Phylum Porifera Grant, 1836 - sponges
   Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885
     Subclass Clavaxinellida Lévi, 1956
       Order Protomonaxonida Finks & Rigby, 2004
         Family †Hamptoniidae de Laubenfels, 1955
           1 Genus †Hamptonia Walcott, 1920
           2 Genus †Hamptoniella Rigby & Collins, 2004, nom. illeg.
           3 Genus †Lasiothrix Hinde, 1889
           4 Genus †Offela Rogers, Jackson & McKinney, 1964