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Pseudochromis marshallensis, commonly known as the Marshall Island Dottyback, is a species of marine fish in the family Pseudochromidae. It is found in the western Pacific Ocean, specifically in the Marshall Islands.
The Marshall Island Dottyback has a distinctive appearance, with a deep purple-black body and bright white spots on its fins and body. It has a relatively small size, growing to a maximum length of around 7 cm.
This species is typically found in coral reefs and is known to be territorial, preying on small invertebrates and fish. It is occasionally kept in aquariums due to its striking appearance but is rare.