Phylum Porifera Grant, 1836 - sponges Subphylum Hexactinellida Schmidt, 1870 see Class Hexactinellida Schmidt, 1870 Class Hexasterophora F.E. von Schulze see Subclass Hexasterophora Schulze, 1886 1 Order Lyssacinosida Zittel, 1877 2 Order Hexactinosida Schrammen, 1903 3 Order Lychniscosida Schrammen, 1903