Gnathophis bathytopos, the blackgut conger,Common names for Gnathophis bathytopos at www.fishbase.org. is an eel in the family Congridae (conger/garden eels). at www.fishbase.org. It was described by David G. Smith and Robert H. Kanazawa in 1977.Smith, D. G., and R. H. Kanazawa, 1977 [ref. 4036] Eight new species and a new genus of congrid eels from the western north Atlantic with redescriptions of Ariosoma analis, Hildebrandia guppyi, and Rhechias vicinalis. Bulletin of Marine Science v. 27 (no. 3): 530–543. It is a marine, deep water-dwelling eel which is known from the Straits of Florida, USA, and the southeastern Gulf of Mexico, in the western Atlantic Ocean. It dwells at a depth range of 180–370 meters. Males can reach a maximum total length of .

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