Results 11 to 20 of about 173 (103)
A subadult specimen of Rubeosaurus ovatus (Dinosauria: Ceratopsidae), with observations on other ceratopsids from the two medicine formation. [PDF]
PLoS ONE, 2011 BackgroundCentrosaurine ceratopsids are well known from the middle Campanian Upper Two Medicine Formation of Montana. Four taxa have been named: Brachyceratops montanensis, Rubeosaurus ovatus, Einiosaurus procurvicornis, and Achelousaurus horneri ...
Andrew T McDonald
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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
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Vertebrate Anatomy, Morphology, Palaeontology, 2020 Styracosaurus albertensis is an iconic centrosaurine horned dinosaur from the Campanian of Alberta, Canada, known for its large spike-like parietal processes.
Caleb Brown +2 more
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Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs: evidence from the Campanian of New Mexico [PDF]
PeerJ, 2020 Three new chasmosaurines from the Kirtland Formation (~75.0–73.4 Ma), New Mexico, form morphological and stratigraphic intermediates between Pentaceratops (~74.7–75 Ma, Fruitland Formation, New Mexico) and Anchiceratops (~72–71 Ma, Horseshoe Canyon ...
Denver W. Fowler +1 more
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The dentary of hadrosauroid dinosaurs: evolution through heterochrony
Palaeontology, Volume 66, Issue 5, September/October 2023., 2023 Abstract The near‐global distribution of hadrosaurid dinosaurs during the Cretaceous has been attributed to mastication, a behaviour commonly recognized as a mammalian adaptation. Its occurrence in a non‐mammalian lineage should be accompanied by the evolution of several morphological modifications associated with food acquisition and processing.
D. Fredrik K. Söderblom +3 more
wiley +1 more source
The structure and relationships of the horned dinosaur Arrhinoceratops Parks(Ornithischia: Ceratopsidae) [PDF]
Canadian Journal of Earth Sciences, 1981 Only the type specimen of Arrhinoceratops brachyops Parks can be assigned without question to the ceratopsid genus Arrhinoceratops. The original description, however, requires revision. Contrary to published accounts, a nasal horn core is present, the jugal cannot be characterized by an unusually long anterior process, and there is no nasal–rostral ...
Jordan C. Mallon +2 more
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The record ofTorosaurus(Ornithischia: Ceratopsidae) in Canada and its taxonomic implications
Zoological Journal of the Linnean Society, 2022 AbstractThe horned dinosaur genus Torosaurus has a challenging history, relating both to its geographic distribution and taxonomy. Whereas Torosaurus has been reported from Upper Maastrichtian deposits in Canada, which would mark the northernmost range of the genus, recent work has questioned the generic identity of the implicated material, which ...
Mallon, Jordan C. +3 more
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Mountain building triggered late cretaceous North American megaherbivore dinosaur radiation.
PLoS ONE, 2012 Prior studies of Mesozoic biodiversity document a diversity peak for dinosaur species in the Campanian stage of the Late Cretaceous, yet have failed to provide explicit causal mechanisms.
Terry A Gates +2 more
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Nasutoceratops titusi (Ornithischia, Ceratopsidae), a basal centrosaurine ceratopsid from the Kaiparowits Formation, southern Utah [PDF]
Journal of Vertebrate Paleontology, 2016 The skull and associated postcrania of Nasutoceratops titusi, a basal centrosaurine ceratopsid from the Upper Cretaceous (Campanian) Kaiparowits Formation of Grand Staircase–Escalante National Monument, southern Utah, are herein described. Autapomorphies of this taxon include: an ectonaris that comprises 75% of preorbital skull length; pneumatic nasals;
K. Lund, Eric +2 more
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, 2002 Family CERATOPSIDAE Three genera of neoceratopsians are known from the Maastrichtian of the Western Interior: Triceratops, Diceratops, and Torosaurus (Forster, 1996; however, see Lehman, 1987). In addition, Triceratops is represented by two species: T. horridus and T. porosus.
Kenneth Carpenter, D. Bruce Young
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