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NECTRIDEA

The diplocaulus is the amphibians which inhabited a river and the marsh of the Southwestern U.S. between Aser period and Kunguru period (from 290,000,000 years to 256,100,000 years before) in the first half of the Permiana. As a lot of fossils are discovered from a larva to a mature form so far and grow up, a head projects into right and left steadily, and the process when it is it in boomerang form becomes clear. Limbs are extremely poor, and it is difficult to raise this huge head, and to walk and can suppose it when there was not action ability in the land almost.

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