Kingdom [Animalia] Linnaeus, 1758 - animals
Count: -
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
  Count: -
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
    Count: -
       Subdivision Bilateralia
      Count: -
         Phylum Chordata Bateson, 1885 - chordates
        Count: -
           Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
          Count: -
             Class Reptilia Linnaeus, 1758 - reptiles
            Count: -
               Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903
              Count: [†*] †3o;40f;9g;4s [7 Jan 2017]
                 Order †Pelycosauria Cope, 1878 - pelycosaurs
                Count: [†*] †8f;2g;1s [7 Jan 2017]
                   Suborder †Ophiacodontia (Romer & Price, 1940)
                  Count: [†*] †2f;1g;1s [7 Jan 2017]
                     1 Family †Ophiacodontidae Nopsca, 1923
                    Count: [†*] †1g;1s
                     2 Family †Eothyrididae Romer & Price, 1940
                    Count: -