Phylum Porifera Grant, 1836 - sponges Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885 Subclass Ceractinomorpha Lévi, 1953 see Class Demospongiae Sollas, 1885 Order Halichondrida Vosmaer, 1887 ?Family †Hymeniacidonidae de Laubenfels, 1936 see Family Halichondriidae Gray, 1867 1 Genus †Roepella van Kempen, 1977