Phylum Porifera Grant, 1836 - sponges
   Class Hexactinellida Schmidt, 1870 - hexactinellids
     Order Hexactinosida Schrammen, 1903
       1 Family Aphrocallistidae Gray, 1867
       2 Family Craticulariidae Rauff, 1893
       3 Family Cribrospongiidae Roemer, 1864
       4 Family Dactylocalycidae Gray, 1867
       5 Family Euretidae Zittel, 1877
       6 Family Farreidae Gray, 1872
       7 Family Tretodictyidae Schulze, 1886