Project 1269: Shundong Bi, Yuanqing Wang, Jian Guan, Xia Sheng, Jin Meng. 2014. Three new Jurassic euharamiyidan species reinforce early divergence of mammals. Nature. (Nature 13718).
Specimen: † Shenshou shenshou lui (:LDNHMF2001)
View: body in situ

Abstract

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.


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Article DOI: 10.1038

Project DOI: 10.7934/P1269, http://dx.doi.org/10.7934/P1269
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MorphoBank Project 1269
  • Creation Date:
    23 September 2014
  • Publication Date:
    09 October 2014
  • Project views: 17618


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