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Euglenophyceae: Euglenales
Mastigophora: Euglenida

 Euglena acus
Ehrenberg, 1830

Euglena acus Species: 50-175 μm long, 8-18 μm wide; body long spindle or cylindre, with a sharply pointed posterior end; numerous discoid chloroplasts; several paramylon (paramylum) bodies; nucleus central; stigma distinct; flagellum short, about one-fourth the body length (Kudo, 1966).
Similar species -->> Cyclidiopsis; E. limnophila;

Euglena acus small variety ? (or E. limnophila ?), cell body 50 μm long, 7 μm wide, sharply pointed posterior end, chloroplasts disc-shaped, 2.5-3 μm in diam., paramylon bodies thin rod-shaped, 10 μm long, 0.7 μm wide, flagellum short, x 400, x 640, Saitama Pref., Japan, May-June 1999, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Euglena acus Euglena acus Euglena acus Euglena acus

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