Phylum Porifera Grant, 1836 - sponges
   Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885
     Subclass Clavaxinellida Lévi, 1956
       Order Protomonaxonida Finks & Rigby, 2004
         Family †Heliospongiidae Finks, 1960
           1 Genus †Coelocladia Girty, 1908
           2 Genus †Coelocladiella Finks, 1960
           3 Genus †Heliospongia Girty, 1908
           4 Genus †Neoheliospongia Deng, 1981
           5 Genus †Spitsbergenia Hurcewicz, 1983