Kingdom Protoctista Hogg, 1860
   Phylum Rhizopoda Dujardin, 1835 - rhizopods see Phylum Cercozoa Cavalier-Smith, 1998
     Class Lobosea (Carpenter, 1861) Cavalier-Smith, 1993 see Subphylum Lobosa Carpenter, 1861
       Subclass Gymnamoebia (Haeckel, 1862) Cavalier-Smith, 1993 see [unranked] Gymnamoebae
         Order Amoebida - naked lobosid amebas see Class Amoebaea
           Suborder Thecina see Order Euamoebida Lepşi, 1960
             Family Thecamoebidae Schaeffer, 1926
               Genus Thecamoeba Fromentel, 1874