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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Large variety: long & thick
E. mutabilis 160 x 21 μm Ko-sumida river Kasukabe Saitama, 2006	E. mutabilis 156 x 17 μm Omiya Saitama, 2001	E. mutabilis 150 x 19 μm Owada Park Saitama, 2005	E. mutabilis 150 x 15 μm Watasuge marsh Tsugaike highland Nagano, 2005
E. mutabilis 150 x 15 μm Gunma-no-suigo Itakura Gunma, 2006	E. mutabilis 160 x 12 μm Onnenai Kushiro marsh Hokkaido, 2005	E. mutabilis 145 x 12 μm Gozaisho marsh Hachimantai Iwate, 2005	E. mutabilis 120 x 15 μm Fujimi Saitama, 2004
E. mutabilis 125 x 13 μm Shirahata-Numa Urawa Saitama, 2005	E. mutabilis 125 x 14 μm Mihashi Park Saitama Saitama, 2005	E. mutabilis μm drainage ditch Kawajima Saitama, 2008

Similar species -->> Unidentified sp.;

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