Diaphus diademophilus is a species of lanternfish found in the Indo-West Pacific Ocean.Nafpaktitis, B.G., 1978. Systematics and distribution of lanternfishes of the genera Lobianchia and Diaphus (Myctophidae) in the Indian Ocean. Nat. Hist. Mus. Los Angeles County, Sci. Bull. 30:1-92.
Description This species reaches a length of .
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