Fishes
   Class Actinopterygii Woodward, 1891 - ray-finned fishes
     Order Anguilliformes Rafinesque, 1810 - eels
       01 Family Anguillidae Rafinesque, 1815 - freshwater eels
       02 Family Heterenchelyidae Regan, 1912
       03 Family Moringuidae Gill, 1885 - spaghetti eels
       04 Family Chlopsidae Rafinesque, 1815 - false morays
       05 Family Myrocongridae Gill, 1890
       06 Family Muraenidae Rafinesque, 1815 - morays
       07 Family Synaphobranchidae Johnson, 1862 - cutthroat eels
       08 Family Ophichthidae Günther, 1870 - snake eels and worm eels
       09 Family Colocongridae Smith, 1976
       10 Family Congridae Kaup, 1856 - conger eels
       11 Family Muraenesocidae Kaup, 1859 - pike conger eels
       12 Family Derichthyidae - longneck eels
       13 Family Nemichthyidae Kaup, 1859 - snipe eels
       14 Family Serrivomeridae Trewavas, 1932 - sawtooth eels
       15 Family Nettastomatidae Kaup, 1859 - duckbill eels