Species: [ var. parvulum ]: Cell body curved, not swelled at the center (inner side straight or slightly concaved), tapered toward both thorn-like or slightly rounded ends (cf. C. calosporum), a small pore present on its outer side, 60-160 μm long, (8.5-15)-17 μm wide, L/W=7-10; cell wall smooth, transparent; chloroplasts with fewer laminae (only two visible); 3-5 pyrenoids in each chloroplast.
[ var. angustum ]: Elongate and thinner than var. parvulum, 75-(98-141) μm long, 5-(8.5-11) μm wide, L/W=11-15; curvature variable (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. parvulum v. angustum 120 x 10.5 μm L/W=11.4 Koga general park Koga Ibaraki, 2003	C. parvulum v. angustum 130 x 10 μm L/W=13.0 Koigakubo marsh Tessei-cho Okayama, 2004	C. parvulum cell μm Higashi-hiroshima Hiroshima, 1998	C. parvulum cell μm Higashi-hiroshima Hiroshima, 1998
C. parvulum v. angustum 140 x 12 μm L/W=11.7 Iyari marsh Omachi Nagano, 2006	C. parvulum v. angustum 156 x 13 μm L/W=12.0 Oh-numa marsh Kakunodate Akita, 2007

Similar species -- >> C. calosporum; C. venus ( < 85 μm ); C. dianae ( > 150 μm );

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