Monophyly or polyphyly Possible conflict between morphological and molecular interpretations of the well-known genus Zoothamnium (Ciliophora, Peritrichia)

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• 作者：Lifang Li ; Honggang Ma …
• 关键词：peritrichous ciliates ; Zoothamnium ; phylogenetic analyses ; monophyly ; polyphyly
• 刊名：Chinese Journal of Oceanology and Limnology
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：33
• 期：2
• 页码：490-499
• 全文大小：5,127 KB
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• 刊物主题：Oceanography;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-5005

文摘

In this paper, we explore possible conflict between morphological and molecular interpretations of phylogenetic relationships within the well-known peritrichous genus Zoothamnium. On the basis of morphological evidence, for a long time this genus has been believed to be a well-defined monophyletic taxon. Nonetheless, Zoothamnium exhibits higher genetic diversity than the gross morphology of its species. Here, we used all available genetic information for the small subunit of ribosomal RNA (SSU rRNA) and internal transcribed spacer region (ITS1-5.8S-ITS2) for this genus to reconstruct phylogenies for four datasets (SSU rRNA, ITS1, ITS2, and ITS1-5.8S-ITS2) and a combined dataset (SSU rRNA+ITS1-5.8SITS2) using different phylogenetic methods and with consideration of the secondary structure of the genes. Confidence in phylogenetic tree selection was assessed with the approximately unbiased test. The molecular results showed both that Zoothamnium is more likely to be polyphyletic, and morphologically similar genera Zoothamnopsis and Myoschiston were always nested among Zoothamnium species. Accordingly, as with some other groups of ciliates, to understand more fully the correct phylogeny of Zoothamnium there remains a need for additional data from both morphological and molecular studies, covering additional Zoothamnium spp. and members of closely related genera (e.g. Zoothamnopsis, Myoschiston, and Epistylis).