#order_Xiphosura__Xiphosura  horseshoe crabs and extinct forms
  supertype:  animal_order  the order of animals
  member of:  class_Merostomata
  member:  family_Limulidae__Limulidae  horseshoe crabs
     member:  genus_Limulus__Limulus  type genus of the family Limulidae
        member:  horseshoe_crab__horseshoecrab__king_crab__Limulus_polyphemus__Xiphosurus_polyphemus  large marine arthropod of the American Atlantic coast having a domed horseshoe-shaped carapace and stiff pointed tail; a living fossil related to the wood louse
     member:  genus_Tachypleus__Tachypleus  a genus of Limulidae
        member:  Asian_horseshoe_crab  horseshoe crab of the coast of eastern Asia

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