Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Lychniscosa Schrammen, 1903 see Order Lychniscosida Schrammen, 1903 Family †Calyptrellidae Schrammen, 1912 [monotypic] 1 Genus †Calyptrella Schrammen, 1912