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There are several candidates for the oldest living animal species. The tadpole shrimp, Triops cancriformis, is believed to have existed since at least 220 million years ago, and possibly as much as 300 million. Queensland lungfish, Neoceratodus forsteri, fossils have been found dating back 100 million years. Although probably not existing as a single species, horseshoe crabs have been found dating back over 400 million years.

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