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Horn corals flourished during the Paleozoic Era and belong to the phylum called cnidaria. As you may have guessed, they are related to jellyfish as well as modern day corals. There were so many horn corals in the oceans of the Paleozoic world that they created large reefs, still found in many places.
They are from the extinct order of corals called Rugosa which means wrinkled. The outside of these corals have a wrinkled appearance and grow in a long cone shape like a bull's horn. The fossil is the skeleton of the coral animal or polyp but the animal lived at the top of the cone. They had many tentacles sticking out to gather food which gave the horn coral a flower like appearance. All of the order Rugosa went extinct during the Great Permian Extinction about 252 million years ago.
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