Order & Family: Floating unicells or a colony embedded in a matrix; no differentiation of apical and base structures; only one family.
Genus: Unicells or a colony of spherical cells covered with a distinct sheath (Illustrations of The Japanese Fresh-water Algae, 1977).

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Unicells or colonies of 2, 4, 8 cells
C. turgidus 40 samples 9-31 x 9-35 μm 1998-2008	C. turgidus 40 samples 9-31 x 9-35 μm 1998-2008	C. turgidus 40 samples 9-31 x 9-35 μm 1998-2008	C. turgidus 40 samples 9-31 x 9-35 μm 1998-2008
C. minutus ? 7 x 4 μm Inari Park Toyama Toyama, 2002	C. minutus ? 5 μm Showa-machi g.p. Showa town Saitama, 2006	C. minor ? 5 x 4 μm Musashi-Urawa Saitama, 2001
Colonies consisting of many cells
C. pallidus 14 samples 7-11 μm 2003-2007	C. pallidus 14 samples 7-11 μm 2003-2007	C. pallidus 14 samples 7-11 μm 2003-2007	C. pallidus 14 samples 7-11 μm 2003-2007
C. pallidus ? 7 μm Omine-numa Tsukiyono Gunma, 2003	C. pallidus ? or Microcystis ? 11 x 10 μm Kodanuki marsh Fujinomiya Shizuoka, 2005	C. pallidus ? or Microcystis ? 10 μm Fujimi-hotaru-shinsui Okegawa Saitama, 2006	C. limneticus 3 samples 7 μm 2005-2007
C. bituminosus ? or C. varius 1.5 x 2 μm Uruguay, 1999	C. bituminosus ? or C. varius 1.5 x 2 μm Saitama, 1999

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