Phylum Porifera Grant, 1836 - sponges
   Subphylum Hexactinellida Schmidt, 1870 see Class Hexactinellida Schmidt, 1870
     Class Hexasterophora F.E. von Schulze see Subclass Hexasterophora Schulze, 1886
       Order Hexactinosida Schrammen, 1903
         Family Euretidae Zittel, 1877
           Genus Bathyxiphus Schulze, 1899
           Genus Chonelasma Schulze, 1886
           Genus Conorete Ijima, 1927
           Genus Eurete Semper, 1868
           Genus Gymnorete Ijima, 1927
           Genus Heterorete Dendy, 1916
           Genus Iphiteon Bowerbank, 1869
           Genus Lefroyella Thomson, 1877
           Genus Margaritella Schmidt, 1880, nom. illeg. see Genus Iphiteon Bowerbank, 1869
           Genus Myliusia Gray, 1859
           Genus Pararete Ijima, 1927
           Genus Periphragella Marshall, 1875
           Genus Pleurochorium Schrammen, 1912
           Genus Ptychodesia Schrammen, 1912