Nettenchelys inion

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. 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 458 to 531 m. Males can reach a total length of 42.3 cm.

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.