The braincase of Chanaresuchus ischigualastensis (Archosauriformes) from the Late Triassic of Argentina

Here, we present information regarding the braincase anatomy of Chanaresuchus ischigualastensis, from the Ischigualasto Formation (Carnian) of Argentina. The braincase is very similar to that previously described for Chanaresuchus bonapartei, but bears some differences: rostral contour of the basal...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Trotteyn, M.J., Haro, J.A.
Formato: JOUR
Lenguaje:English
Materias:
anatomy
cranium
phylogenetics
reptile
Triassic
Argentina
Archosauriformes
Euparkeria
Proterochampsidae
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_02724634_v32_n4_p867_Trotteyn
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_02724634_v32_n4_p867_Trotteyn
record_format dspace
spelling todo:paper_02724634_v32_n4_p867_Trotteyn2023-10-03T15:15:09Z The braincase of Chanaresuchus ischigualastensis (Archosauriformes) from the Late Triassic of Argentina Trotteyn, M.J. Haro, J.A. anatomy cranium phylogenetics reptile Triassic Argentina Archosauriformes Euparkeria Proterochampsidae Here, we present information regarding the braincase anatomy of Chanaresuchus ischigualastensis, from the Ischigualasto Formation (Carnian) of Argentina. The braincase is very similar to that previously described for Chanaresuchus bonapartei, but bears some differences: rostral contour of the basal tubera nearly transversely oriented in ventral view; basal tubera with rounded distal tips in ventral view; paroccipital processes with a slight distal widening in caudal view; sulcus on the caudal surface of each paroccipital process restricted to the proximal two-thirds of the latter; and parabasisphenoidal ventral surface transversely concave. A phylogenetic analysis was performed using exclusively neurocranial characters, including a few new characters, to investigate phylogenetic hypotheses suggested by the neurocranial evidence. The neurocranial data support a sister-group relationship between Chanaresuchus ischigualastensis and C. bonapartei, on the basis of the presence of an intertuberal plate with a concave border. Our analysis also suggests the monophyly of a group formed by both species of Chanaresuchus and Proterochampsa. This group was supported by one apomorphy: the paroccipital processes are elongated relative to their height, which did not show homoplasy in our results. Our results show that Doswellia is the sister group of the clade formed by these proterochampsids, supporting inclusion of the former within the Proterochampsia, and this clade is recovered as more closely related to archosaurs than to Euparkeria. © 2012 by the Society of Vertebrate Paleontology. JOUR English info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_02724634_v32_n4_p867_Trotteyn
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language English
orig_language_str_mv English
topic anatomy
cranium
phylogenetics
reptile
Triassic
Argentina
Archosauriformes
Euparkeria
Proterochampsidae
spellingShingle anatomy
cranium
phylogenetics
reptile
Triassic
Argentina
Archosauriformes
Euparkeria
Proterochampsidae
Trotteyn, M.J.
Haro, J.A.
The braincase of Chanaresuchus ischigualastensis (Archosauriformes) from the Late Triassic of Argentina
topic_facet anatomy
cranium
phylogenetics
reptile
Triassic
Argentina
Archosauriformes
Euparkeria
Proterochampsidae
description Here, we present information regarding the braincase anatomy of Chanaresuchus ischigualastensis, from the Ischigualasto Formation (Carnian) of Argentina. The braincase is very similar to that previously described for Chanaresuchus bonapartei, but bears some differences: rostral contour of the basal tubera nearly transversely oriented in ventral view; basal tubera with rounded distal tips in ventral view; paroccipital processes with a slight distal widening in caudal view; sulcus on the caudal surface of each paroccipital process restricted to the proximal two-thirds of the latter; and parabasisphenoidal ventral surface transversely concave. A phylogenetic analysis was performed using exclusively neurocranial characters, including a few new characters, to investigate phylogenetic hypotheses suggested by the neurocranial evidence. The neurocranial data support a sister-group relationship between Chanaresuchus ischigualastensis and C. bonapartei, on the basis of the presence of an intertuberal plate with a concave border. Our analysis also suggests the monophyly of a group formed by both species of Chanaresuchus and Proterochampsa. This group was supported by one apomorphy: the paroccipital processes are elongated relative to their height, which did not show homoplasy in our results. Our results show that Doswellia is the sister group of the clade formed by these proterochampsids, supporting inclusion of the former within the Proterochampsia, and this clade is recovered as more closely related to archosaurs than to Euparkeria. © 2012 by the Society of Vertebrate Paleontology.
format JOUR
author Trotteyn, M.J.
Haro, J.A.
author_facet Trotteyn, M.J.
Haro, J.A.
author_sort Trotteyn, M.J.
title The braincase of Chanaresuchus ischigualastensis (Archosauriformes) from the Late Triassic of Argentina
title_short The braincase of Chanaresuchus ischigualastensis (Archosauriformes) from the Late Triassic of Argentina
title_full The braincase of Chanaresuchus ischigualastensis (Archosauriformes) from the Late Triassic of Argentina
title_fullStr The braincase of Chanaresuchus ischigualastensis (Archosauriformes) from the Late Triassic of Argentina
title_full_unstemmed The braincase of Chanaresuchus ischigualastensis (Archosauriformes) from the Late Triassic of Argentina
title_sort braincase of chanaresuchus ischigualastensis (archosauriformes) from the late triassic of argentina
url http://hdl.handle.net/20.500.12110/paper_02724634_v32_n4_p867_Trotteyn
work_keys_str_mv AT trotteynmj thebraincaseofchanaresuchusischigualastensisarchosauriformesfromthelatetriassicofargentina
AT haroja thebraincaseofchanaresuchusischigualastensisarchosauriformesfromthelatetriassicofargentina
AT trotteynmj braincaseofchanaresuchusischigualastensisarchosauriformesfromthelatetriassicofargentina
AT haroja braincaseofchanaresuchusischigualastensisarchosauriformesfromthelatetriassicofargentina
_version_ 1782028236551618560

Ejemplares similares