Kingdom Animalia Linnaeus, 1758 - animals Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Aulocalycoida Tabachnick & Reiswig, 2000 1 Family Aulocalycidae Ijima, 1927 2 Family Uncinateridae Reiswig, 2002