genus Limulus
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| Noun | 1. |  genus Limulus - type genus of the family Limulidae arthropod genus - a genus of arthropods family Limulidae, Limulidae - horseshoe crabs horseshoe crab, Limulus polyphemus, Xiphosurus polyphemus, king crab - 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 |