Diaphus knappi, the small lanternfish, is a species of lanternfish found in the Indo-Pacific Ocean.Hulley, P.A., 1986. Myctophidae. p. 282-321. In M.M. Smith and P.C. Heemstra (eds.) Smiths' sea fishes. Springer-Verlag, Berlin.
Description This species reaches a length of .
Etymology The fish is named in honor of Smithsonian ichthyologist Leslie W. Knapp (1929–2017), for providing the author with lanternfishes from both the Indian Ocean and Pacific Ocean.
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