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Limulus polyphemus (Chelicerata: Xiphosura: Limulidae)

Atlantic horseshoe crab

Credit: Didier Descouens

The Atlantic horseshoe crab, Limulus polyphemus, is a marine chelicerate arthropod. It is most commonly found in the Gulf of Mexico and along the northern Atlantic coast of North America, with Delaware Bay a main area of annual migration.