Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence

Autores
Abdala, Nestor Fernando; Giannini, Norberto Pedro
Año de publicación
2000
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A revision of gomphodont cynodonts from the Chan?ares Formation of Argentina, is presented. Four species in two genera: Massetognathus pascuali, M. teruggii, M. major, and Megagomphodon oligodens were originally described by Romer in 1967 and 1972. Qualitative characters proposed originally as diagnostic of the species were revised, and a bivariate analysis of allometry of 17 linear skull measurements was performed upon 31 specimens. Allometry relationships account for most of the differences among specimens. There are neither size gaps nor systematic trends across the sample. The temporal region scales with a positive allometry, whereas components of the neurocranium and muzzle show negative or isometric scaling. This results in a change from short, stocky skulls with large
muzzles in small specimens, to slender skulls with small muzzles and large temporal fossae characteristic of large individuals. The reduction and ontogenetic loss of the parietal foramen in a cynodont is reported for the first time. Consideration of qualitative characters together with the allometric results lead us to conclude that all forms belong to a single species in a growth series. Consequently, Massetognathus pascuali is recognized as the only valid entity, an idea previously suggested but without a justification based upon extensive analysis.
Fil: Abdala, Nestor Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Pontificia Universidade Católica do Rio Grande do Sul; Brasil. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo; Argentina
Fil: Giannini, Norberto Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Programa de Investigación de Biodiversidad Argentina; Argentina
Materia
Ontogeny
Middle Triassic
Traversodontid Cynodont
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/79120
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequenceAbdala, Nestor FernandoGiannini, Norberto PedroOntogenyMiddle TriassicTraversodontid Cynodonthttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1A revision of gomphodont cynodonts from the Chan?ares Formation of Argentina, is presented. Four species in two genera: Massetognathus pascuali, M. teruggii, M. major, and Megagomphodon oligodens were originally described by Romer in 1967 and 1972. Qualitative characters proposed originally as diagnostic of the species were revised, and a bivariate analysis of allometry of 17 linear skull measurements was performed upon 31 specimens. Allometry relationships account for most of the differences among specimens. There are neither size gaps nor systematic trends across the sample. The temporal region scales with a positive allometry, whereas components of the neurocranium and muzzle show negative or isometric scaling. This results in a change from short, stocky skulls with large<br />muzzles in small specimens, to slender skulls with small muzzles and large temporal fossae characteristic of large individuals. The reduction and ontogenetic loss of the parietal foramen in a cynodont is reported for the first time. Consideration of qualitative characters together with the allometric results lead us to conclude that all forms belong to a single species in a growth series. Consequently, Massetognathus pascuali is recognized as the only valid entity, an idea previously suggested but without a justification based upon extensive analysis.Fil: Abdala, Nestor Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Pontificia Universidade Católica do Rio Grande do Sul; Brasil. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo; ArgentinaFil: Giannini, Norberto Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Programa de Investigación de Biodiversidad Argentina; ArgentinaSociety of Vertebrate Paleontology2000-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/79120Abdala, Nestor Fernando; Giannini, Norberto Pedro; Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence; Society of Vertebrate Paleontology; Journal of Vertebrate Paleontology; 20; 3; 9-2000; 501-5060272-4634CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.tandfonline.com/doi/abs/10.1671/0272-4634(2000)020%5B0501%3AGCOTCA%5D2.0.CO%3B2info:eu-repo/semantics/altIdentifier/doi/10.1671/0272-4634(2000)020[0501:GCOTCA]2.0.CO;2info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:22:22Zoai:ri.conicet.gov.ar:11336/79120instacron: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 15:22:22.468CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence
title Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence
spellingShingle Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence
Abdala, Nestor Fernando
Ontogeny
Middle Triassic
Traversodontid Cynodont
title_short Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence
title_full Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence
title_fullStr Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence
title_full_unstemmed Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence
title_sort Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence
dc.creator.none.fl_str_mv Abdala, Nestor Fernando
Giannini, Norberto Pedro
author Abdala, Nestor Fernando
author_facet Abdala, Nestor Fernando
Giannini, Norberto Pedro
author_role author
author2 Giannini, Norberto Pedro
author2_role author
dc.subject.none.fl_str_mv Ontogeny
Middle Triassic
Traversodontid Cynodont
topic Ontogeny
Middle Triassic
Traversodontid Cynodont
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv A revision of gomphodont cynodonts from the Chan?ares Formation of Argentina, is presented. Four species in two genera: Massetognathus pascuali, M. teruggii, M. major, and Megagomphodon oligodens were originally described by Romer in 1967 and 1972. Qualitative characters proposed originally as diagnostic of the species were revised, and a bivariate analysis of allometry of 17 linear skull measurements was performed upon 31 specimens. Allometry relationships account for most of the differences among specimens. There are neither size gaps nor systematic trends across the sample. The temporal region scales with a positive allometry, whereas components of the neurocranium and muzzle show negative or isometric scaling. This results in a change from short, stocky skulls with large<br />muzzles in small specimens, to slender skulls with small muzzles and large temporal fossae characteristic of large individuals. The reduction and ontogenetic loss of the parietal foramen in a cynodont is reported for the first time. Consideration of qualitative characters together with the allometric results lead us to conclude that all forms belong to a single species in a growth series. Consequently, Massetognathus pascuali is recognized as the only valid entity, an idea previously suggested but without a justification based upon extensive analysis.
Fil: Abdala, Nestor Fernando. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Pontificia Universidade Católica do Rio Grande do Sul; Brasil. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo; Argentina
Fil: Giannini, Norberto Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán; Argentina. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Programa de Investigación de Biodiversidad Argentina; Argentina
description A revision of gomphodont cynodonts from the Chan?ares Formation of Argentina, is presented. Four species in two genera: Massetognathus pascuali, M. teruggii, M. major, and Megagomphodon oligodens were originally described by Romer in 1967 and 1972. Qualitative characters proposed originally as diagnostic of the species were revised, and a bivariate analysis of allometry of 17 linear skull measurements was performed upon 31 specimens. Allometry relationships account for most of the differences among specimens. There are neither size gaps nor systematic trends across the sample. The temporal region scales with a positive allometry, whereas components of the neurocranium and muzzle show negative or isometric scaling. This results in a change from short, stocky skulls with large<br />muzzles in small specimens, to slender skulls with small muzzles and large temporal fossae characteristic of large individuals. The reduction and ontogenetic loss of the parietal foramen in a cynodont is reported for the first time. Consideration of qualitative characters together with the allometric results lead us to conclude that all forms belong to a single species in a growth series. Consequently, Massetognathus pascuali is recognized as the only valid entity, an idea previously suggested but without a justification based upon extensive analysis.
publishDate 2000
dc.date.none.fl_str_mv 2000-09
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/79120
Abdala, Nestor Fernando; Giannini, Norberto Pedro; Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence; Society of Vertebrate Paleontology; Journal of Vertebrate Paleontology; 20; 3; 9-2000; 501-506
0272-4634
CONICET Digital
CONICET
url http://hdl.handle.net/11336/79120
identifier_str_mv Abdala, Nestor Fernando; Giannini, Norberto Pedro; Gomphodont cynodonts of the Chañares Formation: the analysis of an ontogenetic sequence; Society of Vertebrate Paleontology; Journal of Vertebrate Paleontology; 20; 3; 9-2000; 501-506
0272-4634
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.tandfonline.com/doi/abs/10.1671/0272-4634(2000)020%5B0501%3AGCOTCA%5D2.0.CO%3B2
info:eu-repo/semantics/altIdentifier/doi/10.1671/0272-4634(2000)020[0501:GCOTCA]2.0.CO;2
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Society of Vertebrate Paleontology
publisher.none.fl_str_mv Society of Vertebrate Paleontology
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
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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score 13.22299

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