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Muddy tetrapod origins

The tracks left by organisms are among the most difficult of fossils to interpret. But just such evidence puts debate about the origins of four-limbed vertebrates (which include ourselves) on a changed footing.

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Figure 1: Simplified evolutionary tree of the living and fossil lobe-finned fishes and tetrapods.


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Janvier, P., Clément, G. Muddy tetrapod origins. Nature 463, 40–41 (2010).

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