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The Orange Spine Unicornfish (Naso lituratus) is a tropical fish species that belong to the surgeonfishes family Acanthuridae. It has a broad distribution throughout the Indo-Pacific region and in Australia it is found from the top of the Great Barrier Reef along the east coast to the Solitary Islands Marine Park in northern New South Wales. This species can be easily recognised by two bright orange forward hooked spines on the caudal peduncle (base of tail), its orange lips and black face mask. The body is brownish-grey with yellow nape and there is a broad black band on the dorsal fin. It can be found on coral reefs and often occurs in pairs. The Orange Spine Unicornfish (Naso lituratus) grows to a maximum length of approximately 45 cm.
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