Species: Cell body medium in size, slightly curved, central region spindle-shaped (cf. C. striolatum), both sides convex, both termini slightly swelled, with slanted edges (cf. C. ralfsii), 190-(320-400)-530 μm long, 18-(29-33) μm wide, L/W=11-16; cell wall striated (10 lines within 10 μm), brownish in color; chloroplasts with 3 laminae, 3-5 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. rostratum 280 x 26 μm L/W=10.8 Shimo-Kenashitai 1 Hakkoda mt. Aomori, 2006	C. rostratum 325 x 29 μm L/W=11.2 Shimo-Kenashitai 2 Hakkoda mt. Aomori, 2006	C. rostratum 250-280 x 25,26 μm L/W=9.6-11.2 Sukawa highland Kurikoma mountain Akita, 2005	C. rostratum 250 x 25 μm L/W=10.0 Sukawa highland Kurikoma m. Akita, 2007
C. rostratum 210 x 25 μm L/W=8.4 Sensho-ga-hara Shizukuishi Iwate, 2007	C. rostratum 300 x 28 μm L/W=10.7 Yukawa-numa Nishiwaga Iwate, 2007	C. rostratum μm L/W= Hachimantai mt. Hachimantai Iwate, 2007	C. rostratum μm L/W= Mitsuishi marsh Hachimantai Iwate, 2008
C. rostratum 322,290 x 26,28 μm L/W=12.4,10.4 Iroha-numa Zao mountain Yamagata, 2006	C. rostratum μm L/W= Iroha-numa 1 Zao mountain Yamagata, 2008	C. rostratum μm L/W= Shibakusadaira Zao mountain Yamagata, 2007
C. rostratum 280 x 36 μm L/W=10.6 Komado marsh Showa and Tajima Fukushima, 2007	C. rostratum 260 x 24 μm L/W=10.6 Oze-ga-hara Katashina Gunma, 2006	C. rostratum 252 x 27 μm L/W=9.3 Uba-ga-daira Nasu Tochigi, 2006	C. rostratum μm L/W= Hyoutan-ike Nasu Tochigi, 2007
C. rostratum 250 x 23 μm L/W=10.9 Kamino-tanbo Tsugaike highland Nagano, 2006	C. rostratum μm L/W= Iyari marsh 1 Omachi Nagano, 2008	C. rostratum 250 x 25 μm L/W=10.0 Shijuhachi-ike Shiga highland Nagano, 2005
C. rostratum 255 x 24 μm L/W=10.6 Shijuhachi-ike Shiga highland Nagano, 2007	C. rostratum μm L/W= Shijuhachi-ike 1 Shiga highland Nagano, 2008	C. rostratum 237 x 26 μm L/W=9.1 Shimo-no-koike Shiga highland Nagano, 2004	C. rostratum 290 x 26 μm L/W=11.2 Shimo-no-koike Shiga highland Nagano, 2006
C. rostratum 230 x 25 μm 255 x 24 μm L/W=9.2, 10.6 Shibu-ike Shiga highland Nagano, 2005	C. rostratum 250 x 25 μm L/W=10.0 Hyoutan-ike Shiga highland Nagano, 2005
C. rostratum 330 x 28 μm 343 x 29 μm L/W=11.8 Ushidome-ike Norikura highland Nagano, 2005	C. rostratum 310,360 x 27,29 μm L/W=11.5 Ushidome-ike Norikura highland Nagano, 2006	C. rostratum 275 x 25 μm L/W=11.0 Ushidome-ike Norikura highland Nagano, 2006	C. rostratum μm L/W= Ushidome-ike Norikura highland Nagano, 2007
C. rostratum 305 x 26 μm L/W=11.7 Tanohara Natural p. Ontake highland Nagano, 2005	C. rostratum 250 x 25 μm L/W=10 Kodanuki marsh Fujinomiya Shizuoka, 2006
C. rostratum 300 x 27 μm L/W=11.1 Imou bog Toyohashi Aichi, 2004	C. rostratum 270,290 μm L/W=9.6,10.7 Imou bog Toyohashi Aichi, 2004	C. rostratum μm L/W= Kashibaru m.2-2 Karatsu Saga, 2008
Both ends slightly swelled
C. rostratum 245 x 24 μm L/W=10.2 Kodanuki marsh Fujinomiya Shizuoka, 2005	C. rostratum 200 x 25 μm L/W=8.0 Midagahara 3 Tateyama Toyama, 2006	C. rostratum 180 x 23 μm L/W=7.8 Midagahara 5 Tateyama Toyama, 2006
Close to C. nematodes
C. rostratum 270 x 25 μm L/W=10.8 Omotsubo marsh Niimi Okayama, 2006	C. rostratum or C. nematodes ? μm Miyatoko m.3 Minami-Aizu Fukushima, 2008	C. rostratum or C. nematodes ? μm Yamamuro m.1 Maibara Shiga, 2008	C. rostratum ? 300 x 25 μm L/W=12.0 Nozomiko 2 Iiyama Nagano, 2007
Other species ?
C. rostratum or C. lanceolatum ? 209 x 26 μm with bands Uruguay, 1999	C. rostratum or C. ralfsii ? 330 x 30 μm L/W=11 USA, 1999	C. rostratum ? 360 x 24 μm L/W=15 Imori pond Myoko highland Niigata, 2004
C. rostratum ? 530 x 50 μm L/W=10.6 Komado marsh Showa and Tajima Fukushima, 2004	C. rostratum ?? 460 x 50 μm L/W=9.2 Igashira park Mooka Tochigi, 2006	C. rostratum or C. macilentum ? 572 x 44 μm L/W=13 Onnenai Kushiro marsh Hokkaido, 2005	C. rostratum ? or C. macilentum ? 470 x 22 μm L/W=21 USA, 1999

Similar species -- >> C. nematodes; C. striolatum; C. archerianum; C. intermedium; C. ralfsii;

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