Phylum Porifera Grant, 1836 - sponges
   Class Hexactinellida Schmidt, 1870 - hexactinellids
     Subclass Amphidiscophora Schulze, 1886
       Order Reticulosa Reid, 1958
         Superfamily †Dictyospongioidea Hall & Clarke, 1899
           Family †Dictyospongiidae Hall & Clarke, 1898
             Subfamily †Prismodictyinae de Laubenfels, 1955
               ?Genus †Ithacadictya Caster, 1939
               1 Genus †Tiddalickia Rigby & Webby, 1988
               2 ?Genus †Dictyophytra Rauff, 1894
               3 Genus †Prismodictya Hall & Clarke, 1898
               4 Genus †Norfordia Rigby & Harris, 1979
               5 ?Genus †Dictyophyton Hall, 1863
               6 ?Genus †Helicodictya Hall & Clarke, 1898