After Froese & Pauly, 2001 [“The Fishbase”]

<==o Ophidion [Ophidium, Rissola] ?Paleoc. M. Eoc. Eu. Eoc. WInd. Mioc. Aus. R. Oc. ()? [23]
   |-- †O. voltiatum
   |-- O. barbatum Linnaeus, 1758 (partanilkka; Snake blenny)
   |-- O. exul Robins, 1991
   |-- O. fulvum (Hildebrand & Barton, 1949) (Earspot cusk eel)
   |-- O. galeoides (Gilbert, 1890) (Striped cusk eel)
   |-- O. genyopus (Ogilby, 1897)
   |-- O. grayi (Fowler, 1948) (Blotched cusk-eel)
   |-- O. holbrooki (Putnam, 1874) (Band cusk-eel)
   |-- O. imitator Lea, 1997
   |-- O. iris Breder, 1936 (Rainbow cusk eel)
   |-- O. josephi Girard, 1858
   |-- O. lagocheila (Böhlke & Robins, 1959) (Harelip cusk)
   |-- O. lozanoi Matallanas, 1990
   |-- O. marginatum (DeKay, 1842) (Striped cusk-eel)
   |-- O. metoecus Robins, 1991
   |-- O. muraenolepis (Günther, 1880)
   |-- O. nocomis Robins & Böhlke, 1959 (Letter opener)
   |-- O. robinsi Fahay, 1992
   |-- O. rochei Müller, 1845
   |-- O. saldanhai Matallanas & Brito, 1999
   |-- O. scrippsae (Hubbs, 1916) (Basketweave cusk-eel)
   |-- O. selenops Robins & Böhlke, 1959 (Mooneye cusk-eel)
   |-- O. smithi (Fowler, 1934)
   `-- O. welshi (Nichols & Breder, 1922) (Crested cusk-eel)

Reference(s):