A Re-Evaluation of the Chasmosaurine Ceratopsid Genus Chasmosaurus (Dinosauria: Ornithischia) from the Upper Cretaceous (Campanian) Dinosaur Park Formation of Western Canada [PDF]
PLoS ONE, 2016 BACKGROUND:The chasmosaurine ceratopsid Chasmosaurus is known from the Upper Cretaceous (Campanian) Dinosaur Park Formation of southern Alberta and Saskatchewan. Two valid species, Chasmosaurus belli and C. russelli, have been diagnosed by differences in
Michael J Ryan
exaly +6 more sources
New insights into chasmosaurine (Dinosauria: Ceratopsidae) skulls from the Upper Cretaceous (Campanian) of Alberta, and an update on the distribution of accessory frill fenestrae in Chasmosaurinae [PDF]
PeerJ, 2018 Chasmosaurine ceratopsids are well documented from the Upper Cretaceous (Campanian) Dinosaur Park Formation (DPF) of southern Alberta and Saskatchewan, and include Chasmosaurus belli, Chasmosaurus russelli, Mercuriceratops gemini, Vagaceratops irvinensis,
James A. Campbell +4 more
doaj +6 more sources
Modularity and heterochrony in the evolution of the ceratopsian dinosaur frill. [PDF]
Ecol Evol, 2020 We find support for peramorphic evolution of the frill of ceratopsian dinosaurs, likely facilitated by the decoupling of this structure from jaw musculature. Abstract The fossil record provides compelling examples of heterochrony at macroevolutionary scales such as the peramorphic giant antlers of the Irish elk.
Prieto-Márquez A +4 more
europepmc +5 more sources
Epidermal scale growth, allometry and function in non‐avian dinosaurs and extant reptiles [PDF]
Journal of AnatomyScale 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 J Enriquez
exaly +3 more sources
The exquisitely preserved integument of Psittacosaurus and the scaly skin of ceratopsian dinosaurs. [PDF]
Commun Biol, 2022 The Frankfurt specimen of the early-branching ceratopsian dinosaur Psittacosaurus is remarkable for the exquisite preservation of squamous (scaly) skin and other soft tissues that cover almost its entire body.
Bell PR +4 more
europepmc +7 more sources
Comments and corrections on 3D modeling studies of locomotor muscle moment arms in archosaurs. [PDF]
PeerJ, 2015 © 2015 Bates et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is ...
Bates K +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
New horned dinosaurs from Utah provide evidence for intracontinental dinosaur endemism. [PDF]
PLoS ONE, 2010 BackgroundDuring much of the Late Cretaceous, a shallow, epeiric sea divided North America into eastern and western landmasses. The western landmass, known as Laramidia, although diminutive in size, witnessed a major evolutionary radiation of dinosaurs ...
Scott D Sampson +6 more
doaj +2 more sources
New perspectives on body size and shape evolution in dinosaurs. [PDF]
Biol Rev Camb Philos SocABSTRACT Diversity in the body shapes and sizes of dinosaurs was foundational to their widespread success during the Mesozoic era. The ability to quantify body size and form reliably is therefore critical to the study of dinosaur biology and evolution.
Dempsey M +4 more
europepmc +2 more sources
A Reevaluation of Sexual Dimorphism in the Postcranium of the Chasmosaurine Ceratopsid <em>Chasmosaurus belli</em> (Dinosauria: Ornithischia) [PDF]
The Canadian Field-Naturalist, 2006 The sexual dimorphism attributed to Chasmosaurus belli by Sternberg (1927) is revisited and reevaluated. A reexamination of the two specimens originally considered by Sternberg reveals that they are less complete than first suggested, with only a moderate amount of overlapping material between them.
Jordan C. Mallon, Robert B. Holmes
openaire +4 more sources