Results 81 to 90 of about 5,330 (201)

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

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

The 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 ...
Hai-Lu You, Peter Dodson, Barbara S. Grandstaff, Kyo Tanoue   +3 more
openaire   +3 more sources

Discrete and continuous character-based disparity analyses converge to the same macroevolutionary signa. A case study from captorhinids [PDF]

, 2017
The relationship between diversity and disparity during the evolutionary history of a clade provides unique insights into evolutionary radiations and the biological response to bottlenecks and to extinctions.
Brocklehurst, Neil, Fröbisch, Jörg, Romano, Marco   +2 more
core   +2 more sources

Palaeobiology and osteohistology of South African sauropodomorph dinosaurs

Journal of Anatomy, Volume 247, Issue 3-4, Page 712-727, September/October 2025.
We found that the transitionary Sauropodiformes show both the traits of rapid growth of derived Sauropoda as well as interrupted growth of early branching Sauropodomorpha. There appears to be much more variation in growth dynamics of Sauropodiformes than initially thought.
Fay‐yaad Toefy, Emil Krupandan, Anusuya Chinsamy   +2 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

The muscle-powered bite of Allosaurus (Dinosauria; Theropoda): an interpretation of cranio-dental morphology

Estudios Geologicos, 2003
La morfología craneal de Allosaurus ha sido objeto de interpretaciones funcionales que implican un comportamiento depredador radicalmente distinto para el inferido para cualquier vertebrado depredador terrestre.
M. Antón, M. Sánchez, M. J. Salesa, A. Turner   +3 more
doaj   +1 more source

Epidermal scale growth, allometry and function in non‐avian dinosaurs and extant reptiles

Journal of Anatomy, Volume 247, Issue 2, Page 250-283, August 2025.
Scale shapes in non‐avian dinosaurs and extant reptiles are mostly retained through growth. However, positive scale allometry and proportional differences in scale breadth are also detected, which are likely associated with changing body proportions. Based on their generally conserved morphology and impracticality for visual display, the enlarged size ...
Nathan James Enriquez, Nicolás E. Campione, Christophe Hendrickx, Phil R. Bell   +3 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

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 femoral morphology informs our understanding of the evolution of ornithopod locomotion and body size

Palaeontology, Volume 68, Issue 4, July/August 2025.
Abstract Ornithopoda is one of the three main ornithischian dinosaur clades in which secondary quadrupedality is represented. However, when it evolved from obligate bipedality remains controversial. Indeed, the ability to alternate between the two habits was inferred in some ornithopods based on ichnological observations and a mosaic of bipedal and ...
Romain Pintore, Alexandra Houssaye, John R. Hutchinson   +2 more
wiley   +1 more source