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Mosasaur tooth 25-35mm
This group of animals belongs to the phylum of Echinodermata (echinoderms), a group that also includes sea urchins. They were round, spherical in shape and were attached to the bottom of the sea with a stalk. The first fossils of these animals are known from the Ordovician era. They became extinct during the Devonian.
Photos or locations for Cystoide on the site
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