Species: Cell body 100-(193-310) μm long, 11-22 μm wide, L/W=9-17; inner side nearly straight, both termini broadly blunted; cell wall smooth, transparent or yellowish in color, bands present; chloroplasts with 4-6 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).
160-280 μm long, 10-20 μm wide, L/W=18-19; slightly curved, gradually attenuated toward both ends with obliquely truncated edges; chloroplasts with 4-9 pyrenoids (Photomicrographs of the Freshwater Algae, vol.1, 1984).

C. abruptum 227 x 18 μm L/W=12.6 Kenashitai Hakkoda mountain Aomori, 2005	C. abruptum 237 x 17 μm 235 x 11.5 μm L/W=13.9, 20.4 Kenashitai Hakkoda mountain Aomori, 2006	C. abruptum 177 x 19 μm L/W=9.3 Tashirodaira m.6 Hakkoda mountain Aomori, 2006	C. abruptum 235 x 20 μm L/W=11.8 Ohyachi 2 Hachimantai Akita, 2007
C. abruptum μm L/W= Kuroyachi marsh Hachimantai Iwate, 2007	C. abruptum μm L/W= Hachiman-numa m2 Hachimantai Iwate, 2007	C. abruptum 195 x 19 μm L/W=10.3 Sensho-ga-hara Shizukuishi Iwate, 2007	C. abruptum 213 x 19.5 μm L/W=10.9 Yukawa-numa Nishiwaga Iwate, 2007
C. abruptum 182 x 16 μm L/W=11.3 Mida-ga-hara Gassan (mt) Yamagata, 2006	C. abruptum 168 x 17 μm L/W=9.9 Yahei-daira 3 Azuma mountain Yamagata, 2007	C. abruptum 183 x 17.5 μm L/W=10.5 Iroha-numa Azuma mountain Yamagata, 2007
C. abruptum 360 x 17.5 μm L/W=11-15 Jodo-daira Azuma mountain Fukushima, 2006	C. abruptum 232 x 16.5 μm L/W=14.1 Jodo-daira Azuma mountain Fukushima, 2006	C. abruptum 263 x 21 μm L/W=12.5 Mizunashi-Yachi Komado marsh Fukushima, 2007	C. abruptum μm L/W= Miyatoko m.5 Minami-Aizu Fukushima, 2008
C. abruptum μm L/W= Miyatoko m.3 Minami-Aizu Fukushima, 2008
C. abruptum 155 x 12 μm L/W=12.9 Numappara marsh Kuroiso Tochigi, 2003	C. abruptum ? or C. lineatum ? 175 x 14 μm L/W=12.5 Ohnuma Nasu-shiobara Tochigi, 2006	C. abruptum ? μm L/W= Numappara m.3 Nasu-shiobara Tochigi, 2007	C. abruptum ? μm L/W= Numappara m.2 Nasu-shiobara Tochigi, 2007
C. abruptum 230, 260 μm L/W=11-15 Oze-ga-hara Katashina Gunma, 2006	C. abruptum 213 x 24 μm L/W=8.9 Oze-s.k.m. Katashina Gunma, 2006	C. abruptum 210 x 16 μm L/W=13.1 Midagahara Tateyama Toyama, 2006
C. abruptum 157-215 x 16-18 μm L/W=9.2-12.6 Watasuge marsh Tsugaike highland Nagano, 2006	C. abruptum 203 x 16 μm L/W=12.7 Kamino-tanbo Tsugaike highland Nagano, 2006	C. abruptum ? or C. lineatum ? 240 x 15 μm L/W=16 Karakemi marsh Omachi Nagano, 2006	C. abruptum 213 x 17.5 μm L/W=12.2 Karakemi marsh Omachi Nagano, 2007
C. abruptum 258 x 16 μm L/W=16.1 Shibu-ike Shiga highland Nagano, 2005	C. abruptum 235 x 16 μm L/W=14.7 Shimo-no-koike Shiga highland Nagano, 2004	C. abruptum 187 x 16 μm L/W=11.7 Shimo-no-koike Shiga highland Nagano, 2004	C. abruptum 273 x 18 μm 215 x 16 μm Tanohara marsh Shiga highland Nagano, 2006
C. abruptum 250 x 17 μm Shijuhachi-ike 3 Shiga highland Nagano, 2006	C. abruptum 210 x 16 μm L/W=13.1 Ushidome-ike Norikura highland Nagano, 2005	C. abruptum 295 x 16 μm L/W= Ushidome-ike Norikura highland Nagano, 2006	C. abruptum 220 x 21 μm L/W=10.5 Omotsubo marsh Tetta-cho Okayama, 2004
C. abruptum 249 x 20 μm L/W=12.5 Yamamuro marsh Maibara Shiga, 2008

Similar species -->> C. lineatum (striated, 300-768 μm long); C. intermedium (striated); C. rostratum;

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