Phylum Porifera Grant, 1836 - sponges Subphylum Hexactinellida Schmidt, 1870 see Class Hexactinellida Schmidt, 1870 1 Class Hexasterophora F.E. von Schulze see Subclass Hexasterophora Schulze, 1886 2 Class Amphidiscophora F.E. von Schulze see Subclass Amphidiscophora Schulze, 1886