Phylum Porifera Grant, 1836 - sponges
   Class Hexactinellida Schmidt, 1870 - hexactinellids
     Subclass Hexasterophora Schulze, 1886
       Order Hexactinosa Schrammen, 1903 see Order Hexactinosida Schrammen, 1903
         Family Cribrospongiidae Roemer, 1864
           Genus †Guettardiscyphia Fromentel, 1860
             1 Subgenus †G. (Guettardiscyphia) Fromentel, 1860
             2 Subgenus †G. (Hillendia) Reid, 1964
             3 Subgenus †G. (Koleostoma) Regnard, 1925