Species: 35-55 μm long, 6-25 μm wide; cylindrical to elongate ovate; highly plastic; fusiform chloroplasts variable in number (Kudo, 1966). Less than 20 chloroplasts; paramylon (paramylum) body attached to each side of each chloroplast; tolerance of wide range of acidity, pH 3.5-9.9 (How to know the protozoa, 1979). 35-65 μm long, 5-15 μm wide; swim rapidly; chloroplasts 6-12 per cell, large flat, shield-shaped (Illustrated guide, 1985).
Cell body fusiform or cylindrical, 40-65 μm long, 7-13 μm wide, posterior somewhat pointed, euglenoid movement active; chloroplasts saucer-shaped with wavy margin, 6-16 in number, a pyrenoid covered with paramylon sheath located at the center; a flagellum 1/2 to 2/3 of the body length; nucleus nearly spherical 7-8 μm in diam., stigma 3 μm (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
Google Image Search
stock Itu-14
47-53 μm
Tsukuba
Ibaraki, 2000
E. gracilis
& Skw-1&2
stigma absent ?
50-55 x 9-10 μm
Kawagoe
Saitama, 2001
E. gracilis
& Nas-1&2
50-60 μm
Sugadaira
Nagano, 2001
E. gracilis
& stock Cis-1&2
45-56 μm
Sendabori
Chiba, 2002
E. gracilis
& stock Stm-1&3
46-59 μm
Chichibu Muse Park
Saitama, 2003
E. gracilis ??
stock Sss-1
80 x 14 μm
pyrenoid with
paramylon sh.
Soka
Saitama, 2002
E. gracilis
50-55 x 9-12 μm
Tsukuba
Ibaraki, 199?
E. gracilis
46-55 x 10 μm
Japan, 1998
E. gracilis
60 x 12 μm
199?
E. gracilis
46 x 9 μm
Shiraoka
Saitama, 2003
E. gracilis
52 x 11 μm
Japan, 1998
Movies 
E. gracilis ?
50 x 14 μm
Japan, 1998
E. gracilis
57 x 9 μm
Kawashima
or Kawajima
Saitama, 2002
E. gracilis ?
60 x 15 μm
Nanbata-shinden
Fujimi
Saitama, 2004
