Kingdom Animalia Linnaeus, 1758 - animals
   Phylum †Archaeocyathida Okulitch, 1935
     Class †Regulares Vologdin, 1937 see Class Archaeocyatha Bornemann, 1884
       1 Order †Monocyathida Okulitch, 1935
       2 Order †Capsulocyathida Zhuravleva, 1964
       3 Order †Ajacicyathida Bedford & Bedford, 1939