A new Late Miocene chondrichthyan assemblage from the Chagres Formation,Panama |
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| Affiliation: | 1. Paleontological Institute and Museum, University of Zurich, Karl-Schmid-Strasse 4, CH-8006, Switzerland;2. Center for Tropical Paleoecology and Archaeology, Smithsonian Tropical Research Institute, Balboa, Ancón, 0843-03092, Panama;3. Florida Museum of Natural History, University of Florida, Gainesville, FL, 32611, USA;4. University of Florida, Gainesville, FL, 32611, USA;5. Universidade Federal Fluminense, Instituto de Biologia, Departamento e Pós-graduação em Biologia Marinha e Ambientes Costeiros, Campus do Valonguinho, Outeiro São João Batista, s/n, 24020-141 Niterói, RJ, Brazil;6. Museo Argentino de Ciencias Naturales, Caballito, Buenos Aires, Argentina;1. Dipartimento di Scienze della Terra, Università di Pisa, 53 via S. Maria, 56126 Pisa, Italy;2. Departamento de Paleontologia de Vertebrados, Museo de Historia Natural-UNMSM, 1256, Avenida Arenales, Lima 14, Peru;3. Institut royal des sciences naturelles de Belgique, D.O. Terre et Histoire de la vie, 29, rue Vautier, 1000 Brussels, Belgium;1. Instituto de Geología, Universidad Nacional Autónoma de México, Circuito de La Investigación S/N, Ciudad Universitaria, Coyoacán, Ciudad de México, 04510, Mexico;2. UMR 7207, Centre de Recherche en Paléontologie - Paris, Museum Nationald’Histoire Naturelle. 8 Rue Buffon, CP 38, Paris, 75005, France;3. Facultad de Ciencias, Universidad Nacional Autónoma de México; Circuito de La Investigación S/N, Ciudad Universitaria, Coyoacán, Ciudad de México, 04510, Mexico;4. Museo de Paleontología Eliseo Palacios Aguilera, Dirección de Paleontología, Secretaria de Medio Ambiente e Historia Natural, Calzada de Los Hombres Ilustres S/N, Antiguo Parque Madero, Tuxtla Gutiérrez, Chiapas, Mexico;5. Posgrado en Ciencias Biológicas, Unidad de Posgrado, Edificio A, 1° Piso, Circuito de Posgrados, Ciudad Universitaria, Coyoacán, Ciudad de México, 04510, Mexico;1. Department of Environmental Science and Studies and Department of Biological Sciences, DePaul University, 2325 North Clifton Avenue, Chicago, IL 60614, USA;2. Sternberg Museum of Natural History, Fort Hays State University, 3000 Sternberg Drive, Hays, KS 67601, USA;1. Área Paleontología, Fundación de Historia Natural ‘Félix de Azara’, Departamento de Ciencias Naturales y Antropología, Universidad Maimónides, Hidalgo 775 piso 7 (C1405BDB), Buenos Aires, 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. Red Paleontológica U-Chile, Laboratorio de Ontogenia y Filogenia, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras, 3425, Santiago, Chile;4. Comisión Nacional de Investigaciones Científicas y Técnicas, Argentina |
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| Abstract: | The lLate Miocene Chagres Formation from northern Panama contains the youngest outcrops of the Panama Canal Basin. Here we report two chondrichthyan assemblages that include 30 taxa from both the Rio Indio and Chagres Sandstone Members of the Chagres Formation. We report 18 new fossil records for Panama and four for tropical America, constituting the most diverse chondrichthyan association for the Cenozoic of Panama. We performed a paleobathymetry analysis based on the modern water depth preference of extant chondrichthyan taxa. The assemblage from the Rio Indio Member is characterized by taxa with neritic affinities, suggesting depths <100 m, whereas the assemblage from the Chagres Sandstone Member is dominated by taxa with oceanic affinities, suggesting 200–300 m water depths. The Chagres Sandstone Member could have accumulated at the edge of a platform–upper slope, bordered by a deep oceanic margin. |
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| Keywords: | Neogene Tropical America Panama Canal Basin Sharks Rays Paleoecology |
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