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Science
Prehistoric Shark Gallery Tour the Ancient Seas Make Your Own Shark
The American Museum of Natural History
The Search for Ancient Sharks
Symmorium
Symmorium bears close similarity in size and appearance to Stethacanthus, but is missing the "spine and brush" on its back. Some scientists think that the two forms are simply the males and females of related species, while other scientists think they were different groups.

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Symmorium


 
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