Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Reptilia Linnaeus, 1758 - reptiles
     Subclass †uncertain
       Order †Placodontia Owen, 1859
         Family †Placodontidae Cope, 1871
           Genus †Placodus Agassiz, 1833