[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847
     Family Plagiacanthidae Hertwig, 1879
       Genus Trisulcus Popofsky, 1913, nom. illeg.
         1 Trisulcus nana (Popofsky, 1913)
         2 Trisulcus triacanthus Popofsky, 1913