Phylum [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