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Chlorophyceae: Chlorococcales: Chlorococcaceae (Characiaceae)

 Characium sp.

Characium 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).
Species:
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
scale 31 μm scale 63 μm scale 94 μm; x 640
Characium Characium
Cell body 72 μm long, 24 μm wide, x 640
Characium Characium

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