A new ornithopod (Dinosauria,Ornithischia) from the Upper Cretaceous of Antarctica and its palaeobiogeographical implications |
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| Institution: | 1. Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Av. Ángel Gallardo 470, C1405DJR Buenos Aires, Argentina;2. Fundación de Historia Natural “Félix de Azara”, Universidad Maimónides, V. Virasoro 732, 1405 Buenos Aires, Argentina;3. CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;4. Instituto Antártico Argentino, Cerrito 1248, C1010AAZ Buenos Aires, Argentina;1. Facultad de Ciencias, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510 México, D.F., Mexico;2. Posgrado en Ciencias de la Tierra, Instituto de Geología, Universidad Nacional, Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510 México, D.F., Mexico;3. Earth and Planetary Sciences, McGill University, 3450 University Street, Montreal, Quebec H3A OE8, Canada;4. Posgrado en Ciencias Biológicas, Instituto de Geología, Universidad Nacional, Autónoma de México, Circuito Exterior, Ciudad Universitaria, Coyoacán, 04510 México, D.F., Mexico;5. Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, Apartado Postal 1039, 83000 Hermosillo, Sonora, Mexico;1. Borissiak Paleontological Institute of the Russian Academy of Sciences, Profsoyuznaya 123, 117737 Moscow, Russia;2. Zoological Institute of the Russian Academy of Sciences, Universitetskaya Emb. 1, 199034 Saint Petersburg, Russia;3. Department of Sedimentary Geology, Geological Faculty, Saint Petersburg State University, 16 liniya VO 29, 199178 Saint Petersburg, Russia;4. Department of Historical Geology and Paleontology, Geological Faculty, Saratov State University, 83 Astrakhanskaya Str., 410012 Saratov, Russia;5. Institute of Geology and Petroleum Technology, Kazan Federal University, Kremlevskaya Str. 4/5, 420008 Kazan, Russia;1. Museo Municipal Argentino Urquiza, Jujuy y Chaco s/n, 8319 Rincón de los Sauces, Neuquén, Argentina;2. CONICET, Argentina;3. Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro-Conicet, Av. Gral. J. A. Roca 1242, 8332 General Roca, Río Negro, Argentina;4. Museo Provincial de Ciencias Naturales “Profesor Dr. Juan A. Olsacher”, Dirección Provincial de Minería, Etcheluz y Ejército Argentino, 8340 Zapala, Neuquén, Argentina;5. Departamento Geología y Petróleo, Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, Neuquén 8300, provincia del Neuquén, Argentina |
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| Abstract: | A new ornithopod dinosaur from the Upper Cretaceous (Maastrichtian) Snow Hill Island Formation, at James Ross Island, Antarctica is here described. This new taxon, named as Morrosaurus antarcticus gen. et sp. nov., is represented by a fragmentary right hind limb belonging to a medium-sized individual. Our phylogenetic analysis nests the new taxon in a monophyletic clade of Southern Hemisphere ornithopods that includes most Patagonian and Antarctic ornithopods. Several members of this group share a slender and bunched foot with narrow metatarsal IV, expanded chevrons, and bowed humerus without deltopectoral crest. Several features indicate that these ornithopods exhibit adaptations for a specialized cursorial mode of life. The recognition of Patagonian and Antarctic Ornithopoda belonging to a monophyletic clade reinforces palaeobiogeographical signals indicating that Patagonia, Antarctica and Australia shared a common Late Cretaceous terrestrial fauna. |
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| Keywords: | Ornithopoda Euiguanodontia Palaeobiogeography Antarctica Gondwana Weddelian Province |
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