Megalodon (meg-a-lo-don) was a giant shark that lived in prehistoric times during the Neogene period.  Fossil evidence had revealed that megalodon fed upon large marine animals.  A  Swiss naturalist, Louis Agassiz, gave this shark its scientific name, Carcharodon megalodon in 1835.  While the scientific name is Carcharoden, it is often informally dubbed the megatooth or the giant white shark or even monster shark.  The most common fossils of Carcharoden megalodon are its teeth.  The teeth are morphologically simaler to great white shark teeth but are more robust.