Hypoplectrus nigricans
Encyclopedia
Hypoplectrus nigricans is a hamlet
Hamlet (fish)
A hamlet is a fish of the genus Hypoplectrus that is found mainly in coral reefs in the Caribbean Sea and the Gulf of Mexico, particularly around Florida and the Bahamas...

 from the Western Atlantic. It occasionally makes its way into the aquarium trade. It grows to a size of 15 cm in length.
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