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 Rossellidae Schulze, 1885
           Subfamily Rossellinae Schulze, 1885
             Genus Scolymastra Topsent, 1916 see Subgenus Scolymastra Topsent, 1916
               Scolymastra joubini Topsent, 1916