fossil marine animal genera Linnaeus, 1758 - animals
   Phylum Porifera Grant, 1836 - sponges
     †"archaeocyathids"
       Class †Regulares Vologdin, 1937 see Class Archaeocyatha Bornemann, 1884
         1 Order †Monocyathida Okulitch, 1935
         2 Order †Ajacicyathida Bedford & Bedford, 1939
         3 Order †Capsulocyathida Zhuravleva, 1964
         4 Order †Tabulacyathida