These differ from the similar Sargocentron diadema in that the red and white bands are nearly equal in width. This one was photographed by Christina Sylvester in a reef on the edge of the lagoon slope at the north end of Kwajalein Island.
The photo below from Stan Jazwinski shows the characteristic black spots on the first few dorsal fin membranes.
Created 8 January 2018
Updated 13 November 2020