期刊
SYSTEMATIC BIOLOGY
卷 61, 期 1, 页码 150-164出版社
OXFORD UNIV PRESS
DOI: 10.1093/sysbio/syr089
关键词
Laurasiatheria; phylogenomics; rapid divergence; placental mammals
资金
- National Natural Science Foundation of China [30830016]
- Ministry of Education of China [NCET-07-0445]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of Jiangsu Province, China [07KJA18016]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Program for New Century Excellent Talents in University
Although great progress has been made in resolving the relationships of placental mammals, the position of several clades in Laurasiatheria remain controversial. In this study, we performed a phylogenetic analysis of 97 orthologs (46,152 bp) for 15 taxa, representing all laurasiatherian orders. Additionally, phylogenetic trees of laurasiatherian mammals with draft genome sequences were reconstructed based on 1608 exons (2,175,102 bp). Our reconstructions resolve the interordinal relationships within Laurasiatheria and corroborate the clades Scrotifera, Fereuungulata, and Cetartiodactyla. Furthermore, we tested alternative topologies within Laurasiatheria, and among alternatives for the phylogenetic position of Perissodactyla, a sister-group relationship with Cetartiodactyla receives the highest support. Thus, Pegasoferae (Perissodactyla + Carnivora + Pholidota + Chiroptera) does not appear to be a natural group. Divergence time estimates from these genes were compared with published estimates for splits within Laurasiatheria. Our estimates were similar to those of several studies and suggest that the divergences among these orders occurred within just a few million years.
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