Genus: Ovoid, inhabiting a mucilaginous sac or lorica; vestibulum large and shallow, occupying 1/3 of ventral surface; on the right of the vestibulum lie a short row of long curved cilia; a macronucleus; contractile vacuole subterminal (Carey, 1992). Species:

31 μm 63 μm 94 μm; x 640

Images of collecting locality: Hazama marsh, Tomita, Ashikaga city, Tochigi Pref., Japan, April 22, 2006 by Y. Tsukii