Evidence On Prehistoric Sharks Essay

1269 words - 5 pages

Evidence on Prehistoric Sharks

One of the previous papers in English class required the class to pick a paper to explore, this question will be concentrated on further in the synthesis essay. What evidence do scientist have to prove that prehistoric sharks existed? The reason behind picking this question wasn’t just to find proof that these monsters swam the seas, but to learn more about them from different resources. One of the resources that were used was a chapter in Angelo Mojetta’s book Sharks, called “ The Birth Of A Legend”. The other resource that was used for information was an article in Discovery Channels website called “ Prehistoric Sharks”. Sharks and Discovery Channel are the two resources that led to many other questions about their different, and similar views on prehistoric sharks existence.
Mojetta wrote about prehistoric sharks, and the history of these creatures. According to Angelo Mojetta, author of Sharks, Cladoselache genus, one of the first prehistoric sharks, was buried in sediment that kept it preserved. Unlike other sharks, Cladoselache genus had a circle of tiny plates around it’s eyes for protection against it’s victim’s attempts to fight back. These sharks lived over 400 million years ago. Sharks of the past could mostly be identified by their teeth, because shark’s bodies are made of cartilage. Another shark that was focused on was called, Stethacanthus. This shark had a very unique look. Stethacanthus had a brush like decoration on the top of it’s head, and an extra fin like part that had the same bristle like decorations on it. These characteristics were thought to be used as suction cups, to hitch rides from larger fish. One of the most famous sharks that looks like an oversized Great White shark, is Carcharodon megalodon. These beast teeth are compared to the teeth of a Tyrannosaurus rex. Fossils, teeth and spines have been discovered all over the world, leaving proof that prehistoric sharks roamed the seas millions of years ago.
Mojetta and Discovery Channel both have information about prehistoric shark’s history, but they don’t focus on the same species of sharks. Discovery Channel, “Prehistoric Sharks” believes, that Helicoprion, Echinochimaera, Orthacanthus, Symmorium, Belantsea and Scapanorhychus were interesting sharks to mention, due to their odd like appearances(3). Mojetta mentioned these sharks, but focused mainly on the earlier species of sharks, Cladoselache genus and Stethacathus. These resources explored different prehistoric sharks, giving more incite to these creatures.
Despite Mojetta ands Discovery Channel’s different strategies on introducing shark species, they both have an abundance of similar information on what’s thought to be the largest shark to ever exist. Mojetta wrote about this mammoth shark called Carchardon megalodon, describing this creature as having Tyrannosaurus rex sized teeth, and being the size of a sperm whale( 26). Discovery Channel...

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