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6 results for “Gorgosaurus libratus”
Supporting CT data for: Ontogenetic changes in endocranial anatomy in <em>Gorgosaurus libratus</em> (Theropoda: Tyrannosauridae) provide insight into the evolution of the tyrannosauroid endocranium
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Supporting CT Data for: Two exceptionally preserved juvenile specimens of Gorgosaurus libratus (Tyrannosauridae, Albertosaurinae) provide new insight into the timing of ontogenetic changes in tyrannosaurids
<p>Known from dozens of specimens discovered since the early 20<sup>th</sup> century, <em>Gorgosaurus libratus</em> has arguably contributed more than any other taxon to our understanding of the life history of tyrannosaurids. However, juvenile material for this taxon is rare. Here, we describe two small, articulated <em>Gorgosaurus</em> specimens (skull lengths of ~500 mm) that help advance our knowledge of the anatomy and ontogeny of this taxon and of tyrannosaurids in general. The new specimens exhibit hallmark juvenile tyrannosaurid features, including long, low, and narrow skulls, large circular orbits, absent or incipient cranial ornamentation, ziphodont dentition, and an overall gracile skull frame. Comparison with other <em>Gorgosaurus</em> specimens of various ontogenetic stages allows for an examination of the timing of morphological changes that occurred through ontogeny in this taxon relative to other tyrannosaurids. Of particular note, <em>Gorgosaurus</em> and the larger <em>Tyrannosaurus rex</em> are found to have experienced similar ontogenetic transformations at similar percent skull length relative to the large known individuals for each respective taxon but at different absolute body sizes and biological ages, occurring at a larger size and older age in <em>T. rex</em> than in <em>Gorgosaurus</em>. These results suggest a dissociation between the timing of cranial development and body size in tyrannosaurids. Finally, the recognition of ontogenetically invariant characters in <em>Gorgosaurus</em> makes it possible to determine the taxonomic identity of previously misidentified specimens.</p>
text-fig. 10. Maxillae of a sauropodomorph (a) and two theropods (b-c) in left lateral view to illustrate the character states of characters 11, 12 and 86. a, Plateosaurus sp., left maxilla (GPIT Skelett 1). B, Ceratosaurus sp., left maxilla (UUVP VP 5278). c, Gorgosaurus libratus, right maxilla (reversed; ROM 1247). Scale bars represent 50 mm (a) and 100 mm (b-c). in The interrelationships and evolution of basal theropod dinosaurs
text-fig. 10. Maxillae of a sauropodomorph (a) and two theropods (b-c) in left lateral view to illustrate the character states of characters 11, 12 and 86. a, Plateosaurus sp., left maxilla (GPIT Skelett 1). B, Ceratosaurus sp., left maxilla (UUVP VP 5278). c, Gorgosaurus libratus, right maxilla (reversed; ROM 1247). Scale bars represent 50 mm (a) and 100 mm (b-c).
text-fig. 6. Skull reconstructions of representatives of Cretaceous OTUs in left lateral view, a, abelisaurid Camotaurus sastrei, Late Cretaceous (Campanian), Gorro Frigio Formation, Argentina; based on Bonaparte et al. (1990) and MACN CH 894. b, composite skull of a generalized baryonychid; mainly based on Suchomimus tenerensis (MNN GDF 501, 503-506) and Irritator challenged (SMNS 58022), with some elements reconstructed after Baryonyx walkeri (BMNH R 9951). c, carcharodontosaurid Carcharodontosaurus sahariens, Late Cretaceous (Cenomanian), Kem Kem beds, Morocco; based on Sereno et al. (1996) and SGM-Din 1, unpreserved elements shaded. D, dromaeosaurid Velociraptor mongoliensis, Late Cretaceous (Campanian), Djadokhta Formation, Mongolia; based on Barsbold (1983), Barsbold and Osmólska (1999), and AMNH 6515. e, ornithomimosaur Dromiceiomimus brevitertius, Late Cretaceous (Maastrichtian), Horseshoe Canyon Formation, Alberta, Canada; redrawn from Russell (1972). F, oviraptorosaur Oviraptor philoceratops, Late Cretaceous (Campanian), Djadokhta Formation, Mongolia; redrawn from Barsbold et al. (1990). G, therizinosauroid Erlikosaurus andrewsi, Late Cretaceous (Cenomanian- Turonian), Baynshiren Svita, Mongolia; based on Clark et al. (1994). H, tyrannosaurid Gorgosaurus libratus, Late Cretaceous (Campanian), Judith River Formation, Alberta, Canada, redrawn from Molnar et al. (1990). Abbreviations as in Text-figures 4 and 5, and: acc. op., accessory opening of unknown function in the premaxilla of Oviraptor (Barsbold et al. 1990); amf, anterior maxillary foramen; pn, pneumatic openings. Scale bars represent 50 mm (d-g) and 100 mm (a-c, h). in The interrelationships and evolution of basal theropod dinosaurs
text-fig. 6. Skull reconstructions of representatives of Cretaceous OTUs in left lateral view, a, abelisaurid Camotaurus sastrei, Late Cretaceous (Campanian), Gorro Frigio Formation, Argentina; based on Bonaparte et al. (1990) and MACN CH 894. b, composite skull of a generalized baryonychid; mainly based on Suchomimus tenerensis (MNN GDF 501, 503-506) and Irritator challenged (SMNS 58022), with some elements reconstructed after Baryonyx walkeri (BMNH R 9951). c, carcharodontosaurid Carcharodontosaurus sahariens, Late Cretaceous (Cenomanian), Kem Kem beds, Morocco; based on Sereno et al. (1996) and SGM-Din 1, unpreserved elements shaded. D, dromaeosaurid Velociraptor mongoliensis, Late Cretaceous (Campanian), Djadokhta Formation, Mongolia; based on Barsbold (1983), Barsbold and Osmólska (1999), and AMNH 6515. e, ornithomimosaur Dromiceiomimus brevitertius, Late Cretaceous (Maastrichtian), Horseshoe Canyon Formation, Alberta, Canada; redrawn from Russell (1972). F, oviraptorosaur Oviraptor philoceratops, Late Cretaceous (Campanian), Djadokhta Formation, Mongolia; redrawn from Barsbold et al. (1990). G, therizinosauroid Erlikosaurus andrewsi, Late Cretaceous (Cenomanian- Turonian), Baynshiren Svita, Mongolia; based on Clark et al. (1994). H, tyrannosaurid Gorgosaurus libratus, Late Cretaceous (Campanian), Judith River Formation, Alberta, Canada, redrawn from Molnar et al. (1990). Abbreviations as in Text-figures 4 and 5, and: acc. op., accessory opening of unknown function in the premaxilla of Oviraptor (Barsbold et al. 1990); amf, anterior maxillary foramen; pn, pneumatic openings. Scale bars represent 50 mm (d-g) and 100 mm (a-c, h).
text-fig. 7. Outgroup (a) and theropod (b-g) skull reconstructions in lateral view showing different character states of several cranial characters. For sources of reconstructions and identifications of the bones see Text-figures 4-6. a, Euparkeria capensis. B, Syntarsus rhodesiensis. c, Ceratosaurus sp. D, Allosaurus fragilis. E, Gorgosaurus libratus. F, Velociraptor mongoliensis. Character state indications in this and all following illustrations are as follows: numbers refer to characters discussed in the text; the first number indicates the number of the character, the second the character state. Scale bars represent 10 mm (a-b), 50 mm (f-g) and 100 mm (c-e). in The interrelationships and evolution of basal theropod dinosaurs
text-fig. 7. Outgroup (a) and theropod (b-g) skull reconstructions in lateral view showing different character states of several cranial characters. For sources of reconstructions and identifications of the bones see Text-figures 4-6. a, Euparkeria capensis. B, Syntarsus rhodesiensis. c, Ceratosaurus sp. D, Allosaurus fragilis. E, Gorgosaurus libratus. F, Velociraptor mongoliensis. Character state indications in this and all following illustrations are as follows: numbers refer to characters discussed in the text; the first number indicates the number of the character, the second the character state. Scale bars represent 10 mm (a-b), 50 mm (f-g) and 100 mm (c-e).
Supporting CT Data for: Two exceptionally preserved juvenile specimens of Gorgosaurus libratus (Tyrannosauridae, Albertosaurinae) provide new insight into the timing of ontogenetic changes in tyrannosaurids
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