Why Sharks Are Covered In Teeth

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Dermal denticles: also called placoid scales, they’re the most primitive form of fish scales that are structurally similar to teeth and are today found only in sharks, rays, and chimaeras.

Outside-in theory: The strongest theory for the evolution of teeth, which are thought to have evolved from dermal denticle scales.

Ostracoderms: Extinct armored jawless fish that lived in the Paleozoic Era

Thelodonts: Extinct jawless fish that had individual scales as opposed to plates of armor

Placoderms: Now extinct, they were some of the first jawed fish and lived from the Silurian through the Devonian era.

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