[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
Status: extant
   Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847
  Status: extant
     Family Theoperidae Haeckel, 1881
    Status: extant
       Genus †Lithapium Haeckel, 1887
      Status: fossil
         †Lithapium mitra (Ehrenberg, 1873)
        Period: Paleogene (66 - 23.03 Ma); Status: fossil