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: Cell body 16-25 μm long, 8-13 μm wide, thickness 7-12 μm; anterior end slanted, posterior end rounded; longitudinal groove extending to near the posterior end; chloroplasts brownish, with 4, 6-7 pyrenoids; starch granules scattered within the chloroplasts; stigma absent; two refractile bodies at the center of the cell (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

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C. tetrapyrenoidosa ? cell 27-31 μm 5 or more pyrenoids Kawagoe Saitama, 2001

C. tetrapyrenoidosa ? 18 x 9 μm 4 pyrenoids Nishi-Urawa Saitama, 2001

C. tetrapyrenoidosa ? μm Omine-numa Tsukiyono Gunma, 2003

C. tetrapyrenoidosa ? 23 x 11 μm near Yoshino park Mitsukaido Ibaraki, 2006

Similar genus -->> Chroomonas; Chilomonas;

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