Phylum Porifera Grant, 1836 - sponges Count: - Class Calcarea Bowerbank, 1864 - calcareous sponges Count: - Class Demospongiae Sollas, 1885 - demosponges Count: - Class Hexactinellida Schmidt, 1870 - hexactinellids Count: - Class Sclerospongiae Hartman & Goreau, 1970 see Class Demospongiae Sollas, 1885 Count: - Class †Stromatoporoidea Nicholson & Murie, 1878 Count: -