Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Craniata Linnaeus, 1758 see Subphylum Vertebrata Cuvier, 1812
     Pisces
       Class Actinopterygii Woodward, 1891 - ray-finned fishes
         Order Ophidiiformes Rafinesque, 1810 - cusk-eels
           1 Family Ophidiidae Jordan & Evermann, 1898 - cuskeels
           2 Family Carapidae Jordan & Fowler, 1902 - pearlfishes
           3 Family Bythitidae Gill, 1861 - livebearing brotulas
           4 Family Aphyonidae - aphyonids
           5 Family Parabrotulidae - false brotulas