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 31 μm long, 10 μm wide,
x 640, a small pond near a gymnasium at Yamaguchi university, Yamaguchi city, Yamaguchi Pref., November 21, 2004, by Y. Tsukii
94 μm; x 640