Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
   Opisthokonta Cavalier-Smith, 1987 - opisthokonts see Clade Opisthokonta Cavalier-Smith 1987, nom. cl. inval.
     Metazoa Haeckel 1874 - multicellular animals see Kingdom Animalia Linnaeus, 1758
       Phylum Porifera Grant, 1836 - sponges
         Subphylum Cellularia Reiswig & Mackie, 1983 see Phylum Porifera Grant, 1836
           Class Calcarea Bowerbank, 1864 - calcareous sponges
             1 Subclass Calcinea Bidder, 1898
             2 Subclass Calcaronea Bidder, 1898