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 Drezepolski, 
cell body 360 μm long, 38 μm wide, 
x 200, x 400, x 640, Suijo Park, Gyoda city, Saitama Pref., Japan, March 11, 2006 by Y. Tsukii
 50 μm
 100 μm
 150 μm; x 400 : 
 31 μm
 63 μm
 94 μm; x 640
Images of collecting locality: 
Suijo Park, Gyoda city, Saitama Pref., Japan, March 11, 2006 by Y. Tsukii
Ref: 
Drezepolski (1925) Kosmos, 50: 243.
Zakrys, B. (1986) Contribution to the monograph of Polish members of the genus Euglena Ehrenberg 1830, 
Nova Hedwigia, 42: 491-540. 
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