Species: cell body medium in size, slightly shorter than its width, bay closed,
41-43 μm long, (35)-38 μm wide, isthmus (11.5)-14 μm wide;
semicells pyramidal in shape with truncated apex, basal corners rounded, lateral margins slightly convex;
cell wall covered with many granules arranging radially at periphery of the semicells, central region smooth
(Illustrations of The Japanese Fresh-water Algae, 1977).
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31 μm
63 μm
94 μm; x 640
Cosmarium vexatum W. West,
cell body 33 μm long, 30 μm wide, L/W=1.1, isthmus 10 μm wide,
x 640, riverside, Naka-gawa Kahan koen (riverside park at Naka river), Kuroiso city, Tochigi Pref., Japan, January 3, 2005 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
