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
           Subfamily †Retentactiniinae Won, 1997
             1 Genus †Fungomacula Won, 1999
             2 Genus †Pararcheoentactinia Won & Iams, 2002
             3 Genus †Retentactinia Won, 1997
             4 Genus †Tetragregnon Ormiston & Lane, 1976