Gnathophis nystromi (known commonly as the conger eelCommon names for Gnathophis nystromi nystromi at www.fishbase.org.) is an eel in the family Congridae (conger/garden eels).Gnathophis nystromi ginanago at www.fishbase.org.Gnathophis nystromi nystromi at www.fishbase.org. It was described by David Starr Jordan and John Otterbein Snyder in 1901, originally under the genus Leptocephalus.Jordan, D. S. and J. O. Snyder, 1901 (28 Aug.) [ref. 2508] A review of the apodal fishes or eels of Japan, with descriptions of nineteen new species. Proceedings of the United States National Museum v. 23 (no. 1239): 837-890. It contains two subspecies, Gnathophis nystromi nystromi, and Gnathophis nystromi ginanago, which was described by Hirotoshi Asano in 1958, originally under the genus Rhynchocymba.Asano, H., 1958 (15 July) [ref. 12046] Studies on the conger eels of Japan. II. Description of two new fishes referable to the genera Rhynchocymba and Promyllantor. Dobutsugaku Zasshi = Zoological Magazine Tokyo v. 67 (no. 7): 197-201.
G. nystromi nystromi is a tropical, marine eel which is known from the western Pacific Ocean, including Japan, the South China Sea, and Hawaii. It dwells at a depth range of 250–355 meters, and inhabits reefs. Males can reach a maximum total length of , but more commonly reach a TL of .
G. nystromi ginanago is a marine, temperate water-dwelling eel which is known from Japan, in the northwestern Pacific Ocean. Males can reach a maximum total length of 40 centimeters.
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