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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/79120
Ver los metadatos del registro completo
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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 Técnicas2025-09-29T10:25:09Zoai: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:34982025-09-29 10:25:10.241CONICET 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 |
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CONICET Digital (CONICET) |
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CONICET Digital (CONICET) |
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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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1844614249897263104 |
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13.070432 |