摘要
The well-accepted Euarchonta grandorder is a pruned version of Archonta nested within the Euarchontoglires(or Supraprimates)clade.At present,it includes tree shrews(Scandentia),flying lemurs(Dermoptera)and primates(Primates).Here,a phylogenomic dataset containing 1912 exons from 22 representative mammals was compiled to investigate the phylogenetic relationships within this group.Phylogenetic analyses and hypothesis testing suggested that tree shrews can be classified as a sister group to Primates or to Glires or even as a basal clade within Euarchontoglires.Further analyses of both modified and original previously published datasets found that the phylogenetic position of tree shrews is unstable.We also found that two of three exonic indels reported as synapomorphies of Euarchonta in a previous study do not unambiguously support the monophyly of such a clade.Therefore,the monophyly of both Euarchonta and Sundatheria(Dermoptera+Scandentia)are suspect.Molecular dating and divergence rate analyses suggested that the ancestor of Euarchontoglires experienced a rapid divergence,which may cause the unresolved position of tree shrews even using the whole genomic data.
基金
We thank Tingting Zhang for her suggestion in the discussion and Dr Junxiao Xu for his help with computer language.We thank Professor Liang Liu at Delaware State University for his help in species tree reconstruction.We also sincerely appreciate the thoughtful and constructive comments from Szucsich Nikolaus and the other anonymous reviewer.This research was supported by the major project of the Natural Science Foundation of the Jiangsu Higher Education Institutions of Jiangsu Province,China(07KJA18016)(to G.Y.)
the National Key Technology R&D Program of China(2013BAD03B02)
the National Natural Science Foundation of China(No.31270420)(to M.L.).
