Phylum Porifera Grant, 1836 - sponges
   Class Demospongea Sollas, 1875 see Class Demospongiae Sollas, 1885
     Subclass Choristida Sollas, 1880 see Order Tetractinellida Marshall, 1876
       Order Plakinida Reid, 1968 see Order Homosclerophorida Dendy, 1905
         Family Plakinidae Schulze, 1880
           1 Genus †Plakina Schulze, 1880
           2 Genus †Acanthoplakina Burton, 1959
           3 Genus †Corticium Schmidt, 1862