Trilobites are a large group of marine invertebrates that went extinct 245 million years ago – long before the extinction event that wiped out the dinosaurs. Trilobites belonged to the largest phylum of animals in the world, the Arthropoda – which also includes insects, spiders, and crustaceans. However, though they looked vaguely like a sort of shrimp or lobster, trilobites made up their own distinct group of arthropods, and were not closely related to any living species. Because of their hard shells, trilobites fossilized easily and are rather common fossils in some parts of the world.
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