Phylum Porifera Grant, 1836 - sponges Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885 Subclass †Lithistida Schmidt, 1870 Order Monalithistida Lagneau-Hérenger, 1955 Suborder Sphaerocladina Schrammen, 1910 Family Vetulinidae Lendenfeld, 1903 Subfamily Vetulininae Lendenfeld, 1903 Genus †Vetulina Schmidt, 1879