Phylum Radiolaria Müller, 1858 see Subphylum Radiozoa Cavalier-Smith, 1987
   Superclass Polycystina Ehrenberg, 1838 see Superclass Polycystinia Ehrenberg, 1838
     Class Spumellaria Ehrenberg, 1875
       Order †Spongiata Afanasieva & Amon, 2003
         Family †Spongentactiniidae Nazarov, 1975
           1 Subfamily †Retentactiniinae Won, 1997
           2 Subfamily †Spongentactiniinae Nazarov, 1975
           3 Subfamily †Pluristratoentactiniinae Afanasieva, 1999