Discription Slide 9-16

SharkKnights Lecture Discription

Tyrannus = Tyrant; sauros = lizard; rex = king. T. rex was the most feared predator (an animal that hunts other animals) ever. This animal could remove over 200kg of flesh with one bite.

SharkKnights Lecture Discription

Over 12m long, with a weight of 7 tons. The post powerful predator ever. Even with his tiny arms it could lift 200 kg which is about 3-4 times more than a person can.

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The “T. rex of the ocean” was “Megalodon,” a shark that was at least 15m long with a weight of 50 tons.

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Length relationship between, Megalodon, whale shark and white shark. The largest white shark ever caught was 7.3m long and weighted about 3.5 tons.

SharkKnights Lecture Discription

There are a lot of fossil teeth around. On average, a shark produces between 20,000 and 30,000 teeth throughout its life. The tooth of a Megalodon (seen here) is fossilized. Fossilized teeth are brown or black. When alive, Megalodon teeth were white as well.

SharkKnights Lecture Discription

In comparison: tooth of a white sharks. These triangular teeth are made for biting into larger prey and remove a portion through a head-shaking motion (sawing). Both species fed and feed on marine mammals.

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Fossil teeth are mostly found on land, due to the change of the oceans over time.

SharkKnights Lecture Discription

Fossil of a shark. Such findings are rather rare, mostly only teeth are found. Although the form seen here resembles a bony fish, it clearly shows jaws and other bodily structure identifying it as a shark and not a bony fish.