The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica

Autores
Delcourt, Rafael; Grillo, Orlando Nelson; Hendrickx, Christophe Marie Fabian; Kellermann, Maximilian; Cardoso Langer, Max
Año de publicación
2025
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The upper carbonate concretion levels of the Romualdo Formation (Aptian, Brazil) have yielded several theropod dinosaur remains, including spinosaurids and the coelurosaurs Santanaraptor placidus and Mirischia asymmetrica, the phylogenetic affinities of which are controversial. Here, we present a comprehensive anatomical reassessment of the holotypes of both species (MN 4802-V and SMNK 2349 PAL, respectively), integrating newly observed osteological features and a detailed comparison of the pelvic and hind limb elements. Our preferred phylogenetic hypothesis places S. placidus and M. asymmetrica in the earliest-branching maniraptoromorph clade, along with Juratyrant langhami and Tanycolagreus topwilsoni from the Late Jurassic of Laurasia, suggesting an early diversification of coelurosaurs in that area, followed by Early Cretaceous dispersal events towards Gondwana. The comparative analysis of the two Romualdo taxa refutes their synonymy, given consistent differences in ischial (position and shape of the obturator plate and foramen) and tibial (condylar configuration) morphology. The observed morphological variation in the ischial obturator plate across early coelurosaurs further highlights a significant degree of homoplasy in this structure during the early radiation of the group. This revision underscores the need for additional research to further resolve the early evolutionary history of coelurosaur theropods.
Fil: Delcourt, Rafael. Universidade de Sao Paulo; Brasil
Fil: Grillo, Orlando Nelson. Universidade Federal Do Rio de Janeiro. Museu Nacional; Brasil
Fil: Hendrickx, Christophe Marie Fabian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina. Fundación Miguel Lillo; Argentina
Fil: Kellermann, Maximilian. Bayerische Staatssammlung für Paläontologie und Geologie. Staatliche Naturwissenschaftliche Sammlungen Bayerns; Alemania
Fil: Cardoso Langer, Max. Universidade de Sao Paulo; Brasil
Materia
Araripe
Coelurosauria
Dinosauria
Gondwana
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/277752
Acceder
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network_name_str CONICET Digital (CONICET)
spelling The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetricaDelcourt, RafaelGrillo, Orlando NelsonHendrickx, Christophe Marie FabianKellermann, MaximilianCardoso Langer, MaxAraripeCoelurosauriaDinosauriaGondwanahttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The upper carbonate concretion levels of the Romualdo Formation (Aptian, Brazil) have yielded several theropod dinosaur remains, including spinosaurids and the coelurosaurs Santanaraptor placidus and Mirischia asymmetrica, the phylogenetic affinities of which are controversial. Here, we present a comprehensive anatomical reassessment of the holotypes of both species (MN 4802-V and SMNK 2349 PAL, respectively), integrating newly observed osteological features and a detailed comparison of the pelvic and hind limb elements. Our preferred phylogenetic hypothesis places S. placidus and M. asymmetrica in the earliest-branching maniraptoromorph clade, along with Juratyrant langhami and Tanycolagreus topwilsoni from the Late Jurassic of Laurasia, suggesting an early diversification of coelurosaurs in that area, followed by Early Cretaceous dispersal events towards Gondwana. The comparative analysis of the two Romualdo taxa refutes their synonymy, given consistent differences in ischial (position and shape of the obturator plate and foramen) and tibial (condylar configuration) morphology. The observed morphological variation in the ischial obturator plate across early coelurosaurs further highlights a significant degree of homoplasy in this structure during the early radiation of the group. This revision underscores the need for additional research to further resolve the early evolutionary history of coelurosaur theropods.Fil: Delcourt, Rafael. Universidade de Sao Paulo; BrasilFil: Grillo, Orlando Nelson. Universidade Federal Do Rio de Janeiro. Museu Nacional; BrasilFil: Hendrickx, Christophe Marie Fabian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina. Fundación Miguel Lillo; ArgentinaFil: Kellermann, Maximilian. Bayerische Staatssammlung für Paläontologie und Geologie. Staatliche Naturwissenschaftliche Sammlungen Bayerns; AlemaniaFil: Cardoso Langer, Max. Universidade de Sao Paulo; BrasilWiley-liss, div John Wiley & Sons Inc.2025-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/277752Delcourt, Rafael; Grillo, Orlando Nelson; Hendrickx, Christophe Marie Fabian; Kellermann, Maximilian; Cardoso Langer, Max ; The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica; Wiley-liss, div John Wiley & Sons Inc.; Anatomical Record-Advances in Integrative Anatomy and Evolutionary Biology; 2025; 11-2025; 1-381932-8486CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://anatomypubs.onlinelibrary.wiley.com/doi/10.1002/ar.70085info:eu-repo/semantics/altIdentifier/doi/10.1002/ar.70085info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-12-23T14:33:56Zoai:ri.conicet.gov.ar:11336/277752instacron: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:34982025-12-23 14:33:56.898CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica
title The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica
spellingShingle The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica
Delcourt, Rafael
Araripe
Coelurosauria
Dinosauria
Gondwana
title_short The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica
title_full The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica
title_fullStr The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica
title_full_unstemmed The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica
title_sort The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica
dc.creator.none.fl_str_mv Delcourt, Rafael
Grillo, Orlando Nelson
Hendrickx, Christophe Marie Fabian
Kellermann, Maximilian
Cardoso Langer, Max
author Delcourt, Rafael
author_facet Delcourt, Rafael
Grillo, Orlando Nelson
Hendrickx, Christophe Marie Fabian
Kellermann, Maximilian
Cardoso Langer, Max
author_role author
author2 Grillo, Orlando Nelson
Hendrickx, Christophe Marie Fabian
Kellermann, Maximilian
Cardoso Langer, Max
author2_role author
author
author
author
dc.subject.none.fl_str_mv Araripe
Coelurosauria
Dinosauria
Gondwana
topic Araripe
Coelurosauria
Dinosauria
Gondwana
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 upper carbonate concretion levels of the Romualdo Formation (Aptian, Brazil) have yielded several theropod dinosaur remains, including spinosaurids and the coelurosaurs Santanaraptor placidus and Mirischia asymmetrica, the phylogenetic affinities of which are controversial. Here, we present a comprehensive anatomical reassessment of the holotypes of both species (MN 4802-V and SMNK 2349 PAL, respectively), integrating newly observed osteological features and a detailed comparison of the pelvic and hind limb elements. Our preferred phylogenetic hypothesis places S. placidus and M. asymmetrica in the earliest-branching maniraptoromorph clade, along with Juratyrant langhami and Tanycolagreus topwilsoni from the Late Jurassic of Laurasia, suggesting an early diversification of coelurosaurs in that area, followed by Early Cretaceous dispersal events towards Gondwana. The comparative analysis of the two Romualdo taxa refutes their synonymy, given consistent differences in ischial (position and shape of the obturator plate and foramen) and tibial (condylar configuration) morphology. The observed morphological variation in the ischial obturator plate across early coelurosaurs further highlights a significant degree of homoplasy in this structure during the early radiation of the group. This revision underscores the need for additional research to further resolve the early evolutionary history of coelurosaur theropods.
Fil: Delcourt, Rafael. Universidade de Sao Paulo; Brasil
Fil: Grillo, Orlando Nelson. Universidade Federal Do Rio de Janeiro. Museu Nacional; Brasil
Fil: Hendrickx, Christophe Marie Fabian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico - Tucumán. Unidad Ejecutora Lillo; Argentina. Fundación Miguel Lillo; Argentina
Fil: Kellermann, Maximilian. Bayerische Staatssammlung für Paläontologie und Geologie. Staatliche Naturwissenschaftliche Sammlungen Bayerns; Alemania
Fil: Cardoso Langer, Max. Universidade de Sao Paulo; Brasil
description The upper carbonate concretion levels of the Romualdo Formation (Aptian, Brazil) have yielded several theropod dinosaur remains, including spinosaurids and the coelurosaurs Santanaraptor placidus and Mirischia asymmetrica, the phylogenetic affinities of which are controversial. Here, we present a comprehensive anatomical reassessment of the holotypes of both species (MN 4802-V and SMNK 2349 PAL, respectively), integrating newly observed osteological features and a detailed comparison of the pelvic and hind limb elements. Our preferred phylogenetic hypothesis places S. placidus and M. asymmetrica in the earliest-branching maniraptoromorph clade, along with Juratyrant langhami and Tanycolagreus topwilsoni from the Late Jurassic of Laurasia, suggesting an early diversification of coelurosaurs in that area, followed by Early Cretaceous dispersal events towards Gondwana. The comparative analysis of the two Romualdo taxa refutes their synonymy, given consistent differences in ischial (position and shape of the obturator plate and foramen) and tibial (condylar configuration) morphology. The observed morphological variation in the ischial obturator plate across early coelurosaurs further highlights a significant degree of homoplasy in this structure during the early radiation of the group. This revision underscores the need for additional research to further resolve the early evolutionary history of coelurosaur theropods.
publishDate 2025
dc.date.none.fl_str_mv 2025-11
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/11336/277752
Delcourt, Rafael; Grillo, Orlando Nelson; Hendrickx, Christophe Marie Fabian; Kellermann, Maximilian; Cardoso Langer, Max ; The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica; Wiley-liss, div John Wiley & Sons Inc.; Anatomical Record-Advances in Integrative Anatomy and Evolutionary Biology; 2025; 11-2025; 1-38
1932-8486
CONICET Digital
CONICET
url http://hdl.handle.net/11336/277752
identifier_str_mv Delcourt, Rafael; Grillo, Orlando Nelson; Hendrickx, Christophe Marie Fabian; Kellermann, Maximilian; Cardoso Langer, Max ; The coelurosaur theropods of the Romualdo formation, early Cretaceous (Aptian) of Brazil: Santanaraptor placidus meets Mirischia asymmetrica; Wiley-liss, div John Wiley & Sons Inc.; Anatomical Record-Advances in Integrative Anatomy and Evolutionary Biology; 2025; 11-2025; 1-38
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/url/https://anatomypubs.onlinelibrary.wiley.com/doi/10.1002/ar.70085
info:eu-repo/semantics/altIdentifier/doi/10.1002/ar.70085
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley-liss, div John Wiley & Sons Inc.
publisher.none.fl_str_mv Wiley-liss, div John Wiley & Sons Inc.
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 12.441415

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