Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Pisces
       Class Actinopterygii Woodward, 1891 - ray-finned fishes
         Order Ophidiiformes Rafinesque, 1810 - cusk-eels
           Family Aphyonidae - aphyonids
           Family Bythitidae Gill, 1861 - livebearing brotulas
           Family Carapidae Jordan & Fowler, 1902 - pearlfishes
           Family Ophidiidae Jordan & Evermann, 1898 - cuskeels