The Tully Monster
Nobody knows what the Tully Monster was. Consequently it is the State Fossil of Illinois, the state in which it was discovered by Francis Tully in the 1950's. It lived about 300m years ago.
Is it a vertebrate or an invertebrate? The answer may lie in its (very odd) eyes! Did you know that there was zinc and copper in eyes and their ratio differs between creatures with backbones and those without.
You can read all about it in THIS ARTICLE. The reconstructions certainly look odd!
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