Phylum Porifera Grant, 1836 - sponges Class Hexactinellida Schmidt, 1870 - hexactinellids Subclass Hexasterophora Schulze, 1886 Order Lyssacinosa Zittel, 1877 see Order Lyssacinosida Zittel, 1877 Superfamily †Brachiospongioidea Beecher, 1889 Family †Pyruspongiidae Rigby, 1971 [monotypic] Genus †Pyruspongia Rigby, 1971