Original: The Lamniformes contains the extinct Megalodon ( Carcharodon megalodon ) , which like most extinct sharks is only known by the teeth ( the only bone found in these cartilaginous fishes , and therefore are often the only fossils produced ) and a few vertebrae .
Simplified: The Lamniformes contains the extinct Megalodon ( Carcharodon megalodon ) , which like most extinct sharks is only known by the teeth ( the only bone found in these cartilaginous fishes , and therefore are often the only fossils produced ) .