Results 51 to 60 of about 1,052 (177)

A new Heterodontosaurus specimen elucidates the unique ventilatory macroevolution of ornithischian dinosaurs

eLife, 2021
Ornithischian dinosaurs were ecologically prominent herbivores of the Mesozoic Era that achieved a global distribution by the onset of the Cretaceous. The ornithischian body plan is aberrant relative to other ornithodiran clades, and crucial details of ...
Viktor J Radermacher, Vincent Fernandez, Emma R Schachner, Richard J Butler, Emese M Bordy, Michael Naylor Hudgins, William J de Klerk, Kimberley EJ Chapelle, Jonah N Choiniere   +8 more
doaj   +1 more source

Ecology of reintroduced Rocky Mountain bighorn sheep in Dinosaur National Monument La Ecología de Borrego Cimarron de las Montañas Rocosas Reintroducido en el Monumento Nacional de Dinosaurio

Wildlife Monographs, Volume 223, Issue 1, August 2026.
We synthesized GPS telemetry, genetic, and pathogen data to evaluate metapopulation processes in a reintroduced Rocky Mountain bighorn sheep (Ovis canadensis canadensis) population in Dinosaur National Monument. We estimated subpopulation‐specific abundances and found 4 small subpopulations with high genetic diversity, partial connectivity, and ...
Sarah L. Carroll, Elizabeth P. Flesch, Salix R. Scoresby, Emily Spencer, Rachel S. Crowhurst, Clinton W. Epps, Nathan L. Galloway, William M. Janousek, Tabitha A. Graves   +8 more
wiley   +1 more source

Delapparentia turolensis nov. gen et sp., un nuevo dinosaurio iguanodontoideo (Ornithischia: Ornithopoda) en el Cretácico Inferior de Galve

Estudios Geologicos, 2011
Se redescribe un esqueleto postcraneal de dinosaurio ornitópodo asignado por Albert de Lapparent en 1960 a Iguanodon bernissartensis. Procede del yacimiento de La Maca 3, de edad Barremiense inferior (Formación Camarillas), y consta de varias vértebras ...
J. I. Ruiz-Omeñaca
doaj   +1 more source

Description of the skull, braincase, and dentition of Moschognathus whaitsi (Dinocephalia, Tapinocephalia), and its palaeobiological and behavioral implications

The Anatomical Record, Volume 309, Issue 7, Page 1713-1748, July 2026.
Abstract A subadult Moschognathus whaitsi from the Eastern Cape Province, South Africa, was scanned using synchrotron radiation X‐ray computed tomography (SRXCT). Its subadult state allowed the cranial bones and teeth to be identified and individually reconstructed in 3D.
Tristen Lafferty, Luke A. Norton, Aliénor Duhamel, Julien Benoit   +3 more
wiley   +1 more source

A well-preserved vertebra provides new insights into rebbachisaurid sauropod caudal anatomical and pneumatic features [PDF]

Acta Palaeontologica Polonica
Rebbachisauridae is a clade of sauropod dinosaurs whose maximum diversification and abundance are known from the Cretaceous of South America. We describe an anterior caudal vertebra, MDPA-Pv 007, from the Upper Cretaceous of Argentine Patagonia, whose ...
GUILLERMO J. WINDHOLZ, JUAN D. PORFIRI, DOMENICA DOS SANTOS, FLAVIO BELLARDINI, MATHEW J. WEDEL   +4 more
doaj   +1 more source

A re-evaluation of the enigmatic dinosauriform Caseosaurus crosbyensis from the Late Triassic of Texas, USA and its implications for early dinosaur evolution [PDF]

Acta Palaeontologica Polonica, 2018
The holotype specimen of the Late Triassic dinosauriform Caseosaurus crosbyensis is redescribed and evaluated phylogenetically for the first time, providing new anatomical information and data on the earliest dinosaurs and their evolution within the ...
Matthew G. Baron, Megan E. Williams
doaj   +1 more source

Inner Ear Anatomy of Caenagnathidae (Theropoda: Oviraptorosauria) Emphasizes Mosaic Evolution of the Avian Neurosensory System

Journal of Comparative Neurology, Volume 534, Issue 7, July 2026.
The phylogenetic position of oviraptorosaurs close to birds makes them a key group for understanding the acquisition of avian senses. Here, we describe the first inner ear endocasts for caenagnathids, a major subclade of oviraptorosaurs, which demonstrates that labyrinth morphology varied more than expected within oviraptorosaurs.
Kayla D. Bazzana‐Adams, Gregory F. Funston, David C. Evans   +2 more
wiley   +1 more source

Dinosauria Owen 1842

, 1992
Dinosaurs The dinosaur faunas of the Fruitland and Kirtland Formations were first described in detail by Gilmore (1916), who based his study on specimens collected by Bauer and Reeside. Subsequently, the collections of Charles Sternberg were described by Wiman(1930, 1931, 1932, 1933), Osborn (1923), Gilmore (1935) and Ostrom (1960, 1961).
Hunt, A. P., Lucas, S. G.
openaire   +2 more sources

Mammalian Osteoderm Ultrastructure in the Armored Acomys Spiny Mouse Tail

Small, Volume 22, Issue 40, 17 July 2026.
The ultrastructure of armored platelets – termed osteoderms – in the tail skin of Acomys cahirinus spiny mice is characterized using 2D and 3D microscopy methods. The imbricated structure is composed of calcium phosphate biomineral and has select structural elements that are bone‐like and tooth‐like in nature.
Joseph Deering, Malcolm Maden, Marc D. McKee   +2 more
wiley   +1 more source

Anatomical network analysis of sauropodomorph cranial topology

Palaeontology, Volume 69, Issue 4, July/August 2026.
Abstract The cranium of sauropodomorph dinosaurs is relatively small and diverse in shape. However, the cranial topology of sauropodomorphs has not previously been investigated. The distinct pattern of physical interactions (joints) among the elements (bones) of an anatomical system (cranium) reveals information about its morphology, leading to a ...
Tim Schuurman, Emiliano Bruner, Fabien Knoll   +2 more
wiley   +1 more source