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Scientists discovered true teeth growing on the head of the spotted ratfish, a distant shark relative. The toothed structure, called a tenaculum, helps males hold onto females during mating. Genetic evidence shows these head teeth share the same origins as oral teeth, overturning assumptions that teeth only evolve in jaws. This discovery reshapes the story of dental evolution across vertebrates.

Source: https://www.sciencedaily.com/releases/2 ... 231009.htm