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: 390-(430-580)-800 μm long, 4-(5-7)-8 μm wide, L/W = 73-135; cell body very long, slightly curved, tapered at both termini; cell wall transparent, lack bands (Illustrations of The Japanese Fresh-water Algae, 1977).

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Cell body curved
C. aciculare 380 x 6 μm L/W=63 Arakawa-Saiko p. Minami-ku Saitama, 2007	C. aciculare 375-520 μm L/W=61-74 Akigase Park Saitama, 2002	C. aciculare ? 252 x 4 μm L/W=63 water reservoir near Yamaguchi Univ. Yamaguchi, 2004	C. aciculare ? 213 μm L/W=61 Kayoicho-ike Fukuoka, 2001
C. aciculare 195 x 3 μm L/W=65 picnic-no-mori Akigase Park Saitama, 2005	C. aciculare 142 x 2 μm L/W=71 Omine-numa Tsukiyono Gunma, 2003
C. aciculare ? 219 μm L/W=58 Higashi-hiroshima Hiroshima, 1998 Movies	C. aciculare ? 206 μm L/W=54 Tochigi, 1998	C. aciculare ? 138 x 2.5 μm L/W=55.2 Omine-numa Tsukiyono Gunma, 2003	C. aciculare ? 125 x 2.5 μm L/W=50 Kannon-numa Shimogo Fukushima, 2005
C. aciculare ? or C. gracile ? 150 x 3 μm L/W=50 Daidarabotchi-ike Iizuna-kogen Nagano, 2003	C. aciculare or C. gracile ? 275 μm L/W=46 Japan, 199?	C. aciculare ? or C. gracile 150-194 μm L/W=38-48 Japan, 1998

Similar species -->> C. gracile;

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