Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Porifera Grant, 1836 - sponges
     Class Hexactinellida Schmidt, 1870 - hexactinellids
       Subclass Hexasterophora Schulze, 1886
         Order Hexactinosida Schrammen, 1903
           1 Family Aphrocallistidae Gray, 1867
           2 Family Auloplacidae Schrammen, 1912
           3 Family Craticulariidae Rauff, 1893
           4 Family Cribrospongiidae Roemer, 1864
           5 Family Dactylocalycidae Gray, 1867
           6 Family Euretidae Zittel, 1877
           7 Family Farreidae Gray, 1872
           8 Family Tretodictyidae Schulze, 1886