Phylum Radiolaria Müller, 1858 see Subphylum Radiozoa Cavalier-Smith, 1987
   Superclass Polycystina Ehrenberg, 1838 see Superclass Polycystinia Ehrenberg, 1838
     Class Sphaerellaria Haeckel, 1881
       Order Actinommata Haeckel, 1862
         Family Heliodiscidae Haeckel, 1881
           1 Genus Excentrococcus Dumitrica, 1978
           2 Genus Excentrodiscus Hollande & Enjumet, 1960
           3 Genus Excentrosphaerella Dumitrica, 1978
           4 Genus Heliodiscus Haeckel, 1862