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 (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

C. meneghinii v. meneghinii 24 x 18 μm Uba-ga-daira Nasu Tochigi, 2006

C. meneghinii v. reinschii 18 x 14 μm Shimo-no-koike Shiga highland Nagano, 2004

C. meneghinii v. reinschii 20 x 17 μm Univ. A.V.M. Obihiro Hokkaido, 2005

C. meneghinii v. reinschii 18 x 15 μm Omine-numa 6 Minakami Gunma, 2007

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