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);

31 μm 63 μm 94 μm; x 640