[Phylum] Chordata Bateson, 1885 - chordates
   Subphylum Craniata auct.
     Infraphylum Vertebrata Lamarck, 1801 - vertebrates
       Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
         Class Osteichthyes Huxley, 1880 - bony fishes and tetrapods see Clade Osteichthyes Huxley 1880 [Moore & Near 2020]
           Subclass Actinopterygii Woodward, 1891 - ray-finned fishes see Class Actinopterygii Woodward, 1891
             Infraclass Actinopteri Cope, 1871 see Class Actinopteri Cope, 1871
               Superdivision Neopterygii Regan, 1923 see Subclass Neopterygii Regan, 1923
                 Superdivision Teleosteomorpha Arratia, 2001 see Infraclass Teleosteomorpha Arratia, 2001
                   Division Teleostei Müller, 1845
                     Cohort Elopomorpha Greenwood et al., 1966
                       Order Anguilliformes Berg, 1943 - eels
                         01 Family †Anguillavidae Hay, 1903
                         02 Family †Georgidentidae Sytchevskaya & Prokofiev, 2004
                         03 Family †Libanechelyidae Taverne, 2004
                         04 Family †Milananguillidae Blot, 1978
                         05 Family †Urenchelyidae Jordan, 1905
                         06 Suborder Protanguilloidei [monotypic] see Suborder Synaphobranchoidei
                         07 Suborder Synaphobranchoidei [monotypic]
                         08 Suborder Moringuoidei [monotypic] see Suborder Anguilloidei
                         09 Suborder Anguilloidei
                         10 Suborder Muraenoidei
                         11 Suborder Chlopsoidei [monotypic]
                         12 Suborder Congroidei Regan, 1909
                         13 Suborder Saccopharyngoidei see Suborder Anguilloidei