New rebbachisaurid (Dinosauria: Sauropoda) material from the Wessex Formation (Barremian,Early Cretaceous), Isle of Wight,United Kingdom |
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| Institution: | 1. Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, UK;2. Dinosaur Isle Museum, Culver Parade, Sandown, Isle of Wight, PO36 8QA, UK;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. Institute of Geography and Geology, University of Greifswald, Friedrich-Ludwig-Jahn-Straße 17a, 17487 Greifswald, Germany;2. Bahnhofstraße 36b, 19057 Schwerin-Warnitz, Germany;1. Museo de Ciencias Naturales, Universidad Nacional del Comahue, Buenos Aires 1400, Neuquén, Argentina;2. Cátedra Reptiles Mesozoicos, Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, Neuquén, Argentina;3. Secretaría de Cultura, Ministerio de Cultura, Turismo y Deportes, Gobierno de la Provincia de Río Negro, Museo Provincial Carlos Ameghino, Belgrano 2150, Paraje Pichi Ruca (Predio Marabunta), Cipolletti, Río Negro, Argentina;4. Section of Vertebrate Paleontology, Carnegie Museum of Natural History, 4400 Forbes Avenue, Pittsburgh, PA 15213, USA;1. Museum für Naturkunde, Leibniz-Institut für Evolutions-und Biodiversitätsforschung, Invalidenstraße 43, 10115 Berlin, Germany;2. Humboldt Universität, Berlin, Germany;3. Laboratoire de Paléontologie, Evolution, Paléoécosystèmes et Paléoprimatologie (PALEVOPRIM, UMR7262 CNRS INEE), Université de Poitiers, 6, rue Michel-Brunet, 86073 Poitiers Cedex, France;4. Universidad del País Vasco/Euskal Herriko Unibertsitatea, Facultad de Ciencia y Tecnología, Dpto. Estratigrafía y Paleontología, Apartado 644, 48080 Bilbao, Spain;5. Earth System Science – AMGC, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium;6. Evolution & Diversity Dynamics Lab, Liège University, Allée du Six Août, 14, 4000 Liège, Belgium;7. Directorate ‘Earth and History of Life’, Royal Belgian Institute of Natural Sciences, 1000 Brussels, Belgium;8. Palaios Association, 86300 Valdivienne, France;1. Centro Paleontológico Lago Barreales (CePaLB), Ruta Provincial 51, km. 65, Cátedra de Introducción a la Paleontología, Universidad Nacional del Comahue, Neuquén, Argentina;2. Laboratorio de Anatomía Comparada y Evolución de los Vertebrados, Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”, Av. Ángel Gallardo 470 (C1405DJR), Buenos Aires, Argentina;3. CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;4. Fundación de Historia Natural “Félix de Azara”, Universidad Maimónides, Hidalgo 775 (C1405BDB), Buenos Aires, Argentina;5. School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, United Kingdom;6. Instituto de Investigación en Paleobiología y Geología, Universidad Nacional de Río Negro, Museo Carlos Ameghino, Belgrano 1700, Paraje Pichi Ruca (predio Marabunta), Cipolletti 8300, Río Negro, Argentina |
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| Abstract: | Rebbachisauridae is a poorly understood clade of diplodocoid sauropod dinosaurs, currently known only from the Cretaceous of Africa, Europe and South America. European representatives are particularly rare and fragmentary. Here, we report an anterior caudal vertebra from the Barremian (Early Cretaceous) Wessex Formation of the Isle of Wight, off the southern coast of England. This specimen possesses several features known only in rebbachisaurids and shares two synapomorphies with the Afro-European taxa Demandasaurus darwini and Nigersaurus taqueti, both pertaining to the morphology of the neural spine. These features are the development of triangular lateral processes and the presence of an elliptical fossa on the lateral surface, bounded by the lateral lamina and postspinal rugosity. The Isle of Wight specimen also shares several features solely with Demandasaurus, indicating a close relationship with the Spanish taxon. These include the presence of a hyposphenal ridge, as well as an anteriorly excavated caudal rib that is restricted almost entirely to the neural arch. However, it differs from Demandasaurus in a number of ways, including the lack of excavation on the posterior surface of the caudal rib, the orientation of the neural spine, and the composition and morphology of the lateral lamina. In addition, the Isle of Wight vertebra possesses one potential autapomorphy: bifurcation of the elliptical fossa on the neural spine. However, because of the fragmentary nature of the material, a new name is not erected. Along with Demandasaurus and Histriasaurus boscarollii, this caudal vertebra indicates the presence of at least three European rebbachisaurid taxa and provides new anatomical information on this enigmatic clade of sauropod dinosaurs. |
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