A complete titanosaur femur from West Texas with comments regarding hindlimb posture |
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| Institution: | 1. Division of Science and Resource Management, Big Bend National Park, TX 79834, United States;2. Department of Geosciences, Texas Tech University, Lubbock, TX 79409, United States;1. Department of Biological Sciences, University of Alberta, Edmonton, Alberta, T6G 2E9, Canada;2. Royal Tyrrell Museum of Palaeontology, Drumheller, Alberta, T0J 0Y0, Canada;3. Departamento de Ciencias Humanas, Universidad de La Rioja, 26004, Logroño, La Rioja, Spain;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;1. Fundación Conjunto Paleontológico de Teruel-Dinópolis, Museo Aragonés de Paleontología, Av. Sagunto s/n, E-44002 Teruel, Spain;2. Directorate ‘Earth and History of Life’, Royal Belgian Institute of Natural Sciences, rue Vautier 29, B-1000 Brussels, Belgium;1. Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Invalidenstrasse 43, 10115, Berlin, Germany;2. Grupo de Biología Evolutiva, Facultad de Ciencias, UNED, Senda del Rey 9, 28040, Madrid, Spain;3. Unidad de Paleontología, Departamento de Biología, Universidad Autónoma de Madrid, Calle Darwin 2, 20049, Madrid, Spain;4. Facultad de Bellas Artes, Universidad Complutense de Madrid, Calle Pintor el Greco 2, 28040, Madrid, Spain;1. Departamento de Paleontología, Museo del Desierto, Carlos Abedrop Dávila 3745, 25015 Saltillo, Coahuila, Mexico;2. Staatliches Museum für Naturkunde Karlsruhe, Geowissenschaftliche Abteilung, Erbprinzenstrasse 13, 76133 Karlsruhe, Germany;3. Institut für Geowissenschaften, Universität Heidelberg, Im Neunheimer Feld 234-236, 69120 Heidelberg, Germany |
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| Abstract: | An isolated titanosaur femur recovered from the Javelina Formation (Maastrichtian) of Big Bend National Park, Texas is the most complete example yet reported from North America. The specimen is likely referable to Alamosaurus sanjuanensis, the only titanosaur thus far known from Upper Cretaceous strata in North America, but cannot be attributed with certainty to that taxon. Compared to femora from other titanosaurs, the specimen has a relatively reduced abductor crest, a less elevated femoral head, and a distal joint surface that is orthogonal to the long axis of the shaft. These differences suggest that the Big Bend femur pertains to a species where hindlimb stance was closer to vertical, and with a comparatively narrower gait than other titanosaurids. |
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| Keywords: | Late Cretaceous Texas Sauropod Hindlimb |
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