Results 91 to 100 of about 226 (117)

Bizarre dermal armour suggests the first African ankylosaur

Nature Ecology & Evolution, 2021
Ankylosauria is a diverse clade of armoured dinosaurs whose members were important constituents of many Cretaceous faunas. Phylogenetic analyses imply that the clade diverged from its sister taxon, Stegosauria, during the late Early Jurassic, but the fossil records of both clades are sparse until the Late Jurassic (~150 million years ago).
Maidment, Susannah C R, Strachan, Sarah J, Ouarhache, Driss, Scheyer, Torsten M, Brown, Emily E, Fernandez, Vincent, Johanson, Zerina, Raven, Thomas J, Barrett, Paul M   +8 more
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Histology of ankylosaur osteoderms: implications for systematics and function

Journal of Vertebrate Paleontology, 2004
ABSTRACT Here, we provide a comparative survey of the histology of postcranial dermal-armor osteoderms of ankylosaurs, including material of polacanthids (Polacanthus foxii, Gastonia sp.), ankylosaurids (e.g., Saichania chulsanensis, Pinacosaurus grangeri, Ankylosauridae indet.), and nodosaurids (e.g., Struthiosaurus austriacus, Nodosauridae indet ...
Torsten M Scheyer, P Martin Sander
exaly   +2 more sources

Nodosaurid Ankylosaur from the Cenomanian of Japan

Journal of Vertebrate Paleontology, 2005
(2005). Nodosaurid Ankylosaur from the Cenomanian of Japan. Journal of Vertebrate Paleontology: Vol. 25, No. 1, pp. 240-245.
Kenneth Carpenter, Makoto Manabe
exaly   +2 more sources

A Nodosaurid Ankylosaur (Dinosauria: Ornithischia) from the Lower Cretaceous of Texas

Journal of Vertebrate Paleontology, 1995
ABSTRACT A partial nodosaurid ankylosaur skeleton from Lower Cretaceous littoral deposits of Texas represents a new genus and species, Texasetes pleurohalio. It is distinguished by a prong-like scapular spine that is directed toward the innermost point of the glenoid, development of a small prespinous fossa, and retention of a splint-like fourth ...
Walter P Coombs
exaly   +2 more sources

Extreme armour in the world’s oldest ankylosaur

Nature
The armoured ankylosaurian dinosaurs are best known from Late Cretaceous Northern Hemisphere ecosystems, but their early evolution in the Early-Middle Jurassic is shrouded in mystery due to a poor fossil record1,2. Spicomellus afer was suggested to be the world's oldest ankylosaur and the first from Africa, but was based on only a single partial rib ...
Susannah C. R. Maidment, Driss Ouarhache, Kawtar Ech-charay, Ahmed Oussou, Khadija Boumir, Abdessalam El Khanchoufi, Alison Park, Luke E. Meade, D. Cary Woodruff, Simon Wills, Mike Smith, Paul M. Barrett, Richard J. Butler   +12 more
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A review of pelvic shield morphology in ankylosaurs (Dinosauria: Ornithischia)

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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New ankylosaur (Thyreophora, ornithischia) remains from the Upper Cretaceous of Patagonia

Journal of South American Earth Sciences, 2019
Abstract Fossil evidences of the presence of ankylosaurian dinosaurs in Gondwana are scarce but consistent, being found in Antarctica, Oceania and South America. In spite that there are no nominated species in South America, the ankylosaur fossil record has increased in the last years.
Murray, Alejandro, Riguetti, Facundo Javier, Rozadilla, Sebastian   +2 more
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A New Nodosaurid Ankylosaur from the Chaochuan Formation of Dongyang, Zhejiang Province, China

Acta Geologica Sinica - English Edition, 2013
Abstract:Dongyangopelta yangyanensis gen. et sp. nov. from the Chaochuan Formation (Albian – Cenomanian) of Dongyang, Zhejiang Province, China is characterized: the convex anterior surface of the first presacral rod centrum strongly inflates laterally and slightly curves posteriorly; the fused pelvic shield composes of larger pebble‐shaped bosses ...
CHEN Rongjun, ZHENG Wenjie, Yoichi AZUMA, Masateru SHIBATA, LOU Tianliang, JIN Qiang, JIN Xingsheng   +6 more
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The Paravertebral Elements of the Australian Ankylosaur Minmi (Reptilia: Ornithischia, Cretaceous)

Neues Jahrbuch Fur Geologie Und Palaontologie - Abhandlungen, 1987
R. E. Molnar, E. Frey
exaly   +2 more sources

External and internal structure of ankylosaur (Dinosauria; Ornithischia) osteoderms

2010
Here I assess the use of osteoderms in systematics with comparative material from fossil and extant tetrapod taxa. Putative differences among three groups (ankylosaurid, nodosaurid, and polacanthid) were evaluated. Archosaur osteoderms have cortices surrounding a cancellous core.
openaire   +1 more source