Nettenchelys dionisi is an eel in the family Nettastomatidae (duckbill/witch eels). It was described by Alberto Brito in 1989.Brito, A., 1989 (27 Dec.) [ref. 13509] Nettenchelys dionisi, a new species of nettastomatid eel (Pisces: Anguilliformes) from the Canary Islands. Copeia 1989 (no. 4): 876-880. It is a marine, deep water-dwelling eel which is known from the Canary Islands, in the eastern central Atlantic Ocean. It dwells at a depth range of , and leads a benthic lifestyle. Males can reach a maximum total length of .
The species epithet, "dionisi" refers to Gustavo Perez-Dionis, and was given as a tribute for his contributions to the study of marine life in the Canary Islands.
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