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 Lyssacinosida Zittel, 1877
         Family Euplectellidae Gray, 1867
           Subfamily Euplectellinae Gray, 1867
             Genus Acoelocalyx Topsent, 1910
             Genus Docosaccus Topsent, 1910
             Genus Euplectella Owen, 1841
             Genus Holascella Lendenfeld, 1915 see Genus Holascus Schulze, 1886
             Genus Holascus Schulze, 1886
             Genus Malacosaccus Schulze, 1886