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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Autores principales:	López Arbarello, Adriana, Sferco, Marta Emilia
Publicado:	2013
Materias:	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 Uruguay Acipenseriformes Actinopterygii Pisces Teleostei
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10948074_v16_n1_p1_LopezArbarello http://hdl.handle.net/20.500.12110/paper_10948074_v16_n1_p1_LopezArbarello
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_10948074_v16_n1_p1_LopezArbarello
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spelling	paper:paper_10948074_v16_n1_p1_LopezArbarello2023-06-08T16:06:58Z A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia López Arbarello, Adriana Sferco, Marta Emilia 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. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10948074_v16_n1_p1_LopezArbarello 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, Adriana Sferco, Marta Emilia 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.
author	López Arbarello, Adriana Sferco, Marta Emilia
author_facet	López Arbarello, Adriana Sferco, Marta Emilia
author_sort	López Arbarello, Adriana
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
publishDate	2013
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10948074_v16_n1_p1_LopezArbarello http://hdl.handle.net/20.500.12110/paper_10948074_v16_n1_p1_LopezArbarello
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_version_	1768542376391868416

A new genus of coccolepidid fishes (Actinopterygii, Chondrostei) from the continental Jurassic of Patagonia

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