Phylum Radiolaria Müller, 1858 see Subphylum Radiozoa Cavalier-Smith, 1987
   Superclass Polycystina Ehrenberg, 1838 see Superclass Polycystinia Ehrenberg, 1838
     Class Sphaerellaria Haeckel, 1881
       Order Sphaerellata Haeckel, 1887
         Family Xiphostylidae Haeckel, 1881
           Subfamily †Entapiinae Dumitrica, 2001
             1 Genus †Entapium Sanfilippo & Riedel, 1973
             2 Genus †Zealithapium O'Connor, 1999