Noasaurids are a component of the Australian ‘mid’-Cretaceous theropod fauna

Abstract The diversity of Australia’s theropod fauna from the ‘mid’-Cretaceous (Albian–Cenomanian) is distinctly biased towards the medium-sized megaraptorids, despite the preponderance of abelisauroids in the younger but latitudinally equivalent Patagonian theropod fauna. Here, we present new evide...

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Autores principales:	Tom Brougham, Elizabeth T. Smith, Phil R. Bell
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3d45d5e3a7114a3dbec4fb8b51ebcb9a
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spelling	oai:doaj.org-article:3d45d5e3a7114a3dbec4fb8b51ebcb9a2021-12-02T14:16:58ZNoasaurids are a component of the Australian ‘mid’-Cretaceous theropod fauna10.1038/s41598-020-57667-72045-2322https://doaj.org/article/3d45d5e3a7114a3dbec4fb8b51ebcb9a2020-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-57667-7https://doaj.org/toc/2045-2322Abstract The diversity of Australia’s theropod fauna from the ‘mid’-Cretaceous (Albian–Cenomanian) is distinctly biased towards the medium-sized megaraptorids, despite the preponderance of abelisauroids in the younger but latitudinally equivalent Patagonian theropod fauna. Here, we present new evidence for the presence of ceratosaurian, and specifically abelisauroid, theropods from the Cenomanian Griman Creek Formation of Lightning Ridge, New South Wales. A partial cervical vertebra is described that bears a mediolaterally concave ventral surface of the centrum delimited by sharp ventrolateral ridges that contact the parapophyses. Among theropods, this feature has been reported only in a cervical vertebra attributed to the noasaurid Noasaurus. We also reappraise evidence recently cited against the ceratosaurian interpretation of a recently described astragalocalcaneum from the upper Barremian–lower Aptian San Remo Member of the upper Strzelecki Group in Victoria. Inclusion of the Lightning Ridge cervical vertebra and Victorian astragalocalcaneum into a revised phylogenetic analysis focused on elucidating ceratosaurian affinities reveals support for placement of both specimens within Noasauridae, which among other characters is diagnosed by the presence of a medial eminence on the ascending process of the astragalus. The Lightning Ridge and Victorian specimens simultaneously represent the first noasaurids reported from Australia and the astragalocalcaneum is considered the earliest known example of a noasaurid in the world to date. The recognition of Australian noasaurids further indicates a more widespread Gondwanan distribution of the clade outside of South America, Madagascar and India consistent with the timing of the fragmentation of the supercontinent.Tom BroughamElizabeth T. SmithPhil R. BellNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-10 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tom Brougham Elizabeth T. Smith Phil R. Bell Noasaurids are a component of the Australian ‘mid’-Cretaceous theropod fauna
description	Abstract The diversity of Australia’s theropod fauna from the ‘mid’-Cretaceous (Albian–Cenomanian) is distinctly biased towards the medium-sized megaraptorids, despite the preponderance of abelisauroids in the younger but latitudinally equivalent Patagonian theropod fauna. Here, we present new evidence for the presence of ceratosaurian, and specifically abelisauroid, theropods from the Cenomanian Griman Creek Formation of Lightning Ridge, New South Wales. A partial cervical vertebra is described that bears a mediolaterally concave ventral surface of the centrum delimited by sharp ventrolateral ridges that contact the parapophyses. Among theropods, this feature has been reported only in a cervical vertebra attributed to the noasaurid Noasaurus. We also reappraise evidence recently cited against the ceratosaurian interpretation of a recently described astragalocalcaneum from the upper Barremian–lower Aptian San Remo Member of the upper Strzelecki Group in Victoria. Inclusion of the Lightning Ridge cervical vertebra and Victorian astragalocalcaneum into a revised phylogenetic analysis focused on elucidating ceratosaurian affinities reveals support for placement of both specimens within Noasauridae, which among other characters is diagnosed by the presence of a medial eminence on the ascending process of the astragalus. The Lightning Ridge and Victorian specimens simultaneously represent the first noasaurids reported from Australia and the astragalocalcaneum is considered the earliest known example of a noasaurid in the world to date. The recognition of Australian noasaurids further indicates a more widespread Gondwanan distribution of the clade outside of South America, Madagascar and India consistent with the timing of the fragmentation of the supercontinent.
format	article
author	Tom Brougham Elizabeth T. Smith Phil R. Bell
author_facet	Tom Brougham Elizabeth T. Smith Phil R. Bell
author_sort	Tom Brougham
title	Noasaurids are a component of the Australian ‘mid’-Cretaceous theropod fauna
title_short	Noasaurids are a component of the Australian ‘mid’-Cretaceous theropod fauna
title_full	Noasaurids are a component of the Australian ‘mid’-Cretaceous theropod fauna
title_fullStr	Noasaurids are a component of the Australian ‘mid’-Cretaceous theropod fauna
title_full_unstemmed	Noasaurids are a component of the Australian ‘mid’-Cretaceous theropod fauna
title_sort	noasaurids are a component of the australian ‘mid’-cretaceous theropod fauna
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/3d45d5e3a7114a3dbec4fb8b51ebcb9a
work_keys_str_mv	AT tombrougham noasauridsareacomponentoftheaustralianmidcretaceoustheropodfauna AT elizabethtsmith noasauridsareacomponentoftheaustralianmidcretaceoustheropodfauna AT philrbell noasauridsareacomponentoftheaustralianmidcretaceoustheropodfauna
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Noasaurids are a component of the Australian ‘mid’-Cretaceous theropod fauna

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