Phylum Porifera Grant, 1836 - sponges Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885 Subclass Ceractinomorpha Lévi, 1953 see Class Demospongiae Sollas, 1885 Order Vaceletida Finks & Rigby, 2004 Family †Gigantothalamiidae Senowbari-Daryan, 1994 1 Genus †Gigantothalamia Senowbari-Daryan, 1994 2 Genus †Zanklithalamia Senowbari-Daryan, 1990