Species [ var. dianae ]: Cell body slightly curved, tapered toward both ends, truncated with slanted edges, small pores present at outside of both termini, inner side at center slightly convex, 150-380 μm long, 15-40 μm wide, L/W = 10-12; cell wall smooth; chloroplasts with 5-8 pyrenoids in each chloroplast (Illustrations of The Japanese Fresh-water Algae, 1977).
Cell body 160-323 μm long, 20-28 μm wide, L/W=8.3-12; chloroplasts with about 6 laminae; semicells with 4-8 pyrenoids (Photomicrographs of the Freshwater Algae, vol. 6, 1987).

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var. dianae (?) : L/W less than 10
v. dianae 190 x 24 μm 170 x 21 μm L/W=8.1-10.0 Igashira park Mooka Tochigi, 2004	v. dianae 160 x 17 μm L/W=9.4 Kuroiso Park Kuroiso Tochigi, 2003	v. dianae 155 x 17 μm L/W=9.1 Lake Shirakaba Tateshina & Chino Nagano, 2005	v. dianae or C. tumidulum ? 130 x 16 μm L/W=8.4 Saitama, 2001
v. dianae 190 x 24 μm L/W=7.9 Iruma river Kawagoe Saitama, 2004	v. dianae 152 x 20 μm L/W=7.6 Koigakubo marsh Tessei-cho Okayama, 2004	v. dianae ? 150 x 20 μm L/W=7.5 Imori pond Myoko highland Niigata, 2004	v. dianae ? 145, 170, 178 μm L/W=7.3 Minuma-tanbo Urawa Saitama, 2001
v. dianae 160 x 17 μm L/W=9.4 Lake Tanuki Fujinomiya Shizuoka, 2006	v. dianae 148 x 16 μm L/W=9.3 near Omine mt. Minakami Gunma, 2006

Similar species -->> C. venus ( < 85 μm ); C. calosporum; C. parvulum; C. leibleinii; C. moniliferum;

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