Agonus Cataphractus, also known as the armored sea robin, is a unique fish species that resides in shallow waters of the North Atlantic. With its spiny body and armored plates, it is a fearsome sight to behold. Although its scientific name is well-known among marine biologists, there are several synonyms used to describe this species. These include the armed bullhead, thornyhead, and armorhead. These synonyms are often used interchangeably, depending on the region or culture discussing the fish. Regardless of its name, the Agonus Cataphractus is a fascinating creature that has adapted to survive in harsh underwater environments.