Results 11 to 20 of about 278 (104)

Temporal range extension and evolution of the chasmosaurine ceratopsid ‘Vagaceratops’ irvinensis (Dinosauria: Ornithischia) in the Upper Cretaceous (Campanian) Dinosaur Park Formation of Alberta

Vertebrate Anatomy, Morphology, Palaeontology, 2019
The Dinosaur Park Formation (DPF) has a diverse assemblage of chasmosaurines currently represented by Chasmosaurus belli, C. russelli, Vagaceratops irvinensis, and Mercuriceratops gemini, and may also include remains possibly referable to Spiclypeus ...
James Alexander Campbell, Michael J. Ryan, Claudia J. Schroder-Adams, Robert B. Holmes, David C. Evans   +4 more
doaj   +4 more sources

A Re-evaluation of the Chasmosaurine Ceratopsid Chasmosaurus (Dinosauria: Ornithischia) from the Upper Cretaceous (Campanian) Dinosaur Park Formation of Western Canada [PDF]

, 2018
The chasmosaurine ceratopsid Chasmosaurus is known from the Upper Cretaceous Dinosaur Park Formation (DPF) of southern Alberta and Saskatchewan. The two species, Chasmosaurus belli and Chasmosaurus russelli, are distinguished by differences in cranial ...
Campbell, James Alexander
openaire   +4 more sources

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

J Anat
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.
Sharpe HS, Wang YY, Dudgeon TW, Powers MJ, Whitebone SA, Coppock CC, Dyer AD, Sullivan C.   +7 more
europepmc   +2 more sources

Males Resemble Females: Re-Evaluating Sexual Dimorphism in Protoceratops andrewsi (Neoceratopsia, Protoceratopsidae). [PDF]

PLoS One, 2015
BACKGROUND: Protoceratops andrewsi (Neoceratopsia, Protoceratopsidae) is a well-known dinosaur from the Upper Cretaceous of Mongolia. Some previous workers hypothesized sexual dimorphism in the cranial shape of this taxon, using qualitative and ...
Maiorino L, Farke AA, Kotsakis T, Piras P.   +3 more
europepmc   +5 more sources

A ceratopsid-dominated tracksite from the Dinosaur Park Formation (Campanian) at Dinosaur Provincial Park, Alberta, Canada. [PDF]

PLoS One
The badlands of Dinosaur Provincial Park (Alberta, Canada) are renowned for the exceptional abundance and diversity of Campanian-aged vertebrate body fossils, especially dinosaurs.
Bell PR, Pickles BJ, Ashby SC, Walker IE, Hurst S, Rampe M, Durkin P, Brown CM.   +7 more
europepmc   +3 more sources

Lokiceratops rangiformis gen. et sp. nov. (Ceratopsidae: Centrosaurinae) from the Campanian Judith River Formation of Montana reveals rapid regional radiations and extreme endemism within centrosaurine dinosaurs. [PDF]

PeerJ
The Late Cretaceous of western North America supported diverse dinosaur assemblages, though understanding patterns of dinosaur diversity, evolution, and extinction has been historically limited by unequal geographic and temporal sampling.
Loewen MA, Sertich JJW, Sampson S, O'Connor JK, Carpenter S, Sisson B, Øhlenschlæger A, Farke AA, Makovicky PJ, Longrich N, Evans DC.   +10 more
europepmc   +3 more sources

A New Centrosaurine Ceratopsid, Machairoceratops cronusi gen et sp. nov., from the Upper Sand Member of the Wahweap Formation (Middle Campanian), Southern Utah. [PDF]

PLoS One, 2016
The Upper Cretaceous (middle-late Campanian) Wahweap Formation of southern Utah contains the oldest diagnostic evidence of ceratopsids (to date, all centrosaurines) in North America, with a number of specimens recovered from throughout a unit that spans ...
Lund EK, O'Connor PM, Loewen MA, Jinnah ZA.   +3 more
europepmc   +5 more sources

“Dragons” on the landscape: Modeling the abundance of large carnivorous dinosaurs of the Upper Jurassic Morrison Formation (USA) and the Upper Cretaceous Dinosaur Park Formation (Canada)

The Anatomical Record, Volume 306, Issue 7, Page 1669-1696, July 2023., 2023
Abstract Counts of the number of skeletal specimens of “adult” megaherbivores and large theropods from the Morrison and Dinosaur Park formations—if not biased by taphonomic artifacts—suggest that the big meat‐eaters were more abundant, relative to the number of big plant‐eaters, than one would expect on the basis of the relative abundance of large ...
James O. Farlow, Dan Coroian, Philip J. Currie, John R. Foster, Jordan C. Mallon, François Therrien   +5 more
wiley   +1 more source

Long-horned Ceratopsidae from the Foremost Formation (Campanian) of southern Alberta. [PDF]

PeerJ, 2018
Brown CM.
europepmc   +3 more sources

The postcranial skeleton of Vagaceratops irvinensis (Dinosauria, Ceratopsidae)

Vertebrate Anatomy, Morphology, Palaeontology, 2014
The postcranial skeleton of Vagaceratops (= Chasmosaurus) irvinensis (CMN 41357), lacking only the tail, most of the left front and left hind limbs, and portions of the pelvis, is preserved in articulation.
Robert B Holmes
doaj   +3 more sources