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      Fossil fishes and anurans from the Miocene of Rio Chico and Cerro Zeballos, Chubut Province, Argentina

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          Abstract

          Abstract The fossil record of freshwater fishes and anurans from the Miocene in Patagonia is relatively patchy, a large number of specimens remaining undescribed. The aim of the present contribution is to describe a fossil association of percomorphacean fishes and calyptocephalellid anurans from the early to late Miocene Collón Curá Formation, at Chubut province, Patagonia, Argentina. In spite of being represented by several specimens, both anurans and fishes show a very low taxonomic diversity. This pattern matches with other fossil sites from the Cenozoic of Patagonia, as well as with the extant Patagonian batrachofaunas and ichthyofaunas. The fossil record of frogs and fishes in Patagonia is represented by few lineages that have a large evolutionary history in the area, and occasionally can be traced up to the Late Mesozoic.

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          Fish biodiversity and conservation in South America.

          R. Reis, J. Albert, F Di Dario … (2016)
          The freshwater and marine fish faunas of South America are the most diverse on Earth, with current species richness estimates standing above 9100 species. In addition, over the last decade at least 100 species were described every year. There are currently about 5160 freshwater fish species, and the estimate for the freshwater fish fauna alone points to a final diversity between 8000 and 9000 species. South America also has c. 4000 species of marine fishes. The mega-diverse fish faunas of South America evolved over a period of >100 million years, with most lineages tracing origins to Gondwana and the adjacent Tethys Sea. This high diversity was in part maintained by escaping the mass extinctions and biotic turnovers associated with Cenozoic climate cooling, the formation of boreal and temperate zones at high latitudes and aridification in many places at equatorial latitudes. The fresh waters of the continent are divided into 13 basin complexes, large basins consolidated as a single unit plus historically connected adjacent coastal drainages, and smaller coastal basins grouped together on the basis of biogeographic criteria. Species diversity, endemism, noteworthy groups and state of knowledge of each basin complex are described. Marine habitats around South America, both coastal and oceanic, are also described in terms of fish diversity, endemism and state of knowledge. Because of extensive land use changes, hydroelectric damming, water divergence for irrigation, urbanization, sedimentation and overfishing 4-10% of all fish species in South America face some degree of extinction risk, mainly due to habitat loss and degradation. These figures suggest that the conservation status of South American freshwater fish faunas is better than in most other regions of the world, but the marine fishes are as threatened as elsewhere. Conserving the remarkable aquatic habitats and fishes of South America is a growing challenge in face of the rapid anthropogenic changes of the 21st century, and deserves attention from conservationists and policy makers.
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            Late Cretaceous vertebrates from bajo de Santa Rosa (Allen Formation), Río Negro province, Argentina, with the description of a new sauropod dinosaur (Titanosauridae)

            Analía Forasiepi, Agustín G. Martinelli (2004)
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              Sedimentary paleoenvironments of fossil platyrrhine localities, Miocene Pinturas Formation, Santa Cruz Province, Argentina

              Thomas Bown, Claudio Larriestra (1990)
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                Author and article information

                Journal
                Journal ID (publisher-id): aabc
                Title: Anais da Academia Brasileira de Ciências
                Abbreviated Title: An. Acad. Bras. Ciênc.
                Publisher: Academia Brasileira de Ciências (Rio de Janeiro, RJ, Brazil )
                ISSN (Print): 0001-3765
                ISSN (Electronic): 1678-2690
                Publication date (Print and electronic): 2021
                Volume: 93
                Issue: suppl 2
                Electronic Location Identifier: e20191438
                Affiliations
                [2] Buenos Aires Buenos Aires orgnameUniversidad Maimónides orgdiv1Fundación de Historia Natural “Félix de Azara” Argentina
                [1] Buenos Aires orgnameMuseo Argentino de Ciencias Naturales “Bernardino Rivadavia” orgdiv1Laboratorio de Anatomía Comparada y Evolución de los Vertebrados Argentina
                [3] Esquel Chubut orgnameUniversidad Nacional de La Patagonia San Juan Bosco/UNPSJB orgdiv1Laboratorio de Investigaciones en Evolución y Biodiversidad (LIEB-FCNyCS sede Esquel Argentina
                Article
                Publisher ID: S0001-37652021000401219 Publisher ID: S0001-3765(21)09300001219
                DOI: 10.1590/0001-3765202120191438
                SO-VID: fc863e48-73d2-4734-b9ad-0b91d31f39da
                License:

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                Date accepted : 24 September 2021
                Date received : 21 November 2019
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 61, Pages: 0
                Product

                SciELO Brazil

                Categories
                Subject: Paleontology

                ScienceOpen disciplines: Paleontology
                Keywords: Argentina,Percichthyidae,Calyptocephalellidae,Miocene,Collón Curá Formation,Patagonia
                Data availability:
                ScienceOpen disciplines: Paleontology
                Keywords: Argentina, Percichthyidae, Calyptocephalellidae, Miocene, Collón Curá Formation, Patagonia

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