Species: 20-35 μm long, 5-10 μm wide; spindle-form with bluntly pointed anterior and sharply attenuated posterior end; a few chloroplasts (Kudo, 1966). 2 leaf-like chloroplasts (Illustrations of The Japanese Fresh-water Algae, 1977). Cell body fusiform, 21-32 μm long, 8-11 μm wide; anterior rounded, posterior bluntly pointed or rounded; 2-3 chloroplasts large, saucer-shaped with slightly lobed margins, 15-24 μm in diam., each containing a pyrenoid covered on both sides by a watchglass-shaped sheath of paramylon; nucleus 6 μm in diam. located posterior; flagellum 1-1.5 body length; stigma (eyespot) 3-4 μm long; muciferous bodies small, spherical; paramylon granules small, oval or elliptiocal (Phtomicrog. Fresh-w. Alg. 9: 37, 1989).

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Cell body more than 30 μm long
E. agilis ? 45 x 12 μm water reservoir near Yamaguchi Univ. Yamaguchi, 2004	E. agilis 38 x 14 μm near Isa-numa Kawagoe Saitama, 2005	E. agilis 41 x μm posterior pointed Maeda Furukawa Miyagi, 2003	E. agilis 40 x 10 μm posterior pointed Haneo Namegawa Saitama, 2004
E. agilis 27-35 μm posterior pointed Nishi-Urawa Saitama, 2001	E. agilis 34 x μm river bank Doman-green Park Saitama, 2003	E. agilis 33 x 12 μm Sunaga Higashi-matsuyama Saitama, 2004	E. agilis 33 x 10 μm Haneo Namegawa Saitama, 2004
E. agilis 33 x 9 μm Ranzan town Saitama, 2003	E. agilis 33 x 12 μm near Oppe river Kawajima Saitama, 2005	E. agilis 32 x 9 μm Sashi-ohgi Saitama, 2002	E. agilis 31 x 11 μm Sukawa highland Kurikoma mountain Akita, 2005
E. agilis 30 x 14 μm Mihashi Park Saitama, 2002	E. agilis 30 x 7.5 μm Misato town Saitama, 2003
Cell body 20-30 μm long
E. agilis 28-30 x 8-9 μm Ushiku Ibaraki, 2002	E. agilis 20-30 μm Japan, 199?	E. agilis 27 x 9 μm Ujiie (Sakura) Tochigi, 2001	E. agilis 25-30 μm Kami-karako Higashi-matsuyama Saitama, 2003
E. agilis 29 x 8 μm Minowada Moroyama Saitama, 2004	E. agilis 29-31 x 8 μm Ohmido Kamisato Saitama, 2004	E. agilis 30 x 8 μm drainage ditch Sakura Chiba, 2008
stock Ujie-2-1a axenic culture Ujiie (Sakura) Tochigi, 2001	E. agilis ? 27 x 9 μm Koshigaya Saitama, 2001	E. agilis ? 27 x 9 μm posterior pointed Shishizuka Tsuchiura Ibaraki, 2003	E. agilis ? 26 x 9 μm posterior rounded Kodama Saitama, 2003
E. agilis 26 x 8 μm Takamatsu Kagawa, 2002	E. agilis 25 x 8 μm Toda Saitama, 2002	E. agilis 25 x 7 μm Hasuda Saitama, 2002	E. agilis 25 x 7.5 μm Misato town Saitama, 2003
E. agilis 28 x 9 μm near Town Hall Shobu Saitama, 2004	E. agilis 23 x 6 μm Wan-park-land Kochi, 2002	E. agilis ? 23 x 10 μm Mizuko-kaizuka Fujimi Saitama, 2004	E. agilis 21 x 7 μm Nanbata-shinden Fujimi Saitama, 2004
E. agilis 23 x 7.5 μm Shigesato Tsukuba Ibaraki, 2007	stock Syos-2 E. agilis ? 35 x 17 μm Hitotsugi Yoshimi Saitama, 2004
Cell body less than 20 μm long
E. agilis ? or similar sp. 18 x 9 μm Koshigaya Saitama, 2001	E. agilis or similar sp. 17 x 9 μm Ueno Tokyo, 2001	E. agilis μm Iruma Saitama, 2003

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