Species [var. cynthia]: Cell body small, strongly curved, inner side concaved or straight at the centeral region, 73-180 μm long, 11-22 μm wide, L/W=8-10; cell wall brownish in color, finely striated (10-11 striae/10 μm); 3-5 pyrenoids in each semicell;
[var. jenneri]: Cell body small, inner side concaved or straight at the centeral region, 43-(64-98)-110 μm long, 7-(8-11)-18 μm wide, cell wall smooth, transparent or brownish in color
[var. robustum]: Cell body small; 42-80 x 8.8-15 μm; L/W=4-6 (Illustrations of The Japanese Fresh-water Algae, 1977).
[var. curvatisssimum]: Strongly curved, central region nearly straight or slightly concave, tapered toward ends, both ends rounded, 88-137 μm long, 13-19 μm wide, L/W=6.5-9; cell wall lined (about 9 lines/10 μm); 5-6 pyrenoids in each semicell (Photomicrographs of the Freshwater Algae, vol.10, 1989).

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var. curvatisssimum : Central region nearly straight or slightly concave; 88-137 x 13-19 μm; L/W=6.5-9; 5-6 pyrenoids/chl.
v. curvatisssimum 91-132 x 10 μm L/W=9.1-13.2 Omotsubo marsh Tetta-cho Okayama, 2004	v. curvatisssimum 130-160 x 13-14.5 μm L/W=9.6-11.7 Suiren-numa Hakkoda mountain Aomori, 2005	v. curvatisssimum 135 x 14 μm 168 x 13.5 μm L/W=9.6,12.4 Onnenai Kushiro marsh Hokkaido, 2005	v. curvatisssimum 115 x 11 μm 205 x 14 μm L/W=9.6,12.4 Kumakubo Nasu-shiobara Tochigi, 2005
v. curvatisssimum or v. cynthia ? 105x15,150x14 μm L/W=7,10.7 near Karakemi marsh Omachi Nagano, 2005	v. curvatisssimum 110x14,135x12 μm L/W=7.6,10.8 Kowashimizu Suwa Nagano, 2007
v. curvatisssimum 144 x14 μm L/W=10.3 Kodanuki marsh Fujinomiya Shizuoka, 2006	v. curvatisssimum or v. cynthia ? μm L/W= Hazama marsh Ashikaga Tochigi, 2003	v. curvatisssimum or v. cynthia ? 119-162 x 15-16 μm L/W=10.1 Hazama marsh Ashikaga Tochigi, 2006
var. cynthia : Cell body small, finely striated; 73-180 x 11-22 μm; L/W=8-10;
v. cynthia or v. curvatisssimum ? 179 x 16 μm L/W=11.2 Kumakubo Nasu-shiobara Tochigi, 2005	v. cynthia ? or C. leibleinii ? 160 x 19 μm L/W=8.4 riverside park Kuroiso Tochigi, 2005	v. cynthia 125 x 15 μm L/W=8.3 ???? ???? ????, 2005	v. cynthia 117 x 14 μm L/W=8.4 Ikenokochi marsh Tsuruga Fukui, 2004
v. cynthia 117 x 14 μm L/W=9.7 Ohnuma Nasu-shiobara Tochigi, 2006	v. cynthia 105 x 9 μm L/W=11.7 Kamitashiro Oze-ga-hara Gunma, 2006	v. cynthia 90,100 x 9 μm L/W=10,11 Kashibaru m.6 Karatsu Saga, 2006	v. cynthia μm L/W= n. Yamakado m. Nishi-Azai Shiga, 2008
v. cynthia 105 x 13.5 μm Kareki-numa m Nikko Tochigi, 2008	v. cynthia 97 x 12 μm L/W=8.1 Maimeno-ike Norikura highland Nagano, 2006	v. cynthia 72, 78 x 10 μm L/W=7.8 Koigakubo marsh Tessei-cho Okayama, 2004
var. jenneri : Cell body small; 43-110 x 7-18 μm; L/W=8-10
v. jenneri 80-83 x 10 μm near Omine-numa Minakami Gunma, 2006	v. jenneri μm near Omine-numa Minakami Gunma, 2007	v. jenneri 77-80 x 9-10 μm Omine-numa Tsukiyono Gunma, 2003
v. jenneri 75, 105 μm Ko-numa Minakami Gunma, 2008	v. jenneri 80 x 10 μm Koigakubo marsh Tessei-cho Okayama, 2004	v. jenneri 87 x 10 μm Omotsubo m.2 Niimi Okayama, 2006	v. jenneri 67 x 8 μm L/W=8.4 Japan, 199?
var. robustum : Cell body small; 42-80 x 8.8-15 μm; L/W=4-6

Similar species --->> C. venus;

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