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 11 samples 125-160 x μm 2001-2008	E. mutabilis 11 samples 125-160 x μm 2001-2008	E. mutabilis 11 samples 125-160 x μm 2001-2008	E. mutabilis 11 samples 125-160 x μm 2001-2008
Medium size
E. mutabilis 39 samples 70-150 x μm 2000-2008	E. mutabilis 39 samples 70-150 x μm 2000-2008	E. mutabilis 39 samples 70-150 x μm 2000-2008	E. mutabilis 39 samples 70-150 x μm 2000-2008
Small & thin variety
E. mutabilis 37 samples 33-105 x μm 1999-2008	E. mutabilis 37 samples 33-105 x μm 1999-2008	E. mutabilis 37 samples 33-105 x μm 1999-2008	E. mutabilis 37 samples 33-105 x μm 1999-2008

Similar species -->> Unidentified sp.;

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