Phylum Porifera Grant, 1836 - sponges
   Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885
     Subclass †Lithistida Schmidt, 1870
       Order Spirosclerophorida Reid, 1963
         Suborder Rhizomorina Zittel, 1895
           Superfamily Platychonioidea Schrammen, 1924
             Family †Discostromatidae Schrammen, 1924
               1 Subfamily †Discostromatinae Schrammen, 1924
               2 Subfamily †Pyrgochoniinae Schrammen, 1924