Could teeth really have come from body scales?
You may not know this, but there has been a long standing-debate over how teeth evolved. Indeed, paleontologists may have come a long way in their scientific advancements though no one yet knowsNow, vertebrate paleontologist Todd Cook, associate professor of biology, Penn State Behrend, may have stumbled on the answer to this question while studying the tissue structure of rostral denticles.
“Yet, very little was known about the organization of the tissues that make up rostral denticles, particularly the hard outermost layer known as enameloid. Given that rostral denticles are likely specialized body scales, we hypothesized that the enameloid of rostral denticles would exhibit a similar structure to the enameloid of body scales, which have simple microcrystal organization.
Cook further explained: “This finding provides direct evidence supporting the ‘outside-in’ hypothesis, as it shows that scales have the capacity to evolve a complex tooth-like enameloid outside of the mouth. It is more parsimonious to suggest that scales produced a similar bundled microstructure in teeth and rostral denticles than to conclude that both these structures evolved a similar enameloid independently.
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