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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/5675

Title: Reconsideration of the phylogenetic position of frontonia-related peniculia (ciliophora, protozoa) Inferred from the small subunit ribosomal RNA gene sequences
Authors: Gao, Shan
Chen, Zigui
Shao, Chen
Long, Hongan
Al-Rasheid, Khaled A. S.
Song, Weibo
Keywords: SS rRNA
Frontonia lynni
Issue Date: 2008
Citation: Acta Protozool: 47; 47–54
Abstract: For a long time, the class Oligohymenophorea de Puytorac et al., 1974 has been morphologically characterized as a distinct and monophyletic assemblage. However, its relationship of some taxa, especially the Frontonia-related Peniculia have not been much concerned yet using molecular techniques. In this report, the SS rRNA genes for three congeners of Frontonia, namely F. lynni, F. tchibisovae and F. didieri, were sequenced and characterized. Phylogenetic trees were constructed by means of Bayesian, neighbor-joining (NJ), leastsquares (LS) and maximum parsimony (MP) to assess the inter- and intra-generic relationships of the class Oligohymenophorea. All trees show similar topologies with stable bootstrap support and indicate that: (1) four well known groups, i.e., Peritrichia, Hymenostomatia, Scuticociliatia and Peniculia are distinctly outlined within the class Oligohymenophorea; (2) members of Frontonia are likely more divergent, that is, morphotypes assigned into this genus based on traditional methods might belong to different assemblages, which hence conflicts with the separation of Apofrontonia from the family Frontoniidae, in which the genus Frontonia locates; (3) Apofrontonia always clusters with Paramecium and then groups with the closely related genus Frontonia. In contrast to investigations based on morphology and morphogenesis, the SS rRNA gene sequence determines that the well-outlined genus Frontonia appears to be a paraphyletic assemblage, in which the morphotype Frontonia didieri is more closely related to Apofrontonia than to its congeners.
Description: 1) Laboratory of Protozoology, KLM, Ocean University of China, Qingdao, 266003, China; 2) Zoology Department, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia
URI: http://hdl.handle.net/123456789/5675
Appears in Collections:College of Science

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