Phylogenetic relationships among cetartiodactyls based on insertions of short and long interpersed elements: Hippopotamuses are the closest extant relatives of whales
Phylogenetic relationships among cetartiodactyls based on insertions of short and long interpersed elements: Hippopotamuses are the closest extant relatives of whales
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DOI：
10.1073/pnas.96.18.10261
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发表时间：
1999-08-31
影响因子：
11.1
通讯作者：
Okada, N
中科院分区：
文献类型：
--
作者：
Nikaido, M;Rooney, AP;Okada, N
长短散布元件的插入分析是系统发育推断的一种有效方法。在以前的研究短散置元素的数据，发现鲸类，，反刍动物形成一个单系群。为了进一步解决这些类群之间的关系，我们现在已经分离和表征10个额外的位点。对这些数据的系统发育分析能够解决主要的鲸偶蹄类群体之间的关系，从而阐明鲸鱼的起源。结果表明：（i）鲸类动物是深嵌套在偶蹄目动物，（ii）鲸类和剑尾鱼形成一个单系类群，（iii）猪和野猪形成一个单系类群，排除剑尾鱼，（iv）雪佛兰首先在反刍动物中分化，（v）骆驼首先在鲸偶蹄目动物中分化。这些发现使我们得出结论，鲸类动物进化从一个直接的偶蹄类，而不是mesonychian，祖先。
Insertion analysis of short and long interspersed elements is a powerful method for phylogenetic inference. In a previous study of short interspersed element data, it was found that cetaceans, hippopotamuses, and ruminants form a monophyletic group. To further resolve the relationships among these taxa, we now have isolated and characterized 10 additional loci. A phylogenetic analysis of these data was able to resolve relationships among the major cetartiodactyl groups, thereby shedding light on the origin of whales. The results indicated (i) that cetaceans are deeply nested within Artiodactyla, (ii) that cetaceans and hippopotamuses form a monophyletic group, (iii) that pigs and peccaries form a monophyletic group to the exclusion of hippopotamuses, (iv) that chevrotains diverged first among ruminants, and (v) that camels diverged first among cetartiodactyls. These findings lead us to conclude that cetaceans evolved from an immediate artiodactyl, not mesonychian, ancestor.