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Kenshu Shimada, professor of paleobiology in the College of Science and Health, holds a fossilized tooth of megalolamna paradoxodon, a new species of extinct shark that he and his international research team describe in their study published in the international scientific journal Historical Biology. Shimada and his team based their discovery on the shark’s large fossilized teeth, some up to 4.5 centimeters (1.8 inches) long, found in the eastern and western United States (California and North Carolina), Peru and Japan. The shark lived during the early Miocene epoch about 20 million years ago and belongs to a shark group called Lamniformes, which include the modern-day great white and mako sharks. (DePaul University/Jeff Carrion)