Results 31 to 40 of about 580 (139)

A Probable Neoceratopsian Manus Track from the Nanushuk Formation (Albian, Northern Alaska) [PDF]

, 2010
We report a likely neoceratopsian manus track from an exposure of the Nanushuk Formation along the Colville River in northern Alaska. The track described here containts the impressions of five digits, arranged as an arc, which identify this specimen as a
Decker, P. L., Fiorillo, A. R., LePain, D. L., McCarthy, P. J., Wartes, M.   +4 more
core   +2 more sources

Ontogenetic stages of ceratopsian dinosaur Psittacosaurus in bone histology [PDF]

Acta Palaeontologica Polonica, 2019
The early ceratopsians Psittacosaurus and Protoceratops have provided important information on dinosaurian development because of abundant specimens of adults, subadults, juveniles, and even hatchlings.
Qi Zhao, Michael J. Benton, Shoji Hayashi, Xing Xu   +3 more
doaj   +1 more source

Body mass estimates of an exceptionally complete Stegosaurus (Ornithischia: Thyreophora): comparing volumetric and linear bivariate mass estimation methods [PDF]

, 2015
© 2015 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. The file
Charlotte A. Brassey, Kilbourne BM, Mallison H, Mazzetta G, Paul M. Barrett, Susannah C. R. Maidment   +5 more
core   +1 more source

Head size, weaponry, and cervical adaptation: Testing craniocervical evolutionary hypotheses in Ceratopsia.

Evolution; international journal of organic evolution, 2016
The anterior cervical vertebrae form the skeletal connection between the cranial and postcranial skeletons in higher tetrapods. As a result, the morphology of the atlas-axis complex is likely to be shaped by selection pressures acting on either the head or neck.
VanBuren, Collin S., Campione, Nicolás E., Evans, David C.   +2 more
openaire   +4 more sources

Limb-Bone Scaling Indicates Diverse Stance and Gait in Quadrupedal Ornithischian Dinosaurs [PDF]

, 2012
Background The most primitive ornithischian dinosaurs were small bipeds, but quadrupedality evolved three times independently in the clade. The transition to quadrupedality from bipedal ancestors is rare in the history of terrestrial vertebrate ...
Barrett, PM, Linton, DH, Maidment, SCR, Upchurch, P   +3 more
core   +1 more source

A revision of Sanpasaurus yaoi Young, 1944 from the Early Jurassic of China, and its relevance to the early evolution of Sauropoda (Dinosauria) [PDF]

, 2016
© 2016 McPhee et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it
Allain, Bai, Bandyopadhyay, Barrett, Barrett, Barrett, Bonaparte, Bonnan, Buffetaut, Chen, Colbert, Cooper, Cúneo, Dong, Dong, Galton, Gilmore, Hatcher, He, He, Horner, International Commission on Zoological Nomenclature, Jain, Li, Lü, Maidment, Maidment, Maidment, Mateus, McPhee, McPhee, McPhee, Meng, Mo, Nair, Norman, Osborn, Otero, Ouyang, Ouyang, Owen, Peng, Pi, Raath, Remes, Remes, Rozhdestvensky, Sekiya, Sereno, Upchurch, Upchurch, Upchurch, Upchurch, Upchurch, Upchurch, Upchurch, Upchurch, Wang, Weishampel, Weishampel, Wilson, Wilson, Wilson, Xing, Yadagiri, Yates, Yates, Yates, Yates, Young, Young, Young, Zhang, Zhang, Zhao, Zhou   +75 more
core   +9 more sources

Histological evidence for a supraspinous ligament in sauropod dinosaurs [PDF]

, 2015
Supraspinous ossified rods have been reported in the sacra of some derived sauropod dinosaurs. Although different hypotheses have been proposed to explain the origin ofthis structure, histological evidence has never been provided to support or reject any
Abdalla O, Abdel Meguid EM, Barreto C, Bonaparte JF, Bonaparte JF, Campos D, Casal GA, Casal GA, Cerda IA, Cerda IA, Chinsamy A, Chinsamy-Turan A, Francillon-Vieillot H, García RA, Giménez O, Gomani M, Güner A, Hamdam TA, Hatcher JB, Henderson D, Heylings DJA, Horner JR, Janensch W, Janensch W, Kellner AWA, Mcintosh JS, Morocutti M, Novas FE, Osborn HF, Powell JE, Powell JE, Powell JE, Reid REH, Sandqvist AV, Strocchi R, Yayama T, You H-L, Zhang Y   +37 more
core   +2 more sources

A survey of dinosaur diversity by clade, age, place of discovery and year of description [PDF]

, 2014
Dinosaur diversity is analyzed in terms of the number of valid genera within each major clade, Mesozoic age, place of discovery and year of description. Aves (Archaeopteryx + Neornithes) is excluded. Nomina nuda and nomina dubia are not counted.
Taylor, Michael
core   +3 more sources

The enamel microstructure of Manidens condorensis: New hypotheses on the ancestral state and evolution of enamel in Ornithischia [PDF]

, 2020
Previous studies on enamel microstructure in Ornithischia have focused on derived lineages of this clade based on species from the northern hemisphere.
Becerra, Marcos Gabriel, Pol, Diego
core   +1 more source

Using crocodilian tails as models for dinosaur tails [PDF]

, 2015
The tails of extant crocodilians are anatomically the closest approximation of the tails of non-avian dinosaurs, and therefore a good starting point for any reconstruction of non-avian dinosaur tail muscles.
Mallison, H, Pittman, MD, Schwarz, D
core   +1 more source