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 --> > Characiopsis; Colacium; Characiochloris; Hydiranum; Characium ? (or Characiopsis ?) ,
cell body 40 μm long, 11 μm wide,
x 640, Shiba river, near Owada Park, Saitama city, Saitama Pref., Japan, April 3, 2005 by Y. Tsukii
94 μm; x 640
Cell body 72 μm long, 24 μm wide, x 640