Vertebrata Cuvier, 1812 - vertebrates
Ref: R.L. Carroll, 1988: fig. 1.3 [indirect position]; Count: [f†f] 7c;100o;734f; ‡2o;8f; †2c;109o;819f;10g [22 Aug 2017]
   Gnathostomata
  Ref: R.L. Carroll, 1988: fig. 1.3; Count: [f†f] 6c;98o;732f; ‡2o;8f; †2c;104o;782f;9g [22 Aug 2017]
     Teleostomi
    Ref: R.L. Carroll, 1988: fig. 1.3; Count: [f†f] 5c;94o;691f; ‡2o;8f; †1c;82o;712f;7g [22 Aug 2017]
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
      Ref: R.L. Carroll, 1988: fig. 1.3; Count: [f†f] 4c;54o;292f; ‡2o;8f; †56o;574f;3g [22 Aug 2017]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
        Ref: R.L. Carroll, 1988: fig. 1.3; Count: [f†f] 3c;51o;265f; ‡2o;8f; †48o;494f;3g [22 Aug 2017]
           Class Reptilia Linnaeus, 1758 [paraphyletic] - reptiles
          Ref: R.L. Carroll, 1988: 615; Count: [f†f] 4o;48f; †19o;242f;2g [29 Jul 2017]
             Subclass Anapsida Osborn, 1903 - anapsids
            Ref: R.L. Carroll, 1988: 615; Count: [†f] †2o;12f;1g [25 Jul 2017]
               Order †Captorhinida
              Ref: R.L. Carroll, 1988: 615; Count: [†f] †11f [5 Jul 2017]
                 Suborder †Procolophonia Seeley, 1888 [monotypic] see Clade Procolophonia Seeley 1888 [Laurin & Reisz 1995]
                Ref: R.L. Carroll, 1988: 615; Count: [†*] †3f;32g [30 Aug 2019]
                   1 Superfamily †Procolophonoidea Cope, 1889
                  Ref: R.L. Carroll, 1988: 615; Count: [†*] †3f;32g [30 Aug 2019]