Diaphus watasei, also known as Watases lanternfish, is a species of lanternfish found in the Indo-west Pacific.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 biologist Shozaburo Watasé (1862–1929), of the Imperial University of Tokyo, who presented the type specimen to Stanford University.
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