Molecular phylogeny of oligotrich genera Omegastrombidium and Novistrombidium (Protozoa, Ciliophora) for the systematical relationships within Family Strombidiidae |
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| Authors: | Qianqian Zhang Zhenzhen Yi Dapeng Xu Khaled A S Al-Rasheid Jun Gong Weibo Song |
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| Institution: | (1) School of Biological Sciences, University of Liverpool, BioSciences Building, Crown Street, L69 7ZB Liverpool, UK;(2) Present address: Department of Biological Sciences, University of Wisconsin—Milwaukee, P.O. Box 413, Milwaukee, WI 53201, USA |
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| Abstract: | The phylogeny of the oligotrich ciliates is currently a hot debate despite the availability of both morphological and molecular
data. In the present paper, further small subunit rRNA (SS rRNA) genes were analyzed from the Genera Omegastrombidium and Novistrombidium, as well as from Strombidium, and combined with three new SS rRNA sequences from Strombidium basimorphum, S. sulcatum population QD-1, and Novistrombidium testaceum population GD. The phylogenetic positions of these organisms were inferred using Bayesian inference, Maximum Likelihood,
and Maximum Parsimony methods. The main results are: (1) the SS rRNA gene sequence analyses match the recent findings about
the molecular evolution of oligotrichs, indicating that the family Strombidiidae is paraphyletic; (2) the Genus Omegastrombidium is separated from the Genus Strombidium, as shown in recent cladistic analyses; (3) morphospecies in Genus Novistrombidium, based on similarity of somatic ciliature, are separated from each other in all topological trees, indicating that this genus
could be a paraphyletic group; (4) the molecular data indicate a possibility of paraphyly for the genus Strombidium; and (5) the similarities of the SS rRNA gene of specimens identified as S. sulcatum and S. inclinatum are 99.8%–100%. However, present knowledge on the oligotrichs sensu stricto is still insufficient and further studies based
on both molecular and other technologies are required. |
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