Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Hexactinosa Schrammen, 1903 see Order Hexactinosida Schrammen, 1903 Superfamily Pileolitoidea Finks, 1960 Family †Craticulariidae Rauff, 1893 Genus †Urnospongia Rigby & Pisera, 2001