Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
     Pisces
       Class Actinopterygii Woodward, 1891 - ray-finned fishes see Clade Actinopterygii Woodward 1891 [Moore & Near 2020]
         Order Anguilliformes Berg, 1943 - eels
           Family †Anguillavidae Hay, 1903
           Family Anguillidae Rafinesque, 1810 - freshwater eels
           Family †Anguilloididae Blot, 1978
           Family Chlopsidae Rafinesque, 1815 - false morays
           Family Colocongridae Smith, 1976 - shorttail eels
           Family Congridae Kaup, 1856 - conger eels
           Family Derichthyidae Gill, 1884 - longneck eels
           Family Heterenchelyidae Regan, 1912 - mud eels
           Family †Milananguillidae Blot, 1978
           Family Moringuidae Gill, 1885 - spaghetti eels
           Family Muraenesocidae Kaup, 1859 - pike conger eels
           Family Muraenidae Rafinesque, 1815 - moray eels
           Family Myrocongridae Gill, 1890 - myroconger eels
           Family Nemichthyidae Kaup, 1859 - snipe eels
           Family Nettastomatidae Kaup, 1859 - duckbill eels
           Family Ophichthidae Günther, 1870 - snake eels and worm eels
           Family †Paranguillidae Blot, 1981
           Family †Patavichthidae see Family Patavichthyidae Blot, 1981
           Family †Proteomyridae Blot, 1981
           Family Serrivomeridae Trewavas, 1932 - sawtooth eels
           Family Synaphobranchidae Johnson, 1862 - cutthroat eels
           Family †Urenchelyidae Jordan, 1905