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 Testacealobosa see Subclass Testacealobosia de Saedeleer, 1934
         Order Arcellinidae see Order Arcellinida Kent, 1880
           Family Difflugiidae Wallich, 1864
             Genus Difflugia Leclerc, 1815