Phylum Porifera Grant, 1836 - sponges Class Calcarea Bowerbank, 1864 - calcareous sponges Subclass Calcaronea Bidder, 1898 1 Order Leucosolenida Hartman, 1958 [monotypic] 2 Order Sycettida Bidder, 1898 see Order Leucosolenida Hartman, 1958 3 Order Stellispongiida Finks & Rigby, 2004 4 Order †Sphaerocoeliida Vacelet, 1979 [monotypic] 5 Order Lithonida Döderlein, 1892