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Saturday, December 3, 2016

In two oceans discovered the remains of an ancient giant shark


A new species of the extinct sharks was opened by the experts from De Paul University in Chicago, compared found at various points in the Pacific and Atlantic ocean, the teeth of the ancient predators. The researchers examined the teeth found on the coasts of California, North Carolina, Japan and Peru.

The discovery suggests that 20 million years ago the earth’s oceans was a very dangerous place — it was then it sailed for the many sharks the size of a car. The new species was named Megalolamna paradoxodon. “Paradox” is that in some sense, the discovery leaves more questions than it answers. Extinct sharks, apparently, are “relatives” even more ancient Megalodon, but they are separated by 45 million years of evolution, to trace which is not yet possible. Experts are unable to determine how long the discovered type existed on Earth. However a rough estimate scientists — rather, there is evidence of a shark not earlier than 23 million years ago and disappeared about 20 million years after that.

Scientists are also surprised that such a large marine predators that lived in such a vast space, until recently, nothing was known. According to the researchers, it makes you wonder about how little people today know about the marine fauna of the distant past.

Having studied five teeth, the length of each of which is approximately five centimeters, the scientists suggested that Megalolamna paradoxodon reached an average 3.7 metres in length is quite modest compared to the 18-metre-long Megalodon, but enough to eat the fish of medium size. Their teeth were very well adapted for seizing prey, and in order to cut it.

On the results, the scientists said in the journal Historical Biology.

source

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