New transitional fossil from late Jurassic of Chile sheds light on the origin of modern crocodiles

Abstract We describe the basal mesoeucrocodylian Burkesuchus mallingrandensis nov. gen. et sp., from the Upper Jurassic (Tithonian) Toqui Formation of southern Chile. The new taxon constitutes one of the few records of non-pelagic Jurassic crocodyliforms for the entire South American continent. Burk...

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Autores principales:	Fernando E. Novas, Federico L. Agnolin, Gabriel L. Lio, Sebastián Rozadilla, Manuel Suárez, Rita de la Cruz, Ismar de Souza Carvalho, David Rubilar-Rogers, Marcelo P. Isasi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b1e1ad050efe4983b8a97d1731523e38
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spelling	oai:doaj.org-article:b1e1ad050efe4983b8a97d1731523e382021-12-02T17:57:15ZNew transitional fossil from late Jurassic of Chile sheds light on the origin of modern crocodiles10.1038/s41598-021-93994-z2045-2322https://doaj.org/article/b1e1ad050efe4983b8a97d1731523e382021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-93994-zhttps://doaj.org/toc/2045-2322Abstract We describe the basal mesoeucrocodylian Burkesuchus mallingrandensis nov. gen. et sp., from the Upper Jurassic (Tithonian) Toqui Formation of southern Chile. The new taxon constitutes one of the few records of non-pelagic Jurassic crocodyliforms for the entire South American continent. Burkesuchus was found on the same levels that yielded titanosauriform and diplodocoid sauropods and the herbivore theropod Chilesaurus diegosuarezi, thus expanding the taxonomic composition of currently poorly known Jurassic reptilian faunas from Patagonia. Burkesuchus was a small-sized crocodyliform (estimated length 70 cm), with a cranium that is dorsoventrally depressed and transversely wide posteriorly and distinguished by a posteroventrally flexed wing-like squamosal. A well-defined longitudinal groove runs along the lateral edge of the postorbital and squamosal, indicative of a anteroposteriorly extensive upper earlid. Phylogenetic analysis supports Burkesuchus as a basal member of Mesoeucrocodylia. This new discovery expands the meagre record of non-pelagic representatives of this clade for the Jurassic Period, and together with Batrachomimus, from Upper Jurassic beds of Brazil, supports the idea that South America represented a cradle for the evolution of derived crocodyliforms during the Late Jurassic.Fernando E. NovasFederico L. AgnolinGabriel L. LioSebastián RozadillaManuel SuárezRita de la CruzIsmar de Souza CarvalhoDavid Rubilar-RogersMarcelo P. IsasiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Fernando E. Novas Federico L. Agnolin Gabriel L. Lio Sebastián Rozadilla Manuel Suárez Rita de la Cruz Ismar de Souza Carvalho David Rubilar-Rogers Marcelo P. Isasi New transitional fossil from late Jurassic of Chile sheds light on the origin of modern crocodiles
description	Abstract We describe the basal mesoeucrocodylian Burkesuchus mallingrandensis nov. gen. et sp., from the Upper Jurassic (Tithonian) Toqui Formation of southern Chile. The new taxon constitutes one of the few records of non-pelagic Jurassic crocodyliforms for the entire South American continent. Burkesuchus was found on the same levels that yielded titanosauriform and diplodocoid sauropods and the herbivore theropod Chilesaurus diegosuarezi, thus expanding the taxonomic composition of currently poorly known Jurassic reptilian faunas from Patagonia. Burkesuchus was a small-sized crocodyliform (estimated length 70 cm), with a cranium that is dorsoventrally depressed and transversely wide posteriorly and distinguished by a posteroventrally flexed wing-like squamosal. A well-defined longitudinal groove runs along the lateral edge of the postorbital and squamosal, indicative of a anteroposteriorly extensive upper earlid. Phylogenetic analysis supports Burkesuchus as a basal member of Mesoeucrocodylia. This new discovery expands the meagre record of non-pelagic representatives of this clade for the Jurassic Period, and together with Batrachomimus, from Upper Jurassic beds of Brazil, supports the idea that South America represented a cradle for the evolution of derived crocodyliforms during the Late Jurassic.
format	article
author	Fernando E. Novas Federico L. Agnolin Gabriel L. Lio Sebastián Rozadilla Manuel Suárez Rita de la Cruz Ismar de Souza Carvalho David Rubilar-Rogers Marcelo P. Isasi
author_facet	Fernando E. Novas Federico L. Agnolin Gabriel L. Lio Sebastián Rozadilla Manuel Suárez Rita de la Cruz Ismar de Souza Carvalho David Rubilar-Rogers Marcelo P. Isasi
author_sort	Fernando E. Novas
title	New transitional fossil from late Jurassic of Chile sheds light on the origin of modern crocodiles
title_short	New transitional fossil from late Jurassic of Chile sheds light on the origin of modern crocodiles
title_full	New transitional fossil from late Jurassic of Chile sheds light on the origin of modern crocodiles
title_fullStr	New transitional fossil from late Jurassic of Chile sheds light on the origin of modern crocodiles
title_full_unstemmed	New transitional fossil from late Jurassic of Chile sheds light on the origin of modern crocodiles
title_sort	new transitional fossil from late jurassic of chile sheds light on the origin of modern crocodiles
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b1e1ad050efe4983b8a97d1731523e38
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New transitional fossil from late Jurassic of Chile sheds light on the origin of modern crocodiles

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