New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina

Autores
Ezcurra, Martin Daniel; Nesbitt, Sterling J.; Fiorelli, Lucas Ernesto; Desojo, Julia Brenda
Año de publicación
2020
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The lower Carnian levels of the Chañares Formation (IschigualastoVilla Unión Basin, La Rioja Province) have yielded some of the most informative dinosaur precursor species known so far. However, these species are based on partial skeletons that in several cases hamper the comparison between them because of the absence of overlapping bones. This has generated a contentious debate during the last 20 years about the synonymy between two of these species, Lewisuchus admixtus and Pseudolagosuchus major. Here, we describe a new dinosauriform partial skeleton (CRILARPv 552) recently collected in the Chañares Formation that preserves previously unknown anatomical regions for the dinosaur precursors of this unit (e.g., premaxilla, inner ear, anterior zeugopodium) and allows comparisons with other dinosauriform specimens. CRILAR-Pv 552 is referred to Lewisuchus admixtus because it possesses a proportionally large skull, a laterally projected, shelf-like ridge on the jugal, and recurved, finely serrated middle–posterior maxillary and dentary teeth ankylosed to the bone, and the absence of a coracoid foramen. The new specimen preserves a dorsally bowed dentary with a lateroventral shelf that is identical to a dentary associated with the holotype of Lewisuchus admixtus. Additionally, the morphology of the new specimen is completely congruent with that of specimens of Pseudolagosuchus major, bolstering the hypothesis that the latter species is a subjective junior synonym of Lewisuchus admixtus. A preliminary phylogenetic analysis with updated scorings for Lewisuchus admixtus found this species at the base of Silesauridae. Anat Rec, 00:000–000, 2019.
Fil: Ezcurra, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Nesbitt, Sterling J.. Virginia Polytechnic Institute; Estados Unidos
Fil: Fiorelli, Lucas Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; Argentina
Fil: Desojo, Julia Brenda. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Materia
ARCHOSAURIA
DINOSAURIFORMES
ISCHIGUALASTO-VILLA UNIÓN BASIN
LATE TRIASSIC
LEWISUCHUS ADMIXTUS
PSEUDOLAGOSUCHUS MAJOR
SOUTH AMERICA
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:11336/129047

id CONICETDig_d4bf975c4b7f1b7281b28465b159c575
oai_identifier_str oai:ri.conicet.gov.ar:11336/129047
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW ArgentinaEzcurra, Martin DanielNesbitt, Sterling J.Fiorelli, Lucas ErnestoDesojo, Julia BrendaARCHOSAURIADINOSAURIFORMESISCHIGUALASTO-VILLA UNIÓN BASINLATE TRIASSICLEWISUCHUS ADMIXTUSPSEUDOLAGOSUCHUS MAJORSOUTH AMERICAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The lower Carnian levels of the Chañares Formation (IschigualastoVilla Unión Basin, La Rioja Province) have yielded some of the most informative dinosaur precursor species known so far. However, these species are based on partial skeletons that in several cases hamper the comparison between them because of the absence of overlapping bones. This has generated a contentious debate during the last 20 years about the synonymy between two of these species, Lewisuchus admixtus and Pseudolagosuchus major. Here, we describe a new dinosauriform partial skeleton (CRILARPv 552) recently collected in the Chañares Formation that preserves previously unknown anatomical regions for the dinosaur precursors of this unit (e.g., premaxilla, inner ear, anterior zeugopodium) and allows comparisons with other dinosauriform specimens. CRILAR-Pv 552 is referred to Lewisuchus admixtus because it possesses a proportionally large skull, a laterally projected, shelf-like ridge on the jugal, and recurved, finely serrated middle–posterior maxillary and dentary teeth ankylosed to the bone, and the absence of a coracoid foramen. The new specimen preserves a dorsally bowed dentary with a lateroventral shelf that is identical to a dentary associated with the holotype of Lewisuchus admixtus. Additionally, the morphology of the new specimen is completely congruent with that of specimens of Pseudolagosuchus major, bolstering the hypothesis that the latter species is a subjective junior synonym of Lewisuchus admixtus. A preliminary phylogenetic analysis with updated scorings for Lewisuchus admixtus found this species at the base of Silesauridae. Anat Rec, 00:000–000, 2019.Fil: Ezcurra, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaFil: Nesbitt, Sterling J.. Virginia Polytechnic Institute; Estados UnidosFil: Fiorelli, Lucas Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; ArgentinaFil: Desojo, Julia Brenda. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaVeterinary and Human Toxicology2020-05info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/129047Ezcurra, Martin Daniel; Nesbitt, Sterling J.; Fiorelli, Lucas Ernesto; Desojo, Julia Brenda; New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina; Veterinary and Human Toxicology; Anatomical Record-Advances in Integrative Anatomy and Evolutionary Biology; 303; 5; 5-2020; 1393-14381932-8486CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1002/ar.24243info:eu-repo/semantics/altIdentifier/url/https://anatomypubs.onlinelibrary.wiley.com/doi/abs/10.1002/ar.24243info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:31:07Zoai:ri.conicet.gov.ar:11336/129047instacron: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:34982025-10-15 15:31:08.115CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina
title New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina
spellingShingle New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina
Ezcurra, Martin Daniel
ARCHOSAURIA
DINOSAURIFORMES
ISCHIGUALASTO-VILLA UNIÓN BASIN
LATE TRIASSIC
LEWISUCHUS ADMIXTUS
PSEUDOLAGOSUCHUS MAJOR
SOUTH AMERICA
title_short New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina
title_full New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina
title_fullStr New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina
title_full_unstemmed New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina
title_sort New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina
dc.creator.none.fl_str_mv Ezcurra, Martin Daniel
Nesbitt, Sterling J.
Fiorelli, Lucas Ernesto
Desojo, Julia Brenda
author Ezcurra, Martin Daniel
author_facet Ezcurra, Martin Daniel
Nesbitt, Sterling J.
Fiorelli, Lucas Ernesto
Desojo, Julia Brenda
author_role author
author2 Nesbitt, Sterling J.
Fiorelli, Lucas Ernesto
Desojo, Julia Brenda
author2_role author
author
author
dc.subject.none.fl_str_mv ARCHOSAURIA
DINOSAURIFORMES
ISCHIGUALASTO-VILLA UNIÓN BASIN
LATE TRIASSIC
LEWISUCHUS ADMIXTUS
PSEUDOLAGOSUCHUS MAJOR
SOUTH AMERICA
topic ARCHOSAURIA
DINOSAURIFORMES
ISCHIGUALASTO-VILLA UNIÓN BASIN
LATE TRIASSIC
LEWISUCHUS ADMIXTUS
PSEUDOLAGOSUCHUS MAJOR
SOUTH AMERICA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The lower Carnian levels of the Chañares Formation (IschigualastoVilla Unión Basin, La Rioja Province) have yielded some of the most informative dinosaur precursor species known so far. However, these species are based on partial skeletons that in several cases hamper the comparison between them because of the absence of overlapping bones. This has generated a contentious debate during the last 20 years about the synonymy between two of these species, Lewisuchus admixtus and Pseudolagosuchus major. Here, we describe a new dinosauriform partial skeleton (CRILARPv 552) recently collected in the Chañares Formation that preserves previously unknown anatomical regions for the dinosaur precursors of this unit (e.g., premaxilla, inner ear, anterior zeugopodium) and allows comparisons with other dinosauriform specimens. CRILAR-Pv 552 is referred to Lewisuchus admixtus because it possesses a proportionally large skull, a laterally projected, shelf-like ridge on the jugal, and recurved, finely serrated middle–posterior maxillary and dentary teeth ankylosed to the bone, and the absence of a coracoid foramen. The new specimen preserves a dorsally bowed dentary with a lateroventral shelf that is identical to a dentary associated with the holotype of Lewisuchus admixtus. Additionally, the morphology of the new specimen is completely congruent with that of specimens of Pseudolagosuchus major, bolstering the hypothesis that the latter species is a subjective junior synonym of Lewisuchus admixtus. A preliminary phylogenetic analysis with updated scorings for Lewisuchus admixtus found this species at the base of Silesauridae. Anat Rec, 00:000–000, 2019.
Fil: Ezcurra, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Fil: Nesbitt, Sterling J.. Virginia Polytechnic Institute; Estados Unidos
Fil: Fiorelli, Lucas Ernesto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Universidad Nacional de Catamarca. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Secretaría de Industria y Minería. Servicio Geológico Minero Argentino. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja. - Provincia de La Rioja. Centro Regional de Investigaciones Científicas y Transferencia Tecnológica de La Rioja; Argentina
Fil: Desojo, Julia Brenda. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
description The lower Carnian levels of the Chañares Formation (IschigualastoVilla Unión Basin, La Rioja Province) have yielded some of the most informative dinosaur precursor species known so far. However, these species are based on partial skeletons that in several cases hamper the comparison between them because of the absence of overlapping bones. This has generated a contentious debate during the last 20 years about the synonymy between two of these species, Lewisuchus admixtus and Pseudolagosuchus major. Here, we describe a new dinosauriform partial skeleton (CRILARPv 552) recently collected in the Chañares Formation that preserves previously unknown anatomical regions for the dinosaur precursors of this unit (e.g., premaxilla, inner ear, anterior zeugopodium) and allows comparisons with other dinosauriform specimens. CRILAR-Pv 552 is referred to Lewisuchus admixtus because it possesses a proportionally large skull, a laterally projected, shelf-like ridge on the jugal, and recurved, finely serrated middle–posterior maxillary and dentary teeth ankylosed to the bone, and the absence of a coracoid foramen. The new specimen preserves a dorsally bowed dentary with a lateroventral shelf that is identical to a dentary associated with the holotype of Lewisuchus admixtus. Additionally, the morphology of the new specimen is completely congruent with that of specimens of Pseudolagosuchus major, bolstering the hypothesis that the latter species is a subjective junior synonym of Lewisuchus admixtus. A preliminary phylogenetic analysis with updated scorings for Lewisuchus admixtus found this species at the base of Silesauridae. Anat Rec, 00:000–000, 2019.
publishDate 2020
dc.date.none.fl_str_mv 2020-05
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/11336/129047
Ezcurra, Martin Daniel; Nesbitt, Sterling J.; Fiorelli, Lucas Ernesto; Desojo, Julia Brenda; New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina; Veterinary and Human Toxicology; Anatomical Record-Advances in Integrative Anatomy and Evolutionary Biology; 303; 5; 5-2020; 1393-1438
1932-8486
CONICET Digital
CONICET
url http://hdl.handle.net/11336/129047
identifier_str_mv Ezcurra, Martin Daniel; Nesbitt, Sterling J.; Fiorelli, Lucas Ernesto; Desojo, Julia Brenda; New specimen sheds light on the anatomy and taxonomy of the Early Late Triassic Dinosauriforms from the Chañares Formation, NW Argentina; Veterinary and Human Toxicology; Anatomical Record-Advances in Integrative Anatomy and Evolutionary Biology; 303; 5; 5-2020; 1393-1438
1932-8486
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1002/ar.24243
info:eu-repo/semantics/altIdentifier/url/https://anatomypubs.onlinelibrary.wiley.com/doi/abs/10.1002/ar.24243
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
dc.publisher.none.fl_str_mv Veterinary and Human Toxicology
publisher.none.fl_str_mv Veterinary and Human Toxicology
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
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
_version_ 1846083447829823488
score 13.22299