Fossil reveals a 310-million-year-old fish that ate with a hidden second jaw

ScienceDaily
Sep 4, 2025, 2:52 am107 pts
Scientists uncovered a 310-million-year-old fish fossil with a “tongue bite,” teeth on the roof and floor of its mouth that worked like a second jaw. This adaptation, previously thought to have appeared much later, shows how fish rapidly experimented with new feeding strategies after mass extinction.

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