A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: New insights on the phylogeny and biogeography of Gondwanan rhynchocephalians

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Herein we describe a new rhynchocephalian taxon from the Middle Jurassic of Patagonia, Argentina, representing the first Jurassic record of the group in South America. The new taxon, consisting of a complete dentary, is ascribed to Sphenodontia based on the presence of a deep and wide Meckelian groo...

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Autores principales: Apesteguía, S., Gómez, R.O., Rougier, G.W.
Formato: Artículo publishedVersion
Lenguaje:Inglés
Publicado: 2012
Materias:
Argentina
Cañadón Asfalto
Central Gondwanan Desert
Gondwana
Middle Jurassic
Ontogeny
Palaeobiogeography
Rhynchocephalia
Sphenodontia
Successional dentition
Lepidosauria
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00244082_v166_n2_p342_Apesteguia
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paperaa:paper_00244082_v166_n2_p342_Apesteguia2023-06-12T16:45:04Z A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: New insights on the phylogeny and biogeography of Gondwanan rhynchocephalians Zool. J. Linn. Soc. 2012;166(2):342-360 Apesteguía, S. Gómez, R.O. Rougier, G.W. Argentina Cañadón Asfalto Central Gondwanan Desert Gondwana Middle Jurassic Ontogeny Palaeobiogeography Rhynchocephalia Sphenodontia Successional dentition Lepidosauria Sphenodontia Herein we describe a new rhynchocephalian taxon from the Middle Jurassic of Patagonia, Argentina, representing the first Jurassic record of the group in South America. The new taxon, consisting of a complete dentary, is ascribed to Sphenodontia based on the presence of a deep and wide Meckelian groove, long posterior process, well-developed coronoid process, and acrodont teeth showing dental regionalization including successional, alternate hatchling, and additional series. This allocation is reinforced by a phylogenetic analysis that places the new taxon in a basal position within a clade of sphenodontians that excludes Diphydontosaurus and Planocephalosaurus. Additionally, the new taxon clusters within a Gondwanan clade with the Indian Godavarisaurus from the Jurassic Kota Formation, sharing the presence of recurved and relatively large posterior successional teeth that are ribbed and bear a peculiar anterolingual groove. This sister-group relationship is intriguing from a palaeobiogeographical viewpoint, as it suggests some degree of endemism during the initial stages of the breakup of Pangaea. We also discuss the ontogenetic stage of the new taxon and provide insights on the evolution of successional dentition in rhynchocephalians. © 2012 The Linnean Society of London. Fil:Rougier, G.W. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion application/pdf eng info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00244082_v166_n2_p342_Apesteguia
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language Inglés
orig_language_str_mv eng
topic Argentina
Cañadón Asfalto
Central Gondwanan Desert
Gondwana
Middle Jurassic
Ontogeny
Palaeobiogeography
Rhynchocephalia
Sphenodontia
Successional dentition
Lepidosauria
Sphenodontia
spellingShingle Argentina
Cañadón Asfalto
Central Gondwanan Desert
Gondwana
Middle Jurassic
Ontogeny
Palaeobiogeography
Rhynchocephalia
Sphenodontia
Successional dentition
Lepidosauria
Sphenodontia
Apesteguía, S.
Gómez, R.O.
Rougier, G.W.
A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: New insights on the phylogeny and biogeography of Gondwanan rhynchocephalians
topic_facet Argentina
Cañadón Asfalto
Central Gondwanan Desert
Gondwana
Middle Jurassic
Ontogeny
Palaeobiogeography
Rhynchocephalia
Sphenodontia
Successional dentition
Lepidosauria
Sphenodontia
description Herein we describe a new rhynchocephalian taxon from the Middle Jurassic of Patagonia, Argentina, representing the first Jurassic record of the group in South America. The new taxon, consisting of a complete dentary, is ascribed to Sphenodontia based on the presence of a deep and wide Meckelian groove, long posterior process, well-developed coronoid process, and acrodont teeth showing dental regionalization including successional, alternate hatchling, and additional series. This allocation is reinforced by a phylogenetic analysis that places the new taxon in a basal position within a clade of sphenodontians that excludes Diphydontosaurus and Planocephalosaurus. Additionally, the new taxon clusters within a Gondwanan clade with the Indian Godavarisaurus from the Jurassic Kota Formation, sharing the presence of recurved and relatively large posterior successional teeth that are ribbed and bear a peculiar anterolingual groove. This sister-group relationship is intriguing from a palaeobiogeographical viewpoint, as it suggests some degree of endemism during the initial stages of the breakup of Pangaea. We also discuss the ontogenetic stage of the new taxon and provide insights on the evolution of successional dentition in rhynchocephalians. © 2012 The Linnean Society of London.
format Artículo
Artículo
publishedVersion
author Apesteguía, S.
Gómez, R.O.
Rougier, G.W.
author_facet Apesteguía, S.
Gómez, R.O.
Rougier, G.W.
author_sort Apesteguía, S.
title A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: New insights on the phylogeny and biogeography of Gondwanan rhynchocephalians
title_short A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: New insights on the phylogeny and biogeography of Gondwanan rhynchocephalians
title_full A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: New insights on the phylogeny and biogeography of Gondwanan rhynchocephalians
title_fullStr A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: New insights on the phylogeny and biogeography of Gondwanan rhynchocephalians
title_full_unstemmed A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: New insights on the phylogeny and biogeography of Gondwanan rhynchocephalians
title_sort basal sphenodontian (lepidosauria) from the jurassic of patagonia: new insights on the phylogeny and biogeography of gondwanan rhynchocephalians
publishDate 2012
url http://hdl.handle.net/20.500.12110/paper_00244082_v166_n2_p342_Apesteguia
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