Tetrasomus gibbosus
Encyclopedia
Tetrosomus gibbosus , the Humpback Turretfish, is a Boxfish
Boxfish
Ostraciidae is a family of squared, bony fish belonging to the order Tetraodontiformes, closely related to the pufferfishes and filefishes. Fish in the family are known variously as boxfishes, cofferfishes, cowfishes and trunkfishes...

 from the Indo-West Pacific. It occasionally makes its way into the aquarium trade. It grows to a size of 30 centimeter in length.
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