Genus: Four flagella of equal length inserted close together into an anterior papilla;
contractile vacuole anterior (An illustrated guide to freshwater zooplankton in Japan, 2000).
cell body nearly spherical, up to 16 μm long, 15 μm wide,
flagella about 18 μm long, a pyrenoid located at the center of the cell body,
nucleus anterior, stigma located near the base of flagella,
x 640, Ranzan town, Saitama Pref., Japan, June 20, 2004 by Y. Tsukii
94 μm; x 640