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
           01 Family Aplocheilidae Bleeker, 1860 - killifishes
           02 Family Nothobranchiidae
           03 Family Rivulidae Hoedemann, 1962 - rivulines
           04 Family Profundulidae
           05 Family Fundulidae Jordan & Gilbert, 1882 - topminnows and killifishes
           06 Family Valenciidae
           07 Family Goodeidae Jordan, 1923 - goodeids
           08 Family Poeciliidae Garman, 1895 - live-bearers
           09 Family Cyprinodontidae Gill, 1865 - pupfishes
           10 Family Anablepidae Garman, 1895 - four-eyed fish