Phylum Porifera Grant, 1836 - sponges
   Class Hexactinellida Schmidt, 1870 - hexactinellids
     Subclass Hexasterophora Schulze, 1886
       Order Hexactinosa Schrammen, 1903 see Order Hexactinosida Schrammen, 1903
         Family Tretodictyidae Schulze, 1886
           Subfamily Tretodictyinae Schulze, 1886
             Genus †Hexactinella Carter, 1885
               1 Subgenus †H. (Parahexactinella) Reid, 1963
               2 Subgenus †H. (Hexactinella) Carter, 1885