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Abstract:

Jurassic freshwater fish faunas are still poorly known, with the only assemblage of that age known from southern South America being the "Almada fauna" of the Cañadón Calcáreo Formation (Oxfordian-Tithonian) of Chubut, Argentina. This fauna is composed mainly by abundant teleosts and a much rarer basal actinopterygian, originally described as †Oligopleurus groeberi and currently usually placed in the genus †Coccolepis. This taxon is here redescribed on the basis of the original specimens and more numerous and better preserved new material from several localities within the Cañadón Calcáreo Formation. The species shows several differences to other coccolepidid taxa, including the apomorphic presence of a sensory canal in the gular plate, and cannot be referred to a known genus. Thus, a new genus name, †Condorlepis gen. nov., is proposed. The detailed anatomical description of †Condorlepis gen. nov. groeberi provides further evidence for the chondrostean affinities of the Coccolepididae and their close relationships with the Acipenseriformes, since this species shows six characters that were hitherto considered to be autapomorphies of the latter clade. A comparison of the Almada fauna with other Gondwanan Jurassic freshwater fish faunas shows close similarities with the roughly contemporaneous fauna of Talbragar, Australia, which also includes an abundant basal teleost and coccolepidids. In contrast, there are marked differences with the faunas of the Early to Middle Jurassic Kota Formation of India, the Late Jurassic to Early Cretaceous Stanleyville beds of the Democratic Republic of the Congo, and the probably Late Jurassic Tacuarembó Formation of Uruguay, in which basal, non-teleostean neopterygians and sarcopterygians are abundant. © Palaeontological Association February 2013.

Registro:

Documento: Artículo
Título:A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia
Autor:López-Arbarello, A.; Sferco, E.; Rauhut, O.W.M.
Filiación:Bayerische Staatssammlung für Paläontologie und Geologie, Richard-Wagner- Strasse 10, D-80333 München, Germany
Museo Paleontológico Egidio Feruglio, Av. Fontana 140, 9100 Trelew, Argentina
Laboratorio de Paleontología Evolutiva de Vertebrados, Departamento de Geología, Universidad de Buenos Aires, Ciudad Unive., Pabellón II, 1428 Buenos Aires, Argentina
Department of Earth and Environmental Sciences and GeoBioCenter, Ludwig-Maximilians-University, Richard-Wagner-Strasse 10, 80333 Munich, Germany
Palabras clave:Chondrostei; Coccolepididae; Freshwater fishes; New genus; Patagonia; Upper Jurassic; abundance; fish; fossil assemblage; Jurassic; new genus; paleontology; taxonomy; teleost; Argentina; Chubut; Democratic Republic Congo; India; Patagonia; Uruguay; Acipenseriformes; Actinopterygii; Chondrostei; Pisces; Teleostei
Año:2013
Volumen:16
Número:1
Página de inicio:1
Página de fin:23
Título revista:Palaeontologia Electronica
Título revista abreviado:Palaeontol. Electron.
ISSN:10948074
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10948074_v16_n1_p1_LopezArbarello

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Citas:

---------- APA ----------
López-Arbarello, A., Sferco, E. & Rauhut, O.W.M. (2013) . A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia. Palaeontologia Electronica, 16(1), 1-23.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10948074_v16_n1_p1_LopezArbarello [ ]
---------- CHICAGO ----------
López-Arbarello, A., Sferco, E., Rauhut, O.W.M. "A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia" . Palaeontologia Electronica 16, no. 1 (2013) : 1-23.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10948074_v16_n1_p1_LopezArbarello [ ]
---------- MLA ----------
López-Arbarello, A., Sferco, E., Rauhut, O.W.M. "A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia" . Palaeontologia Electronica, vol. 16, no. 1, 2013, pp. 1-23.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10948074_v16_n1_p1_LopezArbarello [ ]
---------- VANCOUVER ----------
López-Arbarello, A., Sferco, E., Rauhut, O.W.M. A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia. Palaeontol. Electron. 2013;16(1):1-23.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10948074_v16_n1_p1_LopezArbarello [ ]