Results 51 to 60 of about 282 (148)

Novel report of an osteogenic tumor in a late Jurassic Mamenchisaurid from Thailand

open access: yesJournal of Anatomy, Volume 247, Issue 3-4, Page 699-711, September/October 2025.
Here we describe a pathology in an ulna of a Late Jurassic mamenchisaurid from Thailand. We use anatomical descriptions, CT scanning, and bone histology to identify the pathology as an osteogenic tumor. Abstract Here we report on an osseous abnormality and multiple fractures in an ulna of a subadult basal Eusauropod (Mamenchisauridae) from the Late ...
Siripat Kaikaew   +2 more
wiley   +1 more source

How femoral morphology informs our understanding of the evolution of ornithopod locomotion and body size

open access: yesPalaeontology, Volume 68, Issue 4, July/August 2025.
Abstract Ornithopoda is one of the three main ornithischian dinosaur clades in which secondary quadrupedality is represented. However, when it evolved from obligate bipedality remains controversial. Indeed, the ability to alternate between the two habits was inferred in some ornithopods based on ichnological observations and a mosaic of bipedal and ...
Romain Pintore   +2 more
wiley   +1 more source

Review of osteoderm function and future research directions

open access: yesJournal of Zoology, Volume 325, Issue 1, Page 1-24, January 2025.
Osteoderms are bone plates in the skin that occur in virtually all major tetrapod clades. Much has been speculated about their function, but many questions remain unanswered. This review provides an overview of the current state of knowledge and future research directions in this field.
R. Ebel   +3 more
wiley   +1 more source

A new semi‐fossorial thescelosaurine dinosaur from the Cenomanian‐age Mussentuchit Member of the Cedar Mountain Formation, Utah

open access: yesThe Anatomical Record, Volume 307, Issue 12, Page 3717-3781, December 2024.
Abstract Thescelosaurines are a group of early diverging, ornithischian dinosaurs notable for their conservative bauplans and mosaic of primitive features. Although abundant within the latest Cretaceous ecosystems of North America, their record is poor to absent in earlier assemblages, leaving a large gap in our understanding of their evolution ...
Haviv M. Avrahami   +3 more
wiley   +1 more source

A proxy for brain‐to‐endocranial cavity index in non‐neornithean dinosaurs and other extinct archosaurs

open access: yesJournal of Comparative Neurology, Volume 532, Issue 3, March 2024.
Illustration of the endocranial doming, which can provide a proxy for the brain‐to‐endocranial cavity index, using the endocast of an adult of the iguanodont dinosaur Proa valdearinnoensis as an example. Abstract Although the brain fills nearly the entire cranial cavity in birds, it can occupy a small portion of it in crocodilians.
Fabien Knoll   +2 more
wiley   +1 more source

MIRAGAIA TAIL BIOMECHANICS AND DEFENCES. EVALUATION OF THE TAIL MOBILITY AND RESISTANCE TO LOADINGS AND COLLISIONS.

open access: yesRivista Italiana di Paleontologia e Stratigrafia
Thyreophora is a taxon of dinosaurs composed of Stegosauria and Ankylosauria, whose members have been known to utilise their tails as powerful defensive weapons.
Francesco Lategano   +2 more
doaj   +1 more source

Observations on the osteology of scutellosaurus lawleri Colbert, 1981 (Ornithischia: Thyreophora) on the basis on new specimens from the Lower Jurassic Kayenta Formation of Arizona

open access: yes, 2016
Scutellosaurus lawleri is a basal thyreophoran dinosaur from the Lower Jurassic Kayenta Formation, and it is the most abundantly known ornithischian dinosaur from the Lower Jurassic of North America.
Breeden, Benjamin Thomas, III
core   +1 more source

Figure 6 in Taxonomic, palaeobiological and evolutionary implications of a phylogenetic hypothesis for Ornithischia (Archosauria: Dinosauria)

open access: yes, 2022
Figure 6. Strict consensus tree from the unconstrained analysis depicting node numbers mentioned in the text and bootstrap values equal to or higher than 40%.
Norman, David B   +3 more
core   +1 more source

New stegosaurian (Ornithischia, Thyreophora) remains from Jurassic-Cretaceous transition beds of Valencia province (Southwestern Iberian Range, Spain)

open access: yesJournal of Iberian Geology, 2010
The authors are very grateful to Marcal Joanes-Roses and Gabriel Sanz who found the specimens. Field works were supported by Generalitat Valenciana and La Yesa City Council. This research was supported by the Ministerio de Ciencia e Innovacion (MICINN, projects CGL2007-62469/BTE and CGL2007-64061/BTE; JIR-O and XPS), the Gobierno Vasco/EJ (GIC07/14-361;
Company Rodríguez, Julio   +2 more
openaire   +3 more sources

Ankylosaurid (Dinosauria: Thyreophora) osteoderms from the Upper Cretaceous Cerro del Pueblo Formation of Coahuila, Mexico

open access: yesCarnets de Géologie, 2006
Ankylosaurian dinosaur osteoderms have been discovered in the southeastern part of the State of Coahuila, Mexico, in the township of General Cepeda, in the locality known as El Palmar.
Rivera-Sylva Héctor E.   +1 more
doaj  

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