Kingdom Animalia Linnaeus, 1758 - animals Phylum Porifera Grant, 1836 - sponges 1 Class Homoscleromorpha Dendy, 1905 [monotypic] 2 Class Demospongiae Sollas, 1885 - demosponges 3 Class Calcarea Bowerbank, 1864 - calcareous sponges 4 Class Hexactinellida Schmidt, 1870 - hexactinellids 5 Class †Heteractinida de Laubenfels, 1955