[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 Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847
  Count: [*†*] 10f;117g;242s;9ss; †1f;100g;581s;54ss;1v [25 Oct 2018]
     Family Trissocyclidae Haeckel, 1881 see Family Acanthodesmiidae Haeckel, 1862
    Count: [*†*] 17g;30s;7ss; †21g;110s;7ss [25 Oct 2018]
       Genus †Lithotympanum Haeckel, 1881
      Count: [†*] †1s [25 Oct 2018]
         †Lithotympanum tuberosum Haeckel, 1887
        Count: -