[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
Count: [*†*] 2o;18f;204g;393s;12ss; †2f;149g;793s;71ss;1v [25 Oct 2018]
   Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875
  Count: [*†*] 8f;87g;151s;3ss; †1f;48g;211s;17ss [25 Oct 2018]
     Family Pyloniidae Haeckel, 1881
    Count: [*†*] 10g;12s; †2g;5s [25 Oct 2018]
       Genus Spirema Haeckel, 1881
      Count: [*†*] 1s; †1s [25 Oct 2018]
         †Spirema circularis Nakaseko, 1973
        Count: -