Interordinal relationships and timescale of eutherian evolution as inferred from mitochondrial genome data

被引:94
|
作者
Cao, Y
Fujiwara, M
Nikaido, M
Okada, N
Hasegawa, M
机构
[1] Inst Stat Math, Minato Ku, Tokyo 1068569, Japan
[2] Tokyo Inst Technol, Fac Biosci & Biotechnol, Midori Ku, Yokohama, Kanagawa 2268501, Japan
基金
日本学术振兴会;
关键词
Chiroptera/Eulipotyphla clade; maximum likelihood; molecular phylogeny; multiple references; relaxed molecular clock;
D O I
10.1016/S0378-1119(00)00427-3
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Extensive phylogenetic analyses of the updated sequence data of mammalian mitochondrial genomes were carried out using the maximum likelihood method in order to resolve deep branchings in eutherian evolution. The divergence times in the mammalian tree were estimated by a relaxed molecular clock of the mitochondrial proteins calibrated with multiple references. A Chiroptera/Eulipotyphla (i.e, bat/mole) clade and a close relationship of this clade to Fereuungulata (Carnivora + Perissodactyla + Cetartiodactyla) were reconfirmed with high statistical significance. However, a support for a monophyly of Fereuungulata relative to the Chiroptera/Eulipotyphla clade was fragile, and we suggest that the three branchings among Carnivora, Perissodactyla, Cetartiodactyla and Chiroptera/Eulipotyphla occurred successively in a short time period, estimated to be approximately 77 Myr BP. The Chiroptera/Eulipotyphla divergence was estimated to roughly coincide with the Cretaceous-Tertiary boundary (65 Myr BP). The monophyly of Rodentia, the Lagomorpha/Rodentia clade (traditionally called Glires), and the Afrotheria/Xenarthra clade were preferred over alternative relationships, but the supports of these clades were not strong enough to exclude other possibilities. Although several super-order taxa of eutherians were strongly supported by the analyses of the mitochondrial genome data, the branching order in the deepest part of the eutherian tree remained ambiguous fi om the data presently available. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:149 / 158
页数:10
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