Hadrosauridae — LLMpedia

Hadrosauridae
David Ceballos from Madrid, España · CC BY 2.0 · source
Name	Hadrosauridae
Fossil range	Late Cretaceous
Taxon	Family
Subdivision ranks	Subfamilies

Contents

Hadrosauridae Hadrosauridae were a diverse family of ornithopod dinosaurs prominent during the Late Cretaceous, known for their broad, flattened snouts and complex dental batteries. Paleontologists study Hadrosauridae through fossils from formations, museums, and field expeditions associated with institutions such as the American Museum of Natural History, Royal Tyrrell Museum, Natural History Museum, London, Smithsonian Institution, and Canadian Museum of Nature. Their evolutionary significance links to research by figures connected to Othniel Charles Marsh, Edward Drinker Cope, Barnum Brown, John Ostrom, and Jack Horner.

Description and anatomy

Hadrosaurid skeletons show a combination of characters preserved in specimens housed at the Field Museum, Royal Ontario Museum, Museo Nacional de Ciencias Naturales, Yale Peabody Museum, and Beijing Museum of Natural History. Skulls exhibit laterally expanded rostra, with crests in many taxa described in publications from the Proceedings of the Royal Society, Journal of Vertebrate Paleontology, Nature (journal), Science (journal), and the Cretaceous Research community. Dentition formed complex dental batteries involving dozens of tightly packed teeth, analogous in function discussions found in studies associated with Edward Buffetaut, David Norman, Philip J. Currie, Michael J. Ryan, and Richard F. Thulborn. Forelimb and hindlimb proportions, preserved in specimens curated by the University of California Museum of Paleontology and the Royal Belgian Institute of Natural Sciences, indicate facultative quadrupedality discussed in conferences at the Society of Vertebrate Paleontology and in works by researchers linked to Columbia University, University of Toronto, Montana State University, and University of Utah.

Hadrosaurid taxonomy has been revised in systematic analyses published by authors associated with American Museum of Natural History, Carnegie Museum of Natural History, University of Alberta, Yale University, and University of Chicago. Subfamilies traditionally recognized are treated in cladistic matrices deposited in institutions like the Natural History Museum of Los Angeles County and cited by teams including Lida Xing, Dong Zhiming, Xu Xing, Hans-Dieter Sues, and Peter Dodson. Phylogenetic relationships connect hadrosaurids to earlier ornithopods cataloged in the British Museum (Natural History), with divergence times discussed at symposia of the Paleontological Society and in molecular-clock comparative frameworks referenced by scholars from Harvard University and Princeton University. Biogeographic patterns relate to tectonic and faunal interchange events involving regions studied by the United States Geological Survey, Geological Survey of Canada, Instituto Geológico y Minero de España, Chinese Academy of Sciences, and the Argentine Museum of Natural Sciences.

Fossils attributed to this family are abundant in formations and collections at the Hell Creek Formation, Judith River Formation, Dinosaur Park Formation, Nemegt Formation, and Iren Dabasu Formation, with specimens accessioned by the Royal Tyrrell Museum, Burke Museum, National Museum of Natural History (France), Museo del Carmen de Patagones, and the National Museum of Natural Science (Taiwan). Geographic distribution spans continents documented in reports from teams funded by the National Science Foundation, Natural Sciences and Engineering Research Council, National Natural Science Foundation of China, and the European Research Council. Taphonomic studies published by researchers affiliated with Stanford University, University of Bologna, Seoul National University, and University of Tokyo detail preservation in fluvial, coastal, and floodplain deposits.

Studies of growth, ontogeny, and social behavior draw on histology and trackway analyses conducted by laboratories at Brown University, McGill University, University of Pennsylvania, University of Kansas, and University of Barcelona. Interpretations of vocalization and crest function reference acoustic modeling work associated with MIT, Cornell University, Caltech, University of Southampton, and University of Bristol. Nesting and life-history reconstructions derive from nesting-site reports and embryonic material curated by the Royal Ontario Museum, Museo Paleontológico Egidio Feruglio, Philippine National Museum, and the Smithsonian Institution National Museum of Natural History.

Paleoecological reconstructions place hadrosaurids in ecosystems alongside Tyrannosaurus, Triceratops, Ankylosaurus, Pachycephalosaurus, and contemporaneous flora studied in palynological and isotopic investigations at the United States Geological Survey, Geological Survey of Canada, Chinese Academy of Sciences, Museo Nacional de Ciencias Naturales, and Field Museum. Dental microwear and isotopic analyses conducted by teams from University of Lyon, Dalhousie University, University of Montpellier, and University of California, Berkeley support a primarily herbivorous diet consuming plants documented in macroflora collections at the Smithsonian Institution, Kew Gardens, Royal Botanic Gardens, Kew, and the New York Botanical Garden.

The discovery history includes early descriptions published by paleontologists linked to Yale Peabody Museum, American Museum of Natural History, British Museum (Natural History), and fieldwork by expeditions organized by Peabody Institute, Carnegie Institution, Canadian Geological Survey, and the Mongolian Academy of Sciences. Iconic specimens and mounted skeletons are displayed at institutions such as the Royal Tyrrell Museum, American Museum of Natural History, Natural History Museum, London, Royal Ontario Museum, and National Museum of Natural History (Smithsonian), and have been the subject of monographs by researchers at University of Alberta, University of British Columbia, University of Calgary, University of Madrid, and Peking University.