Species: Cell body curved in various degree, slightly swells at the center, 90-(117-256)-260 μm long, 14-(19-34)-45 μm wide, L/W=6-8, cell wall smooth, transparent or brownish; chloroplasts with 2-4 laminae; semicells with 4-8 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977). Cell body 140-250 μm long, 28-34 μm wide, L/W=5-8; cell wall smooth; chloroplasts with 5-6 laminae; semicells with 3-4 pyrenoids (Photomicrographs of the Freshwater Algae, vol. 1, 1984).

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C. leibleinii 275 x 35 μm L/W=7.9 Karasu river Takasaki Gunma, 2004	C. leibleinii 250 x 34 μm 245 x 32 μm L/W= Kinchakuda Hidaka Saitama, 2004	C. leibleinii 220 x 34 μm L/W=6.5 Ara river Kumagaya Saitama, 2004	C. leibleinii 260 x μm L/W=8.1 Motono Chiba, 2003
C. leibleinii 200 x 22 μm L/W= Nagaike park Hachioji Tokyo, 2005	C. leibleinii 140 x 19 μm L/W=7.4 Iruma river Sayama Saitama, 2004	C. leibleinii C. dianae ? 138 x 19 μm L/W=7 Japan, 1998	C. leibleinii ? 180 x 34 μm L/W=5.3 Karasu river Takasaki Gunma, 2004
C. leibleinii C. dianae ? 187 x 15 μm L/W=12.5 Kabuto-yama Nishi-no-miya Hyogo, 2004	C. leibleinii 180 x 20 μm L/W=9.0 Kodanuki marsh Fujinomiya Shizuoka, 2006	C. leibleinii 200 x 25 μm L/W=8.0 Ho-daisan p. Yoshikawa Saitama, 2006	C. leibleinii 218 x 25 μm L/W=8.7 Tsuki river Ogawa Saitama, 2007
C. leibleinii 170 x 24 μm L/W=7.1 Ohdo-ike p. Chuo-ku Chiba, 2007

Similar species -->> C. moniliferum; C. dianae;

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