How does the ratfish hold on during sex? With its forehead teeth, of course

A brown, almost translucent fish with big yellow eyes, white spots and a small white lump on its forehead.

The male ratfish has a unique, club-shaped appendage on its forehead, called a tenaculum, which it uses to cling to the female’s pectoral fin while mating. It turns out, those appendages are chock full of rows upon rows of shark-like teeth.

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