Plectranthias knappi is a species of fish in the family Serranidae occurring in the western-central Pacific Ocean. Randall, J.E., 1996. Two new anthiine fishes of the genus Plectranthias (Perciformes: Serranidae), with a key to the species. Micronesica 29(2):113-131.
Size This species reaches a length of .
Etymology The fish is named in honor of Smithsonian ichthyologist Leslie W. Knapp (1929-2017), who was the one who collected the type specimen and recognized it as probably representing an undescribed species.
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