Kingdom Protozoa Goldfuss, 1818 - protozoa
   Subkingdom Gymnomyxa (Lankester, 1878) Cavalier-Smith, 2002 see Kingdom Protozoa Goldfuss, 1818
     Infrakingdom Rhizaria Cavalier-Smith, 2002
       Phylum Retaria Cavalier-Smith, 2002
         Subphylum Radiolaria Müller, 1858 see Subphylum Radiozoa Cavalier-Smith, 1987
           Class Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
             1 Genus Thalassicolla Huxley, 1851
             2 Genus Sphaerozoum Meyen, 1834