Ophichthus mystacinus is an eel in the family Ophichthidae (worm/snake eels).Ophichthus mystacinus at www.fishbase.org. It was described by John E. McCosker in 1999.McCosker, J. E., 1999 [ref. 23699] Pisces Anguilliformes: deepwater snake eels (Ophichthidae) from the New Caledonia region, southwest Pacific Ocean. Mémoires du Muséum National d'Histoire Naturelle, Paris (N. S.) (Série A) Zoologie No. 180: 571-588. It is a marine, deep water-dwelling eel which is known from New Caledonia, in the western Pacific Ocean. It dwells at a depth range of . Males can reach a maximum total length of .
The species epithet "mystacinus" means "mustachioed" in Greek.
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