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Pygoplites diacanthus, commonly known as the Regal angelfish or Royal angelfish, is a strikingly beautiful species belonging to the family Pomacanthidae. Here are some key characteristics and information about Pygoplites diacanthus:

1. Appearance: The Regal angelfish is known for its vibrant coloration and elegant appearance. It has a deep, oval-shaped body with alternating bands of blue and yellow or gold. The dorsal and anal fins are elongated, giving it a graceful finnage. The face is usually blue with yellow accents, and it has a distinctive black spot on the caudal peduncle.
2. Distribution: Pygoplites diacanthus is found in the Indo-Pacific region, ranging from the eastern coast of Africa and the Red Sea to the central and western Pacific Ocean, including the Great Barrier Reef.
3. Habitat: This species inhabits coral reefs and lagoons, typically found in areas with rich coral growth and plenty of hiding places among branching corals and reef structures. They are often observed in pairs or small groups.
4. Behavior: Regal angelfish are omnivorous, feeding primarily on sponges, tunicates, algae, and small invertebrates. They are known to occasionally nip at corals and other sessile invertebrates in the aquarium, so care should be taken when selecting tank mates.