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Prehistoric pins

作者:卢攀猝    发布时间:2019-03-07 09:02:14    

By Jeff Hecht A FOSSIL snake with well-developed rear limbs has fired the debate over whether snakes’ ancestors lived on land or in the sea. The 95-million-year-old Haasiophis terrasanctus was found in marine deposits north of Jerusalem. In 1996, researchers who studied a similar legged snake called Pachyrhachis decided that it was an ancestral snake that had never lost its rear legs. As Pachyrhachis was a sea predator, they concluded that it—and all snakes—had evolved from marine lizards called mosasaurs (New Scientist, 30 November 1996,

 

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