#order_Xiphosura__Xiphosura  horseshoe crabs and extinct forms
  supertype:  animal_order  the order of animals
  member:  family_Limulidae
  member of:  class_Merostomata__Merostomata  used in some classifications; includes the orders Xiphosura and Eurypterida
     member of:  superclass_Chelicerata__Chelicerata  spiders; scorpions; horseshoe crabs
        member of:  phylum_Arthropoda__Arthropoda  jointed-foot invertebrates: arachnids; crustaceans; insects; millipedes; centipedes
           member of:  kingdom_Animalia__Animalia__animal_kingdom  taxonomic kingdom comprising all living or extinct animals

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