Family: Body truncate anteriorly; two anterior flagella; an oblique furrow near anterior region.
Genus: Similar to Cryptomonas in general body form and structure, but colorless; without pyrenoid; "cytopharynx" (gullet) deep, lower half surrounded by granules (ejectisome/trichocyst); one contractile vacuole anterior (Kudo, 1966).

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Posterior straight
Chilomonas sp. x 1000, 36 μm Taiwan, 1999	C. paramecium x 400, 27-31 μm Japan, 1997	C. paramecium cell division Japan, 199?	C. paramecium 24-28 μm small variety ? Japan, 1998 Movies
C. paramecium 24 x 10 μm Uruguay, 1999	C. paramecium stock 228, axenic μm Uruguay, 1999	C. paramecium stock Kei- μm Kyoto, 2000	C. paramecium stock Iso-1, axenic Japan, 199?
C. paramecium stock Iso-1, axenic Japan, 199?	C. paramecium 22-26 x 8-12 μm Kasai Seaside Park Tokyo, 2001	C. paramecium 25-28 x 9-12 μm Hasuda Saitama, 2002	C. paramecium 23 x 10 μm Kagami-gawa Kochi, 2002
C. paramecium 24-28 x 10-12 μm Kasuga Fukuoka, 2001	C. paramecium 27 x 9 μm Tsuchiura Ibaraki, 2002	C. paramecium 10 μm φ Yaku Island Kagoshima, 2001	C. paramecium ? 27 x 9 μm Kashiwa Chiba, 2002
C. paramecium μm φ Yamato Kanagawa, 2003	C. paramecium 25 x 9 μm φ Ogose town Saitama, 2003	C. paramecium μm φ Hikone Shiga, 2003	C. paramecium μm φ Hikone Shiga, 2003
C. paramecium μm φ Midorigaoka park Sukagawa Fukushima, 2003	C. paramecium μm φ Near Shinrin-koen Namegawa Saitama, 2003	C. paramecium 27 x 10 μm Kumakubo Nasu-shiobara Tochigi, 2005
Posterior curved
C. paramecium ? 28 x 13 μm posterior curved Niigata, 2001	C. paramecium ? 23 x 10 μm posterior curved Chiba, 2001	C. paramecium ? 24 x 11 μm posterior curved Kuroiso Tochigi, 2002	C. paramecium ? μm posterior curved Moroyama town Saitama, 2003
Small variety ?
C. paramecium 24-28 μm small variety ? Saitama, 1999	C. paramecium 23-26 x 8-9 μm small variety ? Shirahata-Numa Saitama, 2001	C. paramecium 22 x 8 μm small variety ? Hanazono Saitama, 2001	C. paramecium 21 x 7 μm Tsuchiura Ibaraki, 2002
C. paramecium ? 23 x 12 μm Yamato Kanagawa, 2003	C. paramecium ? μm Shimo-takatsu Tsuchiura Ibaraki, 2003
misc.
C. paramecium 25 x 10 μm ectosymbiont ? Ichikawa Chiba, 2001	C. paramecium stock Cat-9b, axenic abnormal 22 x 14 μm Chiba, 2000
Chilomonas sp. 12 x 9 μm abnormal ? 1998	Chilomonas sp. ? 29 x 19 μm abnormal ? 1998	Chilomonas sp. ? or similar species μm Izumi-no-mori-koen Yamato Kanagawa, 2003	Chilomonas ? 14 x 8 μm abnormal ? Ibaraki, 2000

Similar genus -->> Cryptomonas; Chroomonas;

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