Species: Cell body not curved, spindle or boat in shape; 24-(35-84)-93 μm long, 8-(11-20)-22 μm wide; L/W = 3-4; a single chloroplast and 1 or 2 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. navicula 35 x 10 μm L/W=3.5 near Omine-numa Minakami Gunma, 2006	C. navicula 49 x 13 μm L/W=3.8 near Omine-numa Minakami Gunma, 2007	C. navicula 33 x 11 μm L/W=3.0 Ohnuma enchi Nasu-shiobara Tochigi, 2006	C. navicula 47-56 x 14 μm L/W=3.4-4.0 Numa-no-hara m. Madarao highland Niigata, 2005
C. navicula 56 x 15 μm L/W=3.7 Forest botanical g. Togakushi highland Nagano, 2006	C. navicula 55 x 13 μm L/W=4.2 Tane-ike Togakushi highland Nagano, 2006	C. navicula 58 x 13 μm L/W=4.5 Suwa Togakushi highland Nagano, 2007	C. navicula or C. libellula ? 88 x 17 μm L/W=5.2 Omine-numa Tsukiyono Gunma, 2003

Similar species -->> C. libellula;

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