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University of Tennessee at Knoxville


The fish were biting in ancient Alabama

Scientists discovered a 4-meter-long Polycotylus fossil with a huge tooth embedded in its neck vertebrae, suggesting a violent attack by an enormous bony fish called Xiphactinus. The fossil's internal structure was analyzed using CT scanning, revealing a three-dimensional model of the tooth and its attacker.

SourceUniversity of Tennessee at Knoxville·JournalJournal of Vertebrate Paleontology·DateMar 13, 2026