Tyrannosauridae — LLMpedia

Tyrannosauridae
User:Therop User:Morosaurus shinyae Jordi Payà Tony Cairns ★Kumiko★ Kabacchi · CC BY 2.0 · source
Name	Tyrannosauridae
Fossil range	Late Cretaceous
Kingdom	Animalia
Phylum	Chordata
Clade	Dinosauria
Order	Saurischia
Suborder	Theropoda
Family	Tyrannosauridae

Contents

Tyrannosauridae is a family of large theropod Dinosauria known from the Late Cretaceous of North America, Asia, and possibly Europe and South America, characterized by massive skulls, robust hindlimbs, and reduced forelimbs. Members of the family have figured prominently in studies by institutions such as the American Museum of Natural History, the Royal Tyrrell Museum, the Smithsonian Institution, and universities including Harvard University and the University of Alberta. Research on tyrannosaurids intersects work by paleontologists from the Field Museum, the Natural History Museum, London, the Canadian Museum of Nature, and field programs funded by agencies like the National Science Foundation and the Natural Sciences and Engineering Research Council.

Description and anatomy

Tyrannosaurids are apex predators with proportionally large skulls, binocular vision, and ziphodont dentition, described in anatomical studies from institutions such as the University of Chicago, the University of California, Berkeley, the Royal Ontario Museum, the American Museum of Natural History, and the Natural History Museum of Los Angeles County. Their skull architecture includes robust cranial elements studied in conjunction with comparative work on Allosaurus, Spinosaurus, Ceratosaurus, Carcharodontosaurus, and Giganotosaurus, and features pneumatic cranial sinuses analyzed using CT facilities at Stanford University, the University of Utah, the Western University, the University of Toronto, and the University of California, Los Angeles. Limb proportions—short, two-fingered forelimbs and powerful hindlimbs—are compared in museum collections at the Smithsonian Institution, the Field Museum, the Royal Tyrrell Museum, the Natural History Museum, London, and the Royal Belgian Institute of Natural Sciences by researchers influenced by work from John Ostrom, Robert Bakker, Jack Horner, Paul Sereno, and Thomas Holtz.

Phylogenetic analyses place tyrannosaurids within Coelurosauria and close to other derived theropods examined in matrices published by research groups at Harvard University, the University of Texas at Austin, the University of Washington, the University of Chicago, and the American Museum of Natural History. Cladistic work references genera such as Dilong, Proceratosaurus, Alioramus, Daspletosaurus, and Albertosaurus and draws on comparative datasets curated by researchers affiliated with Yale University, the University of Florida, the University of British Columbia, the Royal Tyrrell Museum, and the Natural History Museum, London. Molecular clock studies, biomechanical modeling, and stratigraphic correlation produced by teams at the University of Pennsylvania, the University of Calgary, the University of Alberta, and the Paleontological Research Institution have informed hypotheses about diversification during events recognized by the Campanian and Maastrichtian stages and in relation to faunal turnovers documented in work from Montana State University and the Chinese Academy of Sciences.

Functional studies of bite force, feeding mechanics, and ontogenetic dietary shifts employ comparative frameworks developed at the Field Museum, the Smithsonian Institution, the American Museum of Natural History, the Royal Tyrrell Museum, and the University of California, Berkeley. Interpretations of sociality, pack behavior, and intraspecific combat reference tracksites and bonebeds investigated by teams from the University of Alberta, the Royal Ontario Museum, the University of Utah, the Museum of the Rockies, and the Natural History Museum, London. Paleoecological reconstructions link tyrannosaurid niches to contemporaneous taxa such as Triceratops, Hadrosaurus, Ankylosaurus, Pachycephalosaurus, and Troodon and rely on sedimentological and isotopic studies conducted at the University of Chicago, the University of California, Los Angeles, the University of Toronto, the Geological Survey of Canada, and the Chinese Academy of Sciences.

Major genera and species recognized by global paleontological consensus include taxa curated and debated at institutions like the Royal Tyrrell Museum, the Field Museum, the American Museum of Natural History, the Smithsonian Institution, and the Natural History Museum, London: Tyrannosaurus rex specimens housed at the Field Museum and the Natural History Museum, London; Daspletosaurus specimens from the Dinosaur Provincial Park collections at the Royal Tyrrell Museum; Gorgosaurus and Albertosaurus material examined at the Royal Tyrrell Museum and the Royal Ontario Museum; Tarbosaurus bataar material from the Nemegt Formation curated in the Mongolian Academy of Sciences and the Paleontological Institute, Moscow; and contentious taxa like Nanotyrannus whose status has been debated in publications from the Burke Museum, the University of Kansas Natural History Museum, the Smithsonian Institution, and the Field Museum.

The discovery and study of tyrannosaurids involve historical fieldwork initiated in the late 19th and early 20th centuries by figures associated with the American Museum of Natural History, the British Museum (Natural History), the United States Geological Survey, the Geological Survey of Canada, and expeditions funded by the National Geographic Society and the Smithsonian Institution. Methodological advances include CT scanning and digital modeling at Stanford University, isotopic and histological sampling developed at the University of California, Berkeley, the University of Wisconsin–Madison, the University of Texas at Austin, and the University of Alberta, and biomechanical simulations produced by research groups at the University of Manchester, the University of Sheffield, the University of Tokyo, and the University of Chicago. Modern synthesis of tyrannosaurid data is curated in databases maintained by the Paleobiology Database, the Natural History Museum, London, the Royal Tyrrell Museum, the American Museum of Natural History, and collaborative networks like the International Paleontological Association.