living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
             Class Osteichthyes Huxley, 1880 - bony fishes and tetrapods see Clade Osteichthyes Huxley 1880 [Moore & Near 2020]
               Subclass Actinopterygii Woodward, 1891 - ray-finned fishes see Class Actinopterygii Woodward, 1891
                 Order Gadiformes Goodrich, 1909 - cods and hakes
                   Suborder Ophidioidei Regan, 1912
                     Family Ophidiidae Rafinesque, 1810 - cusk-eels
                       1 Subfamily Ophidiinae Rafinesque, 1810 - true cusk-eels
                       2 Subfamily Brotulinae Swainson, 1838 see Family Brotulidae Swainson, 1838
                       3 Genus Lucifuga Poey, 1858
                       4 Genus Brotula Cuvier, 1829
                       5 Genus Genypterus Philippi, 1857
                       6 Genus Lepophidium Gill, 1895
                       7 Genus Ophidion Linnaeus, 1758
                       8 Genus Otophidium Gill, 1885