Results 201 to 210 of about 2,587 (228)

Estimating Ancestral States of Complex Characters: A Case Study on the Evolution of Feathers

Cockx P, Benton MJ, Keating JN.
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El origen de los dinosaurios (Dinosauria: Saurischia - Ornithischia)

, 2012
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Dental assessment of Stegoceras validum (Ornithischia: Pachycephalosauridae) and Thescelosaurus neglectus (Ornithischia: Thescelosauridae): paleoecological inferences

Cretaceous Research, 2022
Abstract Small herbivorous dinosaurs of the clades Pachycephalosauridae and Thescelosauridae occur in multiple Cretaceous formations in North America, their coexistence likely made possible by differences in feeding style. Fossils of these taxa are generally rare, but isolated pachycephalosaurid and thescelosaurid teeth are common at microfossil ...
Corwin Sullivan, Michael Naylor Hudgins, Michael Naylor Hudgins, Philip J. Currie   +3 more
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Phylogeny of the ankylosaurian dinosaurs (Ornithischia: Thyreophora)

Journal of Systematic Palaeontology, 2011
Ankylosauria is a diverse clade of quadrupedal ornithischian dinosaurs whose remains are known from Middle Jurassic to latest Cretaceous sediments worldwide. Despite a long history of research, ankylosaur interrelationships remain poorly resolved and existing cladistic analyses suffer from limited character and taxon sampling. Here, we present the most
Thompson, Richard, Parish, Jolyon, Maidment, Susannah, Barrett, Paul   +3 more
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Systematics and phylogeny of Stegosauria (Dinosauria: Ornithischia)

Journal of Systematic Palaeontology, 2008
Synopsis Stegosauria is a clade of ornithischian dinosaurs characterised by a bizarre array of dermal armour extending, in two parasagittal rows, from the cervical region to the end of the tail. Although Stegosaurus is one of the most familiar of all dinosaurs, little is known regarding the evolutionary history of this clade.
Maidment, Susannah, Norman, David, Barrett, Paul, Upchurch, Paul   +3 more
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A review of pelvic shield morphology in ankylosaurs (Dinosauria: Ornithischia) [PDF]

Journal of Paleontology, 2011
The pelvic shield of ankylosaurian dinosaurs refers to an area of osteoderms lacking differentiated transverse bands over the pelvic region and it is used as a diagnostic character for various ankylosaur groups. The pelvic shield character varies across ankylosaur taxa but is typically coded as a binary character or is excluded from phylogenetic ...
Victoria M. Arbour, Michael E. Burns, Philip J. Currie   +2 more
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A nest ofProtoceratops andrewsi(Dinosauria, Ornithischia)

Journal of Paleontology, 2011
A remarkable specimen of the small neoceratopsian dinosaurProtoceratops andrewsi(Late Cretaceous, Mongolia) reveals the first nest of this genus, complete with fifteen juveniles. The relatively large size of the individuals and their advanced state of development suggests the possibility thatProtoceratopsjuveniles remained and grew in their nests ...
Fastovsky, D. E., Weishampel, D. B., Watabe, M., Barsbold, R., Tsogtbaatar, Kh, Narmandakh, P.   +5 more
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Notes on pachycephalosaurs (Ornithischia)

Journal of Paleontology, 1989
Previously undescribed specimens ofPachycephalosaurus wyomingensisallow partial description of the anterior braincase and a preliminary examination of change of dome shape with age. The two morphs of dome shape recognized in adults are also present in juvenile specimens with dome lengths half that of mature adults.
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The evolution of squamosal shape in ceratopsid dinosaurs (Dinosauria, Ornithischia)

Journal of Vertebrate Paleontology, 2013
ABSTRACT Ceratopsidae represents one of the last and best-known radiations of non-avian dinosaurs. Interspecific variation is well documented qualitatively with linear measurements, but little has been done to quantify shape differences in the frill that may indicate functional or evolutionary signals.
Kevin M. Terris, Tassos Kotsakis, Tassos Kotsakis, Andrew A. Farke, Paolo Piras, Paolo Piras, Michael J. Ryan, Leonardo Maiorino, Leonardo Maiorino   +8 more
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Pachycephalosaur paleoneurology (Archosauria: Ornithischia)

Journal of Vertebrate Paleontology, 1989
ABSTRACT Pachycephalosaur endocranial casts display a distinctive suite of traits that include large divergent olfactory bulbs, large olfactory nerves, short thick olfactory tracts, a moderately expanded cerebrum not separated from optic lobes and cerebellum dorsally, steep cranial flexure, and reduced pontine flexure.
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