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Heniochus monoceros, commonly known as the masked bannerfish or pennant coralfish, is a species of marine fish in the family Chaetodontidae. It is found in the Indian and Pacific Oceans, including the Red Sea, the Great Barrier Reef, and the waters around Hawaii.
The masked bannerfish has a distinctive appearance, with a deep black body and a white mask-like band across its face. Its dorsal fin is elongated and prominently displays a yellow-white coloration, resembling a pennant or banner, which gives the species its common name. The masked bannerfish can grow up to 25 cm in length.
This species is typically found in coral reefs and feeds on a variety of small invertebrates and zooplankton. It is occasionally kept in home aquariums due to its unique appearance and peaceful temperament.