Species [ var. cucurbitinum ]: Cell body medium in size, (56.5-73)-83 μm long, 26-(28-30)-33 μm wide, L/W=2.5, slightly constricted at the center; semicells semi-spindle shaped, gradually attenuated toward apex, lateral margins convex, apex broad circular; cell wall dotted.
[ f. minor ]: Smaller than var. cucurbitinum, 50-(56-60) μm long, 22.5-25-(26.5-28) μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. cucurbitinum: Cell body 26-33 μm long, L/W=2.5
C. cucurbitinum ? 66 x 31 μm Hakkoda Gourd line Hakkoda mountain Aomori, 2005	C. cucurbitinum ? 77 x 31 μm Hachiman-numa m. Hachimantai Iwate, 2007	C. cucurbitinum v. cucurbitinum 66-69 x 27-29 μm L/W=2.4 Omine-numa Minakami Gunma, 2006	C. cucurbitinum ? 66 x 27 μm Omine-numa Tsukiyono Gunma, 2003
C. cucurbitinum v. cucurbitinum 70 x 28 μm L/W= Chigo-ike 4 Shiga highland Nagano, 2006.10	C. cucurbitinum ? 59 x 25.5 μm Hikage marsh Shiga highland Nagano, 2005
f. minor: Cell body 50- μm long
C. cucurbitinum f. minor 45 x 21 μm L/W=2.1 Imou bog Toyohashi Aichi, 2004

Similar species -->> C. cucurbita (laterally straight, apex flattened); C. thwaitesii (apex broadly rounded);

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