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 Lyssacinosida Zittel, 1877 Family Euplectellidae Gray, 1867 1 Subfamily Euplectellinae Gray, 1867 2 Subfamily Corbitellinae Gray, 1872