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 Order Hexactinosida Schrammen, 1903 Family Farreidae Gray, 1872 Genus Sarostegia Topsent, 1904