[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847
     Family Trissocyclidae Haeckel, 1881 see Family Acanthodesmiidae Haeckel, 1862
       Genus †Eucoronis Haeckel, 1881
         1 †Eucoronis fridtjofnanseni Goll & Bjørklund, 1980
         2 †Eucoronis hertwigii (Bütschli, 1881)