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Body thin, oval in shape, with relatively long dorsal and anal fins and a crescent tail. Uniform in color without body bars. Can change from bluish gray to dark brown, and can pale or darken dramatically. Markings radiate from the eye. Dorsal, anal and tail fins with a blue or white border. Base of tail with a sharp spine (like a surgeon's scalpel), may have a pale band behind the spine (A. bahianus). Size up to 38 cm.
Shallow water inside reef.