Phylum Porifera Grant, 1836 - sponges Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885 Subclass †Lithistida Schmidt, 1870 Order Tetralithistida Lagneau-Hérenger, 1962 Suborder Dicranocladina Schrammen, 1924 Family Corallistidae Sollas, 1888 Subfamily †Gignouxiinae de Laubenfels, 1955 Genus †Pycnoclonella Lagneau-Hérenger, 1962