Phylum [Vertebrata] (Lamarck, 1801)
   Class Reptilia Linnaeus, 1758 - reptiles
     Subclass †uncertain
       Order †Placodontia Owen, 1859
         1 Family †Placodontidae Cope, 1871
         2 Family †Cyamodontidae Nopcsa, 1923
         3 Family †Henodontidae Huene, 1936