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).