Order: Ameboflagellates with 2 heterodynamic acronematic flagella (Illustrated Guide, 1985).
Genus: Biflagellate, both arising from anterior end; one directed anteriorly and the other runs backward over body surface as a trailing (recurrent) flagellum; body plastic (Kudo, 1966). Small (10-15 μm); body is generally pyriform to cylindrical except for an ameboid variable posterior (Illustrated Guide, 1985).

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C. crassicauda 20 μm posterior plastic cell division Kurome river Saitama, 1999 Movies	C. crassicauda ? 19 μm posterior plastic Kurome river Saitama, 1999	C. crassicauda ? 34 μm posterior plastic Japan, 1999
C. longicauda ? 19 μm Japan, 199?	Cercomonas sp.1 20 μm Saitama, 1999	Cercomonas sp.1 ? 14 x 7 μm Japan, 1999	Cercomonas sp.1 ? 14 x 8 μm Mizumoto Park Tokyo, 2001
Cercomonas sp. ? or Dimastigella ? cell 16 x 6.6 μm Otawara Tochigi, 2001	Cercomonas sp. ? or Dimastigella ? cell 10 x 5 μm Saitama, 1999, etc.
Cercomonas ?? 15 x 7 μm Toneri Park Tokyo, 2001	Cercomonas ?? μm Kawaguchi park Saitama, 2001	Cercomonas sp. μm Kamihira Park Ageo Saitama, 2003	Cercomonas sp. μm Shimo-akaiwa Matsubushi Saitama, 2003
Cercomonas sp. μm Shimo-akaiwa Tsuchiura Ibaraki, 2003	Cercomonas sp. 16 x 10 μm 10 x 6 μm Iruma river Sayama Saitama, 2004	Cercomonas sp. 16 x 10 μm near Kondo-numa Tatebayashi Gunma, 2006	Cercomonas sp. μm near Kurome river Higashikurume Tokyo, 2008
Cercomonas sp. ? μm Okahotto-Yatsu Abiko Chiba, 2008	Cercomonas sp. cell 10 x 6 μm Japan, 1998	Cercomonas sp. ? cell 10 x 5 μm Gyoda Saitama, 2001	Cercomonas sp.2 ? 14 μm, x 1000 body cylindrical Japan, 1999
Cercomonas sp.2 ? body cylindrical 17 x 4 μm Iwajuku Gunma, 2001	Cercomonas sp.2 ? body cylindrical 9 x 2.5 μm Toneri Park Tokyo, 2001	Cercomonas sp.2 ? body cylindrical 10 x 4 μm Tennoh Tessei-cho Okayama, 2004	Cercomonas ? μm Japan, 2000

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