Mitochondrial genomes from major lizard families suggest their phylogenetic relationships and ancient radiations
Mitochondrial genomes from major lizard families suggest their phylogenetic relationships and ancient radiations
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DOI：
10.1016/j.gene.2006.09.026
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发表时间：
2007-02-15
期刊：
影响因子：
3.5
通讯作者：
Kumazawa, Yoshinori
中科院分区：
文献类型：
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作者：
Kumazawa, Yoshinori
在胎盘哺乳动物和鸟类中，分子数据普遍支持这样一种观点，即它们在白垩纪中期大陆碎裂的良好反应中分化成它们的序数群。然而，这种分歧模式很少被研究的爬行动物，其主要群体之间的系统发育关系尚未建立分子。在这里，我确定了完整或接近完整的线粒体DNA序列从七个蜥蜴家庭和重建主要蜥蜴家庭之间的系统发育关系。当蛇被列入，最大似然分析不支持的蛇varanoids的亲和力的形态学观点，虽然其他几个竞争假说的蛇的位置仍然无法区分大概是由于非常长的分支蛇的血统。我还进行了无时钟贝叶斯分析，以表明主要蜥蜴家族之间的分歧时间集中在三叠纪-侏罗纪时期。因此，蜥蜴包括更深的分歧比哺乳动物和鸟类，他们似乎已经辐射到不同的家庭之前，白垩纪中期的主要大陆分裂。(c)2006 Elsevier B. V.保留所有权利。
In placental mammals and birds, molecular data generally support a view that they diverged into their ordinal groups in good response to mid-Cretaceous continental fragmentations. However, such divergence patterns have rarely been studied for reptiles for which phylogenetic relationships among their major groups have not yet been established molecularly. Here, I determined complete or nearly complete mitochondrial DNA sequences from seven lizard families and reconstructed phylogenetic relationships between major lizard families. When snakes were included, maximum likelihood analysis did not support a morphological view of the snakes-varanoids affinity, although several other competing hypotheses on the position of snakes still cannot be discriminated presumably due to extremely long branches of the snake lineages. I also conducted clock-free Bayesian analyses to show that divergence times between major lizard families were centered in Triassic-Jurassic times. Thus, lizards include much deeper divergences than the mammals and birds and they appear to have already radiated into various families prior to the mid-Cretaceous major continental fragmentation. (c) 2006 Elsevier B.V. All rights reserved.