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Euglenophyceae: Euglenales (or Colaciales)

Colacium mucronatum
Bourrely et Chadefaud, 1948

Colacium mucronatum Genus: Cell body attached to others by gelatinous stalk emerging from anterior end; cell division occurs on the stalk forming dichotomously branching colony; pellicles soft but euglenoid movement rare; chloroplasts soucer-shaped in some species examined; a pyrenoid present at the center; a canal opened near anterior end; stigma present (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
Species: Cell body spindle-shaped when attached, posterior end pointed, 22-30 μm long, 12-16 μm wide; swimmers also spindle-shaped; chloroplasts soucer-shaped, 10-15 in number; a pyrenoid covered with paramylon sheath located at the inner center; a locomotive flagellum 1.5-2 times longer than the cell body; nucleus spherical, 7-8 μm in diam.; stigma 3-4 μm (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
Similar genus -->> Characium (Chlorophyta); Characiopsis (Heterokonta);

Colacium mucronatum (Colaciaceae, Colaciales, Euglenophyceae), cell body 25 μm long, 7 μm wide, x 640, Fukasaku-gawa Yusuichi, Saitama city, Saitama Pref., Japan, May 2002 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Colacium mucronatum Colacium mucronatum

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