Phylum Porifera Grant, 1836 - sponges
   Class Calcarea Bowerbank, 1864 - calcareous sponges
     Subclass Calcaronea Bidder, 1898
       Order Lithonida Döderlein, 1892
         1 Family Lepidoleuconiidae Finks & Rigby, 2004 see Family Lepidoleuconidae Vacelet, 1967
         2 Family Minchinellidae Dendy & Row, 1913
         3 Family Petrobionidae Borojevic, 1979