Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation.
Subgenus [ Eucosmarium ]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [ Cyclidium ]: Cell surface smooth; semicells half circle, half ellipsoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species [ var. circulare ]: Cell body circular or broad elliptical, 53-73 μm long, 48-56 μm wide, isthmus 17-25 μm wide; semicells semicircular.
[ var. ellipticum ]: Cell body elliptical, 50-73 μm long, 42-56 μm wide, isthmus 14-24 μm wide, L/W=1.1-1.3 (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. lundellii var. circulare 76 x 68 μm Ishinazaka Furukawa Miyagi, 2003	C. lundellii var. circulare 65 x 56 μm Water field Kusu Oita, 2008	C. lundellii var. circulare 57 x 48 μm Higashi-sano Hakuba Nagano, 2004	C. lundellii var. circulare μm Nabekura HL Iiyama Nagano, 2008
C. lundellii var. circulare 49 x 42 μm Umi-no-nakamichi Fukuoka, 2001	C. lundellii var. circulare ? or var. ellipticum ? 45 x 33 μm Kayoicho-ike Fukuoka, 2001

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