Results 31 to 40 of about 183 (111)
Evolution; international journal of organic evolution, 2016 The anterior cervical vertebrae form the skeletal connection between the cranial and postcranial skeletons in higher tetrapods. As a result, the morphology of the atlas-axis complex is likely to be shaped by selection pressures acting on either the head or neck.
VanBuren, Collin S. +2 more
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Palaeontology, 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
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Two new Ceratopsia from the Laramie of Converse County, Wyoming [PDF]
American Journal of Science, 1905 n ...
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The 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
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Journal 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
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Palaeontology, Volume 67, Issue 1, January/February 2024.Abstract Adaptation to specialist ecological niches is a key innovation that has contributed to the evolutionary success of many vertebrate clades, underpinning the acquisition of diverse skull morphologies. Dinosaurs, which dominated Mesozoic terrestrial faunas, acquired herbivory multiple times, and evolution of these herbivorous adaptations is ...
Callum Kunz, Manabu Sakamoto
wiley +1 more source
Growth curve of Psittacosaurus mongoliensis Osborn (Ceratopsia: Psittacosauridae) inferred from long bone histology [PDF]
Zoological Journal of the Linnean Society, 2000 Abstract The skeleton undergoes substantial histological modification during ontogeny in association with longitudinal growth, shape changes, reproductive activity, and fatigue repair. This variation can hinder attempts to reconstruct life history attributes for individuals, particularly when only fossil materials are availble for study. Histological
GREGORY M. ERICKSON, TATYANA A. TUMANOVA
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Historical BiologyArchaeoceratops oshimai Dong & Azuma, 1997, is a representative early-diverging neoceratopsian dinosaur excavated from the Lower Cretaceous Xinminpu Group in the Mazongshan area of Gansu Province, China. As one of the basal members, it plays a critical role in understanding the origin and early evolution of horned dinosaurs.
Yan-Chao Wang +2 more
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Histologic Examination of an Assemblage of Psittacosaurus (Dinosauria: Ceratopsia) Juveniles From the Yixian Formation (Liaoning, China) [PDF]
The Anatomical Record, 2016 ABSTRACTPsittacosaurus is one of the most abundant dinosaurs known, which allows for extensive study of its growth and form. Previous studies have evaluated growth trajectories of Psittacosaurus using bone histology. However, we present the first study of Psittacosaurus comparative juvenile histology and describe the histology of Psittacosaurus within ...
Zhao, Bo +6 more
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The phylogenetic nomenclature of ornithischian dinosaurs. [PDF]
PeerJ, 2021 Madzia D +5 more
europepmc +1 more source