. White (7483091), Robin L. Sissons (10679844), Nathan J. Enriquez (10679838)   +7 more
core   +1 more source

Pendraig milnerae, a new small-sized coelophysoid theropod from the Late Triassic of Wales

Royal Society Open Science, 2021
We describe a new small-bodied coelophysoid theropod dinosaur, Pendraig milnerae gen. et sp. nov, from the Late Triassic fissure fill deposits of Pant-y-ffynnon in southern Wales.
Stephan N. F. Spiekman, Martín D. Ezcurra, Richard J. Butler, Nicholas C. Fraser, Susannah C. R. Maidment   +4 more
doaj   +1 more source

Computed tomography reveals multiple origins of extreme caudal vertebral pneumaticity in sauropod dinosaurs

Journal of Anatomy, EarlyView.
Here, we present novel CT scan data of caudal vertebrae of six Middle–Late Jurassic sauropods, representing several eusauropod lineages. We synthesise these new data with a comprehensive critical appraisal of purported external and internal evidence for caudal vertebral PSP in Sauropodomorpha.
Samantha L. Beeston, Daniela Schwarz, Paul Upchurch, Stephen F. Poropat, Patrick Asbach, Philip D. Mannion   +5 more
wiley   +1 more source

Chimerism in specimens referred to Saurophaganax maximus reveals a new species of Allosaurus (Dinosauria, Theropoda)

Vertebrate Anatomy, Morphology, Palaeontology
Saurophaganax maximus is the designation of a massive theropod dinosaur recovered from the Kenton Member of the Upper Jurassic Morrison Formation in Oklahoma.
Andrew Danison, Mathew Wedel, Daniel Barta, Holly Woodward, Holley Flora, Andrew Lee, Eric Snively   +6 more
doaj   +1 more source

Evolution of high tooth replacement rates in theropod dinosaurs.

PLoS ONE, 2019
Tooth replacement rate is an important contributor to feeding ecology for polyphyodont animals. Dinosaurs exhibit a wide range of tooth replacement rates, mirroring their diverse craniofacial specializations, but little is known about broad-scale ...
Michael D D'Emic, Patrick M O'Connor, Thomas R Pascucci, Joanna N Gavras, Elizabeth Mardakhayava, Eric K Lund   +5 more
doaj   +1 more source

High frequencies of theropod bite marks provide evidence for feeding, scavenging, and possible cannibalism in a stressed Late Jurassic ecosystem.

PLoS ONE, 2020
Bite marks provide direct evidence for trophic interactions and competition in the fossil record. However, variations in paleoecological dynamics, such as trophic relationships, feeding behavior, and food availability, govern the frequency of these ...
Stephanie K Drumheller, Julia B McHugh, Miriam Kane, Anja Riedel, Domenic C D'Amore   +4 more
doaj   +1 more source

Growth dynamics of Australia's polar dinosaurs. [PDF]

PLoS ONE, 2011
Analysis of bone microstructure in ornithopod and theropod dinosaurs from Victoria, Australia, documents ontogenetic changes, providing insight into the dinosaurs' successful habitation of Cretaceous Antarctic environments.
Holly N Woodward, Thomas H Rich, Anusuya Chinsamy, Patricia Vickers-Rich   +3 more
doaj   +1 more source

How do forelimb long bones adapt in rhinoceroses? An in‐depth examination of their microanatomy

Journal of Anatomy, EarlyView.
Here, we study the bone structure in the forelimb long bones of the five extant species of rhinoceroses. By combining traditional description of virtual sections made on the bones (A) with in‐depth cartographies of the variation of bone compactness and anisotropy (B), we show how bone tissue can adapt to extreme forces and constraints in the second ...
Cyril Etienne, Axel de Jesus, Vincent Fernandez, Alexandra Houssaye   +3 more
wiley   +1 more source

Theropod footprints at Gara Sbaa.

, 2014
A, Large isolated natural cast of theropod track (not collected). B, Relatively poorly defined natural cast of a theropod track (not collected). Scale bar equals 10 cm in B.
Paul C. Sereno (36583), Jeff A. Wilson (531956), Didier B. Dutheil (53097), Samir Zouhri (364453), David J. Varricchio (132149), Lahssen Baidder (364452), Nizar Ibrahim (364450), David M. Martill (364451)   +7 more
core   +1 more source

Homologies and homeotic transformation of the theropod ‘semilunate’ carpal [PDF]

Scientific Reports, 2014
The homology of the 'semilunate' carpal, an important structure linking non-avian and avian dinosaurs, has been controversial. Here we describe the morphology of some theropod wrists, demonstrating that the 'semilunate' carpal is not formed by the same carpal elements in all theropods possessing this feature and that the involvement of the lateralmost ...
Xu, Xing, Han, Fenglu, Zhao, Qi
openaire   +2 more sources