fossil marine animal genera Linnaeus, 1758 - animals
   Phylum Porifera Grant, 1836 - sponges
     Class Calcarea Bowerbank, 1864 - calcareous sponges
       1 Order †Heteractinida Hinde, 1887 see Class Heteractinida de Laubenfels, 1955
       2 Order Calcaronea Bidder, 1898 see Subclass Calcaronea Bidder, 1898
       3 Order Pharetronida Zittel, 1878 see Subclass Pharetronidia
       4 ?Order †Permosphincta Termier & Termier, 1974
       5 Order †Sphaerocoelida Vacelet, 1979 see Order Sphaerocoeliida Vacelet, 1979
       6 Order †uncertain