living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Osteichthyes Huxley, 1880 - bony fishes see [unranked] Euteleostomi
               Subclass Actinopterygii Woodward, 1891 - ray-finned fishes see Class Actinopterygii Woodward, 1891
                 Order Atheriniformes Rosen, 1964 - silversides
                   Suborder Cyprinodontoidei
                     Family Cyprinodontidae Gill, 1865 - pupfishes
                       1 Genus Aphyosemion Myers, 1924
                       2 Genus Crenichthys Hubbs, 1932
                       3 Genus Cyprinodon Lacépède, 1803
                       4 Genus Fundulus Lacépède, 1803
                       5 Genus Rivulus Poey, 1860