Multigene analysis of lophophorate and chaetognath phylogenetic relationships
Multigene analysis of lophophorate and chaetognath phylogenetic relationships
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DOI：
10.1016/j.ympev.2007.09.004
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发表时间：
2008-01-01
影响因子：
4.1
通讯作者：
Hausdorf, Bernhard
中科院分区：
文献类型：
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作者：
Helmkampf, Martin;Bruchhaus, Iris;Hausdorf, Bernhard
核编码管家基因的七个串联片段的最大似然和贝叶斯推断分析表明，Lophotrochozoa是单系的，即，苔藓动物门、腕足动物门和蚤状动物门与软体动物和环节动物的关系比与半口动物门或蜕皮动物门的关系更密切。然而，Lophophorates本身形成了一个多系组合。假设，他们是单系和更密切的联系，以Deuterostomia比Protostomia可以排除与近似无偏检验和预期的似然权重检验。此外，还有一个假定的分支-根据我们的分析，phoronids，而不是共享一个更近的共同祖先与苔藓虫比腕足动物。扁形动物是Lophotrochozoa的姐妹群。这两者共同构成了Spiralia。虽然在我们的分析中，毛颚类似乎是蜕皮动物门中Priapulida的姐妹群，但关于毛颚类关系的另一种假设不能被拒绝。(C)2007年爱思唯尔公司All rights reserved.
Maximum likelihood and Bayesian inference analyses of seven concatenated fragments of nuclear-encoded housekeeping genes indicate that Lophotrochozoa is monophyletic, i.e., the lophophorate groups Bryozoa, Brachiopoda and Phoronida are more closely related to molluscs and annelids than to Deuterostomia or Ecdysozoa. Lophophorates themselves, however, form a polyphyletic assemblage. The hypotheses that they are monophyletic and more closely allied to Deuterostomia than to Protostomia can be ruled out with both the approximately unbiased test and the expected likelihood weights test. The existence of Phoronozoa, a putative clade including Brachiopoda and Phoronida, has also been rejected. According to our analyses, phoronids instead share a more recent common ancestor with bryozoans than with brachiopods. Platyhelminthes is the sister group of Lophotrochozoa. Together these two constitute Spiralia. Although Chaetognatha appears as the sister group of Priapulida within Ecdysozoa in our analyses, alternative hypothesis concerning chaetognath relationships could not be rejected. (C) 2007 Elsevier Inc. All rights reserved.