Phylum Porifera Grant, 1836 - sponges
   Class Hexactinellida Schmidt, 1870 - hexactinellids
     Subclass Hexasterophora Schulze, 1886
       Order Hexactinosa Schrammen, 1903 see Order Hexactinosida Schrammen, 1903
         Family Farreidae Gray, 1872
           1 Genus †Hormathospongia Rigby, Embree & Murphy, 1996
           2 Genus †Farrea Bowerbank, 1862
           3 Genus †Chonodictyon Reid, 1958 see Genus Farrea Bowerbank, 1862
           4 Genus †Phyllobrochis Reid, 1958 see Genus Farrea Bowerbank, 1862