Pisces
   Class Actinopterygii Woodward, 1891 - ray-finned fishes
     Order Ophidiiformes Rafinesque, 1810 - cusk-eels
       1 Family Ophidiidae Jordan & Evermann, 1898 - cuskeels
       2 Family Carapidae
       3 Family Bythitidae - livebearing brotulas
       4 Family Aphyonidae - aphyonids
       5 Family Parabrotulidae - false brotulas