Phylum Protozoa (Goldfuss, 1818) C.T. von Siebold, 1854 see Kingdom Protozoa Goldfuss, 1818
   Subphylum Sarcomastigophora see Phylum Sarcomastigophora Honigberg & Balamuth, 1963
     Superclass Sarcodina see Class Sarcodina
       Class Actinopodea see Subclass Actinopoda Calkins, 1902
         1 Subclass Radiolaria Müller, 1858 see Phylum Actinopoda Calkins, 1902
         2 Subclass Acantharia see Class Acantharea Haeckel, 1881
         3 Subclass Heliozoia see [unranked] Heliozoa
         4 Subclass Proteomyxidia see Class Proteomyxidea Cavalier-Smith, 2002