Bassanago nielseni is an eel in the family Congridae (conger/garden eels).Bassanago nielseni at www.fishbase.org. It was described by Emma Stanislavovna Karmovskaya in 1990, originally under the genus Pseudoxenomystax.Karmovskaya, E. S., 1990 [ref. 20148] New species of conger eels (Congridae) from southeastern Pacific Seamounts. Voprosy Ikhtiologii v. 30 (no. 5): 764-772. It is a marine, deep-water dwelling eel which is known from the central and southern part of the Nazca Ridge, in the southeastern Pacific Ocean. It dwells at a depth range of 160–340 metres. Males can reach a maximum total length of 46.5 centimetres.
The species epithet was given in honour of Jorgen Nielsen, a specialist in the study of deep-sea fish.
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