Strengthening Western Gondwanan correlations: A Brazilian Dicynodont (Synapsida, Anomodontia) in the Middle Triassic of Namibia

Terrestrial Middle Triassic strata occur throughout continental Africa and are particularly well exposed in South Africa, Tanzania, Zambia, and Namibia. The youngest age for all these African deposits is widely accepted as early Middle Triassic (Anisian). Fossils collected recently from the uppermos...

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Autores principales: Abdala, F., Marsicano, C.A., Smith, R.M.H., Swart, R.
Formato: JOUR
Materias:
Dicynodontia
Middle Triassic
Namibia
Omingonde formation
Palaeobiogeography
Stahleckeria
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1342937X_v23_n3_p1151_Abdala
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_1342937X_v23_n3_p1151_Abdala2023-10-03T16:09:36Z Strengthening Western Gondwanan correlations: A Brazilian Dicynodont (Synapsida, Anomodontia) in the Middle Triassic of Namibia Abdala, F. Marsicano, C.A. Smith, R.M.H. Swart, R. Dicynodontia Middle Triassic Namibia Omingonde formation Palaeobiogeography Stahleckeria Terrestrial Middle Triassic strata occur throughout continental Africa and are particularly well exposed in South Africa, Tanzania, Zambia, and Namibia. The youngest age for all these African deposits is widely accepted as early Middle Triassic (Anisian). Fossils collected recently from the uppermost strata of the upper Omingonde Formation in Namibia highlighted the presence of Chiniquodon, a carnivorous cynodont previously only found in Ladinian-Carnian aged rocks of South America. In addition, work in progress indicates that a large archosaur, originally reported as Erythrosuchus, also discovered from levels close to the top of this unit, is in fact a rauisuchian, a group of archosaurs well known from Ladinian-Carnian beds of southern South America. Here we present the first record of the tuskless dicynodont Stahleckeria potens from the top of the upper Omingonde Formation in central Namibia. This taxon was up until now only known from the Ladinian Dinodontosaurus Assemblage Zone of the Santa Maria Formation in southern Brazil. Thus, compelling evidence for a Ladinian age for the upper levels of the upper Omingonde Formation is provided by two therapsid and one archosaur taxa. The tetrapod fauna of the upper Omingonde Formation partially fills the gap of the well-documented hiatus (Ladinian gap), prevalent throughout the Karoo basins of south and central Africa. The presence of the same therapsid taxa in the Namibian Waterberg Basin and the Paraná Basin of Brazil during Middle Triassic suggests that these basins were biogeographically linked through a series of interconnecting lowlands, with no major ecological, climatic and/or physical barriers. © 2012 International Association for Gondwana Research. Fil:Marsicano, C.A. 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_1342937X_v23_n3_p1151_Abdala
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Dicynodontia
Middle Triassic
Namibia
Omingonde formation
Palaeobiogeography
Stahleckeria
spellingShingle Dicynodontia
Middle Triassic
Namibia
Omingonde formation
Palaeobiogeography
Stahleckeria
Abdala, F.
Marsicano, C.A.
Smith, R.M.H.
Swart, R.
Strengthening Western Gondwanan correlations: A Brazilian Dicynodont (Synapsida, Anomodontia) in the Middle Triassic of Namibia
topic_facet Dicynodontia
Middle Triassic
Namibia
Omingonde formation
Palaeobiogeography
Stahleckeria
description Terrestrial Middle Triassic strata occur throughout continental Africa and are particularly well exposed in South Africa, Tanzania, Zambia, and Namibia. The youngest age for all these African deposits is widely accepted as early Middle Triassic (Anisian). Fossils collected recently from the uppermost strata of the upper Omingonde Formation in Namibia highlighted the presence of Chiniquodon, a carnivorous cynodont previously only found in Ladinian-Carnian aged rocks of South America. In addition, work in progress indicates that a large archosaur, originally reported as Erythrosuchus, also discovered from levels close to the top of this unit, is in fact a rauisuchian, a group of archosaurs well known from Ladinian-Carnian beds of southern South America. Here we present the first record of the tuskless dicynodont Stahleckeria potens from the top of the upper Omingonde Formation in central Namibia. This taxon was up until now only known from the Ladinian Dinodontosaurus Assemblage Zone of the Santa Maria Formation in southern Brazil. Thus, compelling evidence for a Ladinian age for the upper levels of the upper Omingonde Formation is provided by two therapsid and one archosaur taxa. The tetrapod fauna of the upper Omingonde Formation partially fills the gap of the well-documented hiatus (Ladinian gap), prevalent throughout the Karoo basins of south and central Africa. The presence of the same therapsid taxa in the Namibian Waterberg Basin and the Paraná Basin of Brazil during Middle Triassic suggests that these basins were biogeographically linked through a series of interconnecting lowlands, with no major ecological, climatic and/or physical barriers. © 2012 International Association for Gondwana Research.
format JOUR
author Abdala, F.
Marsicano, C.A.
Smith, R.M.H.
Swart, R.
author_facet Abdala, F.
Marsicano, C.A.
Smith, R.M.H.
Swart, R.
author_sort Abdala, F.
title Strengthening Western Gondwanan correlations: A Brazilian Dicynodont (Synapsida, Anomodontia) in the Middle Triassic of Namibia
title_short Strengthening Western Gondwanan correlations: A Brazilian Dicynodont (Synapsida, Anomodontia) in the Middle Triassic of Namibia
title_full Strengthening Western Gondwanan correlations: A Brazilian Dicynodont (Synapsida, Anomodontia) in the Middle Triassic of Namibia
title_fullStr Strengthening Western Gondwanan correlations: A Brazilian Dicynodont (Synapsida, Anomodontia) in the Middle Triassic of Namibia
title_full_unstemmed Strengthening Western Gondwanan correlations: A Brazilian Dicynodont (Synapsida, Anomodontia) in the Middle Triassic of Namibia
title_sort strengthening western gondwanan correlations: a brazilian dicynodont (synapsida, anomodontia) in the middle triassic of namibia
url http://hdl.handle.net/20.500.12110/paper_1342937X_v23_n3_p1151_Abdala
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AT marsicanoca strengtheningwesterngondwanancorrelationsabraziliandicynodontsynapsidaanomodontiainthemiddletriassicofnamibia
AT smithrmh strengtheningwesterngondwanancorrelationsabraziliandicynodontsynapsidaanomodontiainthemiddletriassicofnamibia
AT swartr strengtheningwesterngondwanancorrelationsabraziliandicynodontsynapsidaanomodontiainthemiddletriassicofnamibia
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