Species:
Cell body not curved, spindle or boat in shape;
24-(35-84)-93 μm long,
8-(11-20)-22 μm wide;
L/W = 3-4; a single chloroplast and 1 or 2 pyrenoids in each semicell
(Illustrations of The Japanese Fresh-water Algae, 1977).
Closterium navicula (Brébisson) Lütkemüller,
cell body 58 μm long, 13 μm wide, L/W=4.5,
x 640, a small pond at Kowashimizu, Suwa city, Nagano Pref., Japan, July 16, 2007 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
a small pond at Kowashimizu, Suwa city, Nagano Pref., Japan, July 16, 2007 by Y. Tsukii