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horseshoe crab, king crab, Limulus polyphemus, Xiphosurus polyphemus | large marine arthropod of the Atlantic coast of North America having a domed carapace that is shaped like a horseshoe and a stiff pointed tail; large marine arthropod of the Atlantic coast of North America having a domed carapace that is shaped like a horseshoe and a stiff pointed tail; a living fossil related to the wood louse ❲Limulus polyphemus❳ |