Abstract
Two populations of Epistylis chlorelligerum Shen 1980, a colonial limnetic peritrich ciliate, were collected from different locations in China: E. chlorelligerum 1 from West Lake, Hangzhou; E. chlorelligerum 2 from East Lake, Wuhan. The morphology, infraciliature and SSU rRNA gene sequence of the two populations were investigated based on living and protargol-stained specimens. Although both populations are consistent with previous descriptions of protargol-stained specimens of this species, some differences in the morphology in vivo were observed. The two populations had identical SSU rRNA gene sequences. A second species, Epistylis chrysemydis Bishop and Jahn 1941, was also collected from East Lake, Wuhan, and was investigated for its morphology, infraciliature and SSU rRNA gene sequence. Phylogenetic analyses based on SSU rRNA gene sequence data indicate that the two populations of E. chlorelligerum are nested within the Epistylididae clade near E. wenrichi and E. urceolata. Epistylis chrysemydis is sister to the group comprising E. chlorelligerum, E. wenrichi, and E. urceolata.
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