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Re: Shenshou and Xianshou, new allotherian mammals from Jurassic of China

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On Wed, Sep 10, 2014 at 10:10 AM, Ben Creisler <bcreisler@gmail.com> wrote:
> Ben Creisler
> bcreisler@gmail.com
> New online paper in Nature (supplementary material is free):
> New taxa: Shenshou lui, Xianshou linglong and Xianshou songae
> Shundong Bi, Yuanqing Wang, Jian Guan, Xia Sheng & Jin Meng (2014)
> Three new Jurassic euharamiyidan species reinforce early divergence of 
> mammals.
> Nature (advance online publication)
> doi:10.1038/nature13718
> http://www.nature.com/nature/journal/vaop/ncurrent/full/nature13718.html
> The phylogeny of Allotheria, including Multituberculata and
> Haramiyida, remains unsolved and has generated contentious views on
> the origin and earliest evolution of mammals. Here we report three new
> species of a new clade, Euharamiyida, based on six well-preserved
> fossils from the Jurassic period of China. These fossils reveal many
> craniodental and postcranial features of euharamiyidans and clarify
> several ambiguous structures that are currently the topic of debate.
> Our phylogenetic analyses recognize Euharamiyida as the sister group
> of Multituberculata, and place Allotheria within the Mammalia. The
> phylogeny suggests that allotherian mammals evolved from a Late
> Triassic (approximately 208 million years ago) Haramiyavia-like
> ancestor and diversified into euharamiyidans and multituberculates
> with a cosmopolitan distribution, implying homologous acquisition of
> many craniodental and postcranial features in the two groups. Our
> findings also favour a Late Triassic origin of mammals in Laurasia and
> two independent detachment events of the middle ear bones during
> mammalian evolution.