Phylogeny of the stichotrichia (Ciliophora; Spirotrichea) reconstructed with nuclear small subunit rRNA gene sequences: Discrepancies and accordances with morphological data
Phylogeny of the stichotrichia (Ciliophora; Spirotrichea) reconstructed with nuclear small subunit rRNA gene sequences: Discrepancies and accordances with morphological data
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DOI：
10.1111/j.1550-7408.2007.00250.x
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发表时间：
2007-03-01
影响因子：
2.2
通讯作者：
Foissner, Wilhelm
中科院分区：
文献类型：
--
作者：
Schmidt, Stephanie L.;Bernhard, Detlef;Foissner, Wilhelm
Stichotrichia 被认为是一个特别多样化且分类学上困难的类群，近年来通过形态学、形态发生和分子方法进行了深入研究。然而，缺乏一致的分类，并且有关该组内系统发育关系的几个重要问题仍未解决。为了更深入地了解这些关系，对七种刺毛虫（尖毛虫科、两栖科和拟尿刺毛虫科的代表）的核小亚基 rRNA 基因进行了系统发育分析。尽管我们的分析导致系统发育关系的分辨率较差，但可以得出一些结论。首先，按照当前的分类系统，尖毛科及其亚科似乎是并系系，并且基本的 18 FVT 旋状模式已经独立修改了多次。其次，对几种尖毛虫物种的序列分析导致了高分子多样性，这不支持该属的单系性。第三，Urostylidae 目（Urostylidae、Pseudokeronopsidae 和 Pseudoourostylidae）的几个科也不形成单系群。
The Stichotrichia, known as an especially various and taxonomically difficult group, were intensely studied with morphological, morphogenetic, and molecular methods in the last years. Nevertheless, a consistent classification is lacking and several important questions about the phylogenetic relationships within this group remain unsolved. In order to gain deeper insights into these relationships, the nuclear small subunit rRNA genes of seven species of the Stichotrichia, representatives of the families Oxytrichidae, Amphisiellidae, and Pseudourostylidae, were phylogenetically analysed. Although our analyses resulted in a poor resolution of the phylogenetic relationships, some conclusions can be drawn. Firstly, following the current classification systems the Oxytrichidae as well as their subfamilies seem to be paraphyletic and the basic 18 FVT cirral pattern has been modified several times independently. Secondly, sequence analyses of several Oxytricha species resulted in a high molecular diversity, which does not support monophyly of this genus. Thirdly, several families of the order Urostylida (Urostylidae, Pseudokeronopsidae, and Pseudourostylidae) also do not form monophyletic groups.