Infraphylum [Gnathostomata] Gegenbaur, 1874 - jawed vertebrates see Superclass Gnathostomata Gegenbaur, 1874
   Megaclass Osteichthyes Huxley, 1880 see Clade Osteichthyes Huxley 1880 [Moore & Near 2020]
     Superclass Actinopterygii Woodward, 1891 see Clade Actinopterygii Woodward 1891 [Moore & Near 2020]
       Class Actinopteri Cope, 1871
         Subclass Neopterygii Regan, 1923
           Infraclass Teleostei Müller, 1845 see Division Teleostei Müller, 1845
             Megacohort Elopocephalai Betancur-R et al., 2017 [monotypic]
               Cohort Elopomorpha Greenwood et al., 1966
                 Order Notacanthiformes Goodrich, 1909 - halosaurs and deep-sea spiny eels
                   1 Family Halosauridae Günther, 1868 - halosaurs
                   2 Family Notacanthidae Rafinesque, 1810 - deepsea spiny eels