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S. rivulatus in the terminal phase exhibit a strikingly beautiful color pattern. The body scales are green and each has an orange basal bar. The face has bright green lines on an orange background and a bright orange operculum. Parts of the dorsal and anal fins may be tri-colored with an orange central region surrounded by blue borders. The caudal fin is also orange with blue margins along the top and bottom of the fin. The pelvic fins are orange and have a bright blue lateral margin. The pectoral fins are chartreuse. Source: http://eol.org/pages/344827/details
Coral Reefs. Indo-Pacific.
Spotted in a morning dive at a depth of about 6 m.