Whitecheek Tang Identification Guide

Key identification features

• Dark chocolate-brown to blackish body
• Small, distinct pale-white crescent patch just below and behind the eye
• Bright yellow oval ring surrounding the scalpel spine at the base of the tail
• Pale or white trailing edge on the tail fin
• Compact, oval body shape
• Overall coloring can look nearly black in low light, making the pale cheek mark and yellow tail ring especially useful for confirming the species

Common look-alikes

• Achilles tang (Acanthurus achilles): also dark-bodied, but shows a large orange-red teardrop patch near the tail rather than a white cheek mark, and an orange (not yellow) ring around the tail spine.
• Other plain brown Acanthurus species lack the pale crescent below the eye that gives the whitecheek tang its name.

Where you'll see one

Found on Indo-Pacific and Hawaiian coral reefs, typically on exposed reef slopes and surge channels with strong water movement. It grazes filamentous algae from rock and dead coral, often in loose aggregations, and is regularly seen alongside other surgeonfish species competing for the same algal turf.