Phylum [Vertebrata] (Lamarck, 1801)
Count: -
   Class Reptilia Linnaeus, 1758 - reptiles
  Count: 4o6f1g; †20o115f227g
     Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903
    Count: [*] †2o21f23g
       Order †Pelycosauria Cope, 1878 - pelycosaurs
      Count: [*] †5f7g
         1 Family †Ophiacodontidae Nopsca, 1923
        Count: -
         2 Family †Caseidae Williston, 1912
        Count: -
         3 Family †Edaphosauridae Cope, 1882
        Count: -
         4 Family †Sphenacodontidae Marsh, 1878
        Count: -
         5 Family †uncertain
        Count: [*] †1g