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A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group

In the last three decades, records of tribosphenidan mammals from India, continental Africa, Madagascar and South America have challenged the notion of a strictly Laurasian distribution of the group during the Cretaceous. Here, we describe a lower premolar from the Late Cretaceous Adamantina Formati...

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Autores principales: Castro, Mariela C., Goin, Francisco J., Ortiz-Jaureguizar, Edgardo, Vieytes, E. Carolina, Tsukui, Kaori, Ramezani, Jahandar, Batezelli, Alessandro, Marsola, Júlio C. A., Langer, Max C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society Publishing 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5990825/
https://www.ncbi.nlm.nih.gov/pubmed/29892465
http://dx.doi.org/10.1098/rsos.180482
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author Castro, Mariela C.
Goin, Francisco J.
Ortiz-Jaureguizar, Edgardo
Vieytes, E. Carolina
Tsukui, Kaori
Ramezani, Jahandar
Batezelli, Alessandro
Marsola, Júlio C. A.
Langer, Max C.
author_facet Castro, Mariela C.
Goin, Francisco J.
Ortiz-Jaureguizar, Edgardo
Vieytes, E. Carolina
Tsukui, Kaori
Ramezani, Jahandar
Batezelli, Alessandro
Marsola, Júlio C. A.
Langer, Max C.
author_sort Castro, Mariela C.
collection PubMed
description In the last three decades, records of tribosphenidan mammals from India, continental Africa, Madagascar and South America have challenged the notion of a strictly Laurasian distribution of the group during the Cretaceous. Here, we describe a lower premolar from the Late Cretaceous Adamantina Formation, São Paulo State, Brazil. It differs from all known fossil mammals, except for a putative eutherian from the same geologic unity and Deccanolestes hislopi, from the Maastrichtian of India. The incompleteness of the material precludes narrowing down its taxonomic attribution further than Tribosphenida, but it is larger than most coeval mammals and shows a thin layer of parallel crystallite enamel. The new taxon helps filling two major gaps in the fossil record: the paucity of Mesozoic mammals in more northern parts of South America and of tribosphenidans in the Cretaceous of that continent. In addition, high-precision U-Pb geochronology provided a post-Turonian maximal age (≤87.8 Ma) for the type stratum, which is overlain by the dinosaur-bearing Marília Formation, constraining the age of the Adamantina Formation at the site to late Coniacian–late Maastrichtian. This represents the first radioisotopic age for the Bauru Group, a key stratigraphic unit for the study of Cretaceous tetrapods in Gondwana.
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spelling pubmed-59908252018-06-11 A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group Castro, Mariela C. Goin, Francisco J. Ortiz-Jaureguizar, Edgardo Vieytes, E. Carolina Tsukui, Kaori Ramezani, Jahandar Batezelli, Alessandro Marsola, Júlio C. A. Langer, Max C. R Soc Open Sci Biology (Whole Organism) In the last three decades, records of tribosphenidan mammals from India, continental Africa, Madagascar and South America have challenged the notion of a strictly Laurasian distribution of the group during the Cretaceous. Here, we describe a lower premolar from the Late Cretaceous Adamantina Formation, São Paulo State, Brazil. It differs from all known fossil mammals, except for a putative eutherian from the same geologic unity and Deccanolestes hislopi, from the Maastrichtian of India. The incompleteness of the material precludes narrowing down its taxonomic attribution further than Tribosphenida, but it is larger than most coeval mammals and shows a thin layer of parallel crystallite enamel. The new taxon helps filling two major gaps in the fossil record: the paucity of Mesozoic mammals in more northern parts of South America and of tribosphenidans in the Cretaceous of that continent. In addition, high-precision U-Pb geochronology provided a post-Turonian maximal age (≤87.8 Ma) for the type stratum, which is overlain by the dinosaur-bearing Marília Formation, constraining the age of the Adamantina Formation at the site to late Coniacian–late Maastrichtian. This represents the first radioisotopic age for the Bauru Group, a key stratigraphic unit for the study of Cretaceous tetrapods in Gondwana. The Royal Society Publishing 2018-05-30 /pmc/articles/PMC5990825/ /pubmed/29892465 http://dx.doi.org/10.1098/rsos.180482 Text en © 2018 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Biology (Whole Organism)
Castro, Mariela C.
Goin, Francisco J.
Ortiz-Jaureguizar, Edgardo
Vieytes, E. Carolina
Tsukui, Kaori
Ramezani, Jahandar
Batezelli, Alessandro
Marsola, Júlio C. A.
Langer, Max C.
A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group
title A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group
title_full A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group
title_fullStr A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group
title_full_unstemmed A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group
title_short A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group
title_sort late cretaceous mammal from brazil and the first radioisotopic age for the bauru group
topic Biology (Whole Organism)
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5990825/
https://www.ncbi.nlm.nih.gov/pubmed/29892465
http://dx.doi.org/10.1098/rsos.180482
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