Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Lychniscosa Schrammen, 1903 see Order Lychniscosida Schrammen, 1903 Family †Sporadopylidae Schrammen, 1936 1 Genus †Favispongia Quenstedt, 1877 2 Genus †Xenoschrammenum de Laubenfels, 1955 3 Genus †Sestrodictyon Hinde, 1883