[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847
     Family Theoperidae Haeckel, 1881
       Genus Stichopilium Haeckel, 1881
         1 Stichopilium bicorne Haeckel, 1887
         2 †Stichopilium variabilis Popofsky, 1908