Phylum Radiolaria Müller, 1858 see Subphylum Radiozoa Cavalier-Smith, 1987
   Superclass Polycystina Ehrenberg, 1838 see Superclass Polycystinia Ehrenberg, 1838
     Class Stauraxonaria Afanasieva & Amon, 2005
       Order †Palaeodiscata Afanasieva & Amon, 2005 [monotypic]
         Family †Palaeodiscidaeᵀ Afanasieva, 2000
           Genus †Eostylodictya Ormiston & Lane, 1976