Phylum Porifera Grant, 1836 - sponges
   Class Hexactinellida Schmidt, 1870 - hexactinellids
     Subclass Amphidiscophora Schulze, 1886
       Order Reticulosa Reid, 1958
         Superfamily Dierespongioidea Rigby & Gutschick 1976
           Family Titusvillidae Caster, 1939 see Family Titusvilliidae Caster, 1939
             1 Genus †Armstrongia Clarke, 1920
             2 Genus †Iowaspongia Thomas, 1923
             3 Genus †Protoarmstrongia Caster, 1941
             4 Genus †Annulispongia Rigby & Moyle, 1959
             5 Genus †Titusvillia Caster, 1939
             6 Genus †Sclerothamnus Marshall, 1875