Results 71 to 80 of about 2,587 (228)

Inside a duck‐billed dinosaur: Vertebral bone microstructure of Huallasaurus (Hadrosauridae), Upper Cretaceous of Patagonia

The Anatomical Record, EarlyView.
Abstract Dinosaurs evolved a unique respiratory system with air sacs that contributed to their evolutionary success. Postcranial skeletal pneumaticity (PSP) has been used to infer the presence of air sac systems in some fossil archosaurs. While unambiguous evidence of PSP is well documented in pterosaurs and post‐Carnian saurischians, it remains absent
Tito Aureliano, Aline M. Ghilardi, Jonatan Kaluza, Agustín G. Martinelli   +3 more
wiley   +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

The cranial anatomy of the neornithischian dinosaur Thescelosaurus neglectus [PDF]

PeerJ, 2014
Though the dinosaur Thescelosaurus neglectus was first described in 1913 and is known from the relatively fossiliferous Lance and Hell Creek formations in the Western Interior Basin of North America, the cranial anatomy of this species remains poorly ...
Clint A. Boyd
doaj   +2 more sources

Macroevolutionary patterns in cranial and lower jaw shape of ceratopsian dinosaurs (dinosauria, ornithischia). phylogeny, morphological integration, and evolutionary rates [PDF]

, 2017
Organisms: Ceratopsians were herbivorous, beaked dinosaurs, ranging from 1 m to 9 m in body length, usually four-footed, and with a bony frill that extended backwards from the cranium over the nape of the neck. Known from Asia, Europe, and North America,
Farke, Aa, Kotsakis, T, Maiorino, L, Piras, P   +3 more
core  

Intraskeletal histovariability and skeletochronology in an ornithopod dinosaur from the Maestrazgo Basin (Teruel, Spain)

Journal of Anatomy, Volume 247, Issue 3-4, Page 643-664, September/October 2025.
Abstract Ornithopods are an extinct group of dinosaurs that were particularly abundant and diverse in the Cretaceous of the Iberian Peninsula, and whose abundance in the Maestrazgo Basin has allowed numerous taxa to be identified over the last decade. Many of these fossil remains are still taxonomically indeterminate and require a more detailed study ...
Juan Maíllo, Jerome Hidalgo‐Sanz, José Manuel Gasca, José Ignacio Canudo, Miguel Moreno‐Azanza   +4 more
wiley   +1 more source

Skull morphology and histology indicate the presence of an unexpected buccal soft tissue structure in dinosaurs

Journal of Anatomy, Volume 247, Issue 3-4, Page 790-818, September/October 2025.
A combined approach of osteology and histology was used to examine the cheek regions of dinosaurs. Strong evidence was found for a soft tissue in this region connecting the zygoma to the mandible, here named the ‘exoparia’. Abstract Unlike mammals, reptiles typically lack large muscles and ligaments that connect the zygoma to the mandible.
Henry S. Sharpe, Yan‐yin Wang, Thomas W. Dudgeon, Mark J. Powers, S. Amber Whitebone, Colton C. Coppock, Aaron D. Dyer, Corwin Sullivan   +7 more
wiley   +1 more source

A new specimen of Valdosaurus canaliculatus (Ornithopoda: Dryosauridae) from the Lower Cretaceous of the Isle of Wight, England [PDF]

, 2016
Memoirs of Museum Victoria is an open access journal.
Barrett, PM
core   +1 more source

A new ornithopod (Dinosauria; Ornithischia) from Antarctica

Cretaceous Research, 2013
Fil: Coria, Rodolfo Anibal. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Centro Cientifico Tecnologico Conicet - Patagonia Norte; Argentina.
Sergio A. Marenssi, Sergio A. Marenssi, Sergio Santillana, Juan J. Moly, Rodolfo A. Coria, Rodolfo A. Coria, Marcelo Alfredo Reguero, Marcelo Alfredo Reguero   +7 more
openaire   +3 more sources

How smart was T. rex? Testing claims of exceptional cognition in dinosaurs and the application of neuron count estimates in palaeontological research

The Anatomical Record, Volume 307, Issue 12, Page 3685-3716, December 2024.
Abstract Recent years have seen increasing scientific interest in whether neuron counts can act as correlates of diverse biological phenomena. Lately, Herculano‐Houzel (2023) argued that fossil endocasts and comparative neurological data from extant sauropsids allow to reconstruct telencephalic neuron counts in Mesozoic dinosaurs and pterosaurs, which ...
Kai R. Caspar, Cristián Gutiérrez‐Ibáñez, Ornella C. Bertrand, Thomas Carr, Jennifer A. D. Colbourne, Arthur Erb, Hady George, Thomas R. Holtz Jr, Darren Naish, Douglas R. Wylie, Grant R. Hurlburt   +10 more
wiley   +1 more source

Dynamics of dental evolution in ornithopod dinosaurs. [PDF]

, 2016
Ornithopods were key herbivorous dinosaurs in Mesozoic terrestrial ecosystems, with a variety of tooth morphologies. Several clades, especially the 'duck-billed' hadrosaurids, became hugely diverse and abundant almost worldwide.
A Osi, A Prieto-Márquez, A Prieto-Márquez, AR Fiorillo, AT McDonald, AT Mcdonald†, B Vila, CW Gilmore, D Bapst, DB Norman, DB Weishampel, DB Weishampel, DC Tank, DE Fastovsky, DJ Gower, GM Erickson, GT Lloyd, GT Lloyd, H You, J Hill, JH Ostrom, JS Tweet, K Takahashi, M Sakamoto, MJ Anderson, MJ Benton, MJ Benton, MJ Hopkins, PA Goloboff, PJ Makovicky, PM Barrett, PM Barrett, PR Bell, PR Bell, PR Crane, RA Close, RJ Butler, RJ Butler, S Zan, SL Brusatte, SL Brusatte   +40 more
core   +1 more source