Results 31 to 40 of about 448 (151)

An exceptionally preserved armored dinosaur reveals the morphology and allometry of osteoderms and their horny epidermal coverings [PDF]

open access: yesPeerJ, 2017
Although the evolution and function of “exaggerated” bony projections in ornithischian dinosaurs has been subject to significant debate recently, our understanding of the structure and morphology of their epidermal keratinized coverings is greatly ...
Caleb M. Brown
doaj   +2 more sources

Osteology and relationships of Revueltosaurus callenderi (Archosauria: Suchia) from the Upper Triassic (Norian) Chinle Formation of Petrified Forest National Park, Arizona, United States

open access: yesThe Anatomical Record, Volume 305, Issue 10, Page 2353-2414, October 2022., 2022
Abstract Once known solely from dental material and thought to represent an early ornithischian dinosaur, the early‐diverging pseudosuchian Revueltosaurus callenderi is described from a minimum of 12 skeletons from a monodominant bonebed in the upper part of the Chinle Formation of Arizona.
William G. Parker   +7 more
wiley   +1 more source

Jaw Mechanics in Basal Ceratopsia (Ornithischia, Dinosauria) [PDF]

open access: yesThe Anatomical Record, 2009
AbstractCeratopsian dinosaurs were a dominant group of herbivores in Cretaceous terrestrial ecosystems. We hypothesize that an understanding of the feeding system will provide important insight into the evolutionary success of these animals. The mandibular mechanics of eight genera of basal ceratopsians was examined to understand the variability in ...
Kyo, Tanoue   +3 more
openaire   +2 more sources

Asociacion faunistica de vertebrados mesozoicos de la localidad de Galve (Teruel)

open access: yesEstudios Geologicos, 2002
Los sedimentos del Tithónico-Barremiense de la Cuenca Ibérica aflorantes en los alrededores de la localidad de Galve (Teniel), son particularmente ricos en restos de vertebrados mesozoicos.
B. Sánchez Hemández
doaj   +1 more source

Dental microwear reveals mammal-like chewing in the neoceratopsian dinosaur Leptoceratops gracilis [PDF]

open access: yesPeerJ, 2016
Extensive oral processing of food through dental occlusion and orbital mandibular movement is often cited as a uniquely mammalian trait that contributed to their evolutionary success.
Frank J. Varriale
doaj   +2 more sources

The Rhabdodontidae (Dinosauria, Ornithischia), an enigmatic dinosaur group endemic to the Late Cretaceous European Archipelago [PDF]

open access: yesFossil Record, 2023
The Rhabdodontidae was one of the most important dinosaur groups inhabiting the Late Cretaceous European Archipelago. Currently, the clade comprises nine species within six genera, which have been found in southern France, northern Spain, eastern Austria,
Felix J. Augustin   +2 more
doaj   +3 more sources

Appendicular skeleton of Protoceratops andrewsi (Dinosauria, Ornithischia): comparative morphology, ontogenetic changes, and the implications for non-ceratopsid ceratopsian locomotion [PDF]

open access: yesPeerJ, 2019
Protoceratops andrewsi is a well-known ceratopsian dinosaur from the Djadokhta Formation (Upper Cretaceous, Mongolia). Since the 1920s, numerous skeletons of different ontogenetic stages from hatchlings to adults, including fully articulated specimens ...
Justyna Słowiak   +2 more
doaj   +2 more sources

The vertebrate fauna from the stipite layers of the Grands Causses (Middle Jurassic, France)

open access: yesFrontiers in Ecology and Evolution, 2014
The stipites are Bathonian (Middle Jurassic) coals that formed in an everglades-like environment and are now exposed in the Grands Causses (southern France).
Fabien eKnoll   +3 more
doaj   +1 more source

Integumentary structure and composition in an exceptionally well-preserved hadrosaur (Dinosauria: Ornithischia) [PDF]

open access: yesPeerJ, 2019
Preserved labile tissues (e.g., skin, muscle) in the fossil record of terrestrial vertebrates are increasingly becoming recognized as an important source of biological and taphonomic information.
Mauricio Barbi   +7 more
doaj   +2 more sources

Secondary cartilage revealed in a non-avian dinosaur embryo. [PDF]

open access: yesPLoS ONE, 2013
The skull and jaws of extant birds possess secondary cartilage, a tissue that arises after bone formation during embryonic development at articulations, ligamentous and muscular insertions.
Alida M Bailleul   +2 more
doaj   +1 more source

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