[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875
     Family Pyloniidae Haeckel, 1881
       Genus Tetrapyle Müller, 1858
         1 Tetrapyle octacantha Müller, 1858