Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Lychniscosa Schrammen, 1903 see Order Lychniscosida Schrammen, 1903 Family †Polyblastidiidae Schrammen, 1912 1 Genus †Phlyctaenium Zittel, 1879 2 Genus †Coeloscyphia Tate, 1865