| Nominal Species (n = 548) | Present allocation (n = 346) | Ref. |
|---|---|---|
| Anguilla acuminata Swainson, 1839 | Pisodonophis boro | 94476 |
| Muraena acuminata Gronow, 1854 | Myrichthys breviceps | 3814 |
| Aotea acus Phillipps, 1926 | Scolecenchelys breviceps | 56887 |
| Sphagebranchus acuticeps Barnard, 1923 | Ichthyapus acuticeps | 3972 |
| Ichthyapus acutirostris Brisout de Barneville, 1847 | Ichthyapus acutirostris | 87265 |
| Muraena acutirostris Gronow, 1854 | Ophisurus serpens | 4455 |
| Muraenichthys acutirostris Weber & de Beaufort, 1916 | Scolecenchelys acutirostris | 39782 |
| Ophichthys adspersus Günther, 1870 | Brachysomophis porphyreus | 42180 |
| Myrichthys aki Tanaka, 1917 | Myrichthys maculosus | 40867 |
| Ethadophis akkistikos McCosker & Böhlke, 1984 | Ethadophis akkistikos | 26282 |
| Ophichthys algoensis Barnard, 1925 | Ophichthus unicolor | 3972 |
| Letharchus aliculatus McCosker, 1974 | Letharchus aliculatus | 31241 |
| Ophichthus alleni McCosker, 2010 | Ophichthus alleni | 84366 |
| Ophisurus alternans Quoy & Gaimard, 1824 | Myrichthys colubrinus | 27116 |
| Microdonophis altipennis Kaup, 1856 | Ophichthus altipennis | 26282 |
| Ophichthys amboinensis Bleeker, 1864 | Ophichthus celebicus | 27116 |
| Neenchelys andamanensis Hibino, Satapoomin & Kimura, 2015 | Neenchelys andamanensis | 106111 |
| Lethogoleos andersoni McCosker & Böhlke, 1982 | Lethogoleos andersoni | 27116 |
| Ophichthys anguiformis Peters, 1877 | Apterichtus anguiformis | 101270 |
| Ophichthus aniptocheilos McCosker, 2010 | Ophichthus aniptocheilos | 84366 |
| Muraena annulata Ahl, 1789 | Myrichthys colubrinus | 27116 |
| Verma ansp Böhlke, 1968 | Apterichtus ansp | 101270 |
| Myrophis anterodorsalis McCosker, Böhlke & Böhlke, 1989 | Myrophis anterodorsalis | 26282 |
| Muraenichthys aoki Jordan & Snyder, 1901 | Scolecenchelys aoki | 40863 |
| Ophichthus apachus McCosker & Rosenblatt, 1998 | Ophichthus apachus | 31243 |
| Ophichthus aphotistos McCosker & Chen, 2000 | Ophichthus aphotistos | 40865 |
| Ophisurus apicalis Anonymous [Bennett], 1830 | Ophichthus apicalis | 3972 |
| Caecula apterygia Vahl, 1794 | Apterichtus caecus | 6564 |
| Ophichthys arenicola Klunzinger, 1871 | Cirrhimuraena playfairii | 26282 |
| Ophichthus arneutes McCosker & Rosenblatt, 1998 | Ophichthus arneutes | 31243 |
| Ophichthus asakusae Jordan & Snyder, 1901 | Ophichthus asakusae | 559 |
| Ophichthys ascensionis Studer, 1889 | Quassiremus ascensionis | 26282 |
| Myrichthys aspetocheiros McCosker & Rosenblatt, 1993 | Myrichthys aspetocheiros | 9328 |
| Pisodonophis assamensis Sen, 1986 | Pisodonophis boro | 4832 |
| Ophichthys ater Peters, 1866 | Ophichthus remiger | 31243 |
| Brachysomophis atlanticus Blache & Saldanha, 1972 | Brachysomophis atlanticus | 4455 |
| Pseudomyrophis atlanticus Blache, 1975 | Pseudomyrophis atlanticus | 4455 |
| Apterichtus australis McCosker & Randall, 2005 | Apterichtus australis | 75631 |
| Muraenichthys australis Macleay, 1881 | Scolecenchelys australis | 7300 |
| Ophisurus baccidens (non Cantor, 1849) | Pisodonophis boro | 94476 |
| Ophisurus baccidens Cantor, 1849 | Pisodonophis cancrivorus | 94476 |
| Ophisurus bangko Bleeker, 1852 | Ophichthus apicalis | 94476 |
| Caecula bascanium Jordan, 1884 | Bascanichthys bascanium | 56401 |
| Bascanichthys bascanoides Osburn & Nichols, 1916 | Bascanichthys bascanoides | 9328 |
| Ophichthus bennettai McCosker, 1986 | Ophichthus serpentinus | 11228 |
| Ophichthus bicolor McCosker & Ho, 2015 | Ophichthus bicolor | 106143 |
| Callechelys bilinearis Kanazawa, 1952 | Callechelys bilinearis | 27478 |
| Dalophis bimaculata Rafinesque, 1810 | Dalophis imberbis | 6564 |
| Ophichthys biserialis Garman, 1899 | Ophichthus rugifer | 31243 |
| Ophichthys bitaeniatus Peters, 1877 | Callechelys bitaeniata | 27478 |
| Mystriophis blastorhinos Kanazawa, 1963 | Kertomichthys blastorhinos | 27116 |
| Myrichthys bleekeri Gosline, 1951 | Myrichthys colubrinus | 75154 |
| Ophichthys bleekeri Volz, 1903 | Ophichthus polyophthalmus | 94476 |
| Poecilocephalus bonaparti Kaup, 1856 | Ophichthus bonaparti | 3972 |
| Muraenichthys borealis Machida & Shiogaki, 1990 | Scolecenchelys aoki | 92899 |
| Ophisurus boro Hamilton, 1822 | Pisodonophis boro | 3972 |
| Caecula boulengeri Blache, Cadenat & Stauch, 1970 | Dalophis boulengeri | 4455 |
| Uranichthys brachycephalus Poey, 1867 | Ophichthus ophis | 4455 |
| Ophichthus brachynotopterus Karrer, 1983 | Ophichthus brachynotopterus | 40865 |
| Ophisurus brachysoma (non Bleeker, 1853) | Pisodonophis boro | 94476 |
| Ophisurus brachysoma Bleeker, 1853 | Pisodonophis cancrivorus | 94476 |
| Ophichthys brachyurus Poey, 1868 | Ophichthus gomesii | 26282 |
| Caecilia branderiana Lacepède, 1800 | Apterichtus caecus | 6564 |
| Centrurophis brasiliensis Kaup, 1856 | Ophichthus brasiliensis | 26282 |
| Scolecenchelys brevicaudata Hibino & Kimura, 2015 | Scolecenchelys brevicaudata | 104540 |
| Ophichthus brevicaudatus Chu, Wu & Jin, 1981 | Ophichthus brevicaudatus | 46206 |
| Muraenichthys breviceps Günther, 1876 | Scolecenchelys breviceps | 56887 |
| Ophisurus breviceps Richardson, 1848 | Myrichthys breviceps | 26282 |
| Muraenichthys breviceps halituna Whitley, 1955 | Scolecenchelys breviceps | 56887 |
| Ophichthus brevidorsalis Chiu & Hibino, 2019 | Ophichthus brevidorsalis | 121619 |
| Ophichthus brevirostris McCosker & Ross, 2007 | Ophichthus brevirostris | 75745 |
| Ophisurus broekmeyeri Bleeker, 1856 | Ophichthus celebicus | 27116 |
| Notophtophis brunneus Castro-Aguirre & Suárez de los Cobos, 1983 | Echiophis brunneus | 26282 |
| Ophichthys buettikoferi Steindachner, 1894 | Dalophis cephalopeltis | 2846 |
| Neenchelys buitendijki Weber & de Beaufort, 1916 | Neenchelys buitendijki | 7245 |
| Ethadophis byrnei Rosenblatt & McCosker, 1970 | Ethadophis byrnei | 9328 |
| Muraena caeca Linnaeus, 1758 | Apterichtus caecus | 4455 |
| Ophichthys calamus Günther, 1870 | Cirrhimuraena calamus | 7300 |
| Ophisurus californiensis Garrett, 1863 | Ophichthus triserialis | 31243 |
| Herpetoichthys callisoma Abbott, 1860 | Ophichthus ophis | 4455 |
| Yirrkala calyptra McCosker, 2011 | Yirrkala calyptra | 86861 |
| Chauligenion camelopardalis McCosker & Okamoto, 2016 | Chauligenion camelopardalis | 129451 |
| Callechelys canaliculatus Smith, 1958 | Callechelys bitaeniata | 27478 |
| Ophisurus cancrivorus Richardson, 1848 | Pisodonophis cancrivorus | 33390 |
| Leptorhynchus capensis Smith, 1840 | Ophisurus serpens | 3972 |
| Benthenchelys cartieri Fowler, 1934 | Benthenchelys cartieri | 39782 |
| Benthenchelys cartieri indicus Castle, 1972 | Benthenchelys indicus | 46206 |
| Benthenchelys cartieri pacificus Castle, 1972 | Benthenchelys pacificus | 46206 |
| Scolecenchelys castlei McCosker, 2006 | Scolecenchelys castlei | 56887 |
| Sphagebranchus catostomus Schneider, 1801 | Callechelys catostoma | 27478 |
| Ophisurus caudatus McClelland, 1844 | Pisodonophis boro | 94476 |
| Leptocephalus caudomaculatus Eigenmann & Kennedy, 1902 | Echiophis intertinctus | 26282 |
| Bascanichthys ceciliae Blache & Cadenat, 1971 | Bascanichthys ceciliae | 4455 |
| Ophisurus celebicus Bleeker, 1856 | Ophichthus celebicus | 26282 |
| Sphagebranchus cephalopeltis (non Bleeker, 1863) | Dalophis boulengeri | 4455 |
| Sphagebranchus cephalopeltis Bleeker, 1863 | Dalophis cephalopeltis | 2846 |
| Ophichthus cephalozona Bleeker, 1864 | Ophichthus cephalozona | 1602 |
| Ophichthus chamensis Meek & Hildebrand, 1923 | Ophichthus zophochir | 31243 |
| Yirrkala chaselingi Whitley, 1940 | Yirrkala chaselingi | 39782 |
| Aplatophis chauliodus Böhlke, 1956 | Aplatophis chauliodus | 5217 |
| Ophisurus cheilopogon Bleeker, 1860 | Cirrhimuraena cheilopogon | 6993 |
| Myrophis cheni Chen & Weng, 1967 | Neenchelys cheni | 13269 |
| Muraenichthys chilensis McCosker, 1970 | Scolecenchelys chilensis | 13468 |
| Muraenichthys chilensis (non McCosker, 1970) | Scolecenchelys profundorum | 104540 |
| Ophichthus chilkensis Chaudhuri, 1916 | Ophichthus chilkensis | 130619 |
| Cirrhimuraena chinensis Kaup, 1856 | Cirrhimuraena chinensis | 6993 |
| Xyrias chioui McCosker, Chen & Chen, 2009 | Xyrias chioui | 82686 |
| Myrophis chrysogaster Macleay, 1881 | Pisodonophis cancrivorus | 7300 |
| Ophisurus chrysops Poey, 1860 | Ophichthus gomesii | 26282 |
| Sphagebranchus cinctus Tanaka, 1908 | Leiuranus semicinctus | 93002 |
| Ophisurus cirrocheilos Bleeker, 1857 | Brachysomophis cirrocheilos | 42180 |
| Ophichthys cirrochilus Günther, 1870 | Brachysomophis cirrocheilos | 42180 |
| Callechelys cliffi Böhlke & Briggs, 1954 | Callechelys cliffi | 27478 |
| Muraena colubrina Boddaert, 1781 | Myrichthys colubrinus | 3972 |
| Gordiichthys combibus McCosker & Lavenberg, 2001 | Gordiichthys combibus | 43688 |
| Ophisurus compar Richardson, 1848 | Ophichthus apicalis | 94476 |
| Allips concolor McCosker, 1972 | Allips concolor | 94170 |
| Leptocephalus conger Eigenmann, 1902 | Ophichthus cruentifer | 26282 |
| Bascanichthys congoensis Blache & Cadenat, 1971 | Bascanichthys paulensis | 4455 |
| Ophichthus congroides McCosker, 2010 | Ophichthus congroides | 84366 |
| Sphagebranchus conklini Eigenmann, 1916 | Ichthyapus ophioneus | 26282 |
| Muraenichthys cookei Fowler, 1928 | Scolecenchelys cookei | 40863 |
| Phaenomonas cooperae Palmer, 1970 | Phaenomonas cooperae | 3972 |
| Pisodonophis copelandi Herre, 1953 | Pisodonophis copelandi | 29047 |
| Leptocephalus crenatus Strömman, 1896 | Ahlia egmontis | 26282 |
| Mystriophis creutzbergi Cadenat, 1956 | Echiophis punctifer | 54133 |
| Ophisurus crocodilinus Bennett, 1833 | Brachysomophis crocodilinus | 3972 |
| Mystriophis crosnieri Blache, 1971 | Mystriophis crosnieri | 4455 |
| Pisoodonophis cruentifer Goode & Bean, 1896 | Ophichthus cruentifer | 12965 |
| Ophichthus cyclorhinus Fraser-Brunner, 1934 | Leiuranus versicolor | 75154 |
| Bascanichthys cylindricus Meek & Hildebrand, 1923 | Bascanichthys cylindricus | 9328 |
| Conger cylindroideus Ranzani, 1839 | Ophichthus cylindroideus | 54133 |
| Neenchelys daedalus McCosker, 1982 | Neenchelys daedalus | 96531 |
| Pisodonophis daspilotus Gilbert, 1898 | Pisodonophis daspilotus | 9328 |
| Bascanichthys deraniyagalai Menon, 1961 | Bascanichthys deraniyagalai | 4832 |
| Ophichthus derbyensis Whitley, 1941 | Ophichthus rutidoderma | 58467 |
| Muraenichthys devisi Fowler, 1907 | Scolecenchelys breviceps | 7300 |
| Hyphalophis devius McCosker & Böhlke, 1982 | Hyphalophis devius | 27116 |
| Neenchelys diaphora Ho, McCosker & Smith, 2015 | Neenchelys diaphora | 96531 |
| Ophisurus dicellurus Richardson, 1845 | Ophichthus remiger | 31243 |
| Ophisurus diepenhorsti Bleeker, 1860 | Ophichthus apicalis | 94476 |
| Myrophis dolichorhynchus Parr, 1930 | Myrophis punctatus | 26282 |
| Ophichthys dromicus Günther, 1870 | Myrichthys maculosus | 40867 |
| Apterichtus dunalailai McCosker & Hibino, 2015 | Apterichtus dunalailai | 101270 |
| Leptocephalus echeloides D'Ancona, 1928 | Ophichthus echeloides | 26282 |
| Myrophis egmontis Jordan, 1884 | Ahlia egmontis | 12965 |
| Chlevastes elaps Fowler, 1912 | Myrichthys colubrinus | 27116 |
| Ophichthys elapsoides Castelnau, 1875 | Myrichthys colubrinus | 75154 |
| Muraenichthys elerae Fowler, 1934 | Muraenichthys elerae | 27116 |
| Myrophis emmae Howell Rivero, 1934 | Myrophis platyrhynchus | 26282 |
| Microrhynchus epinepheli Blache & Bauchot, 1972 | Phaenomonas longissima | 94547 |
| Ophichthus episcopus Castelnau, 1878 | Ophichthus bonaparti | 75154 |
| Caecula equatorialis Myers & Wade, 1941 | Apterichtus equatorialis | 26282 |
| Microdonophis erabo Jordan & Snyder, 1901 | Ophichthus erabo | 3972 |
| Gordiichthys ergodes McCosker, Böhlke & Böhlke, 1989 | Gordiichthys ergodes | 26282 |
| Callechelys eristigma McCosker & Rosenblatt, 1972 | Callechelys eristigma | 27478 |
| Muraenichthys erythraeensis Bauchot & Maugé, 1980 | Scolecenchelys iredalei | 104540 |
| Ophichthus evermanni Jordan & Richardson, 1909 | Ophichthus lithinus | 75154 |
| Ophichthys exilis Seale, 1917 | Ophichthus remiger | 31243 |
| Ophichthus exourus McCosker, 1999 | Ophichthus exourus | 31795 |
| Muraena fasciata Ahl, 1789 | Myrichthys colubrinus | 27116 |
| Microdonophis fasciatus Chu, Wu & Jin, 1981 | Ophichthus fasciatus | 55073 |
| Ophisurus fasciatus Lacepède, 1802 | Myrichthys colubrinus | 26282 |
| Ophisurus fasciatus semicincta Bleeker, 1864 | Myrichthys colubrinus | 75154 |
| Callechelys fijiensis Seale, 1935 | Bascanichthys fijiensis | 26282 |
| Ophichthys filaria Günther, 1872 | Bascanichthys filaria | 27478 |
| Sphagebranchus flavicaudus Snyder, 1904 | Apterichtus flavicaudus | 26282 |
| Pterurus flexuosus Rafinesque, 1810 | Dalophis imberbis | 27116 |
| Sphagebranchus foresti Cadenat & Roux, 1964 | Phaenomonas longissima | 94080 |
| Pogonophis fossatus Myers & Wade, 1941 | Herpetoichthys fossatus | 26282 |
| Microdonophis fowleri Jordan & Evermann, 1903 | Ophichthus fowleri | 27116 |
| Muraenichthys fowleri Schultz, 1943 | Scolecenchelys gymnota | 40863 |
| Myrophis frio Jordan & Davis, 1891 | Pseudomyrophis frio | 27116 |
| Ophichthus frontalis Garman, 1899 | Ophichthus frontalis | 31243 |
| Hesperomyrus fryi Myers & Storey, 1939 | Myrophis vafer | 26282 |
| Pseudomyrophis fugesae McCosker, Böhlke & Böhlke, 1989 | Pseudomyrophis fugesae | 26282 |
| Muraena fusca Zuiew, 1793 | Yirrkala fusca | 46206 |
| Scolecenchelys fuscapenis McCosker, Ide & Endo, 2012 | Scolecenchelys fuscapenis | 90265 |
| Scolecenchelys fuscogularis Hibino, Kai & Kimura, 2013 | Scolecenchelys fuscogularis | 92890 |
| Bascanichthys gaira Moreno, Acero P. & Grijalba-Bendeck, 2016 | Bascanichthys gaira | 116651 |
| Callechelys galapagensis McCosker & Rosenblatt, 1972 | Callechelys galapagensis | 27478 |
| Ophichthus garretti Günther, 1910 | Ophichthus bonaparti | 54980 |
| Ophichthus genie McCosker, 1999 | Ophichthus genie | 31795 |
| Leptocephalus gilberti Eigenmann & Kennedy, 1902 | Bascanichthys bascanium | 26282 |
| Sphagebranchus gjellerupi Weber & de Beaufort, 1916 | Yirrkala gjellerupi | 27116 |
| Muraenichthys godeffroyi Regan, 1909 | Scolecenchelys godeffroyi | 39782 |
| Ophisurus gomesii Castelnau, 1855 | Ophichthus gomesii | 12965 |
| Quassiremus goslingi Beebe & Tee-Van, 1932 | Quassiremus ascensionis | 26282 |
| Neenchelys gracilis Ho & Loh, 2015 | Neenchelys gracilis | 106137 |
| Ophisurapus gracilis Kaup, 1856 | Apterichtus gracilis | 4455 |
| Ophichthys grandimaculata Kner & Steindachner, 1867 | Ophichthus triserialis | 31243 |
| Ophisurus grandoculis Cantor, 1849 | Ophichthus grandoculis | 27116 |
| Callechelys guichenoti Kaup, 1856 | Callechelys marmorata | 27478 |
| Ophichthys guineensis Osório, 1893 | Callechelys guineensis | 27478 |
| Ophichthys guineensis (non Osório, 1893) | Myrichthys pardalis | 27478 |
| Ophisurus guineensis Blache, 1975 | Xyrias guineensis | 4455 |
| Ophisurus guttatus Cuvier, 1816 | Ophichthus ophis | 26282 |
| Ophichthys guttifer Bean & Dresel, 1884 | Ophichthus puncticeps | 26282 |
| Pisodonophis guttulatus Kaup, 1856 | Myrichthys breviceps | 26282 |
| Caecula gymnocelus Böhlke, 1953 | Apterichtus equatorialis | 94664 |
| Muraena gymnopterus Bleeker, 1853 | Muraenichthys gymnopterus | 6128 |
| Muraenichthys gymnotus (non Bleeker, 1857) | Scolecenchelys aoki | 92899 |
| Muraenichthys gymnotus Bleeker, 1857 | Scolecenchelys gymnota | 1602 |
| Muraenichthys gymnotus (non Bleeker, 1857) | Scolecenchelys laticaudata | 104540 |
| Muraenichthys gymnotus (non Bleeker, 1857) | Scolecenchelys robusta | 104540 |
| Ophisurus harancha Hamilton, 1822 | Pisodonophis boro | 94476 |
| Apterichtus hatookai Hibino, Shibata & Kimura, 2014 | Apterichtus hatookai | 95408 |
| Muraenichthys hattae Jordan & Snyder, 1901 | Muraenichthys gymnopterus | 40863 |
| Muraena hauannensis Bloch & Schneider, 1801 | Ophichthus ophis | 4455 |
| Pylorobranchus hearstorum McCosker, 2014 | Pylorobranchus hearstorum | 95665 |
| Luthulenchelys heemstraorum McCosker, 2007 | Luthulenchelys heemstraorum | 58467 |
| Bascanichthys hemizona Ogilby, 1897 | Malvoliophis pinguis | 7300 |
| Brachysomophis henshawi Jordan & Snyder, 1904 | Brachysomophis henshawi | 42180 |
| Leptocephalus hexastigma Regan, 1916 | Ahlia egmontis | 26282 |
| Sphagebranchus heyningi Weber, 1913 | Hemerorhinus heyningi | 40911 |
| Ophisurus hijala Hamilton, 1822 | Pisodonophis hijala | 94476 |
| Ophichthus hirritus McCosker, 2010 | Ophichthus hirritus | 84366 |
| Ophisurus hispanus Bellotti, 1858 | Ophichthus rufus | 6564 |
| Ophisurus hoevenii Bleeker, 1853 | Pisodonophis hoevenii | 13710 |
| Pylorobranchus hoi McCosker, Loh, Lin & Chen, 2012 | Pylorobranchus hoi | 92848 |
| Cryptopterygium holochroma Ginsburg, 1951 | Callechelys springeri | 27478 |
| Brachysomophis horridus Kaup, 1856 | Brachysomophis crocodilinus | 42180 |
| Ophichthus humanni McCosker, 2010 | Ophichthus humanni | 84366 |
| Leptocephalus humilis Strömman, 1896 | Ahlia egmontis | 26282 |
| Sphagebranchus huysmani Weber, 1913 | Scolecenchelys gymnota | 40863 |
| Ophichthus hyposagmatus McCosker & Böhlke, 1984 | Ophichthus hyposagmatus | 27116 |
| Ophisurus hypselopterus Bleeker, 1851 | Pisodonophis hypselopterus | 6128 |
| Myrophis iguapensis Miranda Ribeiro, 1908 | Myrophis punctatus | 26282 |
| Sphagebranchus imberbis Delaroche, 1809 | Dalophis imberbis | 6564 |
| Anguilla immaculata Swainson, 1839 | Pisodonophis boro | 94476 |
| Jenkinsiella inhacae Smith, 1962 | Cirrhimuraena inhacae | 3972 |
| Bascanichthys inopinatus McCosker, Böhlke & Böhlke, 1989 | Bascanichthys inopinatus | 26282 |
| Yirrkala insolitus McCosker, 1999 | Yirrkala insolitus | 31795 |
| Ichthyapus insularis McCosker, 2004 | Ichthyapus insularis | 76875 |
| Ophisurus intertinctus Richardson, 1848 | Echiophis intertinctus | 1830 |
| Muraenichthys iredalei Whitley, 1927 | Scolecenchelys iredalei | 104540 |
| Gordiichthys irretitus Jordan & Davis, 1891 | Gordiichthys irretitus | 7251 |
| Ophichthus ishiyamorum McCosker, 2010 | Ophichthus ishiyamorum | 84366 |
| Muraenichthys japonicus Machida & Ohta, 1993 | Scolecenchelys aoki | 104540 |
| Apterichtus jeffwilliamsi McCosker & Hibino, 2015 | Apterichtus jeffwilliamsi | 101270 |
| Ophichthus johnmccoskeri Mohapatra, Ray, Mohanty & Mishra, 2018 | Ophichthus johnmccoskeri | 129615 |
| Cirricaecula johnsoni Schultz, 1953 | Cirricaecula johnsoni | 1602 |
| Muraenichthys johnstonensis Schultz & Woods, 1949 | Schultzidia johnstonensis | 26282 |
| Bascanichthys kabeyawan Hibino & Ho, 2022 | Bascanichthys kabeyawan | 127464 |
| Ophichthus kailashchandrai Mohapatra, Ray, Mohanty & Mishra, 2020 | Ophichthus kailashchandrai | 121592 |
| Brachysomophis kampeni Weber & de Beaufort, 1916 | Lamnostoma kampeni | 94476 |
| Ophichthus karreri Blache, 1975 | Ophichthus serpentinus | 84366 |
| Sphagebranchus kaupii Bleeker, 1858 | Yirrkala kaupii | 6128 |
| Myrichthys keckii Silvester, 1915 | Myrichthys ocellatus | 26282 |
| Leptocephalus kefersteini Kaup, 1860 | Echelus myrus | 30952 |
| Sphagebranchus kendalli Gilbert, 1891 | Apterichtus kendalli | 4455 |
| Apterichtus keramanus Machida, Hashimoto & Yamakawa, 1997 | Apterichtus keramanus | 13667 |
| Ophichthys kirkii Günther, 1870 | Bascanichthys kirkii | 3972 |
| Sphagebranchus klazingai Weber, 1913 | Apterichtus klazingai | 3972 |
| Ophichthus kunaloa McCosker, 1979 | Ophichthus kunaloa | 26282 |
| Aphthalmichthys kuro Kuroda, 1947 | Caecula kuro | 80565 |
| Muraenichthys labialis Seale, 1917 | Schismorhynchus labialis | 7300 |
| Leuropharus lasiops Rosenblatt & McCosker, 1970 | Leuropharus lasiops | 27478 |
| Ophisurus latemaculatus Poey, 1867 | Myrichthys ocellatus | 26282 |
| Myropterura laticaudata Ogilby, 1897 | Scolecenchelys laticaudata | 104540 |
| Gordiichthys leibyi McCosker & Böhlke, 1984 | Gordiichthys leibyi | 27116 |
| Muraenichthys lengomena Scott, 1980 | Scolecenchelys australis | 40863 |
| Skythrenchelys lentiginosa Castle & McCosker, 1999 | Skythrenchelys macrostomus | 40863 |
| Ophichthus lentiginosus McCosker, 2010 | Ophichthus lentiginosus | 84366 |
| Ophichthus leonensis Blache, 1975 | Ophichthus leonensis | 4455 |
| Myrophis lepturus Kotthaus, 1968 | Myrophis lepturus | 40911 |
| Caecula leucoptera Cadenat, 1954 | Callechelys leucoptera | 27478 |
| Oxyodontichthys limbatus Poey, 1880 | Ophichthus gomesii | 26282 |
| Ophichthus limkouensis Chen, 1929 | Ophichthus limkouensis | 39782 |
| Muraenichthys lingowenah Scott, 1975 | Scolecenchelys australis | 40863 |
| Leiuranus lithinus Jordan & Richardson, 1908 | Ophichthus lithinus | 75154 |
| Muraena longicollis Cuvier, 1816 | Echelus myrus | 26282 |
| Myrophis longicollis Peters, 1864 | Myrophis plumbeus | 4455 |
| Mixomyrophis longidorsalis Hibino, Kimura & Golani, 2014 | Mixomyrophis longidorsalis | 96670 |
| Asarcenchelys longimanus McCosker, 1985 | Asarcenchelys longimanus | 27116 |
| Ophichthus longipenis McCosker & Rosenblatt, 1998 | Ophichthus longipenis | 31243 |
| Brachysomophis longipinnis McCosker & Randall, 2001 | Brachysomophis longipinnis | 42180 |
| Sphagebranchus longipinnis Kner & Steindachner, 1867 | Bascanichthys longipinnis | 6993 |
| Callechelys longissimus Cadenat & Marchal, 1963 | Phaenomonas longissima | 4455 |
| Myrophis longleii Silvester, 1915 | Myrophis punctatus | 26282 |
| Ophisurus longus Poey, 1867 | Myrichthys breviceps | 26282 |
| Caralophia loxochila Böhlke, 1955 | Caralophia loxochila | 7251 |
| Ophisurus lumbricoides Bleeker, 1852 | Ophichthus rutidoderma | 58467 |
| Sphagebranchus lumbricoides Bleeker, 1864 | Yirrkala lumbricoides | 58467 |
| Myrophis lumbricus Jordan & Gilbert, 1882 | Myrophis punctatus | 26282 |
| Callechelys lutea Snyder, 1904 | Callechelys lutea | 27478 |
| Cirricaecula macdowelli McCosker & Randall, 1993 | Cirricaecula macdowelli | 10893 |
| Microdonophis macgregori Jenkins, 1903 | Cirrhimuraena playfairii | 26282 |
| Ophichthus machidai McCosker, Ide & Endo, 2012 | Ophichthus machidai | 90265 |
| Ophisurus macrochir Bleeker, 1853 | Ophichthus macrochir | 27116 |
| Sphagebranchus macrodon Bleeker, 1863 | Yirrkala macrodon | 27116 |
| Myrophis macrophthalmus Parr, 1930 | Ahlia egmontis | 26282 |
| Ophichthus macrops Günther, 1910 | Ophichthus macrops | 39782 |
| Muraenichthys macropterus Bleeker, 1857 | Scolecenchelys macroptera | 1602 |
| Ophisurus macrorhynchos Bleeker, 1853 | Ophisurus macrorhynchos | 40966 |
| Muraenichthys macrostomus Bleeker, 1864 | Skythrenchelys macrostomus | 93652 |
| Ophichthys macrurus Poey, 1867 | Ophichthus gomesii | 26282 |
| Phyllophichthus macrurus McKay, 1970 | Phyllophichthus xenodontus | 75154 |
| Caecula maculata Klausewitz, 1964 | Yirrkala maculata | 40911 |
| Callechelys maculatus Chu, Wu & Jin, 1981 | Callechelys maculatus | 83763 |
| Cogrus maculatus Rafinesque, 1810 | Ophichthus maculatus | 40911 |
| Pisodonophis maculatus Kaup, 1856 | Callechelys marmorata | 33390 |
| Muraena maculosa Cuvier, 1816 | Myrichthys maculosus | 40867 |
| Ophichthus madagascariensis Fourmanoir, 1961 | Pisodonophis cancrivorus | 84366 |
| Ophichthys madagascariensis Fourmanoir, 1961 | Pisodonophis cancrivorus | 84366 |
| Pisoodonophis magnifica (non Abbott, 1860) | Myrichthys maculosus | 26145 |
| Pisoodonophis magnifica Abbott, 1860 | Myrichthys magnificus | 40867 |
| Scytalophis magnioculis Kaup, 1856 | Ophichthus gomesii | 26282 |
| Apterichtus malabar McCosker & Hibino, 2015 | Apterichtus malabar | 101270 |
| Muraenichthys malabonensis Herre, 1923 | Muraenichthys thompsoni | 40863 |
| Ophichthus manilensis Herre, 1923 | Ophichthus manilensis | 27116 |
| Omochelys marginatus Fowler, 1948 | Ophichthus cruentifer | 26282 |
| Ophiurus marginatus Peters, 1855 | Ophichthus marginatus | 26282 |
| Dalophis marmorata Bleeker, 1854 | Callechelys marmorata | 27478 |
| Neenchelys mccoskeri Hibino, Ho & Kimura, 2012 | Neenchelys mccoskeri | 92296 |
| Ophichthus mecopterus McCosker & Rosenblatt, 1998 | Ophichthus mecopterus | 31243 |
| Ophichthus megalops Asano, 1987 | Ophichthus megalops | 12708 |
| Ophichthys melanochir Bleeker, 1864 | Ophichthus altipennis | 43769 |
| Ophichthus melanoporus Kanazawa, 1963 | Ophichthus melanoporus | 7251 |
| Callechelys melanotaenia Bleeker, 1864 | Callechelys catostoma | 27478 |
| Ophichthus melope McCosker & Rosenblatt, 1998 | Ophichthus melope | 31243 |
| Ophichthus menezesi McCosker & Böhlke, 1984 | Ophichthus menezesi | 27116 |
| Ethadophis merenda Rosenblatt & McCosker, 1970 | Ethadophis merenda | 9328 |
| Ophichthus microcephalus Day, 1878 | Ophichthus microcephalus | 127961 |
| Ophichthys microcephalus Day, 1878 | Ophichthus microcephalus | 127961 |
| Echelus microchir Bleeker, 1864 | Myrophis microchir | 26282 |
| Pseudomyrophis micropinna Wade, 1946 | Pseudomyrophis micropinna | 9328 |
| Myrophis microps Parr, 1930 | Ahlia egmontis | 26282 |
| Ophichthus microstictus McCosker, 2010 | Ophichthus microstictus | 84366 |
| Myrophis microstigmius Poey, 1867 | Myrophis punctatus | 26282 |
| Conger microstoma Eydoux & Souleyet, 1850 | Pisodonophis boro | 97306 |
| Muraenichthys microstomus Bleeker, 1864 | Muraenichthys gymnopterus | 27116 |
| Neenchelys microtretus Bamber, 1915 | Neenchelys microtretus | 27116 |
| Caecula mindora Jordan & Richardson, 1908 | Lamnostoma mindora | 6128 |
| Ophisurus minimus McClelland, 1844 | Pisodonophis boro | 94476 |
| Ophichthys misolensis Günther, 1872 | Yirrkala misolensis | 40911 |
| Ophichthys miurus Jordan & Gilbert, 1882 | Scytalichthys miurus | 26282 |
| Ophichthus miyamotonis Tanaka, 1913 | Myrichthys maculosus | 40867 |
| Leptocephalus mollis Fowler, 1944 | Myrophis punctatus | 26282 |
| Pisoodonophis moluccensis Bleeker, 1864 | Yirrkala moluccensis | 46206 |
| Caecula monodi Roux, 1966 | Apterichtus monodi | 4455 |
| Yirrkala moorei McCosker, 2006 | Yirrkala moorei | 56883 |
| Conger mordax Poey, 1860 | Echiophis punctifer | 54133 |
| Sphagebranchus moseri Jordan & Snyder, 1901 | Apterichtus moseri | 11672 |
| Leptocephalus mucronatus Eigenmann & Kennedy, 1902 | Ophichthus cruentifer | 26282 |
| Dalophis multidentatus Blache & Bauchot, 1972 | Dalophis multidentatus | 4455 |
| Ophichthus multiserialis Norman, 1939 | Xyrias multiserialis | 26282 |
| Callechelys muraena Jordan & Evermann, 1887 | Callechelys muraena | 27478 |
| Callechelys myersi Herre, 1932 | Bascanichthys myersi | 280 |
| Muraena myrus Linnaeus, 1758 | Echelus myrus | 4455 |
| Apterichtus mysi McCosker & Hibino, 2015 | Apterichtus mysi | 101270 |
| Ophichthus mystacinus McCosker, 1999 | Ophichthus mystacinus | 31795 |
| Ophichthus naevius Kodeeswaran, Kathirvelpandian, Mohapatra, Kumar & Sarkar, 2023 | Ophichthus naevius | 130619 |
| Apterichtus nariculus McCosker & Hibino, 2015 | Apterichtus nariculus | 101270 |
| Suculentophichthus nasus Fricke, Golani & Appelbaum-Golani, 2015 | Suculentophichthus nasus | 103840 |
| Caecula natalensis Fowler, 1934 | Yirrkala tenuis | 3972 |
| Callechelys nebulosus Smith, 1962 | Xestochilus nebulosus | 1623 |
| Jenkinsiella nectura Jordan, 1907 | Cirrhimuraena tapeinoptera | 27116 |
| Muraenichthys nicholsarum Waite, 1904 | Scolecenchelys nicholsarum | |
| Ophisurus nigrepinnis Liénard, 1842 | Pisodonophis cancrivorus | 33390 |
| Ophichthus nigroventralis Kodeeswaran, Mohapatra & Kumar, 2023 | Ophichthus nigroventralis | 130908 |
| Pseudomyrophis nimius Böhlke, 1960 | Pseudomyrophis nimius | 27116 |
| Ophichthys nothochir Gilbert, 1890 | Quassiremus nothochir | 26282 |
| Neenchelys nudiceps Tashiro, Hibino & Imamura, 2015 | Neenchelys nudiceps | 116659 |
| Dalophis obtusirostris Blache & Bauchot, 1972 | Dalophis obtusirostris | 4455 |
| Ophichthus obtusus McCosker, Ide & Endo, 2012 | Ophichthus obtusus | 90265 |
| Muraenophis ocellata Lesueur, 1825 | Myrichthys ocellatus | 12965 |
| Pisodonophis oculatus Kaup, 1856 | Myrichthys ocellatus | 3814 |
| Sphagebranchus oculatus Risso, 1827 | Dalophis imberbis | 6564 |
| Scolecenchelys ogilbyi Fowler, 1907 | Scolecenchelys breviceps | 93826 |
| Muraenichthys okamurai Machida & Ohta, 1996 | Scolecenchelys aoki | 92899 |
| Ophichthus olivaceus McCosker & Bogorodsky, 2020 | Ophichthus olivaceus | 123091 |
| Jenkinsiella oliveri Seale, 1910 | Cirrhimuraena oliveri | 27116 |
| Muraenichthys oliveri Waite, 1910 | Scolecenchelys australis | 33839 |
| Sphagebranchus omanensis Norman, 1939 | Yirrkala omanensis | 12965 |
| Ophichthus omorgmus McCosker & Böhlke, 1984 | Ophichthus omorgmus | 27116 |
| Letharchus opercularis Myers & Wade, 1941 | Paraletharchus opercularis | 31241 |
| Leptocephalus ophichthoides D'Ancona, 1928 | Leptocephalus ophichthoides | 12541 |
| Sphagebranchus ophioneus Evermann & Marsh, 1900 | Ichthyapus ophioneus | 4455 |
| Muraena ophis Linnaeus, 1758 | Ophichthus ophis | 1830 |
| Hemerorhinus opici Blache & Bauchot, 1972 | Hemerorhinus opici | 4455 |
| Yirrkala ori McCosker, 2011 | Yirrkala ori | 86861 |
| Apterichtus orientalis Machida & Ohta, 1994 | Apterichtus orientalis | 13362 |
| Cirrhimuraena orientalis Nguyen, 1993 | Cirrhimuraena orientalis | 46206 |
| Dalophis orientalis McClelland, 1844 | Lamnostoma orientale | 6128 |
| Herpetoichthys ornatissimus Kaup, 1856 | Herpetoichthys regius | 54133 |
| Muraenichthys owstoni Jordan & Snyder, 1901 | Scolecenchelys macroptera | 40863 |
| Echelus oxyrinchus Rafinesque, 1810 | Ophisurus serpens | 4455 |
| Myrus pachyrhynchus Vaillant, 1888 | Echelus pachyrhynchus | 4455 |
| Letharchus pacificus Osburn & Nichols, 1916 | Paraletharchus pacificus | 26282 |
| Myrichthys paleracio McCosker & Allen, 2012 | Myrichthys paleracio | 89079 |
| Bascanichthys panamensis Meek & Hildebrand, 1923 | Bascanichthys panamensis | 9328 |
| Caecula pantherina Cadenat, 1956 | Callechelys guineensis | 27478 |
| Myrichthys pantostigmius Jordan & McGregor, 1898 | Myrichthys pantostigmius | 40867 |
| Callechelys papulosa McCosker, 1998 | Callechelys papulosa | 27478 |
| Ophisurus pardalis Valenciennes, 1839 | Myrichthys pardalis | 4455 |
| Ophisurus parilis Richardson, 1848 | Ophichthus cylindroideus | 54133 |
| Neenchelys parvipectoralis Chu, Wu & Jin, 1981 | Neenchelys parvipectoralis | 92296 |
| Cirrhimuraena paucidens Herre & Myers, 1931 | Cirrhimuraena paucidens | 39782 |
| Bascanichthys paulensis Storey, 1939 | Bascanichthys paulensis | 27116 |
| Neenchelys pelagica Ho, McCosker & Smith, 2015 | Neenchelys pelagica | 96531 |
| Rhinophichthus penicillatus McCosker, 1999 | Rhinophichthus penicillatus | 31795 |
| Callechelys peninsulae Gilbert, 1892 | Myrichthys xysturus | 26282 |
| Evips percinctus McCosker, 1972 | Evips percinctus | 1602 |
| Neoconger perlongus Poey, 1875 | Myrophis punctatus | 54621 |
| Callechelys perryae Storey, 1939 | Callechelys guineensis | 27478 |
| Caecula philippinensis Herre, 1936 | Yirrkala philippinensis | 87133 |
| Muraenichthys philippinensis Schultz & Woods, 1949 | Muraenichthys philippinensis | 39782 |
| Machaerenchelys phoenixensis Schultz, 1943 | Leiuranus semicinctus | 3972 |
| Lamnostoma pictum Kaup, 1856 | Lamnostoma orientale | 6128 |
| Ophichthys pinguis Günther, 1872 | Malvoliophis pinguis | 26282 |
| Leptenchelys pinnaceps Schultz, 1953 | Callechelys catostoma | 27478 |
| Phaenomonas pinnata Myers & Wade, 1941 | Phaenomonas pinnata | 9328 |
| Ophichthys pisavarius Poey, 1876 | Myrichthys breviceps | 26282 |
| Caecula platyrhyncha Gosline, 1951 | Ichthyapus platyrhynchus | 58302 |
| Caecula platyrhyncha (non Gosline, 1951) | Ichthyapus vulturis | 58302 |
| Myrophis platyrhynchus Breder, 1927 | Myrophis platyrhynchus | 5521 |
| Aprognathodon platyventris Böhlke, 1967 | Aprognathodon platyventris | 7251 |
| Ophichthys playfairii Günther, 1870 | Cirrhimuraena playfairii | 3972 |
| Holopterura plumbea Cope, 1871 | Myrophis plumbeus | 4455 |
| Quassiremus polyclitellum Castle, 1996 | Quassiremus polyclitellum | 13068 |
| Ophisurus polyodon Bleeker, 1860 | Cirrhimuraena chinensis | 27116 |
| Dalophis polyophthalmus Bleeker, 1853 | Lamnostoma polyophthalmum | 4832 |
| Ophichthus polyophthalmus Bleeker, 1864 | Ophichthus polyophthalmus | 33390 |
| Echelus polyspondylus McCosker & Ho, 2015 | Echelus polyspondylus | 106143 |
| Ophisurus porphyreus Temminck & Schlegel, 1846 | Brachysomophis porphyreus | 42180 |
| Stictorhinus potamius Böhlke & McCosker, 1975 | Stictorhinus potamius | 58455 |
| Ophisurus potamophilus Bleeker, 1854 | Pisodonophis boro | 94476 |
| Quassiremus productus Seale, 1917 | Quassiremus ascensionis | 26282 |
| Muraenichthys profundorum McCosker & Parin, 1995 | Scolecenchelys profundorum | 13468 |
| Caecula pterygera Vahl, 1794 | Caecula pterygera | 7245 |
| Caecula pterygera (non Vahl, 1794) | Lamnostoma orientale | 3972 |
| Muraenichthys puhioilo McCosker, 1979 | Scolecenchelys puhioilo | 27116 |
| Ophichthus pullus McCosker, 2005 | Ophichthus pullus | 86730 |
| Echelus punctatus Rafinesque, 1810 | Echelus myrus | 4455 |
| Myrophis punctatus (non Lütken, 1852) | Myrophis plumbeus | 4455 |
| Myrophis punctatus Lütken, 1852 | Myrophis punctatus | 7251 |
| Cryptopterus puncticeps Kaup, 1859 | Ophichthus puncticeps | 89336 |
| Anguilla puncticulata Swainson, 1839 | Pisodonophis hijala | 94476 |
| Crotalopsis punctifer Kaup, 1859 | Echiophis punctifer | 89336 |
| Anguisurus punctulatus Kaup, 1856 | Lamnostoma polyophthalmum | 94476 |
| Mixomyrophis pusillipinna McCosker, 1985 | Mixomyrophis pusillipinna | 27116 |
| Bascanichthys pusillus Seale, 1917 | Bascanichthys pusillus | 39782 |
| Ophisurus ramiger Valenciennes, 1847 | Ophichthus remiger | 31243 |
| Callechelys randalli McCosker, 1998 | Callechelys randalli | 27478 |
| Gordiichthys randalli McCosker & Böhlke, 1984 | Gordiichthys randalli | 27116 |
| Ophisurus regius Richardson, 1848 | Herpetoichthys regius | 54133 |
| Centrurophis remicaudus Kaup, 1856 | Ophichthus rufus | 40966 |
| Ophisurus remiger Valenciennes, 1837 | Ophichthus remiger | 31243 |
| Ophichthus retifer Fowler, 1935 | Ophichthus erabo | 3972 |
| Ophichthus retrodorsalis Liu, Tang & Zhang, 2010 | Ophichthus retrodorsalis | 90246 |
| Neenchelys retropinna Smith & Böhlke, 1983 | Neenchelys cheni | 96531 |
| Muraenichthys retropinnis Fowler, 1934 | Schultzidia retropinnis | 27116 |
| Ophichthys retropinnis Eigenmann, 1887 | Ophichthus puncticeps | 26282 |
| Xyrias revulsus Jordan & Snyder, 1901 | Xyrias revulsus | 27335 |
| Ophichthus rex Böhlke & Caruso, 1980 | Ophichthus rex | 7251 |
| Antobrantia ribeiroi Pinto, 1970 | Ophichthus ophis | 26282 |
| Scolecenchelys robusta Hibino & Kimura, 2015 | Scolecenchelys robusta | 104540 |
| Letharchus rosenblatti McCosker, 1974 | Letharchus rosenblatti | 9328 |
| Ophichthus roseus Tanaka, 1917 | Ophichthus roseus | 39782 |
| Ophisurus rostellatus Richardson, 1848 | Mystriophis rostellatus | 4455 |
| Ophisurus rostratus McClelland, 1844 | Pisodonophis boro | 94476 |
| Ophichthus rotundus Lee & Asano, 1997 | Ophichthus rotundus | 40862 |
| Echelus rufus Rafinesque, 1810 | Ophichthus rufus | 12965 |
| Ophichthus rugifer Jordan & Bollman, 1890 | Ophichthus rugifer | 31243 |
| Myrichthys rupestris Snyder, 1912 | Myrichthys maculosus | 40867 |
| Ophisurus rutidoderma Bleeker, 1852 | Ophichthus rutidoderma | 94476 |
| Ophisurus rutidodermatoides Bleeker, 1852 | Ophichthus rutidoderma | 58467 |
| Bascanichthys ryukyuensis Hibino, Yamashita & Sakurai, 2022 | Bascanichthys ryukyuensis | 127464 |
| Pisodonophis sangjuensis Ji & Kim, 2011 | Ophichthus sangjuensis | 86398 |
| Brachysomophis sauropsis Schultz, 1943 | Brachysomophis crocodilinus | 42180 |
| Ophisurus schaapii Bleeker, 1852 | Pisodonophis cancrivorus | 94476 |
| Ophichthys schneideri Steindachner, 1879 | Echiophis punctifer | 26282 |
| Muraenichthys schultzei Bleeker, 1857 | Muraenichthys schultzei | 33390 |
| Muraenichthys schultzei (non Bleeker, 1857) | Scolecenchelys laticaudata | 104540 |
| Sphagebranchus scuticaris Goode & Bean, 1880 | Bascanichthys scuticaris | 26282 |
| Apterichthys selachops Jordan & Gilbert, 1882 | Ichthyapus selachops | 26282 |
| Ophisurus semicinctus Lay & Bennett, 1839 | Leiuranus semicinctus | 7300 |
| Ophisurus semicinctus Richardson, 1848 | Pisodonophis semicinctus | 4455 |
| Ophichthus semilunatus Hibino & Chiu, 2019 | Ophichthus semilunatus | 121619 |
| Dalophis serpa Rafinesque, 1810 | Dalophis imberbis | 27116 |
| Anguilla serpens Shaw, 1803 | Ophichthus ophis | 50838 |
| Muraena serpens Linnaeus, 1758 | Ophisurus serpens | 4455 |
| Ophichthus serpentinus Seale, 1917 | Ophichthus serpentinus | 11228 |
| Ophichthus shaoi McCosker & Ho, 2015 | Ophichthus shaoi | 106143 |
| Callechelys sibogae Weber, 1913 | Bascanichthys sibogae | 27478 |
| Muraenichthys sibogae Weber & de Beaufort, 1916 | Muraenichthys sibogae | 40863 |
| Neenchelys similis Ho, McCosker & Smith, 2015 | Neenchelys similis | 96531 |
| Ophisurus sinensis Richardson, 1848 | Pisodonophis cancrivorus | 94476 |
| Ophichthus singapurensis Bleeker, 1864-65 | Ophichthus singapurensis | 36648 |
| Apterichtus soyoae Hibino, 2018 | Apterichtus soyoae | 119357 |
| Ophisurus spadiceus Richardson, 1846 | Ophichthus apicalis | 94476 |
| Leptocephalus spallanzani (non Risso, 1810) | Dalophis imberbis | 6564 |
| Acanthenchelys spinicauda Norman, 1922 | Ophichthus spinicauda | 12965 |
| Gordiichthys springeri Ginsburg, 1951 | Callechelys springeri | 27478 |
| Ophichthus stenopterus Cope, 1871 | Ophichthus stenopterus | 39782 |
| Ophichthus stypurus Smith & Swain, 1882 | Myrichthys magnificus | 40867 |
| Apterichtus succinus Hibino, McCosker & Kimura, 2016 | Apterichtus succinus | 108477 |
| Herpetoichthys sulcatus Kaup, 1856 | Ophichthus ophis | 4455 |
| Sympenchelys taiwanensis Hibino, Ho & Kimura, 2015 | Sympenchelys taiwanensis | 106139 |
| Cirrhimuraena tapeinoptera Bleeker, 1863 | Cirrhimuraena tapeinoptera | |
| Muraenichthys tasmaniensis McCulloch, 1911 | Scolecenchelys australis | 104540 |
| Scolecenchelys tasmaniensis smithi Whitley, 1944 | Scolecenchelys australis | 104540 |
| Caecula taylori Herre, 1923 | Lamnostoma taylori | 280 |
| Ophichthus tchangi Tang & Zhang, 2002 | Ophichthus tchangi | 46206 |
| Leptenchelys tenuis Tortonese, 1964 | Bascanichthys longipinnis | 94476 |
| Ophichthys tenuis Günther, 1870 | Yirrkala tenuis | 3972 |
| Sphagebranchus teres Goode & Bean, 1882 | Bascanichthys scuticaris | 26282 |
| Ophichthus tetratrema McCosker & Rosenblatt, 1998 | Ophichthus tetratrema | 31243 |
| Muraenichthys thompsoni Jordan & Richardson, 1908 | Muraenichthys thompsoni | 39782 |
| Muraena tigrina Rüppell, 1830 | Myrichthys maculosus | 40867 |
| Myrichthys tigrinus Girard, 1859 | Myrichthys tigrinus | 9328 |
| Ophichthus timorensis Günther, 1870 | Yirrkala lumbricoides | 58467 |
| Ophichthus tomioi McCosker, 2010 | Ophichthus tomioi | 84366 |
| Muraenopsis triserialis Kaup, 1856 | Ophichthus triserialis | 31243 |
| Ophichthys triserialis Barnard, 1923 | Ophichthus unicolor | 26282 |
| Ophichthus tsuchidae Jordan & Snyder, 1901 | Ophichthus tsuchidae | 559 |
| Achirophichthys typus Bleeker, 1864 | Brachysomophis crocodilinus | 42180 |
| Brachysomophis umbonis McCosker & Randall, 2001 | Brachysomophis umbonis | 42180 |
| Leptocephalus undulatus Strömman, 1896 | Myrichthys breviceps | 26282 |
| Ophichthus unicolor Regan, 1908 | Ophichthus unicolor | 3972 |
| Echidna uniformis Seale, 1901 | Scolecenchelys macroptera | 40863 |
| Ophichthys uniserialis Cope, 1877 | Ophichthus remiger | 31243 |
| Conger urolophus Temminck & Schlegel, 1846 | Ophichthus urolophus | 26282 |
| Conger uropterus Temminck & Schlegel, 1846 | Echelus uropterus | 26282 |
| Myrophis vafer (non Jordan & Gilbert, 1883) | Myrophis plumbeus | 4455 |
| Myrophis vafer Jordan & Gilbert, 1883 | Myrophis vafer | 2850 |
| Machaerenchelys vanderbilti Fowler, 1938 | Leiuranus semicinctus | 26282 |
| Letharchus velifer Goode & Bean, 1882 | Letharchus velifer | 7251 |
| Muraenichthys velinasalis Hibino & Kimura, 2015 | Muraenichthys velinasalis | 106110 |
| Chilorhinus vermiformis Peters, 1866 | Scolecenchelys vermiformis | 40863 |
| Leptenchelys vermiformis Myers & Wade, 1941 | Leptenchelys vermiformis | 9328 |
| Ophisurus vermiformis McClelland, 1844 | Pisodonophis boro | 94476 |
| Ophisurus versicolor Richardson, 1848 | Leiuranus versicolor | 75154 |
| Muraena vulgaris Kaup, 1856 | Echelus myrus | 30952 |
| Sphagebranchus vulturis Weber & de Beaufort, 1916 | Ichthyapus vulturis | 26282 |
| Glenoglossa wassi McCosker, 1982 | Glenoglossa wassi | 26282 |
| Ophichthus woosuitingi Chen, 1929 | Ophichthus woosuitingi | 39782 |
| Phyllophichthus xenodontus Gosline, 1951 | Phyllophichthus xenodontus | 1602 |
| Muraenichthys xorae Smith, 1958 | Scolecenchelys xorae | 3972 |
| Ophichthys xysturus Jordan & Gilbert, 1882 | Myrichthys xysturus | 26282 |
| Cirrhimuraena yuanding Tang & Zhang, 2003 | Cirrhimuraena yuanding | 76789 |
| Skythrenchelys zabra Castle & McCosker, 1999 | Skythrenchelys zabra | 40863 |
| Ophichthus zonatus Howell Rivero, 1932 | Ophichthus spinicauda | 26282 |
| Pisodonophis zophistius Jordan & Snyder, 1901 | Ophichthus altipennis | 86398 |
| Pisoodonophis zophistius (non Jordan & Snyder, 1901) | Pisodonophis boro | 27116 |
| Ophichthus zophochir Jordan & Gilbert, 1882 | Ophichthus zophochir | 31243 |
| Aplatophis zorro McCosker & Robertson, 2001 | Aplatophis zorro | 43686 |