Phylum Radiolaria Müller, 1858 see Subphylum Radiozoa Cavalier-Smith, 1987
   Superclass Polycystina Ehrenberg, 1838 see Superclass Polycystinia Ehrenberg, 1838
     Class Spumellaria Ehrenberg, 1875
       Order †Echidninata Kozur, Mostler & Repetski, 1996 [monotypic]
         Family †Echidninidae Kozur, Mostler & Repetski, 1996
           1 Genus †Curvechidnina Won & Iams, 2002
           2 Genus †Echidnina Bengtson, 1986
           3 Genus †Protoentactinia Kozur, Mostler & Repetski, 1996
           4 Genus †Subechidnina Won & Iams, 2002