Results 61 to 70 of about 7,261 (219)

New dinosaur (Theropoda, stem-Averostra) from the earliest Jurassic of the La Quinta formation, Venezuelan Andes [PDF]

Royal Society Open Science, 2014
Dinosaur skeletal remains are almost unknown from northern South America. One of the few exceptions comes from a small outcrop in the northernmost extension of the Andes, along the western border of Venezuela, where strata of the La Quinta Formation have
Max C. Langer, Ascanio D. Rincón, Jahandar Ramezani, Andrés Solórzano, Oliver W. M. Rauhut   +4 more
doaj   +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

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]

, 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   +3 more sources

New craniodental materials of Falcarius utahensis (Theropoda: Therizinosauria) reveal patterns of intraspecific variation and cranial evolution in early coelurosaurians

The Anatomical Record, EarlyView.
Abstract Despite documented ecomorphological shifts toward an herbivorous diet in several coelurosaurian lineages, the evolutionary tempo and mode of these changes remain poorly understood, hampered by sparse cranial materials for early representatives of major clades. This is particularly true for Therizinosauria, with representative crania best known
William J. Freimuth, Lindsay E. Zanno
wiley   +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

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

A Jurassic ornithischian dinosaur from Siberia with both feathers and scales [PDF]

, 2014
Feathers, not just for the birds? Theropod dinosaurs, thought to be the direct ancestors of birds, sported birdlike feathers. But were they the only feathery dino group? Godefroit et al.
Benton, Michael J, Bolotsky, Yuri L, Dhouailly, Danielle, Godefroit, Pascal, McNamara, Maria E, Sinitsa, Sofia M, Sizov, Alexander V, Spagna, Paul   +7 more
core   +1 more source

The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica

The Anatomical Record, EarlyView.
Abstract The upper carbonate concretion levels of the Romualdo Formation (Aptian, Brazil) have yielded several theropod dinosaur remains, including spinosaurids and the coelurosaurs Santanaraptor placidus and Mirischia asymmetrica, the phylogenetic affinities of which are controversial.
Rafael Delcourt, Orlando Nelson Grillo, Christophe Hendrickx, Maximilian Kellermann, Max Cardoso Langer   +4 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

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