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| Saurischia | |
|---|---|
| Name | Saurischia |
| Fossil range | Late Triassic–Present (birds) |
| Kingdom | Animalia |
| Phylum | Chordata |
| Clade | Dinosauria |
| Subgroups | Theropoda, Sauropodomorpha |
Saurischia
Saurischia is a major clade of Dinosauria traditionally defined by a lizard-like pelvic structure and encompassing diverse taxa including large long-necked Sauropodomorpha and primarily carnivorous Theropoda. Key discoveries and interpretations have involved figures and institutions such as Richard Owen, Othniel Charles Marsh, Edward Drinker Cope, American Museum of Natural History, and Natural History Museum, London, shaping debates across venues like the Royal Society and the Geological Society of London. Specimens from formations studied by teams at University of Chicago, Smithsonian Institution, University of California, Berkeley, and University of Cambridge have informed anatomical, phylogenetic, and evolutionary hypotheses.
Saurischian anatomy is characterized by a semi-opposable pubis, elongate hindlimbs, and often tridactyl manus or pes morphology, as noted in comparative work at Field Museum of Natural History, Yale Peabody Museum, and American Museum of Natural History. Iconic genera described by paleontologists such as John Ostrom, Barnum Brown, Paul Sereno, José Bonaparte, David B. Weishampel, Philip J. Currie, and Zhang Yimou (note: Zhang as collector context) show pelvic variations, vertebral pneumaticity, and adaptations for flight in avian-line theropods studied in collections at Natural History Museum Vienna, Royal Tyrrell Museum, and Museum für Naturkunde Berlin. Morphological datasets developed by teams at University of Toronto, University of Chicago, Harvard University, and University of Oxford integrate osteological, myological, and integumentary evidence, with contributions from researchers affiliated with Smithsonian Institution and Los Angeles County Museum of Natural History.
Classification frameworks have been proposed and revised by authorities including Harry Seeley, Thomas Huxley, Gideon Mantell, Hermann von Meyer, and modern systematists such as Paul Sereno, Gerald G. Grellet-Tinner, Matthew T. Carrano, Brandon P. Hedrick, and Michael J. Benton. Phylogenetic matrices constructed at American Museum of Natural History, Natural History Museum, London, and Institute of Vertebrate Paleontology and Paleoanthropology contrast saurischian topology with Ornithischia and have been debated in venues such as Journal of Vertebrate Paleontology, Nature, Science, and Proceedings of the Royal Society B. Analyses by Xu Xing, Stephen Brusatte, Paul M. Barrett, Roger B.J. Benson, and Mark Norell deploy Bayesian and parsimony methods, referencing specimens from Mamenchisaurus site, La Brea Tar Pits (for comparative avian remains), and Ischigualasto Formation.
Hypotheses for saurischian origins have been advanced by researchers at Universidad Nacional de San Juan, University of São Paulo, University of Buenos Aires, Universidad Nacional de La Plata, and Museo Argentino de Ciencias Naturales', reflecting fieldwork in Ischigualasto-Villa Unión Basin, Chañares Formation, Kayenta Formation, Lower Elliot Formation, and Gondwana-derived basins. Prominent contributors such as Carlo C. Serrelli, Fernando Novas, Richard Butler, Nizar Ibrahim, Paul Upchurch, and Kevin Padian have integrated data from Late Triassic taxa like Eoraptor, Herrerasaurus, and Saturnalia to test divergence timing using molecular clock calibrations developed at University of Michigan and University College London. Biogeographic scenarios invoke vicariance and dispersal across paleocontinents documented by teams at German Research Centre for Geosciences, GeoZentrum Nordbayern, and Paleontological Institute of Zurich.
Research into saurischian physiology, growth, and behavior draws on histology studies by Armand de Ricqlès, John R. Horner, Bruce Rothschild, and Scott Sampson, and on functional analyses by Richard A. Thulborn, James O. Farlow, and Peter Dodson. Flight origins and avian evolution have been explored by Thomas H. Rich, Phil Senter, Alan Feduccia, John Ruben, and Luis Chiappe, with fossil evidence from Liaoning Province assemblages curated at Yuanqing Museum and studies published via Chinese Academy of Sciences. Paleoecological reconstructions from sites such as Morrison Formation, Hell Creek Formation, Sihetun locality, and Romualdo Formation involve collaborations among University of Colorado, University of Kansas, University of Montana, and Universidade Federal do Rio Grande do Sul.
Theropoda, studied extensively by John Ostrom, Gregory S. Paul, Luis Chiappe, Xu Xing, and Thomas Holtz, includes Tyrannosaurus, Velociraptor, Allosaurus, Spinosaurus, Deinonychus, and avian lineages preserved in Solnhofen Limestone, Jehol Biota, and Green River Formation analogs. Sauropodomorpha, with contributors like José Bonaparte, Jack McIntosh, Michel Lau, Paul Upchurch, and Jeffrey A. Wilson, includes Apatosaurus, Diplodocus, Brachiosaurus, Mamenchisaurus, Argentinosaurus, and basal prosauropods such as Plateosaurus and Massospondylus, excavated in localities worked by Field Museum, Museo de la Plata, and Museo Paleontológico Egidio Feruglio teams. Comparative anatomy is detailed in monographs published by Cambridge University Press, University of California Press, and the Smithsonian Institution Press.
Saurischian fossils occur worldwide, from Triassic strata in Argentina and Brazil to Jurassic deposits in United States, Portugal, China, Tanzania, and Mongolia, with Cretaceous records across North America, Europe, Africa, Asia, and Australia. Major formations yielding critical specimens include the Morrison Formation, Solnhofen Limestone, Ischigualasto Formation, Chubut Province sites, Liaoning beds, and Gondwanan basins, with specimens housed at institutions such as Museo Argentino de Ciencias Naturales', Royal Tyrrell Museum, Beijing Museum of Natural History, and Natural History Museum, London. Taphonomic and stratigraphic frameworks have been refined by teams from University of Buenos Aires, Stellenbosch University, University of the Witwatersrand, University of Cape Town, and Museum Victoria.
The saurischian concept was established in the 19th century through work by Harry Seeley and popularized in taxonomic syntheses by Richard Owen, Thomas Huxley, and later consolidated by Othniel Charles Marsh and Edward Drinker Cope, with enduring debates carried out in journals like Philosophical Transactions of the Royal Society, Annals and Magazine of Natural History, and Bulletin of the American Museum of Natural History. 20th- and 21st-century revisions and discoveries by John Ostrom, Jack Horner, Philip Currie, Paul Sereno, Xu Xing, Fernando Novas, and Paul M. Barrett have reshaped interpretations, incorporating methods from cladistics (originating with Willi Hennig) and modern imaging developed at European Synchrotron Radiation Facility, Argonne National Laboratory, and Natural History Museum, London laboratories, and public outreach via institutions like Smithsonian Institution and American Museum of Natural History.
Category:Dinosaurs