Fishes
   Class Actinopterygii Woodward, 1891 - ray-finned fishes
     Order Cyprinodontiformes Berg, 1940 - killifishes
       1 Family Aplocheilidae Bleeker, 1860 - killifishes
       2 Family Profundulidae
       3 Family Fundulidae Jordan & Gilbert, 1882 - topminnows and killifishes
       4 Family Valenciidae
       5 Family Goodeidae Jordan, 1923 - goodeids
       6 Family Poeciliidae Garman, 1895 - live-bearers
       7 Family Cyprinodontidae Gill, 1865 - pupfishes
       8 Family Anablepidae Garman, 1895 - four-eyed fish