Phylum Porifera Grant, 1836 - sponges
   Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885
     Subclass Clavaxinellida Lévi, 1956
       Order Protomonaxonida Finks & Rigby, 2004
         Family Sollasellidae Lendenfeld, 1887 see Family Raspailiidae Hentschel, 1923
           1 Genus †Trichospongia Billings, 1865
           2 Genus †Coniculospongia Rigby & Clement, 1995
           3 Genus †Ginkgospongia Rigby & Clement, 1995
           4 Genus †Sphaeriella Rigby & Bryant, 1979
           5 Genus †Opetionella Zittel, 1878
           6 Genus †Rhizopsis Schrammen, 1910
           7 Genus †Sollasella Lendenfeld, 1888