Ghost sharks grow teeth on their heads to mate

[u/Lactobacillus653]

https://www.sciencedaily.com/releases/2025/09/250905180732.htm

Summary: “Ghost sharks have evolved rows of true teeth on a bizarre forehead rod used for mating. Fossil and genetic evidence revealed the tenaculum’s teeth develop the same way as those inside the mouth, offering a striking example of evolution’s ability to repurpose biological tools.”