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Two new marine ciliates, Euplotes sinicus sp. nov. and Euplotes parabalteatus sp. nov. with new SSU rRNA gene sequence of Euplotes rariseta (Ciliophora; Spirotrichea; Euplotida)

¹ Laboratory of Protozoology;
² King Saud University

³ E-mail: xiaozhonghu{at}ouc.edu.cn

The morphology, infraciliature and silverline system of two marine Euplotes, i.e. E. sinicus sp. nov. and E. parabalteatus sp. nov., isolated from the seawater near Qingdao, China, were investigated. E. sinicus is characterized by having conspicuous dorsal ridges, single marginal cirrus and silverline system of double-patella-I type. E. parabalteatus is an extremely small form (only about 35 µm long) with 6-7 dorsal kineties and silverline system of double-eurystomus type. Meanwhile, the SSU rRNA gene of another rare, morphologically similar form, E. rariseta was sequenced. The SSU rRNA based phylogenetic trees constructed with three different methods firmly demonstrate that the new species represent two distinct phylogenetic lineages within the genus Euplotes, branching in sister position to other sequenced congeners. Additionally, present work reveals the phylogenetic position of E. rariseta, which is basal to one major group of Euplotes, rather than close to E. nobilii.