Results 71 to 80 of about 2,200 (200)

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

The appendicular myology of Stegoceras validum (Ornithischia: Pachycephalosauridae) and implications for the head-butting hypothesis.

PLoS ONE, 2022
In this study, we use an exceptional skeleton of the pachycephalosaur Stegoceras validum (UALVP 2) to inform a comprehensive appendicular muscle reconstruction of the animal, with the goal of better understanding the functional morphology of the ...
Bryan R S Moore, Mathew J Roloson, Philip J Currie, Michael J Ryan, R Timothy Patterson, Jordan C Mallon   +5 more
doaj   +1 more source

The origins of neural spine elongation in iguanodontian dinosaurs and the osteology of a new sail‐back styracosternan (Dinosauria, Ornithischia) from the Lower Cretaceous Wealden Group of England

Papers in Palaeontology, Volume 11, Issue 4, July/August 2025.
Abstract The Wealden Group of southern England was deposited during the late Berriasian to early Aptian interval. It records a critical time in the development of iguanodontian dinosaur diversity, which increased from low levels during the Jurassic to higher levels in the Aptian and Albian. A new iguanodontian dinosaur, Istiorachis macarthurae gen.
Jeremy A. F. Lockwood, David M. Martill, Susannah C. R. Maidment   +2 more
wiley   +1 more source

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   +2 more sources

Digital reconstruction of the mandible of an adult Lesothosaurus diagnosticus with insight into the tooth replacement process and diet [PDF]

PeerJ, 2017
Fragmentary caudal ends of the left and right mandible assigned to Lesothosaurus diagnosticus, an early ornithischian, was recently discovered in the continental red bed succession of the upper Elliot Formation (Lower Jurassic) at Likhoele Mountain ...
Lara Sciscio, Fabien Knoll, Emese M. Bordy, Michiel O. de Kock, Ragna Redelstorff   +4 more
doaj   +2 more sources

A new semi‐fossorial thescelosaurine dinosaur from the Cenomanian‐age Mussentuchit Member of the Cedar Mountain Formation, Utah

The Anatomical Record, Volume 307, Issue 12, Page 3717-3781, December 2024.
Abstract Thescelosaurines are a group of early diverging, ornithischian dinosaurs notable for their conservative bauplans and mosaic of primitive features. Although abundant within the latest Cretaceous ecosystems of North America, their record is poor to absent in earlier assemblages, leaving a large gap in our understanding of their evolution ...
Haviv M. Avrahami, Peter J. Makovicky, Ryan T. Tucker, Lindsay E. Zanno   +3 more
wiley   +1 more source

Ornithischia Seeley 1887

, 2003
Ornithischia Seeley, 1887 Included taxa. Lesothosaurus, Technosaurus, Pisanosaurus, Thyreophora, Ornithopoda, and Marginocephalia, and all dinosaurs that are more closely related to these taxa than to saurischians. Temporal range. Camian-Maastrichtian. Distribution. Global. Diagnosis.
openaire   +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.
Coria, Rodolfo Anibal, Moly, Juan J., Reguero, Marcelo Alfredo, Santillana, Sergio, Marenssi, Sergio Alfredo   +4 more
openaire   +2 more sources

Body size distribution of the dinosaurs. [PDF]

PLoS ONE, 2012
The distribution of species body size is critically important for determining resource use within a group or clade. It is widely known that non-avian dinosaurs were the largest creatures to roam the Earth.
Eoin J O'Gorman, David W E Hone
doaj   +1 more source