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Study Confirms Teeth Originated as Sensory Structures in Ancient Fish Armor

  • On May 21, 2025, researchers at the University of Chicago revealed that teeth originally developed as sensory structures embedded in the protective skin of early vertebrates living approximately 465 million years in the past.
  • This finding follows a detailed analysis of fossil specimens using advanced CT and synchrotron scans that clarified previous confusion about early vertebrates and invertebrates.
  • The study showed that structures called odontodes, which contained dentine and nerves, initially served to detect water conditions rather than for chewing or defense.
  • Lead author Yara Haridy explained that teeth can function as sensory organs even when located outside the mouth, while senior author Neil Shubin emphasized that detecting characteristics of the surrounding water was crucial for survival in a challenging predatory environment.
  • These insights suggest that sensory tissue preceded oral teeth, refining the timeline of vertebrate evolution and supporting the theory that teeth evolved from external sensory structures.
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Nature broke the news in United Kingdom on Wednesday, May 21, 2025.
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