[Class] Polycystinea Ehrenberg, 1838 - polycystines see Superclass Polycystinia Ehrenberg, 1838
   Order Spumellaria Ehrenberg, 1875 see Class Spumellaria Ehrenberg, 1875
     Family Actinommidae Haeckel, 1862
       Genus †Spongatractus Haeckel, 1887
         1 †Spongatractus balbis Sanfilippo & Riedel, 1973
         2 †Spongatractus pachystylus (Ehrenberg, 1873)