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 †Pantanelliidae Pessagno, 1977
           Subfamily †Pantanelliinae Pessagno, 1977
             Genus †Pachyonchus Pessagno & Blome, 1986 see Genus Pachyoncus Pessagno & Blome, 1980