SIZE: to 30 cm (12 in.)
DISTINCTIVE FEATURES: Orange tail spines and anal fin. Brown or gray with yellow edged black area from mouth to eye.
Unique to this species of surgeonfish are the orange tail spines and anal fin. The orangespine unicornfish is brown or gray in coloration, has a yellow forehead, and a black band at the base of the dorsal fin. Unlike some other species of unicornfish, this species lacks a horn. Males will develop long trailing filaments from each corner of the tail.