New information on the braincase and mandible of Coahomasuchus (Archosauria: Aetosauria) from the Otischalkian (Carnian) of Texas

The aetosaur genus Coahomasuchus HECKERT and LUCAS, 1999 is known from a single specimen from the Colorado City Formation (Upper Triassic, Late Carnian) of the Chinle Group. New data on the braincase and mandible, as well as a revised diagnosis, are presented. The preserved braincase region includes...

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Autores principales: Desojo, J.B., Heckert, A.B.
Formato: JOUR
Materias:
Archosauria
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00283630_v_n10_p605_Desojo
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00283630_v_n10_p605_Desojo2023-10-03T14:38:45Z New information on the braincase and mandible of Coahomasuchus (Archosauria: Aetosauria) from the Otischalkian (Carnian) of Texas Desojo, J.B. Heckert, A.B. Archosauria The aetosaur genus Coahomasuchus HECKERT and LUCAS, 1999 is known from a single specimen from the Colorado City Formation (Upper Triassic, Late Carnian) of the Chinle Group. New data on the braincase and mandible, as well as a revised diagnosis, are presented. The preserved braincase region includes all or parts of the parasphenoid, basisphenoid, basioccipital, and opisthotic, all of which are described here. The preserved mandible includes a small fragment of the dentary, splenial, angular, surangular, articular, and prearticular. This new cranial description is intended to provide more information on this taxon for future studies on the interrelationships of the Aetosauria. We document that some characters used to discriminate some aetosaurian taxa, such as the presence or absence of a ventral depression on the basisphenoid and a laterally exposed splenial, should not be used in future phylogenetic analyses of aetosaurs. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00283630_v_n10_p605_Desojo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Archosauria
spellingShingle Archosauria
Desojo, J.B.
Heckert, A.B.
New information on the braincase and mandible of Coahomasuchus (Archosauria: Aetosauria) from the Otischalkian (Carnian) of Texas
topic_facet Archosauria
description The aetosaur genus Coahomasuchus HECKERT and LUCAS, 1999 is known from a single specimen from the Colorado City Formation (Upper Triassic, Late Carnian) of the Chinle Group. New data on the braincase and mandible, as well as a revised diagnosis, are presented. The preserved braincase region includes all or parts of the parasphenoid, basisphenoid, basioccipital, and opisthotic, all of which are described here. The preserved mandible includes a small fragment of the dentary, splenial, angular, surangular, articular, and prearticular. This new cranial description is intended to provide more information on this taxon for future studies on the interrelationships of the Aetosauria. We document that some characters used to discriminate some aetosaurian taxa, such as the presence or absence of a ventral depression on the basisphenoid and a laterally exposed splenial, should not be used in future phylogenetic analyses of aetosaurs.
format JOUR
author Desojo, J.B.
Heckert, A.B.
author_facet Desojo, J.B.
Heckert, A.B.
author_sort Desojo, J.B.
title New information on the braincase and mandible of Coahomasuchus (Archosauria: Aetosauria) from the Otischalkian (Carnian) of Texas
title_short New information on the braincase and mandible of Coahomasuchus (Archosauria: Aetosauria) from the Otischalkian (Carnian) of Texas
title_full New information on the braincase and mandible of Coahomasuchus (Archosauria: Aetosauria) from the Otischalkian (Carnian) of Texas
title_fullStr New information on the braincase and mandible of Coahomasuchus (Archosauria: Aetosauria) from the Otischalkian (Carnian) of Texas
title_full_unstemmed New information on the braincase and mandible of Coahomasuchus (Archosauria: Aetosauria) from the Otischalkian (Carnian) of Texas
title_sort new information on the braincase and mandible of coahomasuchus (archosauria: aetosauria) from the otischalkian (carnian) of texas
url http://hdl.handle.net/20.500.12110/paper_00283630_v_n10_p605_Desojo
work_keys_str_mv AT desojojb newinformationonthebraincaseandmandibleofcoahomasuchusarchosauriaaetosauriafromtheotischalkiancarnianoftexas
AT heckertab newinformationonthebraincaseandmandibleofcoahomasuchusarchosauriaaetosauriafromtheotischalkiancarnianoftexas
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