Phylum Porifera Grant, 1836 - sponges
   Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885
     Subclass †Lithistida Schmidt, 1870
       Order Megalithistida Reid, 2004
         Suborder Megamorina Zittel, 1878
           1 Family †Archaeodorydermatidae Reid, 1968
           2 Family †Saccospongiidae Rigby & Dixon, 1979
           3 Family †Nexospongiidae Carrera, 1996
           4 Family Pleromatidae Sollas, 1888