Genus: Similar to Ochromonas, but colourless;
cells ovoid, free-swimming, or attached by a protoplasmic thread, or mutually attached to form
spherical colonies; 1 contractile vacuole (Illustrated Guide, 1985).
cell body 9 μm long, 6 μm wide,
x 640, Kami-takayanagi, Kisai town, Saitama Pref., Japan, June 2003 by Y. Tsukii
150 μm; x 400