Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
     Pisces
       Class Actinopterygii Woodward, 1891 - ray-finned fishes see Clade Actinopterygii Woodward 1891 [Moore & Near 2020]
         Order Cyprinodontiformes Berg, 1940 - killifishes
           Family Anablepidae Bonaparte, 1831 - four-eyed fishes and onesided livebearers
           Family Aplocheilidae Bleeker, 1859 - Old World rivulins
           Family Cyprinodontidae Wagner, 1828 - killifishes
           Family Goodeidae Jordan & Gilbert, 1883 - splitfins
           Family Poeciliidae Bonaparte, 1831 - poeciliids