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Artículo

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

Abdala, Nestor FernandoIcon ; Giannini, Norberto PedroIcon
Fecha de publicación: 09/2000
Editorial: Society of Vertebrate Paleontology
Revista: Journal of Vertebrate Paleontology
ISSN: 0272-4634
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Paleontología

Resumen

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.
Palabras clave: Ontogeny , Middle Triassic , Traversodontid Cynodont
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/79120
URL: https://www.tandfonline.com/doi/abs/10.1671/0272-4634(2000)020%5B0501%3AGCOTCA%5
DOI: https://doi.org/10.1671/0272-4634(2000)020[0501:GCOTCA]2.0.CO;2
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Articulos(CCT - NOA SUR)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - NOA SUR
Citación
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
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