Results 11 to 20 of about 287 (148)

Calvarial suture interdigitation in hadrosaurids (Ornithischia: Ornithopoda): Perspectives through ontogeny and evolution

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   +3 more sources

A new saurolophine hadrosaurid (Dinosauria: Ornithopoda) from the Upper Cretaceous of Shandong, China [PDF]

Anais da Academia Brasileira de Ciências, 2017
A new saurolophine hadrosaurid, Laiyangosaurus youngi gen. et sp. nov. is described and phylogenetically analyzed based on several cranial elements from the Jingangkou Formation, Wangshi Group, Upper Cretaceous of Laiyang, Shandong, China. Laiyangosaurus
JIALIANG ZHANG, XIAOLIN WANG, QIANG WANG, SHUNXING JIANG, XIN CHENG, NING LI, RUI QIU   +6 more
doaj   +5 more sources

First population analysis in Hadrosauroid dinosaurs (Ornithopoda: Iguanodontia: Hadrosauroidea)

Evolving Earth
The study of biological population densities through direct measurements is one of the pillars of modern ecology; however, it does not apply to extinct fauna without modern extant representatives, as is the case with non-avian, plant-eating dinosaurs ...
Francisco Javier Jiménez-Moreno, Angel Alejandro Ramírez-Velasco, Patricio Ocampo-Cornejo, Jorge Velázquez-Castro, Rodolfo Palomino-Merino   +4 more
doaj   +2 more sources

A New Sail-Backed Styracosternan (Dinosauria: Ornithopoda) from the Early Cretaceous of Morella, Spain.

PLoS ONE, 2015
A new styracosternan ornithopod genus and species is here described based on a partial postcranial skeleton and an associated dentary tooth of a single specimen from the Arcillas de Morella Formation (Early Cretaceous, late Barremian) at the Morella ...
José Miguel Gasulla, Fernando Escaso, Iván Narváez, Francisco Ortega, José Luis Sanz   +4 more
doaj   +5 more sources

A new hadrosauroid (Dinosauria: Ornithopoda) from the Late Cretaceous Baynshire Formation of the Gobi Desert (Mongolia).

PLoS ONE, 2019
A new genus and species of non-hadrosaurid hadrosauroid, Gobihadros mongoliensis, is described from a virtually complete and undeformed skull and postcranial skeleton, as well as extensive referred material, collected from the Baynshire Formation ...
Khishigjav Tsogtbaatar, David B Weishampel, David C Evans, Mahito Watabe   +3 more
doaj   +3 more sources

Skull morphology and histology indicate the presence of an unexpected buccal soft tissue structure in dinosaurs. [PDF]

J Anat
A combined approach of osteology and histology was used to examine the cheek regions of dinosaurs. Strong evidence was found for a soft tissue in this region connecting the zygoma to the mandible, here named the ‘exoparia’. Abstract Unlike mammals, reptiles typically lack large muscles and ligaments that connect the zygoma to the mandible.
Sharpe HS, Wang YY, Dudgeon TW, Powers MJ, Whitebone SA, Coppock CC, Dyer AD, Sullivan C.   +7 more
europepmc   +2 more sources

Intraskeletal histovariability and skeletochronology in an ornithopod dinosaur from the Maestrazgo Basin (Teruel, Spain). [PDF]

J Anat
Abstract Ornithopods are an extinct group of dinosaurs that were particularly abundant and diverse in the Cretaceous of the Iberian Peninsula, and whose abundance in the Maestrazgo Basin has allowed numerous taxa to be identified over the last decade. Many of these fossil remains are still taxonomically indeterminate and require a more detailed study ...
Maíllo J, Hidalgo-Sanz J, Gasca JM, Canudo JI, Moreno-Azanza M.   +4 more
europepmc   +2 more sources

New perspectives on body size and shape evolution in dinosaurs. [PDF]

Biol Rev Camb Philos Soc
ABSTRACT Diversity in the body shapes and sizes of dinosaurs was foundational to their widespread success during the Mesozoic era. The ability to quantify body size and form reliably is therefore critical to the study of dinosaur biology and evolution.
Dempsey M, Cross SRR, Maidment SCR, Hutchinson JR, Bates KT.   +4 more
europepmc   +2 more sources

Carex ornithopoda subsp. ornithopoda

, 2023
34.1. Carex ornithopoda subsp. ornithopoda 35 (48). Carex pediformis C.A.Mey., Mém. Acad. Imp. Sci. St. - Pétersbourg Divers Savans 1: 219 (1831). 35.1. Carex pediformis var. pediformis 36 (49). Carex rhizina Blytt ex Lindblom, Bot. Not. 1839 (8): 98 (1839).— Carex rhizodes Blytt ex Boott, Ill. Gen.
Danylyk, Ivan M., Koopman, Jacob
openaire   +2 more sources

Description and etiology of paleopathological lesions in the type specimen of Parasaurolophus walkeri (Dinosauria: Hadrosauridae), with proposed reconstructions of the nuchal ligament. [PDF]

J Anat, 2020
The fossilized lesions in Parasaurolophus walkeri comprise periodontal disease, fractured ribs, and myositis ossificans traumatica in a number of vertebral dorsal spines and in the ilium. The injuries appear to have been caused by one or more non‐threatening events. The discoidal overgrowth on the dorsal spines m ight represent a pathological correlate
Bertozzo F, Manucci F, Dempsey M, Tanke DH, Evans DC, Ruffell A, Murphy E.   +6 more
europepmc   +2 more sources