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 elongated ovoid or elliptical; cytopharynx conspicuous; three rows of ejectisome (trichocysts) (Yamagishi, 1999).
Species:

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C. rostratiformis ? cell 23 μm Nishi-Urawa Saitama, 2001	C. rostratiformis ? cell 23 μm Toneri Park Tokyo, 2001	C. rostratiformis ? cell 16-19 μm Kaga Ishikawa, 2000	C. rostratiformis ? cell μm Iruma Saitama, 2003
C. rostratiformis ? cell 19 μm Kaga Ishikawa, 2000	C. rostratiformis ? stock Ikk-2 cell 20 μm Kaga Ishikawa, 2000	C. rostratiformis ? stock Ikk-2, cysts cell 16-20 μm Kaga Ishikawa, 2000	C. rostratiformis 24 x 10 μm Ranzan Saitama, 2004
C. rostratiformis ? 24 x 10 μm near City Hall Fujimi Saitama, 2004

Similar genus -->> Chroomonas; Chilomonas;

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