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
Subgenus [Eucosmarium]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [Pyramidatae]: Cell surface smooth; semicells pyramidal with flattened apex or trapezoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body small, 8.5-13 μm long, 7-12 μm wide, isthmus 2.8-4.3 μm wide; (Illustrations of the Japanese Fresh-water Algae, 1977).

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Apex flatted, semicell scalariform
C. succisum 14 x 14 μm Toneri Park Tokyo, 2001	C. succisum 13 x 14 μm Tatebayashi Gunma, 2001	C. succisum 14 x 14 μm Sendabori Chiba, 2002	C. succisum 14 x 13 μm Toneri Park Tokyo, 2001
C. succisum 10-13 x 10 μm Kuroiso Tochigi, 2002	C. succisum 11 x 12 μm near Yamaguchi Univ. Yamaguchi, 2004

Similar species -- >> C. norimbergense;

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