Results 31 to 40 of about 2,587 (228)
Enamel microstructure and dental histology in a heterodontosaurid dinosaur: Heterodontosaurus tucki [PDF]
Acta Palaeontologica Polonica, 2023 Among non-avian dinosaurs, Heterodontosaurus tucki is unique for possessing complex dental features including both morphological and proportional heterodonty, sub-hypsodonty, tooth occlusion, and extensive low-angled wear facets—a collection of ...
CECILIA E. CALVERT +5 more
doaj +1 more source
Long-horned Ceratopsidae from the Foremost Formation (Campanian) of southern Alberta [PDF]
PeerJ, 2018 The horned Ceratopsidae represent one of the last radiations of dinosaurs, and despite a decade of intense work greatly adding to our understanding of this diversification, their early evolution is still poorly known. Here, two postorbital horncores from
Caleb M. Brown
doaj +2 more sources
Vertebrate Anatomy, Morphology, Palaeontology, 2023 The taxonomic validity of the holotype and sole specimen of the pachycephalosaurid Gravitholus albertae (TMP 1972.027.0001) from the Belly River Group (Alberta, Canada), remains unresolved forty years after its first description.
Aaron Dyer, Mark Powers, Phiip Currie
doaj +1 more source
, 2022 ORNITHISCHIA Seeley, 1888 DESCRIPTION With the exception of thyreophorans, the ornithischian dinosaurs of Angeac-Charente are mainly represented by isolated teeth. Most of these teeth show evidence of pre-burial transport and are either broken or eroded.
Allain, Ronan +12 more
openaire +2 more sources
The systematic relationships and biogeographic history of ornithischian dinosaurs [PDF]
PeerJ, 2015 The systematic relationships of taxa traditionally referred to as ‘basal ornithopods’ or ‘hypsilophodontids’ remain poorly resolved since it was discovered that these taxa are not a monophyletic group, but rather a paraphyletic set of neornithischian ...
Clint A. Boyd
doaj +2 more sources
eLife, 2022 The dental system of ceratopsids is among the most specialized structure in Dinosauria by the presence of tooth batteries and high-angled wear surfaces.
Jinfeng Hu +5 more
doaj +1 more source
The Anatomical Record, Volume 306, Issue 7, Page 1646-1668, July 2023., 2023 Abstract In studying the skeletal allometry of any vertebrate, it is important to sample the ontogenetic extremes to ensure the accuracy of parameter estimation; this is particularly true for fossil taxa, where sampling of ontogenetic series is incomplete and sporadic.
Jordan C. Mallon +3 more
wiley +1 more source
A new phylogeny of Stegosauria (Dinosauria, Ornithischia) [PDF]
Palaeontology, 2017 The stegosaurs are some of the most easily recognizable dinosaurs, but are surprisingly rare as fossils. Consequently much remains unknown about their palaeobiology, and every new stegosaurian find contributes to our understanding of the evolution of the clade.
Raven, Tom, Maidment, Susannah
openaire +4 more sources
Evolution &Development, Volume 25, Issue 3, Page 209-225, May 2023., 2023 We contrast the morphology of calvarial sutures through ontogeny and evolution in iguanodontian dinosaurs to test whether the evolution of cranial crests impacted the mechanical loading of the skull. We found that increased suture complexity coincided with crest evolution, and corresponding modifications to their skull altered stress distribution while
Thomas W. Dudgeon, David C. Evans
wiley +1 more source
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