Species: 150-500 μm long,
20-40 μm wide; cylindrical,
almost always twisted; anterior end rounded, posterior end pointed;
numerous discoid chloroplasts; two ovoid paramylon (paramylum) bodies;
stigma large; sluggish (Kudo, 1966).
Body flattened, twisted, with longitudinal groove; two oval paramylon (paramylum) rings
(How to know the protozoa, 1979).
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