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Chris Petrone, NOAA’s Delaware Sea Grant in Lewes, DE About 20 million years ago, the horseshoe crab, as we know it today, evolved. Members of Family Limulidae, which include four extant species of horseshoe crabs, have relatives—the trilobites—that existed on Earth over 500 million years ago! In North America, just one species of horseshoe crabs…

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