Phylum Porifera Grant, 1836 - sponges
   Class Hexactinellida Schmidt, 1870 - hexactinellids
     Subclass Hexasterophora Schulze, 1886
       Order Hexactinosa Schrammen, 1903 see Order Hexactinosida Schrammen, 1903
         Family Euretidae Zittel, 1877
           Subfamily Euretinae Zittel, 1877
             01 Genus †Alosculum Wu, 1990
             02 Genus †Dracospongia Rigby, Xichun & Jiasong, 1998
             03 Genus †Radioplica Wu, 1990
             04 Genus †Linonema de Laubenfels, 1955
             05 Genus †Mastodictyum Sollas, 1883
             06 Genus †Ordinatus de Laubenfels, 1955
             07 Genus †Plectospyris Sollas, 1883
             08 Genus †Polypyge Schrammen, 1936
             09 Genus †Ramispongia Quenstedt, 1877
             10 Genus †Eurete Semper, 1868
             11 Genus †Verrucocoelia Étallon, 1859
             12 Genus †Blondetia Hérenger, 1944
             13 Genus †Lopanella Pocta, 1883
             14 Genus †Nemarete Reid, 1961
             15 Genus †Pseudocavispongia Hérenger, 1944
             16 Genus †Wapkiosa de Laubenfels, 1955
             17 Genus †Zittelispongia Sintzov', 1879
             18 Genus †Myliusia Gray, 1859
             19 Genus †Pararete Ijima, 1927
             20 Genus †Periphragella Marshall, 1875
             21 Genus †Pleurochorium Schrammen, 1912
             22 Genus †Heterochone Ijima, 1927
             23 Genus †Plecteurete Herrmann-Degen, 1980