Species: Cell body medium in size, slightly curved, centrally straight, gradually tapered toward ends,
both ends truncated with rounded corners, 163-(190-350) μm long, 8-(8.4-13)-20 μm wide,
L/W = 25-32; cell wall smooth, bands absent; chloroplasts with 5-7 pyrenoids
(Illustrations of The Japanese Fresh-water Algae, 1977).
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C. toxon W. West: Cell body slightly curved, 163-(190-350) μm long, 8-(8.4-13)-20 μm wide, L/W = 25-33; both termini broadly rounded (nearly truncated); cell wall transparent, smooth; 5-7 pyrenoids arranged in a single line (Illustrations of The Japanese Fresh-water Algae, 1977).