Phylum Porifera Grant, 1836 - sponges
Count: [o†f] 3c;29o;74f; †1c;9o;134f [17 Jul 2018]
   Class Hexactinellida Schmidt, 1870 - hexactinellids
  Count: [f†f] 5o;15f; †1o;41f [17 Jul 2018]
     Subclass Hexasterophora Schulze, 1886
    Count: [f†f] 3o;13f; †26f;233g [17 Jul 2018]
       Order Hexactinosa Schrammen, 1903 see Order Hexactinosida Schrammen, 1903
      Count: [f†f] 7f; †10f;101g [17 Jul 2018]
         Family †Cystispongiidae Reid, 2004 [monotypic]
        Count: [†g] †1g
           Genus †Cystispongiaᵀ Roemer, 1864
          Count: -