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A new study discovered male ghost sharks grow teeth out of their foreheads on an appendage called a tenaculum

The Washington-based study "flips the long-standing assumption in evolutionary biology that teeth are strictly oral structures," says one of the study's researchers

The male ghost sharks use these teeth to grip a female mate during sex

Ghost sharks are lurking off the coast of Washington.

Also known as ratfish or chimaeras, ghost sharks are deep-sea fish characterized by their green, glowing eyes and shimmering bodies, typically measuring around two feet in length.

A new study has revealed another odd feature of these cartilaginous fish, which have been found swimming in the waters near San Juan Island in Puget Sound: forehead teeth.

According to The New York

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