Phylum Radiolaria Müller, 1858 see Subphylum Radiozoa Cavalier-Smith, 1987
   Superclass Polycystina Ehrenberg, 1838 see Superclass Polycystinia Ehrenberg, 1838
     Class Sphaerellaria Haeckel, 1881
       Order Entactiniata Kozur & Mostler, 1982
         Family †Entactiniidae Riedel, 1967
           Subfamily †Bientactinosphaerinae Afanasieva, 1999
             Genus †Sepsagon Dumitrica, Kozur & Mostler, 1980