Species: 85-170 μm long, 10-20 μm wide; highly plastic; stigma distinct; chloroplasts discoid with pyrenoid; several small rod-shaped paramylon (paramylum) bodies (Kudo, 1966). Body flattened, twisted, with longitudinal chloroplasts; flagellum less than 1/4 body length (How to know the protozoa, 1979).
Cell body cylindrical, 90-165 μm long, 9-18μm wide, posterior slightly pointed; chloroplast large disc-shaped, parietal, 30-50 in number, a pyrenoid without paramylon sheath located at the center; a flagellum 1/3 to 1/2 of the body length; nucleus ellipsoidal 14-20 x 8-12 μm; stigma 5-7 μm; paramylon bodies ellipsoidal or rod-shaped (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

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Large variety: more than 200 μm long
E. deses 210 x 24 μm L/W=8.8 chl. 8 x 6 μm para. 22 x 4-8 μm Nishi-Urawa Saitama, 2003	E. deses 200 x 17 μm L/W=11.8 chl. 9 x 5 μm para. 15-18 μm Uruguay, 2001	E. deses 210 x 15 μm L/W=14.0 chl. 7-14 μm Furu-tone river Kasukabe Saitama, 2004	E. deses 210-215 x 14-20 μm L/W=11-15 chl. 7-14 μm Jionji-shinsui p. Iwatsuki-ku Saitama, 2006
E. deses 170 x 20 μm L/W=8.5 chl. μm near Okubo ike Shinano Nagano, 2004	E. deses ? 205 x 27 μm L/W=7.6 chl. μm pyrenoid present para. μm Kitamoto nature o.p. Kitamoto Saitama, 2005	E. deses ? 190 x 28 μm L/W=6.8 chl. μm pyrenoid present para. μm Mitsumata-numa Kawagoe etc. Saitama, 2005

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