Genus: Unicellular; cell body ellipsoidal or spindle-shaped, attached on a substrate at one end;
a single chloroplast plate-like in shape, with a pyrenoid
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Similar genus --> > Colacium; Characiopsis; Characiochloris; Hydiranum; Characium ?,
cell body 21 μm long, 9 μm wide,
x 640, rice field, near Waku-waku dome, Hamasaki, Asaka city, Saitama Pref., Japan, May 30, 2004 by Y. Tsukii
94 μm; x 640