Kingdom [Animalia] Linnaeus, 1758 - animals
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
       Class Reptilia Linnaeus, 1758 - reptiles
         Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903
           1 Order †Pelycosauria Cope, 1878 - pelycosaurs
           2 Order †Therapsida Broom, 1905 see [unranked] Therapsida Broom, 1905