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. angustatum 380 x 24 μm L/W=15.8 Ko-numa Tsukiyono Gunma, 2003	C. angustatum 374 x 24 μm L/W=15.6 Ko-numa Tsukiyono Gunma, 2003	C. angustatum 600? x 23 μm L/W=26.1 Ko-numa Tsukiyono Gunma, 2007	C. angustatum μm L/W= Ko-numa 1 Tsukiyono Gunma, 2008
C. angustatum μm L/W= Ko-numa 3 Tsukiyono Gunma, 2008	C. angustatum 470 x 22 μm L/W=21.4 near Omine mt. Tsukiyono Gunma, 2006	C. angustatum μm L/W= near Omine mt. Tsukiyono Gunma, 2007	C. angustatum μm L/W= a pond near R272 Minakami Gunma, 2008
C. angustatum 420 x 25 μm L/W=16.8 Nozomiko 2 Iiyama Nagano, 2007

Similar species -->> C. ulna; C. toxon (cell wall smooth); C. praelongum;

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