Cameroceras

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===This squid like creature was one of the biggest animals to live in the Paleozoic era. Scientists believed that this creature's shell was up to 30 feet long. This creature was a genus of giant orthocone cephalapod that lived in the Ordovician period. Scientists think it was largely blind, having large, yet feeble eyes like those of what may be its closest living relative, Nautilus. ===

Lived around 470 to 440 million years ago  10-11 meters long with a 9-10 inch shell. It was a carnivore.