Species: 70-170 μm long, 25-36 μm wide; cell body cylindrical; anterior rounded and posterior tapered; spiral striation; nucleus posterior; flagellum longer than body; stigma about 7 μm in diam., many fusiform chloroplasts aligned with the striae; numerous haematochrome granules; paramylum bodies ovoid (Kudo, 1966).

50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640

Euglena mutabilis, stock Iti-1, axenic culture with 2PPYG, in flask (5/Feb-9/Feb, 2001), cell body 96 μm long, 10 μm wide, x 640, Tsukuba city, Ibaraki Pref., 2000, collected by N. Kinoshita, photo by Y. Tsukii
31 μm 63 μm 94 μm; x 640

Euglena mutabilis large variety, strain Iti-5, cultured with 2PPYG, cell body 80 μm long, 12 μm wide, x 640, Tsukuba city, Ibaraki Pref., October 2000 by Y. Tsukii
31 μm 63 μm 94 μm; x 640

* Euglena mutabilis Hardy: 70-170 μm long, 25-36 μm wide; cell body cylindrical; rounded anteriorly & tapered posteriorly; spiral striation; nucleus posterior; flagellum longer than body; stigma about 7 μm in diam., many fusiform chloroplasts aligned with the striae; numerous haematochrome granules; paramylum bodies ovoid (Kudo, 1966).

Euglena sanguinea Ehrenberg, 1830 (Syn. E. haematodes (Ehrenberg, 1830) Lemmermann, 1913): 80-170 μm long, 25-45 μm wide; posterior bluntly rounded; flagellum about the body length; pellicle striated; chloroplasts elongated, parallel to the striae; haematochrome granules scattered in sun light and gathered in central area in darkness (Kudo, 1966). Body broadly fusiform; 90-120 μm long, 25-35 μm wide; anterior rounded, posterior tapered with a short process; chloroplasts tasselized and forming chromatophore bands, 12-16 in number; flagellum = body length (Photomicrographs of the Freshwater Algae, 1996).