Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Craniata Linnaeus, 1758 see Subphylum Vertebrata Cuvier, 1812
     Pisces
       Class Actinopterygii Woodward, 1891 - ray-finned fishes
         Order Cyprinodontiformes Berg, 1940 - killifishes
           Family Aplocheilidae Bleeker, 1860 - killifishes
           Family Nothobranchiidae
           Family Rivulidae Hoedemann, 1962 - rivulines
           Family Profundulidae
           Family Valenciidae
           Family Goodeidae Jordan, 1923 - goodeids
           Family Poeciliidae Garman, 1895 - live-bearers
           Family Cyprinodontidae Gill, 1865 - pupfishes
           Family Anablepidae Garman, 1895 - four-eyed fish
           Family Fundulidae Jordan & Gilbert, 1882 - topminnows and killifishes