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 Genus †Trichospongia Billings, 1865