Phylum Porifera Grant, 1836 - sponges Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885 Subclass †Lithistida Schmidt, 1870 Order Spirosclerophorida Reid, 1963 Suborder Rhizomorina Zittel, 1895 Superfamily Scleritodermatoidea Sollas, 1888 Genus †Reiswigia Trammer, 1979