[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875
     Family Actinommidae Haeckel, 1862
       Genus †Pentactinosphaera Nagata & Nishimura, 1983
         1 †Pentactinosphaera hokurikuensis (Nakaseko, 1955)