The earliest bird-line archosaurs and the assembly of the dinosaur body plan

Autores
Nesbitt, Sterling J.; Butler, Richard J.; Ezcurra, Martin Daniel; Barrett, Paul M.; Stocker, Michelle R.; Angielczyk, Kenneth D.; Smith, Roger M. H.; Sidor, Christian A.; Niedźwiedzki, Grzegorz; Sennikov, Andrey G.; Charig, Alan J.
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The relationship between dinosaurs and other reptiles is well established, but the sequence of acquisition of dinosaurian features has been obscured by the scarcity of fossils with transitional morphologies. The closest extinct relatives of dinosaurs either have highly derived morphologies or are known from poorly preserved or incomplete material. Here we describe one of the stratigraphically lowest and phylogenetically earliest members of the avian stem lineage (Avemetatarsalia), Teleocrater rhadinus gen. et sp. nov., from the Middle Triassic epoch. The anatomy of T. rhadinus provides key information that unites several enigmatic taxa from across Pangaea into a previously unrecognized clade, Aphanosauria. This clade is the sister taxon of Ornithodira (pterosaurs and birds) and shortens the ghost lineage inferred at the base of Avemetatarsalia. We demonstrate that several anatomical features long thought to characterize Dinosauria and dinosauriforms evolved much earlier, soon after the bird-crocodylian split, and that the earliest avemetatarsalians retained the crocodylian-like ankle morphology and hindlimb proportions of stem archosaurs and early pseudosuchians. Early avemetatarsalians were substantially more species-rich, widely geographically distributed and morphologically diverse than previously recognized. Moreover, several early dinosauromorphs that were previously used as models to understand dinosaur origins may represent specialized forms rather than the ancestral avemetatarsalian morphology.
Fil: Nesbitt, Sterling J.. Virginia Tech University; Estados Unidos
Fil: Butler, Richard J.. University of Birmingham; Reino Unido
Fil: Ezcurra, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales ; Argentina. University of Birmingham; Reino Unido
Fil: Barrett, Paul M.. Natural History Museum; Reino Unido
Fil: Stocker, Michelle R.. Virginia Tech University; Estados Unidos
Fil: Angielczyk, Kenneth D.. The Field Museum; Estados Unidos
Fil: Smith, Roger M. H.. University of the Witwatersrand; Sudáfrica. Iziko South African Museum; Sudáfrica
Fil: Sidor, Christian A.. University of Washington; Estados Unidos
Fil: Niedźwiedzki, Grzegorz. Uppsala University; Suecia
Fil: Sennikov, Andrey G.. Russian Academy of Sciences; Rusia. Kazan Federal University; Rusia
Fil: Charig, Alan J.. Natural History Museum; Reino Unido
Materia
Palaeontology
Taxonomy
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:11336/49585
Acceder
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network_name_str CONICET Digital (CONICET)
spelling The earliest bird-line archosaurs and the assembly of the dinosaur body planNesbitt, Sterling J.Butler, Richard J.Ezcurra, Martin DanielBarrett, Paul M.Stocker, Michelle R.Angielczyk, Kenneth D.Smith, Roger M. H.Sidor, Christian A.Niedźwiedzki, GrzegorzSennikov, Andrey G.Charig, Alan J.PalaeontologyTaxonomyhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The relationship between dinosaurs and other reptiles is well established, but the sequence of acquisition of dinosaurian features has been obscured by the scarcity of fossils with transitional morphologies. The closest extinct relatives of dinosaurs either have highly derived morphologies or are known from poorly preserved or incomplete material. Here we describe one of the stratigraphically lowest and phylogenetically earliest members of the avian stem lineage (Avemetatarsalia), Teleocrater rhadinus gen. et sp. nov., from the Middle Triassic epoch. The anatomy of T. rhadinus provides key information that unites several enigmatic taxa from across Pangaea into a previously unrecognized clade, Aphanosauria. This clade is the sister taxon of Ornithodira (pterosaurs and birds) and shortens the ghost lineage inferred at the base of Avemetatarsalia. We demonstrate that several anatomical features long thought to characterize Dinosauria and dinosauriforms evolved much earlier, soon after the bird-crocodylian split, and that the earliest avemetatarsalians retained the crocodylian-like ankle morphology and hindlimb proportions of stem archosaurs and early pseudosuchians. Early avemetatarsalians were substantially more species-rich, widely geographically distributed and morphologically diverse than previously recognized. Moreover, several early dinosauromorphs that were previously used as models to understand dinosaur origins may represent specialized forms rather than the ancestral avemetatarsalian morphology.Fil: Nesbitt, Sterling J.. Virginia Tech University; Estados UnidosFil: Butler, Richard J.. University of Birmingham; Reino UnidoFil: Ezcurra, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales ; Argentina. University of Birmingham; Reino UnidoFil: Barrett, Paul M.. Natural History Museum; Reino UnidoFil: Stocker, Michelle R.. Virginia Tech University; Estados UnidosFil: Angielczyk, Kenneth D.. The Field Museum; Estados UnidosFil: Smith, Roger M. H.. University of the Witwatersrand; Sudáfrica. Iziko South African Museum; SudáfricaFil: Sidor, Christian A.. University of Washington; Estados UnidosFil: Niedźwiedzki, Grzegorz. Uppsala University; SueciaFil: Sennikov, Andrey G.. Russian Academy of Sciences; Rusia. Kazan Federal University; RusiaFil: Charig, Alan J.. Natural History Museum; Reino UnidoNature Publishing Group2017-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/49585Nesbitt, Sterling J.; Butler, Richard J.; Ezcurra, Martin Daniel; Barrett, Paul M.; Stocker, Michelle R.; et al.; The earliest bird-line archosaurs and the assembly of the dinosaur body plan; Nature Publishing Group; Nature; 544; 7651; 4-2017; 484-4870028-08361476-4687CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1038/nature22037info:eu-repo/semantics/altIdentifier/url/https://www.nature.com/articles/nature22037info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-17T10:56:43Zoai:ri.conicet.gov.ar:11336/49585instacron: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:34982025-09-17 10:56:43.742CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The earliest bird-line archosaurs and the assembly of the dinosaur body plan
title The earliest bird-line archosaurs and the assembly of the dinosaur body plan
spellingShingle The earliest bird-line archosaurs and the assembly of the dinosaur body plan
Nesbitt, Sterling J.
Palaeontology
Taxonomy
title_short The earliest bird-line archosaurs and the assembly of the dinosaur body plan
title_full The earliest bird-line archosaurs and the assembly of the dinosaur body plan
title_fullStr The earliest bird-line archosaurs and the assembly of the dinosaur body plan
title_full_unstemmed The earliest bird-line archosaurs and the assembly of the dinosaur body plan
title_sort The earliest bird-line archosaurs and the assembly of the dinosaur body plan
dc.creator.none.fl_str_mv Nesbitt, Sterling J.
Butler, Richard J.
Ezcurra, Martin Daniel
Barrett, Paul M.
Stocker, Michelle R.
Angielczyk, Kenneth D.
Smith, Roger M. H.
Sidor, Christian A.
Niedźwiedzki, Grzegorz
Sennikov, Andrey G.
Charig, Alan J.
author Nesbitt, Sterling J.
author_facet Nesbitt, Sterling J.
Butler, Richard J.
Ezcurra, Martin Daniel
Barrett, Paul M.
Stocker, Michelle R.
Angielczyk, Kenneth D.
Smith, Roger M. H.
Sidor, Christian A.
Niedźwiedzki, Grzegorz
Sennikov, Andrey G.
Charig, Alan J.
author_role author
author2 Butler, Richard J.
Ezcurra, Martin Daniel
Barrett, Paul M.
Stocker, Michelle R.
Angielczyk, Kenneth D.
Smith, Roger M. H.
Sidor, Christian A.
Niedźwiedzki, Grzegorz
Sennikov, Andrey G.
Charig, Alan J.
author2_role author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Palaeontology
Taxonomy
topic Palaeontology
Taxonomy
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 relationship between dinosaurs and other reptiles is well established, but the sequence of acquisition of dinosaurian features has been obscured by the scarcity of fossils with transitional morphologies. The closest extinct relatives of dinosaurs either have highly derived morphologies or are known from poorly preserved or incomplete material. Here we describe one of the stratigraphically lowest and phylogenetically earliest members of the avian stem lineage (Avemetatarsalia), Teleocrater rhadinus gen. et sp. nov., from the Middle Triassic epoch. The anatomy of T. rhadinus provides key information that unites several enigmatic taxa from across Pangaea into a previously unrecognized clade, Aphanosauria. This clade is the sister taxon of Ornithodira (pterosaurs and birds) and shortens the ghost lineage inferred at the base of Avemetatarsalia. We demonstrate that several anatomical features long thought to characterize Dinosauria and dinosauriforms evolved much earlier, soon after the bird-crocodylian split, and that the earliest avemetatarsalians retained the crocodylian-like ankle morphology and hindlimb proportions of stem archosaurs and early pseudosuchians. Early avemetatarsalians were substantially more species-rich, widely geographically distributed and morphologically diverse than previously recognized. Moreover, several early dinosauromorphs that were previously used as models to understand dinosaur origins may represent specialized forms rather than the ancestral avemetatarsalian morphology.
Fil: Nesbitt, Sterling J.. Virginia Tech University; Estados Unidos
Fil: Butler, Richard J.. University of Birmingham; Reino Unido
Fil: Ezcurra, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales ; Argentina. University of Birmingham; Reino Unido
Fil: Barrett, Paul M.. Natural History Museum; Reino Unido
Fil: Stocker, Michelle R.. Virginia Tech University; Estados Unidos
Fil: Angielczyk, Kenneth D.. The Field Museum; Estados Unidos
Fil: Smith, Roger M. H.. University of the Witwatersrand; Sudáfrica. Iziko South African Museum; Sudáfrica
Fil: Sidor, Christian A.. University of Washington; Estados Unidos
Fil: Niedźwiedzki, Grzegorz. Uppsala University; Suecia
Fil: Sennikov, Andrey G.. Russian Academy of Sciences; Rusia. Kazan Federal University; Rusia
Fil: Charig, Alan J.. Natural History Museum; Reino Unido
description The relationship between dinosaurs and other reptiles is well established, but the sequence of acquisition of dinosaurian features has been obscured by the scarcity of fossils with transitional morphologies. The closest extinct relatives of dinosaurs either have highly derived morphologies or are known from poorly preserved or incomplete material. Here we describe one of the stratigraphically lowest and phylogenetically earliest members of the avian stem lineage (Avemetatarsalia), Teleocrater rhadinus gen. et sp. nov., from the Middle Triassic epoch. The anatomy of T. rhadinus provides key information that unites several enigmatic taxa from across Pangaea into a previously unrecognized clade, Aphanosauria. This clade is the sister taxon of Ornithodira (pterosaurs and birds) and shortens the ghost lineage inferred at the base of Avemetatarsalia. We demonstrate that several anatomical features long thought to characterize Dinosauria and dinosauriforms evolved much earlier, soon after the bird-crocodylian split, and that the earliest avemetatarsalians retained the crocodylian-like ankle morphology and hindlimb proportions of stem archosaurs and early pseudosuchians. Early avemetatarsalians were substantially more species-rich, widely geographically distributed and morphologically diverse than previously recognized. Moreover, several early dinosauromorphs that were previously used as models to understand dinosaur origins may represent specialized forms rather than the ancestral avemetatarsalian morphology.
publishDate 2017
dc.date.none.fl_str_mv 2017-04
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/11336/49585
Nesbitt, Sterling J.; Butler, Richard J.; Ezcurra, Martin Daniel; Barrett, Paul M.; Stocker, Michelle R.; et al.; The earliest bird-line archosaurs and the assembly of the dinosaur body plan; Nature Publishing Group; Nature; 544; 7651; 4-2017; 484-487
0028-0836
1476-4687
CONICET Digital
CONICET
url http://hdl.handle.net/11336/49585
identifier_str_mv Nesbitt, Sterling J.; Butler, Richard J.; Ezcurra, Martin Daniel; Barrett, Paul M.; Stocker, Michelle R.; et al.; The earliest bird-line archosaurs and the assembly of the dinosaur body plan; Nature Publishing Group; Nature; 544; 7651; 4-2017; 484-487
0028-0836
1476-4687
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1038/nature22037
info:eu-repo/semantics/altIdentifier/url/https://www.nature.com/articles/nature22037
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 Nature Publishing Group
publisher.none.fl_str_mv Nature Publishing Group
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
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score 13.001348

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