[Neosuchia] Benton & Clark 1988 [Sereno, Larsson, Sidor & Gado 2001]
   Eusuchia Huxley 1875 {Brochu 2003}
     Crocodylia Gmelin 1789 [Clark 1988] see Order Crocodylia Wagler, 1830
       Brevirostres von Zittel 1890 [Brochu 2003]
         Alligatoroidea Gray 1844 {Brochu 2003} see Superfamily Alligatoroidea Cuvier, 1807
           Genus Alligator Cuvier, 1817
             1.1.1.1 Alligator sinensis Fauvel, 1879 - Chinese alligator
             1.1.1.2.1 Alligator mississippiensis (Daudin, 1802), sedis mutabilis - American alligator
             1.1.1.2.2 †Alligator mefferdi Mook, 1946, sedis mutabilis
             1.1.1.2.3 †Alligator thomsoni Mook, 1923, sedis mutabilis
             1.1.2 †Alligator olseni White, 1942
             1.2 †Alligator mcgrewi Schmidt, 1941
             2 †Alligator prenasalis (Loomis, 1904)