[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Nassellaria Ehrenberg, 1875 see Class Nassellaria Ehrenberg, 1847
     Family Plagiacanthidae Hertwig, 1879
       Genus Amphiplecta Haeckel, 1881
         1 Amphiplecta acrostoma Haeckel, 1887
         2 †Amphiplecta cylindrocephala Dumitrica, 1973