Phylum Porifera Grant, 1836 - sponges Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885 Subclass Ceractinomorpha Lévi, 1953 see Class Demospongiae Sollas, 1885 Order †Agelasida Hartman, 1980 Family †Olangocoeliidae Bechstädt & Brandner, 1970 [monotypic] 1 Genus †Olangocoelia Bechstädt & Brandner, 1970