Nettenchelys inion is an eel in the family Nettastomatidae (duckbill/witch eels). It was described by David G. Smith and James Erwin Böhlke in 1981.Smith, D. G., J. E. Böhlke and P. H. J. Castle, 1981 (20 July) [ref. 6158] A revision of the nettastomatid eel genera Nettastoma and Nettenchelys (Pisces: Anguilliformes), with descriptions of six new species. Proceedings of the Biological Society of Washington v. 94 (no. 2): 533-560. It is a marine, deep water-dwelling eel which is known from a single specimen discovered near North Bimini Marine Protected Area in 1964. It is known to dwell at a depth range of . Males can reach a total length of .
The species epithet "inion" means "back of head" in Greek, and is treated as a noun in apposition. It refers to the location of the posterior nostril.
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