Genus: Cell body crescent in shape (long, curved, tapered at both ends); cross section rounded; cell wall smooth or with longitudinal lines, bands on the cell wall in some species; chloroplast laminae ridged and radially arranged, which makes cross section star-shaped; pyrenoids aligned or scattered
Species: Cell body slender, slightly curved to almost straght, (150-)200-400(-480) μm long, (5-)6-9(-12) μm wide, L/W=(20-)30-40(-55) (Coesel & Meesters 2007).

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L/W greater than 30 (around 40)
C. pronum 295 x 7.5 μm 294 x 7 μm L/W=39.3,42 Onnenai Kushiro marsh Hokkaido, 2005	C. pronum 590 x 13 μm L/W=45.4 Onnenai Kushiro marsh Hokkaido, 2005	C. pronum 324 x 8 μm L/W=40.5 Ohyachi 2 Kazuno Akita, 2007
C. pronum 322,352 x 7 μm L/W=46,50 Kenashitai Hakkoda mountain Aomori, 2005	C. pronum 313 x 7 μm L/W=44.7 Kami-Kenashitai 3 Hakkoda mountain Aomori, 2006	C. pronum 280 x 6 μm L/W=46.7 Tashirodaira m. Hakkoda mountain Aomori, 2005	C. pronum or C. acutum ? 138, 320 x μm L/W=46.0 Sensho-ga-hara 11 Shizukuishi Iwate, 2007
C. pronum 124 x 3 μm L/W=41.3 Iroha-numa Zao mountain Yamagata, 2006	C. pronum 248 x 6 μm L/W=41 Mida-ga-hara Gassan (mt) Yamagata, 2006	C. pronum 226,277 x μm L/W=35,40 Yahei-daira 2 Azuma mt. Yamagata, 2007	C. pronum 227 x 6 μm L/W=37.8 Yahei-daira s.3 Azuma mt. Yamagata, 2007
C. pronum 484 x 10 μm L/W=48 Aobano-mori p. Chiba, 2003	C. pronum 275 x 6 μm L/W=45.8 Aquatic botanical g. Sawara Chiba, 2004	C. pronum 153-195 μm L/W=28-41 Sayama Natural p. Higashi-Murayama Tokyo, 2003
C. pronum 155 x 4 μm L/W=38.8 Shimo-no-koike Shiga highland Nagano, 2004	C. pronum 152 x 4 μm L/W=38.0 Shimo-no-koike Shiga highland Nagano, 2005	C. pronum 175 x 5 μm L/W=35 Shijuhachi-ike 2 Shiga highland Nagano, 2006	C. pronum 152 x 4 μm L/W=38.0 Tanohara marsh Shiga highland Nagano, 2006
C. pronum 300 x 6.5 μm 136 x 4 μm L/W=46,34 Karakemi marsh Omachi Nagano, 2006	C. pronum 173 x 4.5 μm L/W=38.4 near Karakemi m Omachi Nagano, 2005	C. pronum 164 x 4.5 μm L/W=36.4 Tanohara Natural p. Ontake highland Nagano, 2005	C. pronum 260 x 7 μm L/W=37.1 Yokotashiro 2 Katashina Gunma, 2007
C. pronum 303,354 x 9 μm L/W=33.6,39.3 Kodanuki marsh Fujinomiya Shizuoka, 2006	C. pronum 265 x 6.5, 271 x 7 L/W=38.7, 40.8 Kabuto-yama Nishi-no-miya Hyogo, 2004	C. pronum 280 μm L/W=40 Kasuga Fukuoka, 2001	C. pronum 416 x 9 μm L/W=46.2 Kashibaru m.3 Karatsu Saga, 2006
C. pronum ? 189 x 5 μm L/W=37.8 Ochiai-numa 2 Noshiro Akita, 2007	C. pronum 146 x 4 μm L/W=36.5 Shibakusadaira Zao mountain Miyagi, 2007	C. pronum 122 x 2.5 μm L/W=48.8 Kannon-numa Shimogo Fukushima, 2005
L/W close to 30; intermediate ?
C. pronum 215-240 x 7 μm L/W=31-34 Midagahara 4 Tate-yama (mt) Toyama, 2006	C. pronum 223 x 6.5 μm L/W=34 Midagahara 5 Tate-yama (mt) Toyama, 2006	C. pronum 235 x 6.5 μm L/W=36 Midagahara 7 Tate-yama (mt) Toyama, 2006	C. pronum 215 x 6.5 μm L/W=33.1 near Karakemi m Omachi Nagano, 2005
C. pronum 99 x 3 μm L/W=33 Kamitashiro Oze-ga-hara Gunma, 2006

Similar species -->> C. idiosporum ( μ, L/W=20-26); C. strigosum (150-410 μ, L/W=10-18); C. aciculare (390-800 μ, L/W=73-135); C. gracile (90-275 μ, L/W=25-40);

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