After Nelson, 1994, with Recent species from Froese & Pauly, 2001 [“The Fishbase”]

<==o Ophichthidae [incl. Neenchelyidae, Aoteidae] (snake eels; käärmeankeriaat) [FB: 56/257]
   |?- Allips concolor McCosker, 1972
   |?- Aplatophis chauliodus Böhlke, 1956 (Fangtooth snake eel)
   |?- Aprognathodon platyventris Böhlke, 1967 (Stripe eel)
   |?-o Brachysomophis [4]
   |  |-- B. atlanticus Blache & Saldanha, 1972
   |  |-- B. cirrocheilos (Bleeker, 1857) (Stargazer snake eel)
   |  |-- B. crocodilinus (Bennett, 1833) (Crocodile snake eel)
   |  `-- B. sauropsis Schultz, 1943 (Reptilian snake eel)
   |?- Caralophia loxochila Böhlke, 1955 Slantlip eel
   |?-o Cirricaecula [2]
   |  |-- C. johnsoni Schultz, 1953 (Fringelip snake eel)
   |  `-- C. macdowelli McCosker & Randall, 1993
   |?-o Elapsopis [2]
   |  |-- E. cyclorhinus (Fraser-Brunner, 1934)
   |  `-- E. versicolor (Richardson, 1848) (Convict snake eel)
   |?- Evips persinctus McCosker, 1972
   |?-o Gordiichthys [4]
   |  |-- G. ergodes McCosker, Böhlke & Böhlke, 1989
   |  |-- G. irretitus Jordan & Davis, 1891 (Horsehair eel)
   |  |-- G. leibyi McCosker & Böhlke, 1984
   |  `-- G. randalli McCosker & Böhlke, 1984
   |?- Hemerorhinus opici Blache & Bauchot, 1972
   |?- Herpetoichthys fossatus (Myers & Wade, 1941) Mustachioed snake-eel
   |?- Hyphalophis devius McCosker & Böhlke, 1982
   |?-o Ichthyapus [5]
   |  |-- I. acuticeps (Barnard, 1923) (Sharpnose sand-eel)
   |  |-- I. omanensis (Norman, 1939) (Oman snake eel)
   |  |-- I. ophioneus (Evermann & Marsh, 1900) (Surf eel)
   |  |-- I. selachops (Jordan & Gilbert, 1882) (Smiling snake-eel)
   |  `-- I. vulturus (Weber & de Beaufort, 1916) (Vulture sand eel)
   |?- Kertomichthys blastorhinos (Kanazawa, 1963)
   |?- Leiuranus semicinctus (Lay & Bennett, 1839) (Saddled snake eel)
   |?- Leptenchelys vermiformis Myers & Wade, 1941 (Slender worm-eel)
   |?- Lethogoleos andersoni McCosker & Böhlke, 1982
   |?- Leuropharus lasiops Rosenblatt & McCosker, 1970 (Acned snake-eel)
   |?- Malvoliophis pinguis (Günther, 1872)
   |?-o Ophisurus [2]
   |  |-- O. macrorhynchus Bleeker, 1853
   |  `-- O. serpens (Linnaeus, 1758) (Serpent eel)
   |?-o Paraletharchus [2]
   |  |-- P. opercularis (Myers & Wade, 1941)
   |  `-- P. pacificus (Osburn & Nichols, 1916) (Sailfin eel)
   |?-o Phyllophichthus [2]
   |  |-- P. macrurus McKay, 1970
   |  `-- P. xenodontus Gosline, 1951 (Flappy snake-eel)
   |?-o Quassiremus [4]
   |  |-- Q. ascensionis (Studer, 1889) (Blackspotted snake eel)
   |  |-- Q. evionthas (Jordan & Bollman, 1890) (Galapagos snake eel)
   |  |-- Q. nothochir (Gilbert, 1890) (Smallfish snake-eel)
   |  `-- Q. polyclitellum Castle, 1996
   |?- Rhinophichthus penicillatus McCosker, 1999
   |?- Scytalichthys miurus (Jordan & Gilbert, 1882) (Short-tailed viper-eel)
   |?- Stictorhinus potamius Böhlke & McCosker, 1975
   |?- Xestochilus nebulosus (Smith, 1962)
   |?-o Xyrias [3]
   |  |-- X. guineensis (Blache, 1975)
   |  |-- X. multiserialis (Norman, 1939) (Speckled snake eel)
   |  `-- X. revulsus Jordan & Snyder, 1901
   |-- Myrophinae (worm eels; matoankeriaat) [Norton: 11 genera, 40 species]
   `-- Ophichthyinae (snake eels; käärmeankeriaat) [N: 41/210]

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