Ilyophis arx is an eel in the family Synaphobranchidae (cutthroat eels).Ilyophis arx at www.fishbase.org. It was described by Catherine H. Robins in 1976.Robins, C. H., and C. R. Robins, 1976 (15 Apr.) [ref. 3784] New genera and species of dysommine and synaphobranchine eels (Synaphobranchidae) with an analysis of the Dysomminae. Proceedings of the Academy of Natural Sciences of Philadelphia v. 127: 249-280. It is a marine, deep water-dwelling eel which is known from the eastern Pacific and northeastern Atlantic Ocean. It dwells at a depth range of . Males can reach a maximum total length of .
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