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 [Cristatae]: Cell surface granulated, gnarled or spiny; semicells half circle, half ellipsoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Cell body (64-82)-79 μm long, 53-64.5 μm wide, L/W=1.20-1.25, isthmus 19-(19.6-25.8) μm wide; semicells covered with radially-arranged granules; frontal view half-circular, lateral view ovoid-circular, apical view ellipsoidal (Illustrations of the Japanese Fresh-water Algae, 1977).

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C. intermedium ? or C. margaritiferum ? or C. botrytis ? 65 x 52 μm Kayoicho-ike Fukuoka, 2001	C. intermedium ? or C. margaritiferum ? 60 x 47 μm Kayoicho-ike Fukuoka, 2001	C. intermedium ? or C. margaritiferum ? 52 x 43 μm Kawagoe Saitama, 2001	C. intermedium ? 52 x 42 μm Sai-ko Saitama, 2001
C. intermedium or C. margaritiferum ? 56 x 44 μm Chiba-Minato p. Chiba, 2003	C. intermedium or C. margaritiferum ? 55 x 45 μm Tsurugashima Chiba, 2003

Similar species -->> C. margaritiferum; C. botrytis; C. logiense; C. pachydermum;

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