Species: 70-170 μm long, 25-36 μm wide; cell body cylindrical; anterior rounded and posterior tapered; spiral striation; nucleus posterior; flagellum longer than body; stigma about 7 μm in diam., many fusiform chloroplasts aligned with the striae; numerous haematochrome granules; paramylum bodies ovoid (Kudo, 1966).

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Medium size
E. mutabilis 150 x 9 μm Ukishima marsh Tsugaike highland Nagano, 2005	E. mutabilis 115 x 10 μm Kamino-tanbo Tsugaike highland Nagano, 2006	E. mutabilis 142 x 11 μm Banpaku memorial p. Tsukuba Ibaraki, 2006
E. mutabilis 140 x 11 μm Chigo-ike Shiga highland Nagano, 2006	E. mutabilis 130 x 9 μm Chigo-ike Shiga highland Nagano, 2008
E. mutabilis 108-130 μm Tanohara marsh Shiga highland Nagano, 2006	E. mutabilis 145 x 11 μm Tanohara marsh 3 Shiga highland Nagano, 2007	E. mutabilis 135 x 13 μm Ichinose-enchi Norikura highland Nagano, 2006
E. mutabilis 110 x 9 μm Oyachi marsh Iizuna Highland Nagano, 2005	E. mutabilis 135 x 13 μm Oyachi marsh Iizuna Highland Nagano, 2006	E. mutabilis 130 x 8 μm Kenashitai Hakkoda mountain Aomori, 2005	E. mutabilis 135 x 9 μm Hakkoda Gourd L. Hakkoda mountain Aomori, 2006
E. mutabilis 120 x 8 μm Hakkoda Gourd line Hakkoda mountain Aomori, 2005	E. mutabilis 115 x 12 μm Mizuko Fujimi Saitama, 2003	E. mutabilis 129 x 10 μm Kurobane Tochigi, 2001	E. mutabilis 120 x 11 μm Izumi 741 Namegawa Saitama, 2004
E. mutabilis μm Miyatoko m.7 Minami-Aizu Fukushima, 2008	E. mutabilis 120 x 7 μm near Nan-ko Shirakawa Fukushima, 2003	E. mutabilis 110 x 11 μm Iwajuku Gunma, 2001	E. mutabilis 110 x 10 μm Ikenokochi marsh Tsuruga Fukui, 2004
E. mutabilis 110 x 10 μm Sakitama-kofun p. Gyoda Saitama, 2004	E. mutabilis 100? x 13? μm Hikage marsh Shiga highland Nagano, 2005	E. mutabilis & stock Iti-1 70-105 μm Tsukuba Ibaraki, 2000	E. mutabilis & stock Tti-1c1 70-120 x μm Inari Park Toyama, 2003
E. mutabilis 103 x 8 μm near Karakemi marsh Omachi Nagano, 2005	E. mutabilis 101 x 10 μm Dewa Park Koshigaya Saitama, 2001	E. mutabilis 100 x 10 μm Oyoshi Park Koshigaya Saitama, 2006	E. mutabilis 100 x 10 μm Ikenokochi marsh Tsuruga Fukui, 2004
E. mutabilis 100 x 9 μm Hasu-ike Shiga highland Nagano, 2005	E. mutabilis 100 x 8 μm near Imori pond Myoko highland Niigata, 2004	E. mutabilis 95 x 8 μm Mida-ga-hara Gassan Yamagata, 2005	E. mutabilis 95 x 8 μm Shimo-yanagi Showa Saitama, 2003
E. mutabilis 90 x 10 μm Mihashi Park Saitama, 2002	E. mutabilis μm Yamakado marsh Nishi-Azai Shiga, 2008	E. mutabilis 87 x 11 μm stigma large Iwajuku Gunma, 2001	E. mutabilis > 70 x 15 μm Ikenokochi marsh Tsuruga Fukui, 2004
E. mutabilis 82 x 8 μm Bessho-numa Saitama, 2001	E. mutabilis 85 x 10 μm Iwajuku Gunma, 2001	E. mutabilis 70 x 8 μm Tenbo marsh Tsugaike highland Nagano, 2005

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