Gnathophis cinctus, the hardtail conger or Catalina conger,Common names for Gnathophis cinctus at www.fishbase.org. is an eel in the family Congridae (conger/garden eels).Gnathophis cinctus at www.fishbase.org. It was described by Samuel Garman in 1899, originally under the genus Atopichthys.Garman, S., 1899 (Dec.) [ref. 1540] The Fishes. In: Reports on an exploration off the west coasts of Mexico, Central and South America, and off the Galapagos Islands ... by the U. S. Fish Commission steamer "Albatross," during 1891 ... No. XXVI. Memoirs of the Museum of Comparative Zoology v. 24: Text: 1-431, Atlas: Pls. 1-85 + A-M. It is a tropical, marine eel which is known from the eastern central and southeastern Pacific Ocean, including Chile, Colombia, Costa Rica, Ecuador, El Salvador, Guatemala, Honduras, Mexico, Nicaragua, Panama, Peru, and the United States.Gnathophis cinctus at IUCN redlist. It dwells at a depth range of 9–336 metres, and leads a benthic lifestyle, burrowing into loose sand. Males can reach a maximum total length of .

The hardtail conger feeds on other conger eels.Food items reported for Gnathophis cinctus at www.fishbase.org. Due to its widespread distribution, lack of known threats, and lack of observed population decline, the IUCN redlist currently lists the hardtail conger as Least Concern.

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