Source: Francesc Roig Toqués.
This tooth measures 11 cm. and it is an example of a tooth from the Carcharodon Megalodon from Florida, the United States.
The Carcharadon Megalodon is an extinct species of shark, that was very large and lived between about 19.8 and 2.6 million years ago, during the Cenozoic Era. The Swiss naturalist, Louis Agassiz, gave this shark the name, Carcharodon megalodon, in 1835. It is commonly known as the big-toothed shark, giant white shark or even the monster shark.
The most commonly found fossils from this megalodon are its teeth, which could reach up to 18cm. Currently, many experts agree that this giant shark could have measured up to 16 metres long.