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Horn teeth(Ceratodontes) are structures in the oral cavity made of horn substance, which functionally serve as teeth. In contrast to bone teeth, they are formed by keratinization from the epithelium of the oral mucosa.

They occur in several forms:

  • Conical horn-teeth are found with round-mouths.
  • Plate-shaped horn teeth occur in some mammals that have lost their bony teeth. For example, they are found in platypuses, manatees and baleen whales.
  • Horn sheaths(rhamphotheca), which cover the jaw bones, occur in Anomodontia, turtles, and birds (→ beak).


  • Ernst Haeckel: Systematic Phylogeny of Vertebrates: Part Three, 1896, pp. 142-143.