[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875
     Family Pyloniidae Haeckel, 1881
       Genus Spirema Haeckel, 1881
         1 †Spirema circularis Nakaseko, 1973
         2 Spirema melonia Haeckel, 1887