Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Hexactinosa Schrammen, 1903 see Order Hexactinosida Schrammen, 1903 Superfamily †Pillaraspongioidea Rigby, 1986 [monotypic] 1 Family †Pillaraspongiidae Rigby, 1986 [monotypic]