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 19 μm long, 14 μm wide, apex flattned,
stigma located at equator, nucleus anterior, a large pyrenoid posterior,
x 640, Sannoh-bori at Sannoh Park, Saitama city, Saitama Pref., Japan, January 9, 2005 by Y. Tsukii
94 μm; x 640