Blackwell Publishing
Precambrian Paleozoic Mesozoic Cainozoic
Cambrian 590 MYRBP Ordovician 438 MYRBP Silurian 438 MYRBP Devonian 408 MYRBP Carboniferous 360 MYRBP Permian 286 MYRBP

One of the most famous early predators was Dimetrodon, which appeared in the Early Permian. It had fearsome jaws and teeth, and a puzzling "sail" running down its back. Some people have suggested that Dimetrodon used it to sail across water, but most authors now think that it may have acted as a radiator, adjusting the animals body temperature.

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