Histology of teeth and tooth attachment in titanosaurs (Dinosauria; Sauropoda) |
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| Institution: | 1. Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Investigación en Paleontología y Geología, Universidad Nacional de Río Negro, Museo “Carlos Ameghino”, Belgrano 1700, 8324, Cipolletti, Río Negro, Argentina;2. Instituto de Investigaciones en Paleobiología y Geología, Universidad Nacional de Río Negro, Avenida Roca 1242, General Roca, 8332, Río Negro, Argentina;1. Universidade Federal do Estado do Rio de Janeiro, Departamento de Ciências Naturais, Av. Pasteur, 458, Sala 406, Urca, Rio de Janeiro, RJ CEP 22290-040, Brazil;2. Universidade Federal de São Carlos, Departamento de Ecologia e Biologia Evolutiva, Via Washington Luis, Km 235, CP 676, São Carlos, SP CEP 13565-905, Brazil;1. Institut Català de Paleontologia Miquel Crusafont (ICP), Edifici Z (ICTA-ICP), Carrer de les Columnes s/n, Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès, Barcelona, Spain;2. ICREA at Institut Català de Paleontologia Miquel Crusafont (ICP), Edifici Z (ICTA-ICP), Carrer de les Columnes s/n, Campus de la UAB, 08193 Cerdanyola del Vallès, Barcelona, 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. Institut Català de Paleontologia Miquel Crusafont (ICP), Edifici Z, c/de les Columnes, s/n., Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain;2. ICREA at Institut Català de Paleontologia Miquel Crusafont (ICP), Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain;2. Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, 142 Xi-Zhi-Men-Wai Street, Beijing 100044, China;3. Department of Biological Sciences, The George Washington University, Washington, DC 20052, USA;4. CNRS UMR 5276, Université Claude Bernard Lyon 1 and Ecole Normale Supérieure de Lyon, Villeurbanne Cedex 69622, France;5. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, 19 Bei-Tu-Cheng-Xi Road, Beijing 100029, China;6. Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 239 Zhangheng Road, Shanghai 201204, China;1. Faculty of Science, Engineering and Technology, Swinburne University of Technology, John St, Hawthorn, Victoria 3122, Australia;2. Australian Age of Dinosaurs Natural History Museum, The Jump-Up, Winton, Queensland 4735, Australia |
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| Abstract: | Dental histology of periodontal tissues (cementum, periodontal ligament and alveolar bone) has been studied in mammals, crocodylians and some basal tetrapods, but these structures have never been studied in titanosaur sauropods. The goal of this work was to study the structures of dental insertion in Titanosaurs. Like many physiological processes, histological analysis of titanosaur teeth shows hard tissue formation, characterized by a circadian rhythm. From thin sections it was possible to observe microstructures such as incremental lines of von Ebner, dentinal tubules and cross striations, all key to the understanding of developmental tooth dynamics. The structural and histological analyses carried out here on teeth of Late Cretaceous titanosaurs reveals the presence of acellular and cellular cementum, periodontal ligament, and alveolar bone, all structures necessary for a truly thecodont dentition. This is the first time documented for a dinosaur via histological tissue, and is an important finding that will help elucidate aspects of dinosaurian dentition, tooth replacement rate, feeding strategy, metabolism, and general biology. |
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| Keywords: | Dental histology Sauropod Titanosaur von Ebner lines Cementum Dentine Enamel |
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