Species [ var. venus ]: Cell body small, strongly curved, inner side not convex, both ends pointed, 48-(54-60)-85 μm long, 6-(9)-11 μm wide, L/W=8-9; cell wall smooth, transparent or brownish in color; 1-2 pyrenoids in each chloroplast, one lamina visible.
[ var. incurvum (Brébisson) Krieger ]: Smaller than var. venus, 30-(50-73)-80 μm long, 6-(8.4-11)-14 μm wide, L/W=5-7 (Illustrations of The Japanese Fresh-water Algae, 1977).

C. venus 112 x 12 μm L/W=9.3 Shimo-muneoka Shiki Saitama, 2004	C. venus 100 x 11.5 μm L/W=8.7 Saiko Toda Saitama, 2004	C. venus 100 x 10 μm 96 x 9 μm L/W=10.0, 10.7 water reservoir near Yamaguchi Univ. Yamaguchi, 2004	C. venus 90 x 9 μm L/W=10.0 Ishinazaka Furukawa Miyagi, 2003
C. venus 75 x 8.5 μm L/W=8.8 Maimeno-ike Norikura highland Nagano, 2006	C. venus 78 x 12 μm L/W=6.5 Imou bog Toyohashi Aichi, 2004	C. venus 70 x 9 μm L/W=7.8 Kabuto-yama Nishi-no-miya Hyogo, 2004	C. venus 75 x 10 μm L/W=7.5 Kejo-numa 2 Osaki Miyagi, 2006

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