Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Lychniscosa Schrammen, 1903 see Order Lychniscosida Schrammen, 1903 Family †Ventriculitidae Smith, 1847 Subfamily †Stauronematinae Sollas, 1877 [monotypic] 1 Genus †Stauronema Sollas, 1877