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Euglenophyceae: Euglenales
Mastigophora: Euglenida

 Euglena oxyuris
Schmarda

Euglena oxyuris 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).
Similar species -->> tripteris; E. gigas; E. gaumei;

Euglena oxyuris, cell body 240 μm long, 30 μm wide, x 400, Japan, 199? by Y. Tsukii (right)
scale 50 μm scale 100 μm scale 150 μm; x 400
Euglena

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