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).