Reconsideration of the systematics of Peniculida (Protista, Ciliophora) based on SSU rRNA gene sequences and new morphological features of Marituja and Disematostoma
Reconsideration of the systematics of Peniculida (Protista, Ciliophora) based on SSU rRNA gene sequences and new morphological features of Marituja and Disematostoma
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基于 SSU rRNA 基因序列和 Marituja 和 Disematostoma 新形态特征对 Peniculida（Protista、Ciliophora）系统学的重新思考
DOI：
10.1007/s10750-017-3371-4
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发表时间：
2018
期刊：
影响因子：
2.6
通讯作者：
Fan Xinpeng
中科院分区：
文献类型：
--
作者：
Xu Yuan;Gao Feng;Fan Xinpeng
纤毛虫是一类单细胞真核生物，在水生生态系统中起着重要作用。纤毛虫分类学的主要任务之一是用现代方法重新评价系统混乱的分类群。本研究采用多方法对采自中国东部的两种纤毛虫--尾海纤毛虫（Maritujacf. caudata）和小双丝口纤毛虫（Disematostoma minor）进行了研究。新的形态观察为Peniculida目的种鉴定和系统修订提供了新的信息。本文报道了M.cf.caudata、D.和Frontonia terricola的特征，为Peniculida的发生提供了新的认识。Stokesiidae Roque，1961年，除了Stokesia模式属之外，还扩展了DisematostomaandMaritujain属，因为这三个属在系统发育分析中形成了一个得到充分支持的分支。改进了Stokesiidae的诊断，以包括新识别的突触形态，即，背侧无毛的动体，具纤毛的背缝，体细胞的纤毛可以被认为是横向定向的圆圈。此外，还对Peniculida的科属系统关系进行了推测。我们认为，更多样化的形态特征，应考虑在系统的修订纤毛虫分类群的诊断性状进行评估。
Ciliated protists are unicellular eukaryotes that play important roles in aquatic ecosystems. One of the major tasks of ciliate taxonomy is to re-evaluate the systematic confusing taxa using modern methods. In the present study, two peniculid ciliates,Maritujacf.caudataandDisematostoma minorcollected from east China, were studied using a multi-method approach. New morphological observations supplied additional information for species identification and systematic revision of the order Peniculida. The small subunit ribosomal RNA gene sequences ofM.cf.caudata,D. minor, andFrontonia terricolawere characterized for the first time and provided new insights into the phylogeny of Peniculida. The family Stokesiidae Roque, 1961, was expanded to include the generaDisematostomaandMaritujain addition to its type genusStokesia, since the three genera formed a well-supported clade in the phylogenetic analyses. The diagnosis of Stokesiidae was improved to include the newly recognized synapomorphies, i.e., barren kinetosomes on the dorsal side, a ciliated dorsal suture, and the somatic ciliature that can be recognized as transversely oriented circles. Additionally, the systematic relationships of the genera and families of Peniculida were hypothesized. We argue that more diversified morphological features should be considered when assessing diagnostic traits for ciliate taxa during systematic revisions.