Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity

Autores
Lecuona, Agustina; Desojo, Julia Brenda; Pol, Diego
Año de publicación
2019
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
Romer, 1972, a basal suchian from the upper Carnian levels of the Chañares Formation (Upper Triassic, Ischigualasto-Villa Unión Basin), is nested within Gracilisuchidae along with Turfanosuchus dabanensis Young, 1973 and Yonghesuchus sangbiensis Wu, Liu and Li, 2001. A recent study described in detail its postcranial anatomy and phylogenetic relationships, but a thorough revision of its cranial anatomy is still missing. Several diagnostic cranial characters are present, and some differences among the hypodigm can be interpreted as ontogenetic variation. Gracilisuchus has large orbit openings (35–42 % of the skull table), comparable with Euparkeria capensis Ewer, 1965 (35 %), but larger than Turfanosuchus (30 %), Yonghesuchus (25 %) and paracrocodylomorphs. The supratemporal fenestra is quadrangular and wider than long, contrasting with most archosauriforms with longer than wide or subequal fenestrae. A small triangular postparietal is present in one specimen of Gracilisuchus (MCZVP 4117), as in basal archosauriforms (e.g., Euparkeria, Erythrosuchus africanus Broom, 1905). Some cranial characters, along with postcranial features, suggest a probably younger ontogenetic stage for the holotype specimen (PULR 08), including its skull length (73 mm) that represents 80–85 % of the skull length of the referred specimens, an interparietal suture visible along the entire interparietal contact (fused posteriorly in the referred specimens). However, the anteriorly open interparietal suture, the unpreserved occipital condyles, and the large orbits in every specimen, suggest that probably none of them reached somatic maturity. Skeletochronological studies of the available specimens would be important to test this hypothesis.
Fil: Lecuona, Agustina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; Argentina
Fil: Desojo, Julia Brenda. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina
Fil: Pol, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Museo Paleontológico Egidio Feruglio; Argentina
Reunión de Comunicaciones de la Asociación Paleontológica Argentina
La Plata
Argentina
Asociación Paleontológica Argentina
Materia
GRACILISUCHUS
SKULL
ONTOGENY
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:11336/202106
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/202106
network_acronym_str CONICETDig
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network_name_str CONICET Digital (CONICET)
spelling Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturityLecuona, AgustinaDesojo, Julia BrendaPol, DiegoGRACILISUCHUSSKULLONTOGENYhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Romer, 1972, a basal suchian from the upper Carnian levels of the Chañares Formation (Upper Triassic, Ischigualasto-Villa Unión Basin), is nested within Gracilisuchidae along with Turfanosuchus dabanensis Young, 1973 and Yonghesuchus sangbiensis Wu, Liu and Li, 2001. A recent study described in detail its postcranial anatomy and phylogenetic relationships, but a thorough revision of its cranial anatomy is still missing. Several diagnostic cranial characters are present, and some differences among the hypodigm can be interpreted as ontogenetic variation. Gracilisuchus has large orbit openings (35–42 % of the skull table), comparable with Euparkeria capensis Ewer, 1965 (35 %), but larger than Turfanosuchus (30 %), Yonghesuchus (25 %) and paracrocodylomorphs. The supratemporal fenestra is quadrangular and wider than long, contrasting with most archosauriforms with longer than wide or subequal fenestrae. A small triangular postparietal is present in one specimen of Gracilisuchus (MCZVP 4117), as in basal archosauriforms (e.g., Euparkeria, Erythrosuchus africanus Broom, 1905). Some cranial characters, along with postcranial features, suggest a probably younger ontogenetic stage for the holotype specimen (PULR 08), including its skull length (73 mm) that represents 80–85 % of the skull length of the referred specimens, an interparietal suture visible along the entire interparietal contact (fused posteriorly in the referred specimens). However, the anteriorly open interparietal suture, the unpreserved occipital condyles, and the large orbits in every specimen, suggest that probably none of them reached somatic maturity. Skeletochronological studies of the available specimens would be important to test this hypothesis.Fil: Lecuona, Agustina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; ArgentinaFil: Desojo, Julia Brenda. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; ArgentinaFil: Pol, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Museo Paleontológico Egidio Feruglio; ArgentinaReunión de Comunicaciones de la Asociación Paleontológica ArgentinaLa PlataArgentinaAsociación Paleontológica ArgentinaAsociación Paleontológica Argentina2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectReuniónBookhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/202106Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity; Reunión de Comunicaciones de la Asociación Paleontológica Argentina; La Plata; Argentina; 2019; 125-125CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.apaleontologica.org.ar/rcapa-reuniones-anteriores/Nacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:57:51Zoai:ri.conicet.gov.ar:11336/202106instacron: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:34982025-09-03 09:57:51.903CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity
title Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity
spellingShingle Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity
Lecuona, Agustina
GRACILISUCHUS
SKULL
ONTOGENY
title_short Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity
title_full Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity
title_fullStr Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity
title_full_unstemmed Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity
title_sort Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity
dc.creator.none.fl_str_mv Lecuona, Agustina
Desojo, Julia Brenda
Pol, Diego
author Lecuona, Agustina
author_facet Lecuona, Agustina
Desojo, Julia Brenda
Pol, Diego
author_role author
author2 Desojo, Julia Brenda
Pol, Diego
author2_role author
author
dc.subject.none.fl_str_mv GRACILISUCHUS
SKULL
ONTOGENY
topic GRACILISUCHUS
SKULL
ONTOGENY
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Romer, 1972, a basal suchian from the upper Carnian levels of the Chañares Formation (Upper Triassic, Ischigualasto-Villa Unión Basin), is nested within Gracilisuchidae along with Turfanosuchus dabanensis Young, 1973 and Yonghesuchus sangbiensis Wu, Liu and Li, 2001. A recent study described in detail its postcranial anatomy and phylogenetic relationships, but a thorough revision of its cranial anatomy is still missing. Several diagnostic cranial characters are present, and some differences among the hypodigm can be interpreted as ontogenetic variation. Gracilisuchus has large orbit openings (35–42 % of the skull table), comparable with Euparkeria capensis Ewer, 1965 (35 %), but larger than Turfanosuchus (30 %), Yonghesuchus (25 %) and paracrocodylomorphs. The supratemporal fenestra is quadrangular and wider than long, contrasting with most archosauriforms with longer than wide or subequal fenestrae. A small triangular postparietal is present in one specimen of Gracilisuchus (MCZVP 4117), as in basal archosauriforms (e.g., Euparkeria, Erythrosuchus africanus Broom, 1905). Some cranial characters, along with postcranial features, suggest a probably younger ontogenetic stage for the holotype specimen (PULR 08), including its skull length (73 mm) that represents 80–85 % of the skull length of the referred specimens, an interparietal suture visible along the entire interparietal contact (fused posteriorly in the referred specimens). However, the anteriorly open interparietal suture, the unpreserved occipital condyles, and the large orbits in every specimen, suggest that probably none of them reached somatic maturity. Skeletochronological studies of the available specimens would be important to test this hypothesis.
Fil: Lecuona, Agustina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigación en Paleobiología y Geología; Argentina
Fil: Desojo, Julia Brenda. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina
Fil: Pol, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Museo Paleontológico Egidio Feruglio; Argentina
Reunión de Comunicaciones de la Asociación Paleontológica Argentina
La Plata
Argentina
Asociación Paleontológica Argentina
description Romer, 1972, a basal suchian from the upper Carnian levels of the Chañares Formation (Upper Triassic, Ischigualasto-Villa Unión Basin), is nested within Gracilisuchidae along with Turfanosuchus dabanensis Young, 1973 and Yonghesuchus sangbiensis Wu, Liu and Li, 2001. A recent study described in detail its postcranial anatomy and phylogenetic relationships, but a thorough revision of its cranial anatomy is still missing. Several diagnostic cranial characters are present, and some differences among the hypodigm can be interpreted as ontogenetic variation. Gracilisuchus has large orbit openings (35–42 % of the skull table), comparable with Euparkeria capensis Ewer, 1965 (35 %), but larger than Turfanosuchus (30 %), Yonghesuchus (25 %) and paracrocodylomorphs. The supratemporal fenestra is quadrangular and wider than long, contrasting with most archosauriforms with longer than wide or subequal fenestrae. A small triangular postparietal is present in one specimen of Gracilisuchus (MCZVP 4117), as in basal archosauriforms (e.g., Euparkeria, Erythrosuchus africanus Broom, 1905). Some cranial characters, along with postcranial features, suggest a probably younger ontogenetic stage for the holotype specimen (PULR 08), including its skull length (73 mm) that represents 80–85 % of the skull length of the referred specimens, an interparietal suture visible along the entire interparietal contact (fused posteriorly in the referred specimens). However, the anteriorly open interparietal suture, the unpreserved occipital condyles, and the large orbits in every specimen, suggest that probably none of them reached somatic maturity. Skeletochronological studies of the available specimens would be important to test this hypothesis.
publishDate 2019
dc.date.none.fl_str_mv 2019
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Reunión
Book
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/202106
Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity; Reunión de Comunicaciones de la Asociación Paleontológica Argentina; La Plata; Argentina; 2019; 125-125
CONICET Digital
CONICET
url http://hdl.handle.net/11336/202106
identifier_str_mv Cranial anatomy of Gracilisuchus stipanicicorum and its evidence for maturity; Reunión de Comunicaciones de la Asociación Paleontológica Argentina; La Plata; Argentina; 2019; 125-125
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.apaleontologica.org.ar/rcapa-reuniones-anteriores/
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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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
dc.coverage.none.fl_str_mv Nacional
dc.publisher.none.fl_str_mv Asociación Paleontológica Argentina
publisher.none.fl_str_mv Asociación Paleontológica Argentina
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
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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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