[Subphylum Vertebrata Cuvier, 1812 - vertebrates] see Infraphylum Vertebrata Lamarck, 1801
   [Superclass Homotherma]
   [Ichnoclass †Ichnites - trace fossils]
   [Superclass Reptilia Linnaeus, 1758]
   2 [Class Cyclostomata Richards]
   3.1 [[stem] Superclass †Conodonta Eichenberg, 1930 [monotypic] - conodonts] see Class Conodonta Eichenberg, 1930
   3.2.2 [Clade Myopterygii Janvier, 1978 - myopterygians]
   3.2.2.4.0 [Infraphylum Gnathostomata Gegenbaur, 1874 - jawed vertebrates] see Superclass Gnathostomata Gegenbaur, 1874
   3.2.2.4.2.0 [Class Elasmobranchiomorphi] see Infraphylum Gnathostomata Gegenbaur, 1874
   3.2.2.4.5.2 [Cohort Amniota Haeckel, 1866] see Clade Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988], nom. cl. inval.
   3.2.2.4.5.2.2 [Class †Dinosauria Owen, 1841 [paraphyletic]] see Clade Dinosauria Owen 1842 [Langer, Novas, Bittencourt, Ezcurra & Gauthier 2020]
   n.0 [Class Agnatha Cope, 1889 [paraphyletic]]
   n.0 [Superclass Agnatha Haeckel, 1895] see Class Agnatha Cope, 1889
   n.0 [Infraphylum Agnatha auct.] see Class Agnatha Cope, 1889