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 †Pachinioninae Schrammen, 1924 [monotypic] Genus †Pachinion Zittel, 1878