Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Lychniscosa Schrammen, 1903 see Order Lychniscosida Schrammen, 1903 Family †Coeloptychidae Roemer, 1864 Subfamily †Coeloptychinae Roemer, 1864 Genus †Coeloptychium Goldfuss, 1826 Subgenus †C. (Lophoptychium) Pomel, 1872