[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875
     Family Actinommidae Haeckel, 1862
       Genus †Xiphatractus Haeckel, 1887
         1 †Xiphatractus brevispina Carnevale, 1908
         2 †Xiphatractus spumeus Dumitrica, 1973