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 ovoidal or spindle-shaped, posterior end rounded,
19-30 μm long, 10-12 μm wide;
swimmers also ovoidal or spindle-shaped;
chloroplasts soucer-shaped with a pyrenoid, 5-10 in number;
a locomotive flagellum about 2 times longer than the cell body;
nucleus spherical 6-7 μm in diam., stigma 3-4 μm
(An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).
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