The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa

Autores
Abdala, Fernando; Benoit, Julien; Jasinoski, Sandra C.; Gaetano, Leandro Carlos; Day, Michael O.; Rubidge, Bruce S.
Año de publicación
2021
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Non-mammaliaform cynodonts were a widespread and successful group of advanced therapsids that arose in the early late Permian. The oldest described species are Charassognathus gracilis and Abdalodon diastematicus, both of which are known from single specimens from the Endothiodon Assemblage Zone (Tropidostoma-Gorgonops Subzone) of the Beaufort Group of the Main Karoo Basin, South Africa. Here we present two undescribed cynodont specimens from the same subzone, which comprise a second specimen of A. diastematicus and a new species of a small-bodied cynodont, housed at the palaeontological collections of the Council for Geosciences, Pretoria, South Africa and the Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa, respectively. Three of these four early cynodont specimens, excluding Charassognathus, were CT scanned using a Nikon Metrology XTH 225/320 LC dual source industrial CT system at the Evolutionary Studies Institute at the University of the Witwatersrand (Johannesburg, South Africa), enhancing the assessment of their craniodental morphology. Remarkable features of the new species include: the presence of a platform on the dentary, lateral to the lower postcanines; the absence of a masseteric fossa; two forms of sectorial postcanine teeth, whereby the anterior postcanines possess a posterior accessory cusp and the posterior postcanines have an additional anterior accessory cusp; and the presence of two small, canine-like postcanines in the dentary immediately distal to the canines. X-ray images of the new material of A. diastematicus suggest alternating dental replacement of the complex upper postcanines, which also seems to be the case for the lower incisors. A preliminary phylogeny retrieves Abdalodon as closely related to a monophyletic clade formed by the cosmopolitan Procynosuchus and the Russian Dvinia, whereas the new taxon and Charassognathus are successive sister species of remaining cynodonts.
Fil: Abdala, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
Fil: Benoit, Julien. University of the Witwatersrand; Sudáfrica
Fil: Jasinoski, Sandra C.. University of the Witwatersrand; Sudáfrica
Fil: Gaetano, Leandro Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Day, Michael O.. National Museum of Natural History; Estados Unidos
Fil: Rubidge, Bruce S.. University of the Witwatersrand; Sudáfrica
XII Congreso de la Asociación Paleontológica Argentina
Argentina
Asociación Paleontológica Argentina
Materia
Cynodonts
Late Permian
Karoo Basin
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/179003
Acceder
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network_name_str CONICET Digital (CONICET)
spelling The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South AfricaAbdala, FernandoBenoit, JulienJasinoski, Sandra C.Gaetano, Leandro CarlosDay, Michael O.Rubidge, Bruce S.CynodontsLate PermianKaroo Basinhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Non-mammaliaform cynodonts were a widespread and successful group of advanced therapsids that arose in the early late Permian. The oldest described species are Charassognathus gracilis and Abdalodon diastematicus, both of which are known from single specimens from the Endothiodon Assemblage Zone (Tropidostoma-Gorgonops Subzone) of the Beaufort Group of the Main Karoo Basin, South Africa. Here we present two undescribed cynodont specimens from the same subzone, which comprise a second specimen of A. diastematicus and a new species of a small-bodied cynodont, housed at the palaeontological collections of the Council for Geosciences, Pretoria, South Africa and the Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa, respectively. Three of these four early cynodont specimens, excluding Charassognathus, were CT scanned using a Nikon Metrology XTH 225/320 LC dual source industrial CT system at the Evolutionary Studies Institute at the University of the Witwatersrand (Johannesburg, South Africa), enhancing the assessment of their craniodental morphology. Remarkable features of the new species include: the presence of a platform on the dentary, lateral to the lower postcanines; the absence of a masseteric fossa; two forms of sectorial postcanine teeth, whereby the anterior postcanines possess a posterior accessory cusp and the posterior postcanines have an additional anterior accessory cusp; and the presence of two small, canine-like postcanines in the dentary immediately distal to the canines. X-ray images of the new material of A. diastematicus suggest alternating dental replacement of the complex upper postcanines, which also seems to be the case for the lower incisors. A preliminary phylogeny retrieves Abdalodon as closely related to a monophyletic clade formed by the cosmopolitan Procynosuchus and the Russian Dvinia, whereas the new taxon and Charassognathus are successive sister species of remaining cynodonts.Fil: Abdala, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; ArgentinaFil: Benoit, Julien. University of the Witwatersrand; SudáfricaFil: Jasinoski, Sandra C.. University of the Witwatersrand; SudáfricaFil: Gaetano, Leandro Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; ArgentinaFil: Day, Michael O.. National Museum of Natural History; Estados UnidosFil: Rubidge, Bruce S.. University of the Witwatersrand; SudáfricaXII Congreso de la Asociación Paleontológica ArgentinaArgentinaAsociación Paleontológica ArgentinaAsociación Paleontológica Argentina2021info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectCongresoJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/179003The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa; XII Congreso de la Asociación Paleontológica Argentina; Argentina; 2021; 1-12469-0228CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.peapaleontologica.org.ar/index.php/peapa/article/view/422Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:04:11Zoai:ri.conicet.gov.ar:11336/179003instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:04:11.965CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa
title The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa
spellingShingle The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa
Abdala, Fernando
Cynodonts
Late Permian
Karoo Basin
title_short The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa
title_full The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa
title_fullStr The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa
title_full_unstemmed The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa
title_sort The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa
dc.creator.none.fl_str_mv Abdala, Fernando
Benoit, Julien
Jasinoski, Sandra C.
Gaetano, Leandro Carlos
Day, Michael O.
Rubidge, Bruce S.
author Abdala, Fernando
author_facet Abdala, Fernando
Benoit, Julien
Jasinoski, Sandra C.
Gaetano, Leandro Carlos
Day, Michael O.
Rubidge, Bruce S.
author_role author
author2 Benoit, Julien
Jasinoski, Sandra C.
Gaetano, Leandro Carlos
Day, Michael O.
Rubidge, Bruce S.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Cynodonts
Late Permian
Karoo Basin
topic Cynodonts
Late Permian
Karoo Basin
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Non-mammaliaform cynodonts were a widespread and successful group of advanced therapsids that arose in the early late Permian. The oldest described species are Charassognathus gracilis and Abdalodon diastematicus, both of which are known from single specimens from the Endothiodon Assemblage Zone (Tropidostoma-Gorgonops Subzone) of the Beaufort Group of the Main Karoo Basin, South Africa. Here we present two undescribed cynodont specimens from the same subzone, which comprise a second specimen of A. diastematicus and a new species of a small-bodied cynodont, housed at the palaeontological collections of the Council for Geosciences, Pretoria, South Africa and the Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa, respectively. Three of these four early cynodont specimens, excluding Charassognathus, were CT scanned using a Nikon Metrology XTH 225/320 LC dual source industrial CT system at the Evolutionary Studies Institute at the University of the Witwatersrand (Johannesburg, South Africa), enhancing the assessment of their craniodental morphology. Remarkable features of the new species include: the presence of a platform on the dentary, lateral to the lower postcanines; the absence of a masseteric fossa; two forms of sectorial postcanine teeth, whereby the anterior postcanines possess a posterior accessory cusp and the posterior postcanines have an additional anterior accessory cusp; and the presence of two small, canine-like postcanines in the dentary immediately distal to the canines. X-ray images of the new material of A. diastematicus suggest alternating dental replacement of the complex upper postcanines, which also seems to be the case for the lower incisors. A preliminary phylogeny retrieves Abdalodon as closely related to a monophyletic clade formed by the cosmopolitan Procynosuchus and the Russian Dvinia, whereas the new taxon and Charassognathus are successive sister species of remaining cynodonts.
Fil: Abdala, Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
Fil: Benoit, Julien. University of the Witwatersrand; Sudáfrica
Fil: Jasinoski, Sandra C.. University of the Witwatersrand; Sudáfrica
Fil: Gaetano, Leandro Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
Fil: Day, Michael O.. National Museum of Natural History; Estados Unidos
Fil: Rubidge, Bruce S.. University of the Witwatersrand; Sudáfrica
XII Congreso de la Asociación Paleontológica Argentina
Argentina
Asociación Paleontológica Argentina
description Non-mammaliaform cynodonts were a widespread and successful group of advanced therapsids that arose in the early late Permian. The oldest described species are Charassognathus gracilis and Abdalodon diastematicus, both of which are known from single specimens from the Endothiodon Assemblage Zone (Tropidostoma-Gorgonops Subzone) of the Beaufort Group of the Main Karoo Basin, South Africa. Here we present two undescribed cynodont specimens from the same subzone, which comprise a second specimen of A. diastematicus and a new species of a small-bodied cynodont, housed at the palaeontological collections of the Council for Geosciences, Pretoria, South Africa and the Evolutionary Studies Institute, University of the Witwatersrand, Johannesburg, South Africa, respectively. Three of these four early cynodont specimens, excluding Charassognathus, were CT scanned using a Nikon Metrology XTH 225/320 LC dual source industrial CT system at the Evolutionary Studies Institute at the University of the Witwatersrand (Johannesburg, South Africa), enhancing the assessment of their craniodental morphology. Remarkable features of the new species include: the presence of a platform on the dentary, lateral to the lower postcanines; the absence of a masseteric fossa; two forms of sectorial postcanine teeth, whereby the anterior postcanines possess a posterior accessory cusp and the posterior postcanines have an additional anterior accessory cusp; and the presence of two small, canine-like postcanines in the dentary immediately distal to the canines. X-ray images of the new material of A. diastematicus suggest alternating dental replacement of the complex upper postcanines, which also seems to be the case for the lower incisors. A preliminary phylogeny retrieves Abdalodon as closely related to a monophyletic clade formed by the cosmopolitan Procynosuchus and the Russian Dvinia, whereas the new taxon and Charassognathus are successive sister species of remaining cynodonts.
publishDate 2021
dc.date.none.fl_str_mv 2021
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Congreso
Journal
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/179003
The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa; XII Congreso de la Asociación Paleontológica Argentina; Argentina; 2021; 1-1
2469-0228
CONICET Digital
CONICET
url http://hdl.handle.net/11336/179003
identifier_str_mv The earliest cynodont therapsids from the Late Permian of the Karoo Basin, South Africa; XII Congreso de la Asociación Paleontológica Argentina; Argentina; 2021; 1-1
2469-0228
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.peapaleontologica.org.ar/index.php/peapa/article/view/422
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv Asociación Paleontológica Argentina
publisher.none.fl_str_mv Asociación Paleontológica Argentina
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
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instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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