Phylum Porifera Grant, 1836 - sponges Class Calcarea Bowerbank, 1864 - calcareous sponges Subclass Calcinea Bidder, 1898 Order Murrayonida Vacelet, 1981 1 Family Murrayonidae Kirkpatrick, 1910 2 Family Paramurrayonidae Vacelet, 1967