Primitive Fish Fossils Reveal Developmental Origins of Teeth
Published:16 Dec.2020    Source:eLife

These findings in ancient fish fossils contradict established claims about the difference between the two structures based on modern sharks, and provide potential new insights into the origins and development of teeth.

Odontodes are hard structures made of dentine, the main substance in ivory, and are found on the outside surfaces of animals with backbones (vertebrates). Teeth are an example of odontodes but some animals also have them on their skin, such as the tooth-like 'scales' of sharks. These are known as dermal odontodes.