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Spotted Ratfish: Teeth Forming Outside Jaw Challenges Evolutionary Norms

9/7/2025

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Summary

Story summary

Researchers found that the spotted ratfish develops teeth on the tenaculum, challenging traditional tooth formation views.
These protrusions are confirmed as true teeth, marking the first instance of teeth forming outside the jaw.
Led by Karly Cohen, the study used micro-CT scans and tissue samples from Puget Sound ratfish.
The dental lamina in the tenaculum confirms the teeth's identity, showcasing evolutionary flexibility in tooth development.
Published in the Proceedings of the National Academy of Sciences, this research enhances understanding of dental evolution.

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Story summary

Researchers found that the spotted ratfish develops teeth on the tenaculum, challenging traditional tooth formation views.
These protrusions are confirmed as true teeth, marking the first instance of teeth forming outside the jaw.
Led by Karly Cohen, the study used micro-CT scans and tissue samples from Puget Sound ratfish.
The dental lamina in the tenaculum confirms the teeth's identity, showcasing evolutionary flexibility in tooth development.
Published in the Proceedings of the National Academy of Sciences, this research enhances understanding of dental evolution.