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Chaetodontoplus septentrionalis, commonly known as the Northern masked angelfish, is a species of marine angelfish belonging to the family Pomacanthidae. Here are some key characteristics and information about this species:

1. Distribution: The Northern masked angelfish is found in the Western Pacific Ocean, specifically in the waters around Japan, the Ogasawara Islands, and possibly extending to Taiwan. It inhabits coral reefs and rocky areas at depths ranging from 20 to 60 meters (65 to 200 feet).
2. Appearance: This angelfish species has a striking appearance with a predominantly dark body covered in blue-black scales. It has a distinctive yellow-orange mask-like pattern around the eyes and snout, extending back towards the gill covers. The dorsal and anal fins may have blue or white margins, adding to its overall color contrast.
3. Size: They typically grow to a maximum length of about 18 cm (7 inches).
4. Behavior: Northern masked angelfish are known to be shy and secretive, often hiding in crevices or among coral branches during the day. They emerge to feed on small invertebrates and algae found within their reef habitat. They can be territorial, especially towards conspecifics or similar-looking species.