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Euglenophyceae: Euglenales
Mastigophora: Euglenida

Euglena gracilis
Klebs 1883

Euglena gracilis Species: 35-55 μm long, 6-25 μm wide; cylindrical to elongate ovate; highly plastic; fusiform chloroplasts variable in number (Kudo, 1966). Less than 20 chloroplasts; paramylon (paramylum) body attached to each side of each chloroplast; tolerance of wide range of acidity, pH 3.5-9.9 (How to know the protozoa, 1979). 35-65 μm long, 5-15 μm wide; swim rapidly; chloroplasts 6-12 per cell, large flat, shield-shaped (Illustrated guide, 1985).
Cell body fusiform or cylindrical, 40-65 μm long, 7-13 μm wide, posterior somewhat pointed, euglenoid movement active; chloroplasts saucer-shaped with wavy margin, 6-16 in number, a pyrenoid covered with paramylon sheath located at the center; a flagellum 1/2 to 2/3 of the body length; nucleus nearly spherical 7-8 μm in diam., stigma 3 μm (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).


Euglena gracilis, tapered at rear, several large chloroplasts parietal, x 400, x 640, Tsukuba city, Ibaraki Pref., Japan, October 2000, collected by N. Kinoshita, photo 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 gracilis Euglena gracilis

Euglena gracilis, axenic culture (2PPYG), 53 μm long, 8 μm wide, tapered at rear, several large chloroplasts parietal, x 400, x 640, Tsukuba city, Ibaraki Pref., October 2000, collected by N. Kinoshita, photo 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 gracilis Euglena gracilis Euglena gracilis Euglena gracilis Euglena gracilis Euglena gracilis Euglena gracilis Euglena gracilis Euglena gracilis Euglena gracilis Euglena gracilis Euglena gracilis Euglena gracilis Euglena gracilis

Euglena gracilis, axenic culture (4YN), x 400, x 640, Tsukuba city, Ibaraki Pref., October 2000, collected by N. Kinoshita, photo 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 gracilis Euglena gracilis


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