Phylum Porifera Grant, 1836 - sponges
   Class Hexactinellida Schmidt, 1870 - hexactinellids
     Subclass Hexasterophora Schulze, 1886
       Order Hexactinosa Schrammen, 1903 see Order Hexactinosida Schrammen, 1903
         Family †Staurodermatidae Zittel, 1877
           1 Genus †Polyschema Oppliger, 1915
           2 Genus †Rhodanospongia Moret, 1927
           3 Genus †Saynospongia Moret, 1927
           4 Genus †Stauroderma Zittel, 1878
           5 Genus †Zittellospongia Malfatti, 1901 see Genus Zittelospongia Malfatti, 1901
           6 Genus †Placochlaenia Pomel, 1872