Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Lychniscosa Schrammen, 1903 see Order Lychniscosida Schrammen, 1903 Family Callodictyonidae Zittel, 1878 Subfamily †Microblastidinae Schrammen, 1912 1 Genus †Microblastidium Schrammen, 1902 2 Genus †Spirolophia Pomel, 1872