The researchers’ findings showed that most of the sharks in the Mesozoic were relatively small, with only four genera containing members exceeding 6 m in length. The largest species actually identified is the giant shark Otodus megalodon. According to estimates of the researchers, this species reached a length of at least 15 meters, comparable to the world’s largest fish today, the whale shark.
Although the megalodon size in modern science makes this finding not surprising, the giant size of this species is unusual given that all organisms at the same time were of a size. ruler by half. It is not clear exactly how the megalodon was able to significantly lead the race ahead, although thermogenesis (hot blood) is a hypothesis that has been proposed in the past. However, the scientists in this study have a different idea.
Species of the Mackerel Order are still alive today, including sand tiger, dam fish, basking fish, mako and great white shark. Many of them can grow to gigantic sizes. All of these sharks exhibit a spawning strategy in which many of the eggs hatch inside the shark and develop inside the mother fish, like human twins.
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