[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 Zygocircus Bütschli, 1881
         Zygocircus productus (Hertwig, 1879)
           1 Zygocircus productus capulosus Popofsky, 1913
           2 †Zygocircus productus tricarinatus Goll, 1979