Subgenus [Eucosmarium]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [ Cyclidium ]: Cell surface smooth; semicells half circle, half ellipsoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species[ ]: Cell body medium in size, 98-102 μm long, 56-62 μm wide, L/W=1.5, isthmus 20-25 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. pandriforme ? 64 x 41 μm L/W=1.6 Yukawa-numa Nishiwaga Iwate, 2007	C. pandriforme ? 68 x 43 μm 69 x 42 μm Omine-numa Tsukiyono Gunma, 2003	C. pandriforme ? 62 x 40 μm Omine-numa Tsukiyono Gunma, 2003	C. pandriforme ? 63 x 40 μm Omine-numa Tsukiyono Gunma, 2003
C. pandriforme ? 56-71 x 34-42 μm L/W=1.6 Omine-numa Minakami Gunma, 2006	C. pandriforme ? μm L/W= Omine-numa 5 Minakami Gunma, 2007.10	C. pandriforme ? 62 x 40 μm L/W=1.6 Oze-ga-hara Katashina Gunma, 2006	C. pandriforme ? μm L/W= Kareki-numa Nikko Tochigi, 2008
C. pandriforme ? 59 x 37 μm L/W=1.6 Watasuge marsh Tsugaike highland Nagano, 2005	C. pandriforme ? 72 x 43 μm Kashibaru marsh 6 Karatsu Saga, 2006	C. pandriforme ? 72 x 43 μm Kashibaru marsh 5 Karatsu Saga, 2006	C. pandriforme ? μm Kashibaru m.II Karatsu Saga, 2008

Similar species -- >> C. pseudopyramidatum; C. subcucumis;

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