Euglenophyceae: Euglenales
Mastigophora: Euglenida

 Euglena gigas
Drezepolski
= Euglena helicoidea

Species: 198-360 μm long, 20-40 μm wide; long cylindrical, somewhat flattened and slightly-twisted; anterior end rounded, posterior end pointed; numerous discoid chloroplasts; many rod-shaped paramylon (paramylum) bodies; no pyrenoids; nucleus big, cylindrical, lying in the center; stigma large (Zakrys, 1986).

Euglena gigas, cell body 390 μm long, 35 μm wide, large paramylon bodies, rod-shaped, 40 μm long, 10 μm wide, x 400, x 640, August 7-13 1999, Vermont-Maine U.S.A., 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 gigas, cell body 360 μm long, 40 μm wide, chloroplasts small disc-shaped, about 4 μm in diam., x 200, x 400, x 640, August 7-13, 1999, Vermont-Maine U.S.A., 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 gigas, cell body 380 μm long, 38 μm wide, x 400, x 640, August 7-13 1999, Vermont-Maine U.S.A., 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 gigas, cell body 370 μm long, 50 μm wide, x 400, x 640, Aug. 7-13 1999, Vermont-Maine U.S.A., 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

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