Diversity of theropod ootaxa and its implications for the latest Cretaceous dinosaur turnover in southwestern Europe |
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| Institution: | 1. Institut Català de Paleontologia Miquel Crusafont (ICP), Carrer de l''Escola Industrial 23, 08201 Sabadell, Barcelona, Spain;2. Grupo Aragosaurus-IUCA, Paleontología, Facultad de Ciencias, Universidad de Zaragoza, C/ Pedro Cerbuna, 12, 50009 Zaragoza, Spain;1. Glenrock Paleon Museum, P.O. Box 1362 Glenrock, WY 82637, USA;2. Department of Biological Sciences, University of Alberta, 11455 Saskatchewan Drive, Edmonton, AB T6G 2E9, Canada;3. School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;1. Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Catania, Via A. Longo, 19, I-95128 Catania, Italy;2. Grant Institute, School of GeoSciences, The King''s Buildings, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, United Kingdom;3. School of Ocean and Earth Science, National Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, United Kingdom;4. Museo Civico di Storia Naturale, Via degli Studi 9, 97013 Comiso, Ragusa, Italy;5. Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Alma Mater Studiorum, Università di Bologna, Via Zamboni, 67, 40126 Bologna, Italy;6. Dipartimento di Scienze della Terra, Università degli Studi di Torino, Via Valperga Caluso, 35, 10125 Torino, Italy;7. Istituto di Geoscienze e Georisorse CNR, 56124 Pisa, Italy;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;1. Departamento de Biologia, Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, São Paulo, Brazil;2. Museu de Zoologia da Universidade de São Paulo, São Paulo, Brazil;3. Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André, São Paulo, Brazil;1. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología, Río Negro, Argentina;2. IIPG, UNRN, Consejo Nacional de Investigaciones Científicas y Tecnológicas (CONICET), Av. Roca 1242, (R8332EXZ) General Roca, Río Negro, Argentina;3. CONICET, Museo Carlos Ameghino, Belgrano 1700, Paraje Pichi Ruca (predio Marabunta), Cipolletti, Río Negro, 8300, Argentina |
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| Abstract: | The scarcity of diagnostic skeletal elements in the latest Cretaceous theropod record of the Ibero-Armorican domain (southwestern Europe) prevents to perform accurate phylogenetic, paleobiogeographic, and diversity studies. In contrast, eggs and eggshells of theropod dinosaurs are relatively abundant and well known in this region from which several ootaxa have been described. Here, we describe the first Late Maastrichtian theropod ootaxon (Prismatoolithus trempii oosp. nov.) from SW Europe and demonstrate that oological record can be used as a proxy for assessing diversity of egg-producers and may help to complement their scarce bone record. The performed analyses indicate that the theropod taxa and ootaxa reach their diversity maxima during the Late Campanian and start to decrease near the Campanian–Maastrichtian boundary at both global and regional scales. The oological diversity of theropods in the Ibero-Armorican domain is consistent with the theropod diversity identified at high taxonomic level. Two distinct assemblages of theropod ootaxa can be recognized in the latest Cretaceous of the Ibero-Armorican domain. Their temporal transition can be correlated with other dinosaur faunal changes recorded in the region. This faunal turnover took place around the Early–Late Maastrichtian boundary, involving ornithopods, sauropods, ankylosaurs and, according to the present results, theropods as well. |
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| Keywords: | Dinosaurs Eggs Theropoda Turnover Late Cretaceous Diversity |
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