Phylum Porifera Grant, 1836 - sponges Class Calcarea Bowerbank, 1864 - calcareous sponges Subclass Calcaronea Bidder, 1898 Order Sycettida Bidder, 1898 see Order Leucosolenida Hartman, 1958 Family Leuconiidae Vosmaer, 1887 see Family Grantiidae Dendy, 1893