Species [var. lunula] : Cell body large, 250-(430-552)-1000 μm long, 47-(73-89)-120 μm wide, L/W=5-8; inner-side nearly straight, outer-side convex; tapered at both termini (broad circle, slightly inversed); cell wall smooth, transparent, without bands; chloroplasts with many pyrenoids.
[var. biconvexum Schmidle]: Inner-side also convex; 455-603 μm long, 85-126 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. lunula: Inner-side straight, 250-1000 μm long, 47-120 μm wide
var. lunula 486-502 x 82-89 μm L/W=5.7-5.9 Onnenai Kushiro marsh Hokkaido, 2005	var. lunula 490 x 91 μm L/W=5.4 Tashirodaira m. Hakkoda mountain Aomori, 2005	var. lunula 600 x 88 μm L/W=6.8 Imori pond Myoko highland Niigata, 2004	var. lunula 530 x 80 μm L/W=6.6 Nozomiko 2 Myoko highland Nagano, 2007
var. lunula 540 x 74 μm L/W=7.3 Kaga Ishikawa, 2000	var. lunula 840 x 119 μm L/W=7.9 Kabuto-yama Nishi-no-miya Hyogo, 2004	var. lunula 680 x 85 μm L/W= 8.0 USA, 1999	var. lunula μm L/W= pond near R272 Minakami Gunma, 2008
var. lunula μm L/W= Chojabaru Kokonoe Oita, 2008	var. lunula μm L/W= Motoyu marsh Nikko Tochigi, 2008
var. biconvexum: Inner-side covex, 455-603 μm long, 85-126 μm wide
var. biconvexum 660 x 106 μm L/W=6.2 Mizunashi-Yachi Komado marsh Fukushima, 2007	var. biconvexum 825 x 118 μm L/W=7.0 Nasu-shiobara Tochigi, 1998 Movies	var. biconvexum μm Numappara m.1 Nasu-shiobara Tochigi, 2007	var. biconvexum 434 x 87 μm L/W=5.0 Ikei-no-ike Nasu Tochigi, 2006
var. biconvexum 584 x 82 μm L/W=7.1 Igashira park Mooka Tochigi, 2006	var. biconvexum 874 x 119 μm L/W=7.3 Japan, 1998	var. biconvexum 610 x 90 μm L/W=6.8 Azami-ike Norikura highland Nagano, 2006	var. biconvexum μm L/W= Ko-numa Minakami Gunma, 2008
var. biconvexum 470 x 94 μm L/W=5.0 Kodanuki marsh Fujinomiya Shizuoka, 2006	var. biconvexum 825 x 113 μm L/W=7.3 Hiroshima, 1998 Movies	var. biconvexum 300 x 50 μm 460 x 78 μm L/W=5.9-6.0 USA, 1999
var. lunula ? 492 x 88 μm L/W=5.6 Iyari marsh 2 Omachi Nagano, 2008

Similar species -->> C. ehrenbergii;

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