Phylum Porifera Grant, 1836 - sponges
   Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885
     Subclass Clavaxinellida Lévi, 1956
       Order Protomonaxonida Finks & Rigby, 2004
         01 Family †Leptomitidae de Laubenfels, 1955
         02 Family †Sinospongiidae Finks & Rigby, 2004 [monotypic]
         03 Family †Hamptoniidae de Laubenfels, 1955
         04 Family †Ulospongiellidae Rigby & Collins, 2004
         05 Family †Choiidae de Laubenfels, 1955
         06 Family †Wapkiidae de Laubenfels, 1955 [monotypic]
         07 Family †Halichondritidae Rigby, 1986
         08 Family †Piraniidae de Laubenfels, 1955
         09 Family Sollasellidae Lendenfeld, 1887 see Family Raspailiidae Hentschel, 1923
         10 Family Tethyidae Gray, 1867
         11 Family †Hazeliidae de Laubenfels, 1955
         12 Family †Takakkawiidae de Laubenfels, 1955 [monotypic]
         13 Family †Mahalospongiidae Rigby & Stuart, 1988 [monotypic]
         14 Family †Heliospongiidae Finks, 1960