Species: Cell body quickly attenuated toward both ends (cf. C. ralfsii), each extended part shorter than spindle-shaped part at middle (cf. C. setaceum), both termini slighlty curved, rounded, 270-690 μm long, 14-27 μm wide ( L/W= 18-20); cell wall transparent or brownish with thin lines (8-10 lines/10 μm wide); chloroplasts composed of 5 lamellae; 4-6 pyrenoids in each half-cell (Illustrations of The Japanese Fresh-water Algae, 1977).
270-512 μm long, 13-22 μm wide ( L/W= 18-30); 8-11 lines/10 μm wide (Photomicrographs of the Fresh-water Algae, vol. 4, 1985).

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C. kuetzingii 550 x 20,23 μm L/W=27.5 Onnenai Kushiro marsh Hokkaido, 2005	C. kuetzingii 490-536 x 23-24 μm L/W=20-23 Onnenai Kushiro marsh Hokkaido, 2005	C. kuetzingii 454 x 18 μm L/W=25.2 Onnenai Kushiro marsh Hokkaido, 2005
C. kuetzingii 245,250 x 15,16 μm L/W=16.3,16.7 Suiren-numa Hakkoda mountain Aomori, 2005	C. kuetzingii 265 x 16.5, 17 μm L/W=16.1 Suiren-numa Hakkoda mountain Aomori, 2006	C. kuetzingii 228 x 15 μm L/W=15.3 Sukawa highland Kurikoma mountain Akita, 2005	C. kuetzingii 235,295 x μm L/W=15.7,19.3 Sukawa highland Kurikoma mountain Akita, 2005
C. kuetzingii 348 x 20 μm L/W=17.4 Futayo-no-ike Haguro mountain Yamagata, 2005
C. kuetzingii ? or C. ralfsii ? 185 x 15 μm L/W=12.3 Komado marsh Showa & Tajima Fukushima, 2004	C. kuetzingii 235 x 14 μm 235 x 13 μm L/W=16.8, 18.1 Komado marsh Showa and Tajima Fukushima, 2004	C. kuetzingii 245 x 14 μm L/W=17.5 Komado marsh Showa and Tajima Fukushima, 2004	C. kuetzingii 320 x 16 μm L/W=20.0 Komado marsh Showa and Tajima Fukushima, 2007
C. kuetzingii μm L/W= Aizu Recreation p. Aizuwakamatsu Fukushima, 2008	C. kuetzingii 292 x 15.5 μm L/W=18.8 Yoshigadaira m. Shirane mountain Gunma, 2005	C. kuetzingii μm L/W= Kashiwa v.m.p. Kashiwa Chiba, 2008
C. kuetzingii or C. ralfsii ? 420,444 x μm L/W=13 Numa-no-hara marsh Madarao highland Niigata, 2005	C. kuetzingii 303,340,560 x μm L/W=21,24 Numa-no-hara marsh Madarao highland Niigata, 2005	C. kuetzingii 242 x 16 μm L/W=15.1 Numa-no-hara marsh Madarao highland Niigata, 2006	C. kuetzingii 430 x 22 μm 460 x 22 μm L/W=19.5, 20.9 Imori pond Myoko highland Niigata, 2004
C. kuetzingii 310-440 x μm L/W=15-20 Iyari marsh 1 Omachi Nagano, 2007	C. kuetzingii μm L/W= Azami-ike 3 Norikura highland Nagano, 2007.11	C. kuetzingii μm L/W= Shijuhachi-ike 1 Shiga highland Nagano, 2008
C. kuetzingii 216 x 15 μm 232 x 15 μm L/W=14.4, 15.5 Imou bog Toyohashi Aichi, 2004	C. kuetzingii 222 x 16 μm L/W= Imou bog Toyohashi Aichi, 2006
C. kuetzingii μm Yamamuro m.2 Maibara Shiga, 2008	C. kuetzingii μm Yamamuro m.1 Maibara Shiga, 2008	C. kuetzingii μm Yamamuro m.8 Maibara Shiga, 2008	C. kuetzingii or C. subulatum ? 360 x 15 μm Kareki-numa Nikko Tochigi, 2008
C. kuetzingii 250-275 x 13 μm L/W=19.2-21.2 Omotsubo marsh Tetta-cho Okayama, 2004	C. kuetzingii 270 x 17 μm 160 x 13 μm L/W=12.5,15.9 Koigakubo marsh Tessei-cho Okayama, 2004	C. kuetzingii 214 x 14 μm L/W=15.3 Omotsubo marsh Tetta-cho Okayama, 2004	C. kuetzingii 200 x 15 μm 205 x 14 μm L/W=13.3, 14.6 Koigakubo marsh Tessei-cho Okayama, 2004
C. kuetzingii 250 x 16 μm L/W=15.6 Kashibaru marsh 3 Karatsu Saga, 2006	C. kuetzingii 270 x 15.5 μm L/W= Kashibaru marsh 4 Karatsu Saga, 2006	C. kuetzingii μm L/W= Kashibaru m.2-2 Karatsu Saga, 2008	C. kuetzingii 300 x 16 μm L/W=19 Uruguay, 1999

Similar species -->> C. setaceum; C. ralfsii;

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