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[dinosaur] Durlstotherium and Durlstodon, new eutherian mammals from Cretaceous of Britain (free pdf)




Ben Creisler
bcreisler@gmail.com


A new paper in open access:

Durlstotherium gen. nov.Â
Durlstodon gen. nov



Steven C. Sweetman, Grant Smith, and David M. Martill (2017)
Highly derived eutherian mammals from the earliest Cretaceous of southern Britain.
Acta Palaeontologica Polonica (in press)
doi:https://doi.org/10.4202/app.00408.2017
http://app.pan.pl/article/item/app004082017.html

Free pdf:
http://app.pan.pl/archive/published/app62/app004082017.pdf



Eutherian mammals (Placentalia and all mammals phylogenetically closer to placentals than to marsupials) comprise the vast majority of extant Mammalia. Among these there is a phenomenal range of forms and sizes, but the origins of crown group placentals are obscure. They lie within the generally tiny mammals of the Mesozoic, represented for the most part by isolated teeth and jaws, and there is strongly conflicting evidence from phenomic and molecular data as to the date of origin of both Eutheria and Placentalia. The oldest purported eutherians are Juramaia from the Upper Jurassic of China, and Eomaia and Acristatherium from the Lower Cretaceous, also of China. Based on dental characters and analyses of other morphological and molecular data, doubt has recently been cast on the eutherian affinities of the Chinese taxa and consequently on the date of emergence of Eutheria. Until now, the only tribosphenic mammal recorded from the earliest Cretaceous (Berriasian) Purbeck Group of Britain was the stem tribosphenidan Tribactonodon. Here we document two new tribosphenic mammals from the Purbeck Group, Durlstotherium gen. nov. and Durlstodon gen. nov., showing highly derived eutherian molar characters that support the early emergence of this clade, prior to the Cretaceous.



News:

with video:

https://phys.org/news/2017-11-earliest-ancestors-southern-england.html

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also

https://www.eurekalert.org/pub_releases/2017-11/uop-mea110617.php

https://www.theguardian.com/science/2017/nov/07/teeth-discovered-in-dorset-reveal-secrets-of-the-origins-of-modern-mammals

http://www.bbc.com/news/science-environment-41889633

https://jerseyeveningpost.com/news/uk-news/2017/11/07/student-finds-145-million-year-old-rats-teeth-our-oldest-known-ancestors/
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