Class Lobosea (Carpenter, 1861) Cavalier-Smith, 1993 see Subphylum Lobosa Carpenter, 1861
   Subclass Gymnamoebia (Haeckel, 1862) Cavalier-Smith, 1993 see [unranked] Gymnamoebae
     Order Euamoebida Lepşi, 1960
       Family Amoebidae Ehrenberg, 1838
         Genus Chaos Linnaeus, 1767
           1 Chaos carolinense (Wilson, 1900)
           3 Chaos nobile (Penard, 1902)
           4 Chaos glabrum Smirnov & Goodkov, 1997
           5 Chaos illinoisense (Kudo, 1950)