2015年10月29日星期四

New shark fossils found in Texas break the fossil record

Before then, giant sharks had been recovered from rock dating back 130 million years - it is during the age of the dinosaurs.The largest shark that ever existed is much younger, occurring at about 15 million years ago. It is commonly called "Megalodon". However, the new fossils from Texas show that giant sharks go further back into the fossil record. After careful study, a team led by Dr. John Maisey of the American Museum of Natural History in New York finally could estimate the size of the entire sharks by comparing them with smaller and more complete fossils of related sharks. The results impressed the researchers. They estimated for the two Texas supersharks and targeted the size between 18 and 26 feet in length (5.5 to 8 meters). The largest of these specimens was twenty-five percent larger than today's largest predatory shark, which is the Great White. Although the fossil sharks from Texas are not nearly as large as Megalodon, which might have reached up to 67 feet in length (about 20 meters), they might have been the biggest sharks in the ocean by far. The fossil braincases are supposed to belong an extinct species of shark which is called Glikmanius occidentalis, or they may be a new and larger related species which is unknown by scientist till now. Closely related sharks are known from as far off as Scotland, suggesting that this group of sharks can disperse over great distance. The fossils are nearly 300 million years ago. Maisey and his team presented the results of the Texas 'supershark' at the annual meeting for the Society of Vertebrate Paleontology in Dallas, Texas. You may like this>>>http://www.cusabio.com/Polyclonal-Antibody/ST3GAL2-Antibody-11098180.html

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