Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation

Autores
Porfiri, Juan D; Novas, Fernando Emilio; Calvo, Jorge; Agnolin, Federico L; Ezcurra, Martin Daniel; Cerda, Ignacio Alejandro
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión aceptada
Descripción
Megaraptorids are a group of predatory dinosaurs that inhabited Gondwana from Cenomanian to Santonian times (Late Cretaceous). Phylogenetic relationships of megaraptorids have been matter of recent debate, being alternatively interpreted as basal coelurosaurs, carcharodontosaurian allosauroids, megalosauroids, and basal tyrannosauroids. One of the main reasons for such different interpretations is the incomplete nature of most available megaraptorid skeletons and, in particular, the scarce information about their cranial anatomy. Here we describe a partially preserved skeleton of a juvenile specimen of Megaraptor namunhuaiquii that provides substantial new information about the cranial morphology of this Patagonian taxon. The specimen comes from the Upper Cretaceous (Turonian–Coniacian) of the Portezuelo Formation, northwestern Patagonia, Argentina. The anatomy of the new specimen bolsters the recently proposed hypothesis that megaraptorids are nested within Coelurosauria, and possibly within Tyrannosauroidea. The most relevant features that megaraptorans share with tyrannosauroids include several foramina on the premaxillary body, extremely long and straight prenarial process of the premaxilla, incisiviform premaxillary teeth with a D-shaped cross-section, and cranially expanded supratemporal fossae separated from each other by a sharp sagittal median crest on frontals, which was presumably extended caudally above the parietals (not preserved). Information gathered from the present specimen allows to make for the first time a reconstruction of the skull of Megaraptor and hypothesize about evolutionary trends within Tyrannosauroidea.
Fil: Porfiri, Juan D. Universidad Nacional del Comahue. Centro Paleontologico Lago Barreales; Argentina.
Fil: Novas, Fernando Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales; Argentina.
Fil: Calvo, Jorge. Universidad Nacional del Comahue. Centro Paleontologico Lago Barreales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Agnolin, Federico L.. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales; Argentina. Fundacion de Historia Natural Felix de Azara; Argentina.
Fil: Ezcurra, Martin Daniel. University of Birmingham. School of Geography, Earth and Environmental Sciences; Reino Unido.
Fil: Ezcurra, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Cerda, Ignacio Alejandro. Universidad Nacional de Rio Negro; Argentina.
Fil: Cerda, Ignacio Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fuente
Cretaceous Research Volume 51
Materia
Megaraptor
Coelurosauria
Tyrannosauroidea
Patagonia
Ciencias de la Tierra y Medio Ambiente
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
Repositorio Digital Institucional (UNCo)
Institución
Universidad Nacional del Comahue
OAI Identificador
oai:rdi.uncoma.edu.ar:uncomaid/18957
Acceder
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oai_identifier_str oai:rdi.uncoma.edu.ar:uncomaid/18957
network_acronym_str RDIUNCO
repository_id_str 7108
network_name_str Repositorio Digital Institucional (UNCo)
spelling Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiationPorfiri, Juan DNovas, Fernando EmilioCalvo, JorgeAgnolin, Federico LEzcurra, Martin DanielCerda, Ignacio AlejandroMegaraptorCoelurosauriaTyrannosauroideaPatagoniaCiencias de la Tierra y Medio AmbienteMegaraptorids are a group of predatory dinosaurs that inhabited Gondwana from Cenomanian to Santonian times (Late Cretaceous). Phylogenetic relationships of megaraptorids have been matter of recent debate, being alternatively interpreted as basal coelurosaurs, carcharodontosaurian allosauroids, megalosauroids, and basal tyrannosauroids. One of the main reasons for such different interpretations is the incomplete nature of most available megaraptorid skeletons and, in particular, the scarce information about their cranial anatomy. Here we describe a partially preserved skeleton of a juvenile specimen of Megaraptor namunhuaiquii that provides substantial new information about the cranial morphology of this Patagonian taxon. The specimen comes from the Upper Cretaceous (Turonian–Coniacian) of the Portezuelo Formation, northwestern Patagonia, Argentina. The anatomy of the new specimen bolsters the recently proposed hypothesis that megaraptorids are nested within Coelurosauria, and possibly within Tyrannosauroidea. The most relevant features that megaraptorans share with tyrannosauroids include several foramina on the premaxillary body, extremely long and straight prenarial process of the premaxilla, incisiviform premaxillary teeth with a D-shaped cross-section, and cranially expanded supratemporal fossae separated from each other by a sharp sagittal median crest on frontals, which was presumably extended caudally above the parietals (not preserved). Information gathered from the present specimen allows to make for the first time a reconstruction of the skull of Megaraptor and hypothesize about evolutionary trends within Tyrannosauroidea.Fil: Porfiri, Juan D. Universidad Nacional del Comahue. Centro Paleontologico Lago Barreales; Argentina.Fil: Novas, Fernando Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales; Argentina.Fil: Calvo, Jorge. Universidad Nacional del Comahue. Centro Paleontologico Lago Barreales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Agnolin, Federico L.. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales; Argentina. Fundacion de Historia Natural Felix de Azara; Argentina.Fil: Ezcurra, Martin Daniel. University of Birmingham. School of Geography, Earth and Environmental Sciences; Reino Unido.Fil: Ezcurra, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Cerda, Ignacio Alejandro. Universidad Nacional de Rio Negro; Argentina.Fil: Cerda, Ignacio Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Elsevier2014info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfpp. 35-55application/pdfhttps://rdi.uncoma.edu.ar/handle/uncomaid/18957Cretaceous Research Volume 51reponame:Repositorio Digital Institucional (UNCo)instname:Universidad Nacional del Comahueenghttps://doi.org/10.1016/j.cretres.2014.04.007info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/4.0/2026-11-05T12:29:22Zoai:rdi.uncoma.edu.ar:uncomaid/18957instacron:UNCoInstitucionalhttp://rdi.uncoma.edu.ar/Universidad públicaNo correspondehttp://rdi.uncoma.edu.ar/oaimirtha.mateo@biblioteca.uncoma.edu.ar; adriana.acuna@biblioteca.uncoma.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:71082026-11-05 12:29:23.043Repositorio Digital Institucional (UNCo) - Universidad Nacional del Comahuefalse
dc.title.none.fl_str_mv Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation
title Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation
spellingShingle Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation
Porfiri, Juan D
Megaraptor
Coelurosauria
Tyrannosauroidea
Patagonia
Ciencias de la Tierra y Medio Ambiente
title_short Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation
title_full Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation
title_fullStr Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation
title_full_unstemmed Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation
title_sort Juvenile specimen of Megaraptor (Dinosauria, Theropoda) sheds light about tyrannosauroid radiation
dc.creator.none.fl_str_mv Porfiri, Juan D
Novas, Fernando Emilio
Calvo, Jorge
Agnolin, Federico L
Ezcurra, Martin Daniel
Cerda, Ignacio Alejandro
author Porfiri, Juan D
author_facet Porfiri, Juan D
Novas, Fernando Emilio
Calvo, Jorge
Agnolin, Federico L
Ezcurra, Martin Daniel
Cerda, Ignacio Alejandro
author_role author
author2 Novas, Fernando Emilio
Calvo, Jorge
Agnolin, Federico L
Ezcurra, Martin Daniel
Cerda, Ignacio Alejandro
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Megaraptor
Coelurosauria
Tyrannosauroidea
Patagonia
Ciencias de la Tierra y Medio Ambiente
topic Megaraptor
Coelurosauria
Tyrannosauroidea
Patagonia
Ciencias de la Tierra y Medio Ambiente
dc.description.none.fl_txt_mv Megaraptorids are a group of predatory dinosaurs that inhabited Gondwana from Cenomanian to Santonian times (Late Cretaceous). Phylogenetic relationships of megaraptorids have been matter of recent debate, being alternatively interpreted as basal coelurosaurs, carcharodontosaurian allosauroids, megalosauroids, and basal tyrannosauroids. One of the main reasons for such different interpretations is the incomplete nature of most available megaraptorid skeletons and, in particular, the scarce information about their cranial anatomy. Here we describe a partially preserved skeleton of a juvenile specimen of Megaraptor namunhuaiquii that provides substantial new information about the cranial morphology of this Patagonian taxon. The specimen comes from the Upper Cretaceous (Turonian–Coniacian) of the Portezuelo Formation, northwestern Patagonia, Argentina. The anatomy of the new specimen bolsters the recently proposed hypothesis that megaraptorids are nested within Coelurosauria, and possibly within Tyrannosauroidea. The most relevant features that megaraptorans share with tyrannosauroids include several foramina on the premaxillary body, extremely long and straight prenarial process of the premaxilla, incisiviform premaxillary teeth with a D-shaped cross-section, and cranially expanded supratemporal fossae separated from each other by a sharp sagittal median crest on frontals, which was presumably extended caudally above the parietals (not preserved). Information gathered from the present specimen allows to make for the first time a reconstruction of the skull of Megaraptor and hypothesize about evolutionary trends within Tyrannosauroidea.
Fil: Porfiri, Juan D. Universidad Nacional del Comahue. Centro Paleontologico Lago Barreales; Argentina.
Fil: Novas, Fernando Emilio. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales; Argentina.
Fil: Calvo, Jorge. Universidad Nacional del Comahue. Centro Paleontologico Lago Barreales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Agnolin, Federico L.. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales; Argentina. Fundacion de Historia Natural Felix de Azara; Argentina.
Fil: Ezcurra, Martin Daniel. University of Birmingham. School of Geography, Earth and Environmental Sciences; Reino Unido.
Fil: Ezcurra, Martin Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Cerda, Ignacio Alejandro. Universidad Nacional de Rio Negro; Argentina.
Fil: Cerda, Ignacio Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
description Megaraptorids are a group of predatory dinosaurs that inhabited Gondwana from Cenomanian to Santonian times (Late Cretaceous). Phylogenetic relationships of megaraptorids have been matter of recent debate, being alternatively interpreted as basal coelurosaurs, carcharodontosaurian allosauroids, megalosauroids, and basal tyrannosauroids. One of the main reasons for such different interpretations is the incomplete nature of most available megaraptorid skeletons and, in particular, the scarce information about their cranial anatomy. Here we describe a partially preserved skeleton of a juvenile specimen of Megaraptor namunhuaiquii that provides substantial new information about the cranial morphology of this Patagonian taxon. The specimen comes from the Upper Cretaceous (Turonian–Coniacian) of the Portezuelo Formation, northwestern Patagonia, Argentina. The anatomy of the new specimen bolsters the recently proposed hypothesis that megaraptorids are nested within Coelurosauria, and possibly within Tyrannosauroidea. The most relevant features that megaraptorans share with tyrannosauroids include several foramina on the premaxillary body, extremely long and straight prenarial process of the premaxilla, incisiviform premaxillary teeth with a D-shaped cross-section, and cranially expanded supratemporal fossae separated from each other by a sharp sagittal median crest on frontals, which was presumably extended caudally above the parietals (not preserved). Information gathered from the present specimen allows to make for the first time a reconstruction of the skull of Megaraptor and hypothesize about evolutionary trends within Tyrannosauroidea.
publishDate 2014
dc.date.none.fl_str_mv 2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://rdi.uncoma.edu.ar/handle/uncomaid/18957
url https://rdi.uncoma.edu.ar/handle/uncomaid/18957
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.cretres.2014.04.007
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/4.0/
dc.format.none.fl_str_mv application/pdf
pp. 35-55
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv Cretaceous Research Volume 51
reponame:Repositorio Digital Institucional (UNCo)
instname:Universidad Nacional del Comahue
reponame_str Repositorio Digital Institucional (UNCo)
collection Repositorio Digital Institucional (UNCo)
instname_str Universidad Nacional del Comahue
repository.name.fl_str_mv Repositorio Digital Institucional (UNCo) - Universidad Nacional del Comahue
repository.mail.fl_str_mv mirtha.mateo@biblioteca.uncoma.edu.ar; adriana.acuna@biblioteca.uncoma.edu.ar
_version_ 1881033986209218560
score 13.334379

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