Kingdom Animalia Linnaeus, 1758 - animals
   Phylum †Archaeocyathida Okulitch, 1935
     Class †Irregulares Vologdin, 1937 see Class Archaeocyatha Bornemann, 1884
       1 Order †Thalassocyathida
       2 Order †Archaeocyathida Okulitch, 1935
       3 Order †Kazakhstanicyathida