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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Slender type: 100-200 μm long, L/W=11-15
E. deses 190 x 15 μm L/W=12.7 Kitamoto nature o.p. Kitamoto Saitama, 2005	E. deses 175 x 15 μm L/W=11.7 Akebono-yama p. Kashiwa Chiba, 2006	E. deses 195 x 13,17 μm L/W=11.5,15.0 Oyumi-ike 2 Chuo-ku Chiba, 2007	E. deses 176 x 13 μm L/W=13.5 chl. small, many Okubo Ryoke Akigase park Saitama, 2005
E. deses 170 x 14 μm L/W=12.1 chl. μm Oura Gunma, 2006	E. deses 165 x 11 μm L/W=15.0 chl. μm Mizuko-kaizuka p. Fujimi Saitama, 2004	E. deses 160 x 12 μm L/W=13.3 chl. μm Shimo-muneoka Shiki Saitama, 2004	E. deses 160 x 10 μm L/W=13.3 chl. 4-5 μm Kitamoto nature o.p. Kitamoto Saitama, 2005
E. deses 155 x 11 μm L/W=14.1 chl. μm Tonbo-no-numa Isumi Chiba, 2007	E. deses 150 x 10 μm L/W=15 Hazama marsh Ashikaga Tochigi, 2006	E. deses 145 x 10 μm L/W=14.5 chl. 5-13 μm near Shide-numa Kita-kawabe Saitama, 2005	E. deses 130 x 10 μm L/W=13 Kijioka Castle Ruin Honjo Saitama, 2006
E. deses 115 x 8 μm L/W=14.4 chl. μm Noda Namegawa Saitama, 2004	E. deses 115 x 9 μm L/W=12.8 chl. μm Mizuko Fujimi Saitama, 2003	E. deses 128 x 10-11 μm L/W=11.6-12.8 chl. μm pyrenoid present Kami-karako Higashi-matsuyama Saitama, 2003	E. deses 100 x 9 μm L/W=11.1 chl. μm Hazama marsh Ashikaga Tochigi, 2003
E. deses 110 x 10 μm L/W=11.0 chl. μm Mizuko-kaizuka p. Fujimi Saitama, 2004	E. deses 100 x 9 μm L/W=11.1 chl. μm Gunma-no-suigo Itakura Gunma, 2006

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