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[dinosaur] Brasilestes, new tribosphenidan mammal from Late Cretaceous of Brazil (free pdf)




Ben Creisler
bcreisler@gmail.com



A new paper in open access:



Brasilestes stardusti gen. et sp. nov.



Mariela C. Castro, Francisco J. Goin, Edgardo Ortiz-Jaureguizar, E. Carolina Vieytes, Kaori Tsukui, Jahandar Ramezani, Alessandro Batezelli, JÃlio C. A. Marsola & Max C. Langer (2018)
A Late Cretaceous mammal from Brazil and the first radioisotopic age for the Bauru Group.
Royal Society Open Science 5: 180482
DOI: 10.1098/rsos.180482
http://rsos.royalsocietypublishing.org/content/5/5/180482
http://rsos.royalsocietypublishing.org/content/royopensci/5/5/180482.full.pdf



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 (â87.8âMa) for the type stratum, which is overlain by the dinosaur-bearing MarÃlia Formation, constraining the age of the Adamantina Formation at the site to late Coniacianâlate 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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"Species epithet after the fictional character Ziggy Stardust, honouring the deceased artist David Bowie."


News: (in Portuguese)

http://agencia.fapesp.br/mamifero_mais_antigo_do_brasil_viveu_no_tempo_dos_dinossauros/27916/

https://oglobo.globo.com/sociedade/ciencia/conheca-brasilestes-stardusti-mamifero-brasileiro-que-viveu-com-dinossauros-22731467


https://g1.globo.com/ciencia-e-saude/noticia/mamifero-mais-antigo-do-brasil-viveu-no-interior-de-sp-e-ganha-nome-em-homenagem-a-david-bowie.ghtml


https://www1.folha.uol.com.br/ciencia/2018/05/mamifero-brasileiro-da-era-dos-dinossauros-homenageia-david-bowie.shtml