线粒体DNA的系统发育分析表明，异关节总目（贫齿目）和有胎盘类之间存在姐妹群关系。
Phylogenetic analyses of mitochondrial DNA suggest a sister group relationship between Xenarthra (Edentata) and Ferungulates.
作者信息
Arnason U, Gullberg A, Janke A
机构信息
Division of Evolutionary Molecular Systematics, University of Lund, Sweden.
出版信息
Mol Biol Evol. 1997 Jul;14(7):762-8. doi: 10.1093/oxfordjournals.molbev.a025816.
Phylogenetic analysis of 12 protein-coding genes from complete mitochondrial DNA (mtDNA) molecules of various mammals including a xenarthran representative, the armadillo (Dasypus novemcinctus), showed that the order Xenarthra (Edentata) is a sister group to the ferungulates (carnivores, perissodactyls, artiodactyls, cetaceans). Morphological and previous molecular analyses have placed the Xenarthra basal to other extant eutherians. The present findings are in striking contrast with that understanding. The results suggest that Xenarthra and ferungulates separated about 86 MYA.
对包括贫齿目代表动物犰狳（九带犰狳，Dasypus novemcinctus）在内的各种哺乳动物完整线粒体DNA（mtDNA）分子中的12个蛋白质编码基因进行系统发育分析，结果表明贫齿目（异关节总目）是有胎盘类（食肉动物、奇蹄目动物、偶蹄目动物、鲸类）的姐妹群。形态学分析和以往的分子分析均将贫齿目置于其他现存真兽类的基部。目前的研究结果与这种认识形成了鲜明对比。结果表明，贫齿目和有胎盘类在约8600万年前分化。
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