Superphylum Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Craniata auct. see Subphylum Vertebrata Cuvier, 1812
       Vertebrata (Lamarck, 1801) - vertebrates see Subphylum Vertebrata Cuvier, 1812
         Myopterygii - myopterygians
           Superclass Gnathostomata Gegenbaur, 1874 - jawed vertebrates
             Grade Teleostomi Bonaparte, 1836
               Euteleostomi - bony vertebrates
                 Class Actinopterygii Woodward, 1891 - ray-finned fishes
                   Subclass Neopterygii Regan, 1923
                     Division Teleostei Müller, 1845 see Infraclass Teleostei Müller, 1845
                       Elopocephala see Supercohort Teleocephala de Pinna, 1996
                         Subdivision Elopomorpha Greenwood et al., 1966 see Cohort Elopomorpha Greenwood et al., 1966
                           Order Anguilliformes Rafinesque, 1810 - eels
                             Suborder Congroidei (Regan, 1909)
                               Family Ophichthidae Günther, 1870 - snake eels and worm eels
                                 Subfamily Ophichthinae
                                   01 Genus Apterichtus Duméril, 1806
                                   02 Genus Cirricaecula Schultz, in Schultz et al., 1953
                                   03 Genus Ichthyapus Brisout de Barneville, 1847
                                   04 Genus Bascanichthys Jordan & Davis, 1892
                                   05 Genus Caecula Vahl, 1794
                                   06 Genus Callechelys Kaup, 1856
                                   07 Genus Cirrhimuraena Kaup, 1856
                                   08 Genus Dalophis Rafinesque, 1810
                                   09 Genus Echelus Rafinesque, 1810
                                   10 Genus Echiophis Kaup, 1856
                                   11 Genus Ethadophis Rosenblatt & McCosker, 1970
                                   12 Genus Lamnostoma Kaup, 1856
                                   13 Genus Letharchus Goode & Bean, 1882
                                   14 Genus Myrichthys Girard, 1859
                                   15 Genus Mystriophis Kaup, 1856
                                   16 Genus Ophichthus Ahl, 1789
                                   17 Genus Phaenomonas Myers & Wade, 1941
                                   18 Genus Pisodonophis Kaup, 1856
                                   19 Genus Yirrkala Whitley, 1940