Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   Gnathostomata
     Teleostomi Bonaparte, 1836
       Class Osteichthyes Huxley, 1880 [paraphyletic] - bony fishes and tetrapods see Clade Osteichthyes Huxley 1880 [Moore & Near 2020]
         Subclass Actinopterygii Woodward, 1891 - ray-finned fishes see Class Actinopterygii Woodward, 1891
           Infraclass Neopterygii Regan, 1923 see Subclass Neopterygii Regan, 1923
             Division Teleostei Müller, 1845
               Subdivision Euteleostei Greenwood et al., 1966 see Cohort Euteleostei Greenwood et al., 1966
                 Superorder Acanthopterygii Rosen & Patterson, 1969 see Division Acanthopterygii Rosen & Patterson, 1969
                   Series Atherinomorpha Greenwood et al., 1966 see Infraseries Atherinomorpha
                     Order Cyprinodontiformes Berg, 1940 - killifishes
                       Suborder Cyprinodontoidea see Suborder Cyprinodontoidei
                         1 Family Oryziatidae see Subfamily Oryziinae Myers, 1938
                         2 Family Adrianichthyidae Weber, 1913 - adrianichthyids
                         3 Family Horaichthyidae C.V. Kulkarni, 1940 see Subfamily Horaichthyinae Kulkarni, 1940
                         4 Family Cyprinodontidae Wagner, 1828 - killifishes
                         5 Family Goodeidae Jordan & Gilbert, 1883 - splitfins
                         6 Family Anablepidae Bonaparte, 1831 - four-eyed fishes and onesided livebearers
                         7 Family Nynsiidae Carroll, 1988, nom. null. see Family Jenynsiidae Günther, 1866
                         8 Family Poeciliidae Bonaparte, 1831 - poeciliids