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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Small & thin variety
E. mutabilis 95-105 x 6-7 μm Tanohara marsh Shiga highland Nagano, 2005	E. mutabilis 100 x 6 μm Tanohara marsh Shiga highland Nagano, 2006	E. mutabilis 80 x 7 μm Yoshigadaira m. Shirane mountain Gunma, 2005	E. mutabilis μm Yamakado marsh Nishi-Azai Shiga, 2008
E. mutabilis 75 x 6.5 μm Ohyachi Kazuno Akita, 2007	E. mutabilis 80 x 8 μm Shibakusadaira Zao mountain Miyagi, 2007	E. mutabilis 75 x 6 μm Numa-no-hara m. Madarao highland Niigata, 2005	E. mutabilis 70 x 5.5 μm Midagahara m. Tate-yama Toyama, 2006
E. mutabilis 85 x 4 μm Oze-ga-hara Katashina Gunma, 2006	E. mutabilis 72 x 5.5 μm Shijuhachi-ike Shiga highland Nagano, 2006
E. mutabilis ? 78 x 9 μm Japan, 1999	E. mutabilis 75 x 7 μm Ohmido Kamisato Saitama, 2004	E. mutabilis 75 x 6 μm Komado marsh Showa and Tajima Fukushima, 2004	E. mutabilis 65 x 6 μm 58 x 6 μm near Imori pond Myoko highland Niigata, 2004
E. mutabilis 72, 73 x 6 μm Omotsubo marsh Tetta-cho Okayama, 2004	E. mutabilis 62 x 5 μm Omotsubo marsh Tetta-cho Okayama, 2004	E. mutabilis 70 x 6 μm Kaga Ishikawa, 2000	E. mutabilis 68 x 6 μm Hakama marsh Madarao highland Niigata, 2005
E. mutabilis μm Numappara marsh Kuroiso Tochigi, 2003	stock Tknu-2 50-58 x 7-9 μm Numappara marsh Kuroiso Tochigi, 2003	E. mutabilis μm Senjo-ga-hara Nikko Tochigi, 2003	E. mutabilis μm Otsuka-ike Mito Ibaraki, 2003
E. mutabilis 55 x 4.5-5 μm Koigakubo marsh Tessei-cho Okayama, 2004	E. mutabilis 60 x 7 μm Watarase Wetland Fujioka Tochigi, 2005	E. mutabilis & stock Ikk-1,4,5 33-64 x 7-10 μm axenic Kaga Ishikawa, 2000	E. mutabilis 70 x 5 μm Kisuge konuma Shimogo Fukushima, 2005
E. mutabilis 45 x 7 μm Koigakubo marsh Tessei-cho Okayama, 2004	E. mutabilis 69 x 6 μm Shibu-ike Shiga highland Nagano, 2005	E. mutabilis 80 x 7 μm Shibu-ike Shiga highland Nagano, 2006
E. mutabilis 55 x 5 μm Kenashitai Hakkoda mountain Aomori, 2005	E. mutabilis 50 x 4 μm Mida-ga-hara 9 Gassan (mt) Yamagata, 2006	E. mutabilis 57 x 5 μm Utsubo-numa Zao mountain Yamagata, 2008
E. mutabilis 60 x 5 μm Hachiman-numa 2 Hachimantai Iwate, 2006	E. mutabilis 50 x 5 μm Karakemi marsh Omachi Nagano, 2006	E. mutabilis 56 x 6 μm Tanohara Natural p. Ontake highland Nagano, 2005	E. mutabilis μm Hakkoda Gourd line Hakkoda mountain Aomori, 2005
E. mutabilis μm Yamamuro marsh Maibara Shiga, 2008

Similar species -->> Unidentified sp.;

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