Megalodon: why so much of its story comes from teeth
Megalodon was a giant shark known especially from its teeth. Some are large enough to fill much of a person's hand. Their hard surfaces survive well as fossils. The rest of the animal had a different chance of preservation. Like other sharks, it had a skeleton made mainly from cartilage. Teeth and the rest of a skeleton do not have equal chances of becoming fossils. Burial, decay and later damage affect them differently. A record full of teeth can therefore leave much of the body unknown. [1] [2]
Hard teeth, softer skeleton
Cartilage is less likely than teeth to survive in the fossil record. Some fossil vertebrae are known, but complete bodies are missing. Sharks also replace teeth throughout their lives. That creates many chances for a tooth to enter the sediment. One animal can therefore leave more than one tooth behind. Losing a tooth is not the same as losing the animal. A shed tooth can be buried while its owner continues living. This helps explain why counting teeth does not directly count sharks. [1] [2]
Rebuilding a missing body
Scientists use those remains to estimate body size. The result depends partly on comparisons with other sharks. Its exact outline is harder to recover than a single tooth's shape. Megalodon should not automatically be treated as an enlarged great white. Researchers continue to debate how the whole body was proportioned. A tooth's height can be measured directly. Turning that height into a body length requires a rule based on comparison. Different rules can produce different answers from the same tooth. [1] [2]
An extinct ocean predator
The fossil evidence places its extinction around three and a half million years ago. There is no scientific evidence for a living population today. Finding an old tooth on a beach does not change that. Fossils can be washed out of rocks long after the animal died. The tooth records an ancient ocean rather than a hidden modern shark. An object can have more than one journey before someone finds it. A tooth may first be buried, then exposed by erosion, then moved by waves. The date of its discovery tells us nothing by itself about when the shark lived. [1] [2]