[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847
     Family Theoperidae Haeckel, 1881
       Genus †Phormocyrtis Haeckel, 1887
         1 †Phormocyrtis alexandrae O'Connor, 1997
         2 †Phormocyrtis cubensis (Riedel & Sanfilippo, 1971)
         3 †Phormocyrtis embolum Ehrenberg, 1873
         4 †Phormocyrtis proxima Clark & Campbell, 1942
         5 †Phormocyrtis striata Brandt, 1935
         6 †Phormocyrtis turgida (Krasheninnikov, 1960)