Phylum Porifera Grant, 1836 - sponges Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885 Subclass Tetractinomorpha Lévi, 1953 see Class Demospongiae Sollas, 1885 1 Order †Streptosclerophorida Dendy, 1924 [monotypic] 2 Order †Hadromerida Topsent, 1894