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Rhinecanthus rectangulus. Similar in general appearance to others in this genus, with its upper body a brownish orange, with the head and lower body white. Its teeth and top lip are blue, and there are several blue black bands across the top of the head between the eyes, and a wide black band beginning at the eye and slanting rearward to the lower rear of the body. Its easily recognized by a large black wedge near the tail, hence one of its common names.