The Grampy Shark Birthday from Grandchildren Grampy Shirt Megalodon was the greatest predatory shark to ever live, and its juveniles were also very large; when born, they were about the size of a normal basketball player.
How did the fiery baby megalodons promote their impressive embryonic development? They may have devoured their younger siblings while in the womb, a survival strategy shared by some modern sharks.
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Researchers recently calculated the Grampy Shark Birthday from Grandchildren Grampy Shirt size of the offspring by analyzing the bone fossils of an adult Otodus megalodon about 30 feet (9 meters) long when it died (these monster sharks can be long about 66 feet, or 20 m). The scientists then looked at the “growth rings” in the sharks’ preserved skeleton fragments, similar to the rings in the trunk used to determine the age of plants.
Megalodon – and all sharks, glides and rays – belong to a class of fish called Chondrichthyes, whose skeletons are made of cartilage, not hard bones. Hence, extinct cartilaginous fish species such as megalodon and other megatooth sharks are known mainly for their teeth, which are made from calcium and thus persist in the fossil record longer than the cartilage skeleton. fragility of these fishes.
But for the new study, published online Jan. 11 in the Grampy Shark Birthday from Grandchildren Grampy Shirt journal Biological History, the authors examined a rare collection of 150 megalodon vertebrae with mineralized cartilage, “column The only reasonably preserved living species of the species worldwide, “they wrote.
Using a computerized X-ray (CT) scan, the scientists counted 46 equally spaced growth rings in three of the megalodon vertebrae. They then applied a mathematical growth curve equation commonly used to calculate growth patterns in modern sharks, based on growth bands in their spinal cartilage, Kenshu Shimada, spear paleontologist at DePaul University in Chicago and research associate at the Sternberg Museum said in Kansas.