Phylum Radiolaria Müller, 1858 see Subphylum Radiozoa Cavalier-Smith, 1987
   Superclass Polycystina Ehrenberg, 1838 see Superclass Polycystinia Ehrenberg, 1838
     Class Sphaerellaria Haeckel, 1881
       Order Sphaerellata Haeckel, 1887
         Family Xiphostylidae Haeckel, 1881
           Subfamily †Xiphostylinae Haeckel, 1881
             1 Genus †Archaeocenosphaera Pessagno & Yang, 1989
             2 Genus †Suna Wu, 1986
             3 Genus †Triactoma Rüst, 1885
             4 Genus †Tripocyclia Haeckel, 1881
             5 Genus †Xiphostylus Haeckel, 1881
             6 Genus †Zanola Pessagno & Yang, 1989, nom. illeg.