Pisces
   Class Actinopterygii Woodward, 1891 - ray-finned fishes
     Order Anguilliformes Rafinesque, 1810 - eels
       01 Family Anguillidae Rafinesque, 1815 - freshwater eels
       02 Family Heterenchelyidae
       03 Family Moringuidae - spaghetti eels
       04 Family Chlopsidae Rafinesque, 1815 - false morays
       05 Family Myrocongridae
       06 Family Muraenidae Rafinesque, 1815 - morays
       07 Family Synaphobranchidae - cutthroat eels
       08 Family Ophichthidae - snake eels and worm eels
       09 Family Colocongridae
       10 Family Congridae - conger eels
       11 Family Muraenesocidae - pike conger eels
       12 Family Derichthyidae - longneck eels
       13 Family Nemichthyidae - snipe eels
       14 Family Serrivomeridae - sawtooth eels
       15 Family Nettastomatidae - duckbill eels