Species: 70-170 μm long, 25-36 μm wide; cell body cylindrical; anterior rounded and posterior tapered; spiral striation; nucleus posterior; flagellum longer than body; stigma about 7 μm in diam., many fusiform chloroplasts aligned with the striae; numerous haematochrome granules; paramylum bodies ovoid (Kudo, 1966).

50 μm 100 μm 150 μm; x 400 :

Images of collecting locality: No.3, Tanohara marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 17, 2007 by Y. Tsukii