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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/3462

Title: A Unique euplotid ciliate, gastrocirrhus (Protozoa, Ciliophora): assessment of Its phylogenetic position inferred from the small subunitr RNA gene sequence
Authors: Miao, Miao
Song, Weibo
Chen, Zigui
AL-Rasheid, Khaled A.S.
Shao, Chen
Jiang, Jiamei
Guo, Wenbo
Keywords: Hypotrichia
Ribosomal DNA
Secondary structure
Systematic relationship
Issue Date: 2007
Publisher: International Society of Protistologists
Citation: Journal of Eukaryotic Microbiology: 54 (4); 371-378
Abstract: The morphologically unique genus Gastrocirrhus has been considered a distinct but systematically uncertain euplotid due to the absence of both morphogenetic and molecular information. Based on the small subunit rRNA gene sequence, the phylogenetic position of Gastrocirrhus monilifer Ozaki & Yagui, 1942 was re-addressed using multiple algorithms (neighbor-joining, maximum parsimony, least-squares, and Bayesian inference methods). Results indicate that: (1) all phylogenetic trees using different methods are nearly identical in topology, placing G. monilifer closest to Euplotidium arenarium; (2) Gastrocirrhus and Euplotidium form a monophyletic group, namely the family Gastrocirrhidae, and appear to be intermediate taxa bridging the evolution of the Diophrys-Uronychia and Euplotes-complexes (i.e. Euplotes, Certesia, and Aspidisca); (3) the order Euplotida is a paraphyletic group composed of three deeply diverged clades (Euplotes–Certesia–Aspidisca–Gastrocirrhus–Euplotidium; Uronychia–Diophrys; and Prodiscocephalus); (4) together with Prodiscocephalus, the Diophrys-Uronychia complex forms a group at the suborder level and is placed at the root of the order Euplotida, and (5) results from molecular analyses conspicuously challenge the conclusions deduced from morphological as well as morphogenetical investigations—the characteristics traditionally used to define the euplotid taxa at the generic level and/or above may not be uniformly reliable.
Description: a) Laboratory of Protozoology, KLM, Ocean University of China, Qingdao 266003, China, and b) Zoology Department, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia
URI: http://hdl.handle.net/123456789/3462
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