| Monophyly or polyphyly? Possible conflict between morphological and molecular interpretations of the wellknown genus Zoothamnium(Ciliophora,Peritrichia) |
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| 引用本文： | 李丽芳,马洪钢.Monophyly or polyphyly? Possible conflict between morphological and molecular interpretations of the wellknown genus Zoothamnium(Ciliophora,Peritrichia)[J].中国海洋与湖沼学报,2015,33(2):490-499. |
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| 作者姓名： | 李丽芳 马洪钢 |
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| 作者单位： | Marine College,Shandong University;Institute of Evolution & Marine Biodiversity,Ocean University of China;Zoology Department,King Saud University |
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| 基金项目： | Supported by the National Natural Science Foundation of China(Nos.31071898,31111120437);the Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry of China;the Key Laboratory of Mariculture(KLM),Ministry of Education,Ocean University of China,the Research Group Project(No.RGP-VPP-083);the King Saud University Deanship of Scientific Research |
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| 摘 要： | 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,Z oothamnium 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 r RNA) 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).
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| 关 键 词： | peritrichous ciliates Zoothamnium phylogenetic analyses monophyly polyphyly |
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