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:

31 μm 63 μm 94 μm; x 640

Images of collecting locality: a pond at Ashikaga flower park, Tomita, Ashikaga city, Tochigi Pref., Japan, April 22, 2006 by Y. Tsukii