Species [ var. diplosporum ]: Cell body medium in size, cylindrical, slightly constricted at center, 52-66 μm long, 23-33 μm wide, L/W=2.0; semicells slightly-ellipsoidal cylindroid, apex broadly rounded; cell wall finely dotted, chloroplasts consisting of longitudinal axis and radially-arranged laminae.
[ var. major ]: Larger than var. diplosporum, (98)-102-115 μm long, 43-47 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. diplosporum 45 x 25 μm L/W=1.8 Kinchakuda Hidaka Saitama, 2004	C. diplosporum 43 x 24 μm 47 x 26 μm L/W=1.8 Kurome river Asaka Saitama, 2004	C. diplosporum 46 x 27 μm L/W=1.7 Omatazawa ? Nishiwaga Iwate, 2007
C. diplosporum ? or C. thwaitesii ? 31 x 19 μm L/W=1.6 Omine-numa Tsukiyono Gunma, 2003	C. diplosporum ? or C. thwaitesii ? 32 x 21 μm L/W=1.5 Tanohara marsh Shiga highland Nagano, 2004	C. diplosporum ? 33 x 16 μm L/W=2.1 Koyoen-megamiyama Nishi-no-miya Hyogo, 2004

Similar species -- >> C. globosum (L/W=1.5);

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