Polychaos

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| taxon = Polychaos

| authority = Schaeffer 1926{{cite journal| title= Taxonomy of the amebas, with descriptions of thirty-nine new marine and freshwater species| journal= Papers from the Department of Marine Biology of the Carnegie Institution of Washington.| author = Schaeffer, Asa Arthur| year = 1926a| volume = 24| pages = 115 pp. 12 plates| url = http://www.ciw.edu/publications_online/amebas/default.html}}

| type_species = Polychaos dubium

| type_species_authority = (Schaeffer 1916) Schaeffer 1926

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Polychaos is an amoeboid genus in the Amoebozoa group.{{cite web |url=http://www.bms.ed.ac.uk/research/others/smaciver/amoebae.htm |title=The Amoebae |access-date=2009-06-25}} Several characters unite the species in this genus. The pseudopods meld at their bases when the organism is moving, and have dorsal, longitudinal ridges. The nucleus is oval or ellipsoidal.{{cite book| editor1= Lee, J.J. | editor2=Hutner, S.H. | editor3=Bovee, E.C.| year = 1985| title = Illustrated Guide to the Protozoa| pages = ix + 630 pages| publisher = Society of Protozoologists| location = Lawrence, Kansas}}