Family: Body truncate anteriorly; two anterior flagella; an oblique furrow near anterior region.
Genus: Elliptical body with a firm pellicle; dorsal side convex, ventral side slightly flat; "cytopharynx" with granules; two lateral chromatophores (chloroplasts) vary in color from green to blue-green, brown or rarely red; 1-3 contractile vacuoles anterior (Kudo, 1966). Cell body cylindrical or elongated ovoid; cytopharynx inconspicuous, two rows of ejectisomes (formerly trichocysts) (Yamagishi, 1999).

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Chroomonas sp. 19.5 x 10 μm Kurobane Tochigi, 2001	Chroomonas sp. 20 μm Kurobane Tochigi, 2001	Chroomonas sp. 16 x 11 μm Japan, 1999	Chroomonas sp. ? 11-15 x 7-9 μm Japan, 1998
Chroomonas sp. ? 19 x 9 μm Nishi-Urawa Saitama, 2001	Chroomonas sp. ? 14 x 7 μm Sanda Hyogo, 2001	Chroomonas sp. 22 x 11 μm Ageo Maruyama Park Saitama, 2002	Chroomonas sp. 17 x 8 μm 22 x 10 μm Akigase Park Saitama, 2002
Chroomonas sp. ? μm Otto-Numa Tsuchiura Ibaraki, 2002	Chroomonas sp. ? μm Daidarabotchi-ike Iizuna-kogen Nagano, 2003	Chroomonas sp. ? μm Mizuko Fujimi Saitama, 2003	Chroomonas sp. ? 21 x 11 μm Iruma river Sayama Saitama, 2004
Chroomonas sp. 16 x 7.5 μm Sano Hakuba Nagano, 2004	Chroomonas sp. 17 x 8 μm Yanome-dam p. Nasu Tochigi, 2004	Chroomonas sp. 19 x 10 μm Komado marsh Showa & Tajima Fukushima, 2004	Chroomonas sp. 19 x 10 μm Ikenokochi marsh Tsuruga Fukui, 2004

Similar genus -->> Cryptomonas; Chilomonas;

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