Recognized by the brilliant light-blue color (Ref. 48636). This species exhibits a marked sexual dichromatism: juveniles and females usually have a small black spot at the rear base of the dorsal fin and (at least in Micronesia) lack yellow; males have a bright yellow snout and tail and sometimes, latter all orange in some regions; also lack the black spot.
- Allen, G.R. 1991 Damselfishes of the world. Mergus Publishers, Melle, Germany. 271 p. (Ref. 7247) http://www.fishbase.org/references/FBRefSummary.php?id=7247&speccode=11793
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