Phylum Porifera Grant, 1836 - sponges
   Class Demospongiae Sollas, 1885 - demosponges
     Order Halichondrida Vosmaer, 1887
       1 Family Axinellidae Carter, 1875
       2 Family Bubaridae Topsent, 1894
       3 Family Desmoxyidae Hallmann, 1917 see Family Heteroxyidae Dendy, 1905
       4 Family Dictyonellidae van Soest, Diaz & Pomponi, 1990
       5 Family Halichondriidae Gray, 1867