Genus: Euglenas in a close fitting lorica; a single long flagellum extends through small opening; lorica with or without short collar; yellow to brown (How to know the protozoa, 1979). Lorica often possesses numerous spines, composed of ferric hydroxide impregnated with brown manganic compound (Kudo, 1966). Species: Lorica broad ellipsoidal, 17-26 μm long, 13-22 μm wide; collar absent or short cylindrical; surface granulated (Illustrations of The Japanese Fresh-water Algae, 1977).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.2, Iyari marsh, Omachi city, Nagano Pref., Japan, June 4, 2007 by Y. Tsukii