Kingdom Animalia Linnaeus, 1758 - animals Phylum Porifera Grant, 1836 - sponges Class Demospongiae Sollas, 1885 - demosponges Subclass Lithistida Schmidt, 1870 Order Tetralithistida Lagneau-Hérenger, 1962 Suborder †Didymorina Rauff, 1893 [monotypic] see Suborder Didymmorina Rauff, 1893