Subphylum [Vertebrata] Cuvier, 1812 - vertebrates
   Class Agnatha Cope, 1889
     Subclass †Thelodonti Kiaer, 1932
       Order †Shieliiformes Märss, Wilson & Thorsteinsson, 2002 [monotypic]
         1 Family †Shieliidae Märss, Wilson & Thorsteinsson, 2002