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 (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

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C. nematodes v. proboscideum ? 400 x 34 μm Onnenai Kushiro marsh Hokkaido, 2005	C. nematodes v. proboscideum ? μm Hanadate SWL Yuri-Honjo Akita, 2008	C. nematodes v. proboscideum ? 340 x 30 μm 320 x 29 μm Komado marsh Showa and Tajima Fukushima, 2004	C. nematodes or C. archerianum ? 262 x 26 μm Oze-ga-hara Katashina Gunma, 2006
C. nematodes 370 x 29 μm Karakemi marsh Omachi Nagano, 2006	C. nematodes 370 x 32 μm Kashibaru m.5 Karatsu Saga, 2006	C. nematodes 334 x 29 μm Kareki-numa m. Nikko Tochigi, 2008

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