Q: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
CHICAGO, Oct. 3 (UPI) -- Analysis of ancient shark teeth, collected in Japan, Peru and the United States, has yielded a new extinct shark species named Megalolamna paradoxodon. Scientists described the species in a new study, published this week in the journal Historical Biology. 
  
 The new species belongs to the family of extinct sharks known as Otodontidae, a group that includes the famed megalodon. The teeth of Megalolamna paradoxodon recall those of other Otodontidae species, but they also resemble an enlarged version of the teeth of modern salmon shark from the genus Lamna. 
  
 For this reason, scientists were forced to create a new genus, Megalolamna, under which to classify the novel species. 
  
 The largest Megalolamna teeth measure roughly 1.8 inches in length, suggesting the ancient shark was the equivalent of a modern great white -- approximately 13 feet long. The species boasted grasping teeth in the front of its mouth and slicing teeth in the back. 
  
 "It's quite remarkable that such a large lamniform shark with such a global distribution had evaded recognition until now, especially because there are numerous Miocene localities where fossil shark teeth are well sampled," Kenshu Shimada, a paleobiologist at DePaul University, said in a news release. 
  
 In addition to carving out a new genus for the species, researchers also reclassified the megatoothed lineage, moving megalodon and its closest relatives from their traditional genus of Carcharocles to a new home under the Otodus umbrella. 
  
 "The idea that megalodon and its close allies should be placed in Otodus is not new, but our study is the first of its kind that logically demonstrates the taxonomic proposition," Shimada explained. ||||| Megalolamna paradoxodon is the name of a new extinct shark described by an international research team who based their discovery on fossilized teeth up to 4.5 centimeters (1.8 inches) tall found from the eastern and western United States (California and North Carolina), Peru and Japan. 
  
 The newly identified fossil shark lived during the early Miocene epoch about 20 million years ago and belongs to a shark group called Lamniformes, which includes the modern-day great white and mako sharks. 
  
 More specifically, it belongs to Otodontidae, which contains the iconic extinct superpredator 'megalodon' or the 'megatoothed' shark, and as an otodontid, Megalolamna paradoxodon represents a close cousin of the megatoothed lineage, said Kenshu Shimada, a paleobiologist at DePaul University and research associate at the Sternberg Museum in Kansas. 
  
 Certain dental features suggest its otodontid affinity, but in many other aspects, teeth of the new fossil shark look superficially like over-sized teeth of the modern-day salmon shark that belongs to the genus Lamna -- hence the new genus Megalolamna, the researchers noted. The new species name 'paradoxodon,' or paradoxical teeth, comes from the fact that the shark appears to emerge suddenly in the geologic record with a yet unresolved nearly 45-million-year gap from when Megalolamna possibly split from its closest relative Otodus. 
  
 Although smaller than members of the megatoothed lineage containing 'megalodon' that reached well over 10 meters (33 feet), Megalolamna paradoxodon is still an impressive shark estimated to be minimally equivalent to the size of a typical modern-day great white, roughly 4 meters (13 feet) in length. Living in the same ancient oceans megatoothed sharks inhabited, Megalolamna paradoxodon had grasping-type front teeth and cutting-type rear teeth likely used to seize and slice medium-sized fish. 
  
 "It's quite remarkable that such a large lamniform shark with such a global distribution had evaded recognition until now, especially because there are numerous Miocene localities where fossil shark teeth are well sampled," said Shimada, lead author of the study. 
  
 In classifying the new fossil shark, the research team also came to a conclusion that members of the megatoothed lineage, including 'megalodon,' ought to be classified into the genus Otodus, and not to its traditional genus Carcharocles. 
  
 "The idea that megalodon and its close allies should be placed in Otodus is not new, but our study is the first of its kind that logically demonstrates the taxonomic proposition," Shimada noted. Because the megatoothed shark lineage simply represents a subset of Otodus, excluding megatoothed sharks would not reflect a full lineage for Otodus -- an uncomfortable taxonomic condition referred to as 'non-monophyletic.' The inclusion of megatoothed sharks into Otodus would make the genus a much preferred complete lineage referred to as a 'monophyletic group' that is considered to be a next of kin to the new genus Megalolamna. |||||
A:
It was all in the teeth. Scientists have identified an entirely new extinct shark based on the ancient species' chompers gathered in the US, Japan, and Peru, UPI reports. A study of the "elusive" sea swimmer published Monday in the Historical Biology journal describes the great white-like Megalolamna paradoxodon as likely having lived in shallow coastal waters and, based on its tooth size, averaged about 13 feet in length (though some may have grown as large as 24 feet). And Kenshu Shimada, the lead author of the study out of DePaul University, is calling it "remarkable that such a large lamniform shark with such a global distribution had evaded recognition until now," a press release notes. The teeth, which were up to 1.8 inches long, were found in California and North Carolina, as well as overseas. The shark lived about 20 million years ago during the Miocene era, scientists believe. And because its teeth—which consisted of "grasping" teeth in the front and "slicing" teeth in the back—resembled not only those found on other Otodontidae sharks (of which the also-extinct megalodon shark was also a member), but also seemed to be larger versions of those of lamniform sharks (which include today's mako sharks and great whites), the scientists created an entirely new species just for this creature. Science Daily explains that's why "paradoxodon" is part of the shark's name, as its teeth are "paradoxical." The scientists' other taxonomical conclusion: the super-predator megalodon should be moved from the Carcharocles genus to the Otodus genus. (Whales blew up in size after the megalodon went extinct.)