[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 Spongodiscidae Haeckel, 1862
    Count: [*†*] 13g;22s;2ss; †15g;60s;5ss [25 Oct 2018]
       Genus †Schizodiscus Dogiel, 1952, nom. illeg.
      Count: [†*] †3s;1ss [25 Oct 2018]
         †Schizodiscus favus (Ehrenberg, 1861)
        Count: [†*] †1ss
           1 †Schizodiscus favus maxima (Popofsky, 1908)
          Count: -