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

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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Autor principal:	Rougier, Guillermo Walter
Publicado:	2012
Materias:	Argentina Cañadón Asfalto Central Gondwanan Desert Gondwana Middle Jurassic Ontogeny Palaeobiogeography Rhynchocephalia Sphenodontia Successional dentition Lepidosauria
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244082_v166_n2_p342_Apesteguia 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

id	paper:paper_00244082_v166_n2_p342_Apesteguia
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spelling	paper:paper_00244082_v166_n2_p342_Apesteguia2023-06-08T14:52:24Z A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: New insights on the phylogeny and biogeography of Gondwanan rhynchocephalians Rougier, Guillermo Walter 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 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244082_v166_n2_p342_Apesteguia 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)
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 Rougier, Guillermo Walter 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.
author	Rougier, Guillermo Walter
author_facet	Rougier, Guillermo Walter
author_sort	Rougier, Guillermo Walter
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	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00244082_v166_n2_p342_Apesteguia http://hdl.handle.net/20.500.12110/paper_00244082_v166_n2_p342_Apesteguia
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A basal sphenodontian (Lepidosauria) from the Jurassic of Patagonia: New insights on the phylogeny and biogeography of Gondwanan rhynchocephalians

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