Phylum Radiolaria Müller, 1858 see Subphylum Radiozoa Cavalier-Smith, 1987
   Superclass Polycystina Ehrenberg, 1838 see Superclass Polycystinia Ehrenberg, 1838
     Class Nassellaria Ehrenberg, 1847
       Order †Pylomariata Afanasieva, 1999
         Superfamily †Popofskyelloidea Deflandre, 1964
           Family †Hexapylocapsidae Dumitrica & Zügel, 1998 [monotypic]
             1 Genus †Hexapylocapsa Dumitrica & Zügel, 1998