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 Scleritodermatoidea Sollas, 1888
             Family Scleritodermatidae Sollas, 1888
               Subfamily †Amphithelioninae Schrammen, 1924
                 Genus †Scythophymia Pomel, 1872