Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Pentacoela
           Subphylum Brachiata
             Class Pogonophora Johansson, 1937 see Family Siboglinidae Caullery, 1914
               Subclass Frenulata
                 Order †Hyolithellida Syssoiev, 1957