Genus: Ventral side with a hyaline border, reaching posterior end and bearing trichocysts; dorsal side with either similar trichocyst-border or with trichocyst-warts (Kudo, 1966). Species: Flask-shape to broad leaf-like; ventral seam with trichocysts, undulating; macronucleus moniliform (beaded); contractile vacuole terminal; 300-400 (up to 700) μm long (Kudo, 1966). 370 μm long; bluntly pointed at both ends; trichocyst warts on the dorsal surface; contractile vacuole posterior with a canal extending along the dorsal edge (Carey, 1992).

100 μm 200 μm 300 μm; x 200 : 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