The morphology and ciliature of a new freshwater ciliate, sp. nov., isolated from an artificial pond in Qingdao, PR China, were investigated using live observation and silver staining methods. The main features separating sp. nov. from its congeners are as follows: a broad elliptical body that is slightly pointed at the posterior end, four ophryokineties, one or two spherical micronuclei of a 'compact' type, a dorsally positioned contractile vacuole, and peniculi 1-3 each with five kinetosome rows though the left-most two rows in peniculus 3 are extremely shortened (with only two or three kinetosomes each). Additionally, an improved diagnosis of is provided. Phylogenetic analyses based on the small subunit ribosomal RNA (SSU rRNA) gene show that sp. nov. clusters with , , and . These five species group with , and rather than with other species, causing polyphyly of the genus .
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