Diaphus basileusi is a species of lanternfish found in the western Indian Ocean.Bekker, V.E. and V.G. Prut'ko, 1984. A new species of the genus Diaphus (Myctophidae) from the northeastern Indian Ocean. J. Ichthyol. 24(6):82–87. .
Description This species reaches a length of .
Etymology The fish is named in honor of Basil Nafpaktitis (1929–2015), because of his investigations of myctophid systematics, especially of the genus Diaphus.
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