A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia
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 muc...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_10948074_v16_n1_p1_LopezArbarello |
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todo:paper_10948074_v16_n1_p1_LopezArbarello2023-10-03T16:05:17Z A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia López-Arbarello, A. Sferco, E. Rauhut, O.W.M. 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 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. Fil:López-Arbarello, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Sferco, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_10948074_v16_n1_p1_LopezArbarello |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 López-Arbarello, A. Sferco, E. Rauhut, O.W.M. A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
López-Arbarello, A. Sferco, E. Rauhut, O.W.M. |
| author_facet |
López-Arbarello, A. Sferco, E. Rauhut, O.W.M. |
| author_sort |
López-Arbarello, A. |
| title |
A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia |
| title_short |
A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia |
| title_full |
A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia |
| title_fullStr |
A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia |
| title_full_unstemmed |
A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia |
| title_sort |
new genus of coccolepidid fishes (actinopterygii, chondrostei) from the continental jurassic of patagonia |
| url |
http://hdl.handle.net/20.500.12110/paper_10948074_v16_n1_p1_LopezArbarello |
| work_keys_str_mv |
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| _version_ |
1807324254930206720 |