Kingdom Animalia Linnaeus, 1758 - animals Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Lychniscosida Schrammen, 1903 1 Family Aulocystidae Sollas, 1887 see Family Neoaulocystidae Zhuralevleva, 1962 2 Family Diapleuridae Ijima, 1927 [monotypic]