Genus: Body form barrel-shaped; with regularly arranged ectoplasmic plates; cytostome at anterior end, surrounded by slightly longer cilia; often spinous projection at or near posterior end; one or more long caudal cilia (Kudo, 1966). Species:

50 μm 100 μm 150 μm; x 400

Images of collecting locality: Tane-ike (pond), Togakushi highland, Shinano town, Nagano Pref., Japan, May 21, 2006 by Y. Tsukii