[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847
     Family Theoperidae Haeckel, 1881
       Genus †Eusyringium Haeckel, 1881
         1 †Eusyringium fistuligerum (Ehrenberg, 1873)
         2 †Eusyringium lagena (Ehrenberg, 1873)
         3 †Eusyringium tubulus (Ehrenberg, 1854)