Species: 80-125 μm long, 10-35 μm wide; cylindrical; anterior end a little narrowed and rounded; posterior end drawn out; spiral striae, made up of small knobs; many discoid chloroplasts; two ovoidal paramylon (paramylum) bodies; flagellum about 1/4 the body length; sluggish (Kudo, 1966). 80-180 μm long. Several varieties: var. suprema 140-180 μm, var. marchica, 85-165 micron, var. abruptacuminata, 130-145 μm (How to know the protozoa, 1979). 45-250 μm long, 5-35 μm wide (Illustrated guide, 1985). Cell body 70-96 μm long, 10-14 μm wide, two large paramylon bodies ring-shaped (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

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Large and small knobs present
E. spirogyra 12 samples 180 x 30 μm striae/10 μm knobs μm Fujimi Saitama, 2004	E. spirogyra 165 x 40 μm striae/10 μm knobs μm Fujimi Saitama, 2003	E. spirogyra 160 x 30 μm striae/10 μm Yakebe-ike Higashi-Murayama Tokyo, 2006	E. spirogyra 160 x 28 μm striae/10 μm knobs μm Fujimi Saitama, 2004
E. spirogyra 190 x 30 μm striae/10 μm Ko-numa Minakami Gunma, 2007
E. spirogyra 160 x 25 μm striae/10μm knobs μm Fujimi Saitama, 2003	E. spirogyra 150 x 20 μm 3.3 striae/10μm knobs 1.5 μm Koshigaya Saitama, 2001	E. spirogyra 143 x 24 μm 3.3 striae/10μm knobs 1.5 μm Akigase Park Saitama, 2002	E. spirogyra 145 x 17 μm striae/10μm Okubo Ryoke Akigase Park Saitama, 2005
E. spirogyra 150 μm 6 striae/10μm knobs 1, 1.5 μm anterior conical Nishi-Urawa Saitama, 2001	E. spirogyra 144 x 21 μm 6 striae/10μm knobs 1, 1.5 μm Saitama, 1999	E. spirogyra 140 x 25-32 μm 175 x 23 μm knobs μm Karasu-ga-mori Nasu-shiobara Tochigi, 2006	E. spirogyra 140 x 22-28 μm 118 x 15 μm knobs μm Mitsumata-numa Kawagoe etc. Saitama, 2005
E. spirogyra μm striae/10μm knobs μm Hazama marsh Ashikaga Tochigi, 2003	E. spirogyra μm striae/10μm knobs μm Mizuko Fujimi Saitama, 2003	E. spirogyra 130 x 18 μm striae/10μm knobs μm near Town Hall Shobu Saitama, 2003	E. spirogyra μm striae/10μm knobs μm Mizuko Fujimi Saitama, 2003

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