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
doaj +5 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 +5 more sources
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
doaj +5 more sources
Mountain building triggered late cretaceous North American megaherbivore dinosaur radiation. [PDF]
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
doaj +2 more sources
Limb-bone scaling indicates diverse stance and gait in quadrupedal ornithischian dinosaurs. [PDF]
PLoS One, 2012 Background The most primitive ornithischian dinosaurs were small bipeds, but quadrupedality evolved three times independently in the clade. The transition to quadrupedality from bipedal ancestors is rare in the history of terrestrial vertebrate ...
Maidment SC +3 more
europepmc +8 more sources
The phylogenetic nomenclature of ornithischian dinosaurs. [PDF]
PeerJ, 2021 Ornithischians form a large clade of globally distributed Mesozoic dinosaurs, and represent one of their three major radiations. Throughout their evolutionary history, exceeding 134 million years, ornithischians evolved considerable morphological ...
Madzia D +5 more
europepmc +4 more sources
Dinosaurs in decline tens of millions of years before their final extinction. [PDF]
Proc Natl Acad Sci U S A, 2016 Whether dinosaurs were in a long-term decline or whether they were reigning strong right up to their final disappearance at the Cretaceous–Paleogene (K-Pg) mass extinction event 66 Mya has been debated for decades with no clear resolution.
Sakamoto M, Benton MJ, Venditti C.
europepmc +4 more sources
Strong support for a heterogeneous speciation decline model in Dinosauria: a response to claims made by Bonsor et al. (2020). [PDF]
R Soc Open Sci, 2021 Through phylogenetic modelling, we previously presented strong support for diversification decline in the three major subclades of dinosaurs (Sakamoto et al. 2016 Proc. Natl Acad. Sci. USA113, 5036–5040. (doi:10.1073/pnas.1521478113)).
Sakamoto M, Benton MJ, Venditti C.
europepmc +5 more sources
Histological and chemical diagnosis of a combat lesion in Triceratops. [PDF]
Sci Rep, 2022 In the collective imagination derived from scientific and popular literature, Triceratops often faced each other in combat. Thus, from the second half of the twentieth century, these ceratopsids were described as pugnacious animals. This arises primarily
D'Anastasio R +5 more
europepmc +3 more sources
Ecological niche modelling does not support climatically-driven dinosaur diversity decline before the Cretaceous/Paleogene mass extinction. [PDF]
Nat Commun, 2019 Chiarenza AA +6 more
europepmc +4 more sources