Order & Family: Floating unicells or a colony embedded in a matrix; no differentiation of apical and base structures; only one family. Genus: Unicells lacking sheath; cell body ellipsoidal, cylindrical or spindle-shaped (Illustrations of The Japanese Fresh-water Algae, 1977).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No. 8, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii