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).
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