Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Reptilia Linnaeus, 1758 - reptiles
               Subclass Lepidosauria Duméril & Bibron, 1839
                 Order Squamata Oppel, 1811
                   Suborder Serpentes Linnaeus, 1758 - snakes
                     Infraorder Caenophidia Hoffstetter, 1939 see Superfamily Xenophidia
                       Family Crotalidae Oppel, 1811 see Subfamily Crotalinae Oppel, 1811
                         Genus Agkistrodon de Beauvois, 1799
                         Genus Bothrops Wagler, 1824
                         Genus Crotalus Linnaeus, 1758
                         Genus Lachesis Daudin, 1803
                         Genus Sistrurus Garman, 1883
                         Genus Trimeresurus Lacepède, 1804