Genus: Ovoid; ciliation uniform; long stiff cilia (bristles) distributed over the body surface; peristome deep, both anterior and posterior regions with a well-developed membranes connected with undulating membrane (velum); two macronucleus; 1-2 micronuclei; several contractile vacuoles; fresh water (Kudo, 1966). Species:

31 μm 63 μm 94 μm; x 640

Images of collecting locality: a small pond at Kitamoto nature observatory park, Kitamoto city, Saitama Pref., February 15, 2007 by Y. Tsukii