中文摘要：

四个有睫的类(Urostyla， Euplotes， Stylonychia 和 Pseudokeronopsis ) 的种系发生的关系，也是重要环境检查种类，被小子单元 ribosomal RNA 基因序列的比较分析。当其从 hypotrichous 的分叉在深水平排队的一个早分叉的组被吝啬和矩阵分析强烈支持， Euplotes 出现了。分析也支持了有的假设仔细在在 Urostyla 和 Holosticha 的种类之间的关系。姊妹种 Stylonychia mytilus 和 S。lemnae 能被进化分析分开。而且， Pseudokeronopsis rubra 更仔细相对有与在 Holostichidae 的种类的关系比那在 Urostylidae 基于进化距离价值。

英文摘要：

The phylogenetic relationships of four ciliate genera （Urostyla, Euplotes, Stylonychia and Pseudokeronopsis）, which also are the important environment inspection species, were analyzed by the comparison of small subunit ribosomal RNA gene sequences. Euplotes appeared as an early branching group whose divergence from the hypotrichous line at a deep level was strongly supported by parsimony and matrix analyses. The analyses also supported the hypothesis that there were closely relationship between species in Urostyla and Holosticha. The sibling species Stylonychia mytilus and S. lemnae could be separated by the evolutionary analyses. Furthermore, Pseudokeronopsis rubra had relatively more closely relationship with the species in Holostichidae than that in Urostylidae based on the evolutionary distance value.