New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications

Autores
Gaetano, Leandro Carlos; Martínez, Ricardo; Abdala, Nestor Fernando
Año de publicación
2019
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Exaeretodon is a very abundant non-mammalian cynodont from the Upper Triassic found in South America and India. Presently, two species are considered valid: E. argentinus (Cabrera, 1943) from Argentina and E. riograndensis Abdala et al. 2002 from Brazil. We studied several unpublished specimens tentatively assigned to E. argentinus from the Ischigualasto Fm. (San Juan Province, Argentina) that range from ~130mm to ~400mm in basal skull length. Regardless of the individual size, two morphotypes were identified on the basis of differences in the zygomatic region, including: the presence/absence of a process of the jugal; the shape, relative orientation, and posterior extension of the dorsal and ventral zygomatic rami of the jugal; and the morphology and orientation of the zygomatic portion of the squamosal. The holotype of E. argentinus (formerly Belesodon argentinus Cabrera, 1943) is an incomplete left lower jaw. Only the holotypes of the once valid E. frenguelli Cabrera, 1943 and Theropsis robusta Cabrera, 1943 (presently considered junior synonyms of E. argentinus) and E. riograndensis preserve the relevant portions of the zygomatic region. These specimens represent only one of the morphotypes whereas the second morphotype has not been previously recognized. In addition, there are differences among the specimens of the first morphotype that were originally interpreted to be due to preservational artifacts but could instead account for intraspecific variation. Our preliminary results suggest that the second morphotype might characterize a new taxon, highlighting the importance of an integral re-evaluation of Exaeretodon Cabrera, 1943 considering all the evidence available.
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: Martínez, Ricardo. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina
Fil: Abdala, Nestor Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
Reunión de Comunicaciones de la Asociación Paleontológica Argentina
Puerto Madryn
Argentina
Asociación Paleontológica Argentina
Materia
ANATOMY
CYNODONT
ISCHIGUALASTO
TRIASSIC
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:11336/153821
Acceder
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network_name_str CONICET Digital (CONICET)
spelling New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implicationsGaetano, Leandro CarlosMartínez, RicardoAbdala, Nestor FernandoANATOMYCYNODONTISCHIGUALASTOTRIASSIChttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Exaeretodon is a very abundant non-mammalian cynodont from the Upper Triassic found in South America and India. Presently, two species are considered valid: E. argentinus (Cabrera, 1943) from Argentina and E. riograndensis Abdala et al. 2002 from Brazil. We studied several unpublished specimens tentatively assigned to E. argentinus from the Ischigualasto Fm. (San Juan Province, Argentina) that range from ~130mm to ~400mm in basal skull length. Regardless of the individual size, two morphotypes were identified on the basis of differences in the zygomatic region, including: the presence/absence of a process of the jugal; the shape, relative orientation, and posterior extension of the dorsal and ventral zygomatic rami of the jugal; and the morphology and orientation of the zygomatic portion of the squamosal. The holotype of E. argentinus (formerly Belesodon argentinus Cabrera, 1943) is an incomplete left lower jaw. Only the holotypes of the once valid E. frenguelli Cabrera, 1943 and Theropsis robusta Cabrera, 1943 (presently considered junior synonyms of E. argentinus) and E. riograndensis preserve the relevant portions of the zygomatic region. These specimens represent only one of the morphotypes whereas the second morphotype has not been previously recognized. In addition, there are differences among the specimens of the first morphotype that were originally interpreted to be due to preservational artifacts but could instead account for intraspecific variation. Our preliminary results suggest that the second morphotype might characterize a new taxon, highlighting the importance of an integral re-evaluation of Exaeretodon Cabrera, 1943 considering all the evidence available.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"; ArgentinaFil: Martínez, Ricardo. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; ArgentinaFil: Abdala, Nestor Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; ArgentinaReunión de Comunicaciones de la Asociación Paleontológica ArgentinaPuerto MadrynArgentinaAsociación Paleontológica ArgentinaAsociación Paleontológica Argentina2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/153821New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications; Reunión de Comunicaciones de la Asociación Paleontológica Argentina; Puerto Madryn; Argentina; 2018; 1-12469-0228CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.peapaleontologica.org.ar/index.php/peapa/article/view/296/354Nacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:02:33Zoai:ri.conicet.gov.ar:11336/153821instacron: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:34982025-10-15 15:02:33.782CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications
title New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications
spellingShingle New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications
Gaetano, Leandro Carlos
ANATOMY
CYNODONT
ISCHIGUALASTO
TRIASSIC
title_short New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications
title_full New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications
title_fullStr New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications
title_full_unstemmed New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications
title_sort New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications
dc.creator.none.fl_str_mv Gaetano, Leandro Carlos
Martínez, Ricardo
Abdala, Nestor Fernando
author Gaetano, Leandro Carlos
author_facet Gaetano, Leandro Carlos
Martínez, Ricardo
Abdala, Nestor Fernando
author_role author
author2 Martínez, Ricardo
Abdala, Nestor Fernando
author2_role author
author
dc.subject.none.fl_str_mv ANATOMY
CYNODONT
ISCHIGUALASTO
TRIASSIC
topic ANATOMY
CYNODONT
ISCHIGUALASTO
TRIASSIC
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Exaeretodon is a very abundant non-mammalian cynodont from the Upper Triassic found in South America and India. Presently, two species are considered valid: E. argentinus (Cabrera, 1943) from Argentina and E. riograndensis Abdala et al. 2002 from Brazil. We studied several unpublished specimens tentatively assigned to E. argentinus from the Ischigualasto Fm. (San Juan Province, Argentina) that range from ~130mm to ~400mm in basal skull length. Regardless of the individual size, two morphotypes were identified on the basis of differences in the zygomatic region, including: the presence/absence of a process of the jugal; the shape, relative orientation, and posterior extension of the dorsal and ventral zygomatic rami of the jugal; and the morphology and orientation of the zygomatic portion of the squamosal. The holotype of E. argentinus (formerly Belesodon argentinus Cabrera, 1943) is an incomplete left lower jaw. Only the holotypes of the once valid E. frenguelli Cabrera, 1943 and Theropsis robusta Cabrera, 1943 (presently considered junior synonyms of E. argentinus) and E. riograndensis preserve the relevant portions of the zygomatic region. These specimens represent only one of the morphotypes whereas the second morphotype has not been previously recognized. In addition, there are differences among the specimens of the first morphotype that were originally interpreted to be due to preservational artifacts but could instead account for intraspecific variation. Our preliminary results suggest that the second morphotype might characterize a new taxon, highlighting the importance of an integral re-evaluation of Exaeretodon Cabrera, 1943 considering all the evidence available.
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: Martínez, Ricardo. Universidad Nacional de San Juan. Facultad de Ciencias Exactas Físicas y Naturales. Instituto y Museo de Ciencias Naturales. Área de Paleontología de Vertebrados; Argentina
Fil: Abdala, Nestor Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina
Reunión de Comunicaciones de la Asociación Paleontológica Argentina
Puerto Madryn
Argentina
Asociación Paleontológica Argentina
description Exaeretodon is a very abundant non-mammalian cynodont from the Upper Triassic found in South America and India. Presently, two species are considered valid: E. argentinus (Cabrera, 1943) from Argentina and E. riograndensis Abdala et al. 2002 from Brazil. We studied several unpublished specimens tentatively assigned to E. argentinus from the Ischigualasto Fm. (San Juan Province, Argentina) that range from ~130mm to ~400mm in basal skull length. Regardless of the individual size, two morphotypes were identified on the basis of differences in the zygomatic region, including: the presence/absence of a process of the jugal; the shape, relative orientation, and posterior extension of the dorsal and ventral zygomatic rami of the jugal; and the morphology and orientation of the zygomatic portion of the squamosal. The holotype of E. argentinus (formerly Belesodon argentinus Cabrera, 1943) is an incomplete left lower jaw. Only the holotypes of the once valid E. frenguelli Cabrera, 1943 and Theropsis robusta Cabrera, 1943 (presently considered junior synonyms of E. argentinus) and E. riograndensis preserve the relevant portions of the zygomatic region. These specimens represent only one of the morphotypes whereas the second morphotype has not been previously recognized. In addition, there are differences among the specimens of the first morphotype that were originally interpreted to be due to preservational artifacts but could instead account for intraspecific variation. Our preliminary results suggest that the second morphotype might characterize a new taxon, highlighting the importance of an integral re-evaluation of Exaeretodon Cabrera, 1943 considering all the evidence available.
publishDate 2019
dc.date.none.fl_str_mv 2019
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Reunión
Book
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/11336/153821
New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications; Reunión de Comunicaciones de la Asociación Paleontológica Argentina; Puerto Madryn; Argentina; 2018; 1-1
2469-0228
CONICET Digital
CONICET
url http://hdl.handle.net/11336/153821
identifier_str_mv New insights on the cranial anatomy of Exaeretodon: intraspecific variation and taxonomic implications; Reunión de Comunicaciones de la Asociación Paleontológica Argentina; Puerto Madryn; Argentina; 2018; 1-1
2469-0228
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
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dc.format.none.fl_str_mv application/pdf
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dc.coverage.none.fl_str_mv Nacional
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)
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repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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