Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     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