Species: Cell body large, 65-94 μm long, 48-67 μm wide, L/W=1.3, isthmus 14-27 μm wide; semicells semielliptical or ovoidal pyramid in shape; cellwall covered with large granules showing crenulated margins, 7 granules present between apical and basal corners; apex flattened with 4 granules (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. ochthodes 72-78 x 55-9 μm L/W=1.3 Univ. A.V.M. Obihiro Hokkaido, 2005

C. ochthodes ? or C. margaritiferum ? 81 x 56 μm L/W=1.5 Aizu Recreation p. Aizuwakamatsu Fukushima, 2005

C. ochthodes ? or C. margaritiferum ? 82 x 55 μm Oyoshi Park Koshigaya Saitama, 2006

Similar species -->> C. margaritiferum (50-60 μm);

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