Results 61 to 70 of about 4,369 (218)

The muscle-powered bite of allosaurus (dinosauria; theropoda): an interpretation of cranio-dental morphology [PDF]

, 2003
11 pages, 7 figures.[EN] The skull morphology of Allosaurus has been the subject of functional interpretations which imply a predatory behaviour radically different from that recorded in any predatory land vertebrate.
Antón, Mauricio, Salesa, Manuel J., Sánchez, Israel Miguel, Turner, A.   +3 more
core   +2 more sources

Skeletal pathologies in extant crocodilians as a window into the paleopathology of fossil archosaurs

The Anatomical Record, EarlyView.
Abstract Crocodilians, together with birds, are the only extant relatives to many extinct archosaur groups, making them highly important for interpreting paleopathological conditions in a phylogenetic disease bracketing model. Despite this, comprehensive data on osteopathologies in crocodilians remain scarce.
Alexis Cornille, Kyla Beguesse, Ewan Wolff, Clemens Zinner, Patrick Asbach, François Clarac, Florian Witzmann   +6 more
wiley   +1 more source

Reply: Theropod-bird link reconsidered [PDF]

Nature, 1998
Norell et al. reply — First, maniraptoran theropods, and theropods with furculae, are known from the Late Jurassic period7,8, significantly closing the ‘gap’ discussed above. We did not say in our Scientific Correspondence1 that Velociraptor was a direct ancestor, only that dromaeosaurs are related to birds.
Mark A. Norell, Peter Makovicky, James A. Clark   +2 more
openaire   +1 more source

The anatomy and systematic position of the theropod dinosaur Chilantaisaurus tashuikouensis Hu, 1964 from the Early Cretaceous of Alanshan, People's Republic of China [PDF]

, 2008
There is little consensus on the systematic position of the colossal theropod dinosaur Chilantaisaurus tashuikouensis from the Cretaceous (Aptian–?Albian or Upper Cretaceous) Ulansuhai Formation of Inner Mongolia, which has been recovered as a derived ...
Barsbold, Britt, Carpenter, Charig, Chure, Coria, Currie, Dong, Galton, Gauthier, Harris, Holtz, Hu, Hutt, Kellner, Kobayashi, Kobayashi, Madsen, Madsen, Osmólska, Ostrom, Owen, Rauhut, Riabinin, ROGER B. J. BENSON, Sadleir, Sun, XU XING   +27 more
core   +1 more source

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

A bony-crested Jurassic dinosaur with evidence of iridescent plumage highlights complexity in early paravian evolution [PDF]

, 2018
The Jurassic Yanliao theropods have offered rare glimpses of the early paravian evolution and particularly of bird origins, but, with the exception of the bizarre scansoriopterygids, they have shown similar skeletal and integumentary morphologies.
Clarke, Julia A, D'Alba Altamirano, Liliana, Eliason, Chad M, Hu, Dongyu, Jiang, Jinkai, Li, Quanguo, Qiu, Rui, Shawkey, Matthew, Xu, Xing, Zhao, Cuilin   +9 more
core   +3 more sources

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

Assesment and interpretation of negative forelimb allometry in the evolution of non-avian Theropoda

Frontiers in Zoology, 2019
Background The origin of birds is marked by a significant decrease in body size along with an increase in relative forelimb size. However, before the evolution of flight, both traits may have already been related: It has been proposed that an ...
José A. Palma Liberona, Sergio Soto-Acuña, Marco A. Mendez, Alexander O. Vargas   +3 more
doaj   +1 more source

Histology and fossil diagenesis of a pterosaur tooth from the Crato Formation (Lower Cretaceous of Brazil)

The Anatomical Record, EarlyView.
Abstract Pterosaur dental biology remains poorly understood despite its importance for comprehending feeding strategies and flight adaptations. Here, we present the first comprehensive histological analysis of an ornithocheiriform pterosaur tooth from the Lower Cretaceous Crato Formation (Santana Group, Northeast Brazil).
Tito Aureliano, Matheus P. S. Rocha, Francisco P. Lima‐Filho, Aline M. Ghilardi   +3 more
wiley   +1 more source

Trace fossils on dinosaur bones reveal ecosystem dynamics along the coast of eastern North America during the latest Cretaceous [PDF]

PeerJ, 2018
Direct evidence of paleoecological processes is often rare when the fossil record is poor, as in the case of the Cretaceous of eastern North America. Here, I describe a femur and partial tibia shaft assignable to theropods from two Late Cretaceous sites ...
Chase D. Brownstein
doaj   +2 more sources