Results 11 to 20 of about 2,538 (164)

New perspectives on body size and shape evolution in dinosaurs. [PDF]

Biol Rev Camb Philos Soc
ABSTRACT Diversity in the body shapes and sizes of dinosaurs was foundational to their widespread success during the Mesozoic era. The ability to quantify body size and form reliably is therefore critical to the study of dinosaur biology and evolution.
Dempsey M, Cross SRR, Maidment SCR, Hutchinson JR, Bates KT.   +4 more
europepmc   +2 more sources

Microstructure and development of the dermal ossicles of Antarctopelta oliveroi (Dinosauria, Ankylosauria): A complex morphogenetic system deciphered through three-dimensional X-ray microtomography. [PDF]

J Anat
Series of images of the dermal ossicle of Antarctopelta oliveroi (Dinosauria, Ankylosauria) illustrating (A) the 3D distribution of the vascular mesh in the ossicle; (B) the large volume of the numerous cells in periphery; (C) the radial orientation of the fiber bundles in the main core of the osteoderm (called basal plate); (D) the orthogonal ...
Sanchez S, de Ricqlès A, Ponstein J, Tafforeau P, Zylberberg L.   +4 more
europepmc   +2 more sources

Taxonomic, palaeobiological and evolutionary implications of a phylogenetic hypothesis for Ornithischia (Archosauria: Dinosauria)

Zoological Journal of the Linnean Society, 2022
The origin and evolutionary relationships of ornithischian dinosaurs are topics that have undergone a series of substantial revisions. At present there are several competing hypotheses concerning the relationship between Ornithischia and the other ...
D. Norman, M. Baron, M. Garcia, R. Müller   +3 more
semanticscholar   +1 more source

An early-diverging iguanodontian (Dinosauria: Rhabdodontomorpha) from the Late Cretaceous of North America

PLoS ONE, 2023
Intensifying macrovertebrate reconnaissance together with refined age-dating of mid-Cretaceous assemblages in recent decades is producing a more nuanced understanding of the impact of the Cretaceous Thermal Maximum on terrestrial ecosystems.
Lindsay E. Zanno, Terry A Gates, Haviv M Avrahami, Ryan T. Tucker, P. Makovicky   +4 more
semanticscholar   +1 more source

Dinosaur diversification rates were not in decline prior to the K-Pg boundary [PDF]

Royal Society Open Science, 2020
Determining the tempo and mode of non-avian dinosaur extinction is one of the most contentious issues in palaeobiology. Extensive disagreements remain over whether their extinction was catastrophic and geologically instantaneous or the culmination of ...
Joseph A. Bonsor, Paul M. Barrett, Thomas J. Raven, Natalie Cooper   +3 more
doaj   +1 more source

Neuroanatomy of the late Cretaceous Thescelosaurus neglectus (Neornithischia: Thescelosauridae) reveals novel ecological specialisations within Dinosauria

Scientific Reports, 2023
Ornithischian dinosaurs exhibited a diversity of ecologies, locomotory modes, and social structures, making them an ideal clade in which to study the evolution of neuroanatomy and behaviour. Here, we present a 3D digital reconstruction of the endocranial
David J. Button, Lindsay E. Zanno
semanticscholar   +1 more source

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

Fossil 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, A. Ősi, Z. Csiki-Sava   +2 more
semanticscholar   +1 more source

Skull of a dromaeosaurid dinosaur Shri devi from the Upper Cretaceous of the Gobi Desert suggests convergence to the North American forms

Acta Palaeontologica Polonica, 2023
Numerous dromaeosaurid taxa recovered from the Upper Cretaceous strata of the Gobi Desert raise questions over niche partitioning among closely related species.
ŁUKASZ CZEPIŃSKI
doaj   +1 more source

Microstructural and crystallographic evolution of palaeognath (Aves) eggshells

eLife, 2023
The avian palaeognath phylogeny has been recently revised significantly due to the advancement of genome-wide comparative analyses and provides the opportunity to trace the evolution of the microstructure and crystallography of modern dinosaur eggshells.
Seung Choi, Mark E Hauber, Lucas J Legendre, Noe-Heon Kim, Yuong-Nam Lee, David J Varricchio   +5 more
doaj   +1 more source

Iridescent plumage in a juvenile dromaeosaurid theropod dinosaur

Acta Palaeontologica Polonica, 2023
Colour reconstructions have provided new insights into the lives of dinosaurs and other extinct animals, by predicting colouration patterns from fossilised pigment-bearing organelles called melanosomes.
ANGUS D. CROUDACE, CAIZHI SHEN, JUNCHANG LÜ, STEPHEN L. BRUSATTE, JAKOB VINTHER   +4 more
doaj   +1 more source