Phylum Porifera Grant, 1836 - sponges Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885 Subclass Tetractinomorpha Lévi, 1953 see Class Demospongiae Sollas, 1885 Order †Hadromerida Topsent, 1894 Family †Polysiphonidae Girty, 1909 ?Genus †Arbusculana Finks & Rigby, 2004