Genus: Unicellular; variable in shape; a constriction at the center of the cell body;
mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal,
rectangular, pyramidal or kidney-shaped; no apical indentation
(Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body large in size, 138-168 μm long, 73-90 μm wide, L/W=2; constriction 39-45 μm wide; semicells half-elliptical or ovoidal; cell wall dotted (Illustrations of the Japanese fresh-water algae, 1977).
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50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Cosmarium maculatum Turner: Cell body large in size, 138-168 μm long, 73-90 μm wide, L/W=2; constriction 39-45 μm wide; semicells half-elliptical or ovoidal; cell wall dotted (Illustrations of the Japanese fresh-water algae, 1977).
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