Archosauromorpha Huene 1946 [Benton 1985], nom. cl. inval. see Clade Archosauromorpha von Huene 1946 [Gauthier 2020]
   Archosauriformes Gauthier 1994, nom. cl. inval. see Clade Archosauriformes Gauthier 1994 [Gauthier 2020]
     Crurotarsi Sereno & Arcucci 1990
       Archosauria Cope 1869 [Gauthier & Padian 1985], nom. cl. inval. see Clade Archosauria Cope 1869 [Gauthier & Padian 2020]
         Pseudosuchia Zittel 1887-1890 [Gauthier & Padian 1985]
           Suchia Krebs 1974 [Sereno 1991]
             Paracrocodylomorpha Parrish 1993
               Loricata Merrem 1820 [Nesbitt 2011]
                 Crocodylomorpha Walker 1968 [Clark 1988] see Subclass Crocodylomorpha Hay, 1930
                   Crocodyliformes Clark 1988 [Sereno, Larsson, Sidor & Gado 2001]
                     Genus Alligator Cuvier, 1817, sedis mutabilis
                       Alligator mississippiensis (Daudin, 1802), sedis mutabilis - American alligator