Phylogenetic consideration of two scuticociliate genera, Philasterides and Boveria (Protozoa, Ciliophora) based on 18 S rRNA gene sequences.
Phylogenetic consideration of two scuticociliate genera, Philasterides and Boveria (Protozoa, Ciliophora) based on 18 S rRNA gene sequences.
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DOI：
10.1016/j.parint.2010.07.002
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发表时间：
2010-12
影响因子：
1.9
通讯作者：
F. Gao;Xinpeng Fan;Zhenzhen Yi;M. Strüder-Kypke;Weibo Song
中科院分区：
文献类型：
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作者：
F. Gao;Xinpeng Fan;Zhenzhen Yi;M. Strüder-Kypke;Weibo Song
许多scuticociliates是水生生物的兼性寄生虫，是最有问题的纤毛虫类群之间的系统关系。主要原因是大多数物种，特别是在Thigmotrichida的分类群具有相似的形态，尚未使用分子方法进行研究。本研究对以两种罕见寄生虫为代表的盾纤毛类属Philippendes armatalis（Philippenda）和Boveria subcylindrica（Thigmotrichida）进行了研究，并根据18 S rRNA基因序列构建了这两个属的系统发育树。结果表明：（1）Philippedes与Philaster形成姐妹群，支持Philippedes和Philaster同属Philippedae的分类;（2）确认命名种Philippedes dicentrarchi Dragesco et al. 1995应该是Miamiensis avidus的一个初级异名，这一点在以往的研究和本工作中所揭示的数据中都得到了证实; 3）鲜为人知的变型B。subcylindrica是迄今为止可获得其分子数据的唯一成员，它总是与高度特化的scuticociliate（一种高度特化的scuticociliate）Cyclidium glaucoma聚类，表明Thigmotrichida和Pleuronematida之间的姐妹关系。
Many scuticociliates are facultative parasites of aquatic organisms and are among the most problematic ciliate taxa regarding their systematic relationships. The main reason is that most species, especially taxa in the order Thigmotrichida have similar morphology and have not been studied yet using molecular methods. In the present work, two scuticociliate genera, represented by two rare parasitic species, Philasterides armatalis (order Philasterida) and Boveria subcylindrica (order Thigmotrichida), were studied, and phylogenetic trees concerning these two genera were constructed based on their 18 S rRNA gene sequences. The results indicate that: 1) Philasterides forms a sister group with Philaster, supporting the classification that these two genera belong to the family Philasteridae; 2) it is confirmed that the nominal species, Philasterides dicentrarchi Dragesco et al., 1995 should be a junior synonym of Miamiensis avidus as revealed by both previous investigations and the data revealed in the present work; and 3) the poorly known form B. subcylindrica, the only member in the order Thigmotrichida, of which molecular data are available so far, always clusters with Cyclidium glaucoma, a highly specialized scuticociliate, indicating a sister relationship between the orders Thigmotrichida and Pleuronematida.