[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 Stylotrochus Haeckel, 1862
      Count: [*†*] 1s;1ss; †4s;1ss [25 Oct 2018]
         Stylotrochus quadribrachiatus Sanfilippo & Riedel, 1973
        Count: [*†*] 1ss; †1ss
           Stylotrochus quadribrachiatus quadribrachiatus Sanfilippo & Riedel, 1973
          Count: -