Kingdom Animalia Linnaeus, 1758 - animals Phylum Porifera Grant, 1836 - sponges Class Demospongiae Sollas, 1885 - demosponges Order Haplosclerida Topsent, 1928 Suborder Petrosina Boury-Esnault & van Beveren, 1982 1 Family Phloeodictyidae Carter, 1882 2 Family Petrosiidae van Soest, 1980 3 Family Calcifibrospongiidae Hartman, 1979 [monotypic]