Genus: Two flagella of equal length inserted close together into an anterior papilla of variable shape usually directed anteriorly; chloroplast form variable; usually 2 contractile vacuoles; cell division producing 2-8 zoospores; sexual reproduction usually isogamous, anisogamy and oogamy known but rare; > 500 species, mostly fresh water (Illustrated Guide, 1985). A large chloroplast; stigma; a single nucleus; two contractile vacuoles anterior (Kudo, 1966).

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Bicocca:
C. bicocca ? μm s: anterior ? Tanohara Natural p. Ontake highland Nagano, 2005	C. inaequalis 22 x 19 μm s: anterior ? Kodai-hasu Gyoda Saitama, 2006

Similar genus -> Chloromonas; Chlorococcum;

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