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The Search for Ancient Sharks
Cladoselache
One of the best known early sharks, 3-foot-longCladoselachehunted in the warm seas of North America 375 million years ago. It had a markedly weaker jaw joint than present-day sharks, but it compensated with impressive jaw-closing muscles that are frequently fossilized.Caldoselachehad a deep, forked tail and was probably a fast swimmer, which is just as well since it may have been preyed upon by the giant 15-foot armored fish known asDunkleosteus.

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Cladoselache


 
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