The southernmost records of Rebbachisauridae (Sauropoda: Diplodocoidea), from early Late Cretaceous deposits in central Patagonia |
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| Institution: | 1. Centro Nacional Patagónico (Cenpat-CONICET), Boulevard Alte. Brown 2915, (9120) Puerto Madryn, Provincia de Chubut, Argentina;2. Laboratorio de Paleovertebrados, Universidad Nacional de la Patagonia San Juan Bosco, C.C. 360, Comodoro Rivadavia (9000), Chubut, Argentina;3. Section of Vertebrate Paleontology, Carnegie Museum of Natural History, 4400 Forbes Avenue, Pittsburgh, PA 15213, USA;4. Dixie State College, Science Building, 225 South 700 East, St. George, UT 84770, USA;5. Department of Biology, Drexel University, 32nd and Chestnut Streets, Philadelphia, PA 19104, USA;1. Key Laboratory of Marine Hydrocarbon Resource and Environmental Geology, Ministry of Land and Resources, Qingdao, 266071, China;2. Qingdao Institute of Marine Geology, Qingdao 266071, China;3. Dinosaur Trackers Research Group, University of Colorado at Denver, Denver, CO, 80217, USA;4. Department of Environmental Sciences, Tokyo Gakugei University, Koganei, Tokyo 184-8501, Japan;5. Fourth Geological and Mineral Resources Survey of Shandong, Weifang 261021, PR China;1. Instituto de Investigaciones en Paleobiología y Geología, Universidad Nacional de Río Negro, Avenida Roca 1242, General Roca 8332, Río Negro, Argentina;2. Facultad de Ciencias Naturales a Instituto Miguel Lillo, Miguel Lillo 205, San Miguel de Tucumán 4000, Tucumán, Argentina;3. CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;1. Zoological Institute of the Russian Academy of Sciences, Universitetskaya Emb. 1, 199034 Saint Petersburg, Russia;2. Institute of Geology and Petroleum Technology, Kazan Federal University, Kremlevskaya Str. 4/5, 420008 Kazan, Russia;3. Borissiak Paleontological Institute of the Russian Academy of Sciences, Profsouznaya Str. 123, 117997 Moscow, Russia;4. Laboratory of Mesozoic and Cenozoic Continental Ecosystems, Tomsk State University, Lenina Pr. 36, 634050 Tomsk, Russia;5. Vertebrate Zoology Department, Saint Petersburg State University, Universitetskaya Emb. 7/9, 199034 Saint Petersburg, Russia;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. Museo di Storia Naturale di Milano, Corso Venezia 55, Milano 20121 Italy;2. 160 rue Pierre Valdo, Lyon 69005, France;3. Mostra Permanente di Geo-Paleontologia, Parco Regionale del Monte Subasio, Cà Piombino, Assisi 06081, Italy;4. Dipartimento di Scienze Biologiche, Geologiche ed Ambientali, Università di Bologna, Via Zamboni 67, Bologna 40126, Italy;5. Museo Geologico e Paleontologico “Giovanni Capellini”, Via Zamboni 63, Bologna 40126, Italy;6. Dipartimento di Scienze della Terra, “Sapienza” Università di Roma, Piazzale Aldo Moro 5, Roma 00185, Italy |
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| Abstract: | We describe new and redescribe previously discovered sauropod dinosaur material from the Upper Cretaceous (middle Cenomanian–Turonian) Bajo Barreal Formation of south-central Chubut Province, central Patagonia, Argentina. The remains consist of associated and isolated axial skeletal elements recovered from three separate localities, and are herein assigned to the morphologically aberrant Rebbachisauridae clade. Several of the fossils exhibit osteological characters that were previously undocumented in rebbachisaurids, enhancing our understanding of the morphological diversity of this enigmatic sauropod group. In particular, the Bajo Barreal material demonstrates the occurrence within Rebbachisauridae of bifurcate neural spines in cervical vertebrae and well-developed, presumably pneumatic fossae in caudal vertebrae; among Diplodocoidea, these distinctive morphologies had previously been recognized only in flagellicaudatans. Furthermore, the Bajo Barreal fossils constitute the southernmost known occurrences of Diplodocoidea, adding to the globally sparse Late Cretaceous record of these sauropods and augmenting our knowledge of central Patagonian terrestrial vertebrate assemblages during this interval. |
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