Further insights into the phylogeny of two ciliate classes Nassophorea and Prostomatea (Protista, Ciliophora)
Further insights into the phylogeny of two ciliate classes Nassophorea and Prostomatea (Protista, Ciliophora)
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进一步了解两个纤毛虫纲 Nassophorea 和 Prostomatea（Protista、Ciliophora）的系统发育。
DOI：
10.1016/j.ympev.2013.09.015
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发表时间：
2014-01-01
影响因子：
4.1
通讯作者：
Song, Weibo
中科院分区：
文献类型：
--
作者：
Zhang, Qianqian;Yi, Zhenzhen;Song, Weibo
在纤毛门的形态多样性和高级分类中，织口纲和前口纲是两个关键纲。然而，它们与大核内亚门内其他纤毛虫的系统发育关系仍然难以捉摸。在本研究中，我们研究了这些群体基于小亚基和大亚基（SSU和LSU）rRNA基因的系统发育，并研究了包括几个关键物种在内的其他分类群的序列。结果表明：（1）在SSU系统树中，小胸亚纲与Phyllopharyngea聚为一群，而鼻孔目是CONthreeP超进化枝的一个基群;（2）在系统树中，Prostomatea不是一个单系群，统计树拓扑学检验几乎否定了该纲的单系性;（3）拟帚虫属与Colpodididae的亲缘关系比帚虫属更近，（4）拟帚虫属在SSU树和LSU树中与寡水囊虫属的Peniculidae亲缘关系较近，以前被认为是一种鼻虫;（5）微胸藻属Discotricha在SSU和LSU树中均不与其它微胸藻属群在一起，（6）斜螯科与前列腺寄生虫刺激隐核虫和原齿目尾鞭虫科关系密切;（7）Placidae科，以Placussalinus为代表，是原齿目Holophryidae科的姐妹。根据目前的资料，我们认为盘毛属是一个未分类的分类单元内CONthreeP。我们还建议复活的命令Paranassulida和分类它在亚类Peniculia，类Oligohydrophorea。提供了Phyllopharyngea和Nassophorea内高等类群的一级和二级结构特征。(C)2013 Elsevier Inc. All rights reserved.
The Nassophorea and Prostomatea are two of the key classes in understanding the morphological diversification and higher classification of the phylum Ciliophora. However, their phylogenetic relationships with other ciliate groups within the subphylum Intramacronucleata remain elusive. In this study, we investigated the small and large subunit (SSU and LSU) rRNA gene-based phylogeny of these groups with sequences of additional taxa including several key species. The results show that: (1) the class Nassophorea remains polyphyletic, with the microthoracids clustering with the Phyllopharyngea, whereas the nassulids represent a basal group of the CONthreeP superclade in the SSU tree; (2) the Prostomatea is not depicted as a monophyletic group in phylogenetic trees, and the monophyly of this class is marginally rejected by statistical tree topology tests; (3) the nassulid genus Parafurgasonia is more closely related to the family Colpodidiidae than to Furgasonia; (4) Paranassula, which was previously thought to be a nassulid, is phylogenetically related to the oligohymenophorean peniculids in both the SSU and LSU trees; (5) the microthoracid genus Discotricha does not group with the other microthoracids in either SSU or LSU trees; (6) the family Plagiocampidae is closely related to the prostome parasite Cryptocaryon irritans and to the family Urotrichidae in the order Prorodontida; and (7) the family Placidae, represented by Placus salinus, is sister to the family Holophryidae in the order Prorodontida. Based on the present data, we consider the genus Discotricha to be an unclassified taxon within the CONthreeP. We also propose resurrecting the order Paranassulida and classifying it within the subclass Peniculia, class Oligohymenophorea. Primary and secondary structure signatures for higher taxa within Phyllopharyngea and Nassophorea are supplied. (C) 2013 Elsevier Inc. All rights reserved.