Genus (Claparède and Lachmann, 1858): Ovoid or cylindrical; apical cytopharynx; posterior bald; caudal cilia present; contractile vacuole posterior (Carey, 1992). Species:

50 μm 100 μm 150 μm; x 400

Images of collecting locality: No. 2, Teganuma Biotope, Abiko city, Chiba Pref., Japan, February 17, 2008 by Y. Tsukii