Phylum Porifera Grant, 1836 - sponges
   Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885
     Subclass †Lithistida Schmidt, 1870
       Order Tetralithistida Lagneau-Hérenger, 1962
         Suborder Tetracladina Zittel, 1878
           Family †Plinthosellidae Schrammen, 1910
             1 Genus †Ingentilotus de Laubenfels, 1955
             2 Genus †Plinthosella Zittel, 1878
             3 Genus †Pycnodesma Schrammen, 1910