Kingdom Animalia Linnaeus, 1758 - animals Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Lyssacinosida Zittel, 1877 1 Family Euplectellidae Gray, 1867 2 Family Leucopsacidae Ijima, 1898 3 Family Rossellidae Schulze, 1885