The African cynodont Aleodon (Cynodontia, Probainognathia) in the Triassic of southern Brazil and its biostratigraphic significance
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/224731 |
Resumo: | In this contribution we report the first occurrence of the enigmatic African probainognathian genus Aleodon in the Middle-early Late Triassic of several localities from the state of Rio Grande do Sul in southern Brazil. Aleodon is unusual among early probainognathians in having transversely-expanded postcanine teeth, similar to those of gomphodont cynognathians. This genus was previously known from the Manda Beds of Tanzania and the upper Omingonde Formation of Namibia. The Brazilian record of this genus is based upon multiple specimens representing different ontogenetic stages, including three that were previously referred to the sectorial-toothed probainognathian Chiniquodon theotonicus. We propose a new species of Aleodon (A. cromptoni sp. nov.) based on the specimens from Brazil. Additionally, we tentatively refer one specimen from the upper Omingonde Formation of Namibia to this new taxon, strengthening biostratigraphic correlations between these strata. Inclusion of A. cromptoni in a phylogenetic analysis of eucynodonts recovers it as the sister-taxon of A. brachyrhamphus within the family Chiniquodontidae. The discovery of numerous specimens of Aleodon among the supposedly monospecific Chiniquodon samples of Brazil raises concerns about chiniquodontid alpha taxonomy, particularly given the extremely broad geographic distribution of Chiniquodon. The discovery of Brazilian Aleodon and new records of the traversodontid Luangwa supports the hypothesis that at least two subzones can be recognized in the Dinodontosaurus Assemblage Zone. |
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Martinelli, Agustín GuillermoKammerer, Christian F.Melo, Tomaz PanceriPaes Neto, Voltaire DutraRibeiro, Ana MariaRosa, Atila Augusto Stock daSchultz, Cesar LeandroSoares, Marina Bento2021-07-29T04:30:44Z20171932-6203http://hdl.handle.net/10183/224731001048922In this contribution we report the first occurrence of the enigmatic African probainognathian genus Aleodon in the Middle-early Late Triassic of several localities from the state of Rio Grande do Sul in southern Brazil. Aleodon is unusual among early probainognathians in having transversely-expanded postcanine teeth, similar to those of gomphodont cynognathians. This genus was previously known from the Manda Beds of Tanzania and the upper Omingonde Formation of Namibia. The Brazilian record of this genus is based upon multiple specimens representing different ontogenetic stages, including three that were previously referred to the sectorial-toothed probainognathian Chiniquodon theotonicus. We propose a new species of Aleodon (A. cromptoni sp. nov.) based on the specimens from Brazil. Additionally, we tentatively refer one specimen from the upper Omingonde Formation of Namibia to this new taxon, strengthening biostratigraphic correlations between these strata. Inclusion of A. cromptoni in a phylogenetic analysis of eucynodonts recovers it as the sister-taxon of A. brachyrhamphus within the family Chiniquodontidae. The discovery of numerous specimens of Aleodon among the supposedly monospecific Chiniquodon samples of Brazil raises concerns about chiniquodontid alpha taxonomy, particularly given the extremely broad geographic distribution of Chiniquodon. The discovery of Brazilian Aleodon and new records of the traversodontid Luangwa supports the hypothesis that at least two subzones can be recognized in the Dinodontosaurus Assemblage Zone.application/pdfengPLOS ONE. San Francisco, California, US. Vol. 12, no. 6 (June 2017), e0177948, 54 p.FilogenéticaTriassico medioAfloramentoReconstrução fóssilRio Grande do SulThe African cynodont Aleodon (Cynodontia, Probainognathia) in the Triassic of southern Brazil and its biostratigraphic significanceEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001048922.pdf.txt001048922.pdf.txtExtracted Texttext/plain157852http://www.lume.ufrgs.br/bitstream/10183/224731/2/001048922.pdf.txted0f53505611f215ead92db7ea96d954MD52ORIGINAL001048922.pdfTexto completo (inglês)application/pdf148941631http://www.lume.ufrgs.br/bitstream/10183/224731/1/001048922.pdf7853bb0702d9b04977662eed442dbfa7MD5110183/2247312023-09-23 03:36:26.578324oai:www.lume.ufrgs.br:10183/224731Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-09-23T06:36:26Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
The African cynodont Aleodon (Cynodontia, Probainognathia) in the Triassic of southern Brazil and its biostratigraphic significance |
title |
The African cynodont Aleodon (Cynodontia, Probainognathia) in the Triassic of southern Brazil and its biostratigraphic significance |
spellingShingle |
The African cynodont Aleodon (Cynodontia, Probainognathia) in the Triassic of southern Brazil and its biostratigraphic significance Martinelli, Agustín Guillermo Filogenética Triassico medio Afloramento Reconstrução fóssil Rio Grande do Sul |
title_short |
The African cynodont Aleodon (Cynodontia, Probainognathia) in the Triassic of southern Brazil and its biostratigraphic significance |
title_full |
The African cynodont Aleodon (Cynodontia, Probainognathia) in the Triassic of southern Brazil and its biostratigraphic significance |
title_fullStr |
The African cynodont Aleodon (Cynodontia, Probainognathia) in the Triassic of southern Brazil and its biostratigraphic significance |
title_full_unstemmed |
The African cynodont Aleodon (Cynodontia, Probainognathia) in the Triassic of southern Brazil and its biostratigraphic significance |
title_sort |
The African cynodont Aleodon (Cynodontia, Probainognathia) in the Triassic of southern Brazil and its biostratigraphic significance |
author |
Martinelli, Agustín Guillermo |
author_facet |
Martinelli, Agustín Guillermo Kammerer, Christian F. Melo, Tomaz Panceri Paes Neto, Voltaire Dutra Ribeiro, Ana Maria Rosa, Atila Augusto Stock da Schultz, Cesar Leandro Soares, Marina Bento |
author_role |
author |
author2 |
Kammerer, Christian F. Melo, Tomaz Panceri Paes Neto, Voltaire Dutra Ribeiro, Ana Maria Rosa, Atila Augusto Stock da Schultz, Cesar Leandro Soares, Marina Bento |
author2_role |
author author author author author author author |
dc.contributor.author.fl_str_mv |
Martinelli, Agustín Guillermo Kammerer, Christian F. Melo, Tomaz Panceri Paes Neto, Voltaire Dutra Ribeiro, Ana Maria Rosa, Atila Augusto Stock da Schultz, Cesar Leandro Soares, Marina Bento |
dc.subject.por.fl_str_mv |
Filogenética Triassico medio Afloramento Reconstrução fóssil Rio Grande do Sul |
topic |
Filogenética Triassico medio Afloramento Reconstrução fóssil Rio Grande do Sul |
description |
In this contribution we report the first occurrence of the enigmatic African probainognathian genus Aleodon in the Middle-early Late Triassic of several localities from the state of Rio Grande do Sul in southern Brazil. Aleodon is unusual among early probainognathians in having transversely-expanded postcanine teeth, similar to those of gomphodont cynognathians. This genus was previously known from the Manda Beds of Tanzania and the upper Omingonde Formation of Namibia. The Brazilian record of this genus is based upon multiple specimens representing different ontogenetic stages, including three that were previously referred to the sectorial-toothed probainognathian Chiniquodon theotonicus. We propose a new species of Aleodon (A. cromptoni sp. nov.) based on the specimens from Brazil. Additionally, we tentatively refer one specimen from the upper Omingonde Formation of Namibia to this new taxon, strengthening biostratigraphic correlations between these strata. Inclusion of A. cromptoni in a phylogenetic analysis of eucynodonts recovers it as the sister-taxon of A. brachyrhamphus within the family Chiniquodontidae. The discovery of numerous specimens of Aleodon among the supposedly monospecific Chiniquodon samples of Brazil raises concerns about chiniquodontid alpha taxonomy, particularly given the extremely broad geographic distribution of Chiniquodon. The discovery of Brazilian Aleodon and new records of the traversodontid Luangwa supports the hypothesis that at least two subzones can be recognized in the Dinodontosaurus Assemblage Zone. |
publishDate |
2017 |
dc.date.issued.fl_str_mv |
2017 |
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2021-07-29T04:30:44Z |
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http://hdl.handle.net/10183/224731 |
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1932-6203 |
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001048922 |
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http://hdl.handle.net/10183/224731 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
PLOS ONE. San Francisco, California, US. Vol. 12, no. 6 (June 2017), e0177948, 54 p. |
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