Phylum Porifera Grant, 1836 - sponges
   Class Hexactinellida Schmidt, 1870 - hexactinellids
     Subclass Amphidiscophora Schulze, 1886
       Order Amphidiscosa Schrammen, 1924 see Order Amphidiscosida Schrammen, 1924
         1 Family Hyalonematidae Gray, 1857
         2 Family †Pattersoniidae Miller, 1889
         3 Family †Pelicaspongiidae Rigby, 1970
         4 Family †Stiodermatidae Finks, 1960