Phylum Porifera Grant, 1836 - sponges Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885 Subclass Ceractinomorpha Lévi, 1953 see Class Demospongiae Sollas, 1885 Order Haplosclerida Topsent, 1928 Family Spongillidae Gray, 1867 Genus †Palaeospongilla Ott & Volkheimer, 1972