Megatoothed shark is praised by many paleontologists as the most powerful creature in the history of the earth. Scientists speculate that the maximum bite force is about 20 tons, and the oral bite force even exceeds that of Tyrannosaurus Rex, which can easily crush the ribs of whales.
According to foreign media reports, a new study by William Patterson University in the United States points out that,
Megatoothed sharks lived from the late Miocene 15 million years ago to the early Pleistocene 2.6 million years ago,It is not only the top predator in the ocean, but also one of the largest predators ever, and the largest fish.
Because sharks are cartilaginous fishes, it is difficult to leave fossils in general bones, and megatoothed sharks are no exception. Because sharks constantly change their teeth throughout their lives, most of the research on megatoothed sharks is based on their fossilized teeth.
The researchers say that as the sharks grow, deposits like tree rings appear on their spines. So the scientists picked 15 vertebrae from the same shark and scanned them with X-ray computed tomography.
It was found that the shark was about 46 years old and about 9 meters long when it died.Through further observation of the angle transformation of the growth ring of the largest vertebrae, it was found that the length of its birth was about 2 meters long.
It can be inferred that megatoothed sharks, like mackerel, long tail and great white sharks, belong to viviparous. The reason why they are so big at birth is that they are likely to begin to devour their unborn siblings in their mother's womb to grow.
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