Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
           Class Reptilia Linnaeus, 1758 [paraphyletic] - reptiles
             Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
               Infraclass Archosauromorpha Huene, 1946 see Clade Archosauromorpha Huene 1946 [Benton 1985], nom. cl. inval.
                 Superorder Archosauria Cope, 1869 - archosaurs see Clade Archosauria Cope 1869 [Gauthier & Padian 1985], nom. cl. inval.
                   Order Crocodylia Wagler, 1830 - crocodiles
                     Suborder Eosuchia Carroll, 1988, orth. inval. see Suborder Eusuchia Huxley, 1875
                       Family Alligatoridae Cuvier, 1807
                         01 Genus †Akanthosuchus O'Neill, Lucas & Kues, 1981
                         02 Genus Alligator Cuvier, 1817
                         03 Genus †Allognathosuchus Mook, 1921
                         04 Genus †Balanerodus Langston, 1965, nom. dub.
                         05 Genus Caiman Spix, 1825
                         06 Genus †Ceratosuchus Schmidt, 1938
                         07 Genus †Diplocynodon Pomel, 1847
                         08 Genus †Eoalligator Young, 1964
                         09 Genus †Hispanochampsa Kälin, 1936 see Genus Diplocynodon Pomel, 1847
                         10 Genus Melanosuchus Gray, 1862
                         11 Genus Paleosuchus Gray, 1862
                         12 Genus †Procaimanoidea Gilmore, 1946
                         13 ?Genus †Prodiplocynodon Mook, 1941
                         14 Genus †Wannangosuchus Carroll, 1988, orth. inval. see Genus Wannaganosuchus Erickson, 1982